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-rw-r--r--vendor/secp256k1/include/secp256k1/secp256k1.h909
-rw-r--r--vendor/secp256k1/include/secp256k1/secp256k1_ecdh.h63
-rw-r--r--vendor/secp256k1/include/secp256k1/secp256k1_extrakeys.h247
-rw-r--r--vendor/secp256k1/include/secp256k1/secp256k1_schnorrsig.h190
4 files changed, 1409 insertions, 0 deletions
diff --git a/vendor/secp256k1/include/secp256k1/secp256k1.h b/vendor/secp256k1/include/secp256k1/secp256k1.h
new file mode 100644
index 0000000..f4053f2
--- /dev/null
+++ b/vendor/secp256k1/include/secp256k1/secp256k1.h
@@ -0,0 +1,909 @@
+#ifndef SECP256K1_H
+#define SECP256K1_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>
+
+/** Unless explicitly stated all pointer arguments must not be NULL.
+ *
+ * The following rules specify the order of arguments in API calls:
+ *
+ * 1. Context pointers go first, followed by output arguments, combined
+ * output/input arguments, and finally input-only arguments.
+ * 2. Array lengths always immediately follow the argument whose length
+ * they describe, even if this violates rule 1.
+ * 3. Within the OUT/OUTIN/IN groups, pointers to data that is typically generated
+ * later go first. This means: signatures, public nonces, secret nonces,
+ * messages, public keys, secret keys, tweaks.
+ * 4. Arguments that are not data pointers go last, from more complex to less
+ * complex: function pointers, algorithm names, messages, void pointers,
+ * counts, flags, booleans.
+ * 5. Opaque data pointers follow the function pointer they are to be passed to.
+ */
+
+/** Opaque data structure that holds context information
+ *
+ * The primary purpose of context objects is to store randomization data for
+ * enhanced protection against side-channel leakage. This protection is only
+ * effective if the context is randomized after its creation. See
+ * secp256k1_context_create for creation of contexts and
+ * secp256k1_context_randomize for randomization.
+ *
+ * A secondary purpose of context objects is to store pointers to callback
+ * functions that the library will call when certain error states arise. See
+ * secp256k1_context_set_error_callback as well as
+ * secp256k1_context_set_illegal_callback for details. Future library versions
+ * may use context objects for additional purposes.
+ *
+ * A constructed context can safely be used from multiple threads
+ * simultaneously, but API calls that take a non-const pointer to a context
+ * need exclusive access to it. In particular this is the case for
+ * secp256k1_context_destroy, secp256k1_context_preallocated_destroy,
+ * and secp256k1_context_randomize.
+ *
+ * Regarding randomization, either do it once at creation time (in which case
+ * you do not need any locking for the other calls), or use a read-write lock.
+ */
+typedef struct secp256k1_context_struct secp256k1_context;
+
+/** Opaque data structure that holds rewritable "scratch space"
+ *
+ * The purpose of this structure is to replace dynamic memory allocations,
+ * because we target architectures where this may not be available. It is
+ * essentially a resizable (within specified parameters) block of bytes,
+ * which is initially created either by memory allocation or TODO as a pointer
+ * into some fixed rewritable space.
+ *
+ * Unlike the context object, this cannot safely be shared between threads
+ * without additional synchronization logic.
+ */
+typedef struct secp256k1_scratch_space_struct secp256k1_scratch_space;
+
+/** Opaque data structure that holds a parsed and valid public key.
+ *
+ * The exact representation of data inside is implementation defined and not
+ * guaranteed to be portable between different platforms or versions. It is
+ * however guaranteed to be 64 bytes in size, and can be safely copied/moved.
+ * If you need to convert to a format suitable for storage or transmission,
+ * use secp256k1_ec_pubkey_serialize and secp256k1_ec_pubkey_parse. To
+ * compare keys, use secp256k1_ec_pubkey_cmp.
+ */
+typedef struct {
+ unsigned char data[64];
+} secp256k1_pubkey;
+
+/** Opaque data structured that holds a parsed ECDSA signature.
+ *
+ * The exact representation of data inside is implementation defined and not
+ * guaranteed to be portable between different platforms or versions. It is
+ * however guaranteed to be 64 bytes in size, and can be safely copied/moved.
+ * If you need to convert to a format suitable for storage, transmission, or
+ * comparison, use the secp256k1_ecdsa_signature_serialize_* and
+ * secp256k1_ecdsa_signature_parse_* functions.
+ */
+typedef struct {
+ unsigned char data[64];
+} secp256k1_ecdsa_signature;
+
+/** A pointer to a function to deterministically generate a nonce.
+ *
+ * Returns: 1 if a nonce was successfully generated. 0 will cause signing to fail.
+ * Out: nonce32: pointer to a 32-byte array to be filled by the function.
+ * In: msg32: the 32-byte message hash being verified (will not be NULL)
+ * key32: pointer to a 32-byte secret key (will not be NULL)
+ * algo16: pointer to a 16-byte array describing the signature
+ * algorithm (will be NULL for ECDSA for compatibility).
+ * data: Arbitrary data pointer that is passed through.
+ * attempt: how many iterations we have tried to find a nonce.
+ * This will almost always be 0, but different attempt values
+ * are required to result in a different nonce.
+ *
+ * Except for test cases, this function should compute some cryptographic hash of
+ * the message, the algorithm, the key and the attempt.
+ */
+typedef int (*secp256k1_nonce_function)(
+ unsigned char *nonce32,
+ const unsigned char *msg32,
+ const unsigned char *key32,
+ const unsigned char *algo16,
+ void *data,
+ unsigned int attempt
+);
+
+# if !defined(SECP256K1_GNUC_PREREQ)
+# if defined(__GNUC__)&&defined(__GNUC_MINOR__)
+# define SECP256K1_GNUC_PREREQ(_maj,_min) \
+ ((__GNUC__<<16)+__GNUC_MINOR__>=((_maj)<<16)+(_min))
+# else
+# define SECP256K1_GNUC_PREREQ(_maj,_min) 0
+# endif
+# endif
+
+/* When this header is used at build-time the SECP256K1_BUILD define needs to be set
+ * to correctly setup export attributes and nullness checks. This is normally done
+ * by secp256k1.c but to guard against this header being included before secp256k1.c
+ * has had a chance to set the define (e.g. via test harnesses that just includes
+ * secp256k1.c) we set SECP256K1_NO_BUILD when this header is processed without the
+ * BUILD define so this condition can be caught.
+ */
+#ifndef SECP256K1_BUILD
+# define SECP256K1_NO_BUILD
+#endif
+
+/* Symbol visibility. */
+#if defined(_WIN32)
+ /* GCC for Windows (e.g., MinGW) accepts the __declspec syntax
+ * for MSVC compatibility. A __declspec declaration implies (but is not
+ * exactly equivalent to) __attribute__ ((visibility("default"))), and so we
+ * actually want __declspec even on GCC, see "Microsoft Windows Function
+ * Attributes" in the GCC manual and the recommendations in
+ * https://gcc.gnu.org/wiki/Visibility. */
+# if defined(SECP256K1_BUILD)
+# if defined(DLL_EXPORT) || defined(SECP256K1_DLL_EXPORT)
+ /* Building libsecp256k1 as a DLL.
+ * 1. If using Libtool, it defines DLL_EXPORT automatically.
+ * 2. In other cases, SECP256K1_DLL_EXPORT must be defined. */
+# define SECP256K1_API extern __declspec (dllexport)
+# endif
+ /* The user must define SECP256K1_STATIC when consuming libsecp256k1 as a static
+ * library on Windows. */
+# elif !defined(SECP256K1_STATIC)
+ /* Consuming libsecp256k1 as a DLL. */
+# define SECP256K1_API extern __declspec (dllimport)
+# endif
+#endif
+#ifndef SECP256K1_API
+# if defined(__GNUC__) && (__GNUC__ >= 4) && defined(SECP256K1_BUILD)
+ /* Building libsecp256k1 on non-Windows using GCC or compatible. */
+# define SECP256K1_API extern __attribute__ ((visibility ("default")))
+# else
+ /* All cases not captured above. */
+# define SECP256K1_API extern
+# endif
+#endif
+
+/* Warning attributes
+ * NONNULL is not used if SECP256K1_BUILD is set to avoid the compiler optimizing out
+ * some paranoid null checks. */
+# if defined(__GNUC__) && SECP256K1_GNUC_PREREQ(3, 4)
+# define SECP256K1_WARN_UNUSED_RESULT __attribute__ ((__warn_unused_result__))
+# else
+# define SECP256K1_WARN_UNUSED_RESULT
+# endif
+# if !defined(SECP256K1_BUILD) && defined(__GNUC__) && SECP256K1_GNUC_PREREQ(3, 4)
+# define SECP256K1_ARG_NONNULL(_x) __attribute__ ((__nonnull__(_x)))
+# else
+# define SECP256K1_ARG_NONNULL(_x)
+# endif
+
+/* Attribute for marking functions, types, and variables as deprecated */
+#if !defined(SECP256K1_BUILD) && defined(__has_attribute)
+# if __has_attribute(__deprecated__)
+# define SECP256K1_DEPRECATED(_msg) __attribute__ ((__deprecated__(_msg)))
+# else
+# define SECP256K1_DEPRECATED(_msg)
+# endif
+#else
+# define SECP256K1_DEPRECATED(_msg)
+#endif
+
+/* All flags' lower 8 bits indicate what they're for. Do not use directly. */
+#define SECP256K1_FLAGS_TYPE_MASK ((1 << 8) - 1)
+#define SECP256K1_FLAGS_TYPE_CONTEXT (1 << 0)
+#define SECP256K1_FLAGS_TYPE_COMPRESSION (1 << 1)
+/* The higher bits contain the actual data. Do not use directly. */
+#define SECP256K1_FLAGS_BIT_CONTEXT_VERIFY (1 << 8)
+#define SECP256K1_FLAGS_BIT_CONTEXT_SIGN (1 << 9)
+#define SECP256K1_FLAGS_BIT_CONTEXT_DECLASSIFY (1 << 10)
+#define SECP256K1_FLAGS_BIT_COMPRESSION (1 << 8)
+
+/** Context flags to pass to secp256k1_context_create, secp256k1_context_preallocated_size, and
+ * secp256k1_context_preallocated_create. */
+#define SECP256K1_CONTEXT_NONE (SECP256K1_FLAGS_TYPE_CONTEXT)
+
+/** Deprecated context flags. These flags are treated equivalent to SECP256K1_CONTEXT_NONE. */
+#define SECP256K1_CONTEXT_VERIFY (SECP256K1_FLAGS_TYPE_CONTEXT | SECP256K1_FLAGS_BIT_CONTEXT_VERIFY)
+#define SECP256K1_CONTEXT_SIGN (SECP256K1_FLAGS_TYPE_CONTEXT | SECP256K1_FLAGS_BIT_CONTEXT_SIGN)
+
+/* Testing flag. Do not use. */
+#define SECP256K1_CONTEXT_DECLASSIFY (SECP256K1_FLAGS_TYPE_CONTEXT | SECP256K1_FLAGS_BIT_CONTEXT_DECLASSIFY)
+
+/** Flag to pass to secp256k1_ec_pubkey_serialize. */
+#define SECP256K1_EC_COMPRESSED (SECP256K1_FLAGS_TYPE_COMPRESSION | SECP256K1_FLAGS_BIT_COMPRESSION)
+#define SECP256K1_EC_UNCOMPRESSED (SECP256K1_FLAGS_TYPE_COMPRESSION)
+
+/** Prefix byte used to tag various encoded curvepoints for specific purposes */
+#define SECP256K1_TAG_PUBKEY_EVEN 0x02
+#define SECP256K1_TAG_PUBKEY_ODD 0x03
+#define SECP256K1_TAG_PUBKEY_UNCOMPRESSED 0x04
+#define SECP256K1_TAG_PUBKEY_HYBRID_EVEN 0x06
+#define SECP256K1_TAG_PUBKEY_HYBRID_ODD 0x07
+
+/** A built-in constant secp256k1 context object with static storage duration, to be
+ * used in conjunction with secp256k1_selftest.
+ *
+ * This context object offers *only limited functionality* , i.e., it cannot be used
+ * for API functions that perform computations involving secret keys, e.g., signing
+ * and public key generation. If this restriction applies to a specific API function,
+ * it is mentioned in its documentation. See secp256k1_context_create if you need a
+ * full context object that supports all functionality offered by the library.
+ *
+ * It is highly recommended to call secp256k1_selftest before using this context.
+ */
+SECP256K1_API const secp256k1_context *secp256k1_context_static;
+
+/** Deprecated alias for secp256k1_context_static. */
+SECP256K1_API const secp256k1_context *secp256k1_context_no_precomp
+SECP256K1_DEPRECATED("Use secp256k1_context_static instead");
+
+/** Perform basic self tests (to be used in conjunction with secp256k1_context_static)
+ *
+ * This function performs self tests that detect some serious usage errors and
+ * similar conditions, e.g., when the library is compiled for the wrong endianness.
+ * This is a last resort measure to be used in production. The performed tests are
+ * very rudimentary and are not intended as a replacement for running the test
+ * binaries.
+ *
+ * It is highly recommended to call this before using secp256k1_context_static.
+ * It is not necessary to call this function before using a context created with
+ * secp256k1_context_create (or secp256k1_context_preallocated_create), which will
+ * take care of performing the self tests.
+ *
+ * If the tests fail, this function will call the default error handler to abort the
+ * program (see secp256k1_context_set_error_callback).
+ */
+SECP256K1_API void secp256k1_selftest(void);
+
+
+/** Create a secp256k1 context object (in dynamically allocated memory).
+ *
+ * This function uses malloc to allocate memory. It is guaranteed that malloc is
+ * called at most once for every call of this function. If you need to avoid dynamic
+ * memory allocation entirely, see secp256k1_context_static and the functions in
+ * secp256k1_preallocated.h.
+ *
+ * Returns: pointer to a newly created context object.
+ * In: flags: Always set to SECP256K1_CONTEXT_NONE (see below).
+ *
+ * The only valid non-deprecated flag in recent library versions is
+ * SECP256K1_CONTEXT_NONE, which will create a context sufficient for all functionality
+ * offered by the library. All other (deprecated) flags will be treated as equivalent
+ * to the SECP256K1_CONTEXT_NONE flag. Though the flags parameter primarily exists for
+ * historical reasons, future versions of the library may introduce new flags.
+ *
+ * If the context is intended to be used for API functions that perform computations
+ * involving secret keys, e.g., signing and public key generation, then it is highly
+ * recommended to call secp256k1_context_randomize on the context before calling
+ * those API functions. This will provide enhanced protection against side-channel
+ * leakage, see secp256k1_context_randomize for details.
+ *
+ * Do not create a new context object for each operation, as construction and
+ * randomization can take non-negligible time.
+ */
+SECP256K1_API secp256k1_context *secp256k1_context_create(
+ unsigned int flags
+) SECP256K1_WARN_UNUSED_RESULT;
+
+/** Copy a secp256k1 context object (into dynamically allocated memory).
+ *
+ * This function uses malloc to allocate memory. It is guaranteed that malloc is
+ * called at most once for every call of this function. If you need to avoid dynamic
+ * memory allocation entirely, see the functions in secp256k1_preallocated.h.
+ *
+ * Cloning secp256k1_context_static is not possible, and should not be emulated by
+ * the caller (e.g., using memcpy). Create a new context instead.
+ *
+ * Returns: pointer to a newly created context object.
+ * Args: ctx: pointer to a context to copy (not secp256k1_context_static).
+ */
+SECP256K1_API secp256k1_context *secp256k1_context_clone(
+ const secp256k1_context *ctx
+) SECP256K1_ARG_NONNULL(1) SECP256K1_WARN_UNUSED_RESULT;
+
+/** Destroy a secp256k1 context object (created in dynamically allocated memory).
+ *
+ * The context pointer may not be used afterwards.
+ *
+ * The context to destroy must have been created using secp256k1_context_create
+ * or secp256k1_context_clone. If the context has instead been created using
+ * secp256k1_context_preallocated_create or secp256k1_context_preallocated_clone, the
+ * behaviour is undefined. In that case, secp256k1_context_preallocated_destroy must
+ * be used instead.
+ *
+ * Args: ctx: pointer to a context to destroy, constructed using
+ * secp256k1_context_create or secp256k1_context_clone
+ * (i.e., not secp256k1_context_static).
+ */
+SECP256K1_API void secp256k1_context_destroy(
+ secp256k1_context *ctx
+) SECP256K1_ARG_NONNULL(1);
+
+/** Set a callback function to be called when an illegal argument is passed to
+ * an API call. It will only trigger for violations that are mentioned
+ * explicitly in the header.
+ *
+ * The philosophy is that these shouldn't be dealt with through a
+ * specific return value, as calling code should not have branches to deal with
+ * the case that this code itself is broken.
+ *
+ * On the other hand, during debug stage, one would want to be informed about
+ * such mistakes, and the default (crashing) may be inadvisable.
+ * When this callback is triggered, the API function called is guaranteed not
+ * to cause a crash, though its return value and output arguments are
+ * undefined.
+ *
+ * When this function has not been called (or called with fn==NULL), then the
+ * default handler will be used. The library provides a default handler which
+ * writes the message to stderr and calls abort. This default handler can be
+ * replaced at link time if the preprocessor macro
+ * USE_EXTERNAL_DEFAULT_CALLBACKS is defined, which is the case if the build
+ * has been configured with --enable-external-default-callbacks. Then the
+ * following two symbols must be provided to link against:
+ * - void secp256k1_default_illegal_callback_fn(const char *message, void *data);
+ * - void secp256k1_default_error_callback_fn(const char *message, void *data);
+ * The library can call these default handlers even before a proper callback data
+ * pointer could have been set using secp256k1_context_set_illegal_callback or
+ * secp256k1_context_set_error_callback, e.g., when the creation of a context
+ * fails. In this case, the corresponding default handler will be called with
+ * the data pointer argument set to NULL.
+ *
+ * Args: ctx: pointer to a context object.
+ * In: fun: pointer to a function to call when an illegal argument is
+ * passed to the API, taking a message and an opaque pointer.
+ * (NULL restores the default handler.)
+ * data: the opaque pointer to pass to fun above, must be NULL for the default handler.
+ *
+ * See also secp256k1_context_set_error_callback.
+ */
+SECP256K1_API void secp256k1_context_set_illegal_callback(
+ secp256k1_context *ctx,
+ void (*fun)(const char *message, void *data),
+ const void *data
+) SECP256K1_ARG_NONNULL(1);
+
+/** Set a callback function to be called when an internal consistency check
+ * fails.
+ *
+ * The default callback writes an error message to stderr and calls abort
+ * to abort the program.
+ *
+ * This can only trigger in case of a hardware failure, miscompilation,
+ * memory corruption, serious bug in the library, or other error would can
+ * otherwise result in undefined behaviour. It will not trigger due to mere
+ * incorrect usage of the API (see secp256k1_context_set_illegal_callback
+ * for that). After this callback returns, anything may happen, including
+ * crashing.
+ *
+ * Args: ctx: pointer to a context object.
+ * In: fun: pointer to a function to call when an internal error occurs,
+ * taking a message and an opaque pointer (NULL restores the
+ * default handler, see secp256k1_context_set_illegal_callback
+ * for details).
+ * data: the opaque pointer to pass to fun above, must be NULL for the default handler.
+ *
+ * See also secp256k1_context_set_illegal_callback.
+ */
+SECP256K1_API void secp256k1_context_set_error_callback(
+ secp256k1_context *ctx,
+ void (*fun)(const char *message, void *data),
+ const void *data
+) SECP256K1_ARG_NONNULL(1);
+
+/** Create a secp256k1 scratch space object.
+ *
+ * Returns: a newly created scratch space.
+ * Args: ctx: pointer to a context object.
+ * In: size: amount of memory to be available as scratch space. Some extra
+ * (<100 bytes) will be allocated for extra accounting.
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT secp256k1_scratch_space *secp256k1_scratch_space_create(
+ const secp256k1_context *ctx,
+ size_t size
+) SECP256K1_ARG_NONNULL(1);
+
+/** Destroy a secp256k1 scratch space.
+ *
+ * The pointer may not be used afterwards.
+ * Args: ctx: pointer to a context object.
+ * scratch: space to destroy
+ */
+SECP256K1_API void secp256k1_scratch_space_destroy(
+ const secp256k1_context *ctx,
+ secp256k1_scratch_space *scratch
+) SECP256K1_ARG_NONNULL(1);
+
+/** Parse a variable-length public key into the pubkey object.
+ *
+ * Returns: 1 if the public key was fully valid.
+ * 0 if the public key could not be parsed or is invalid.
+ * Args: ctx: pointer to a context object.
+ * Out: pubkey: pointer to a pubkey object. If 1 is returned, it is set to a
+ * parsed version of input. If not, its value is undefined.
+ * In: input: pointer to a serialized public key
+ * inputlen: length of the array pointed to by input
+ *
+ * This function supports parsing compressed (33 bytes, header byte 0x02 or
+ * 0x03), uncompressed (65 bytes, header byte 0x04), or hybrid (65 bytes, header
+ * byte 0x06 or 0x07) format public keys.
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_parse(
+ const secp256k1_context *ctx,
+ secp256k1_pubkey *pubkey,
+ const unsigned char *input,
+ size_t inputlen
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Serialize a pubkey object into a serialized byte sequence.
+ *
+ * Returns: 1 always.
+ * Args: ctx: pointer to a context object.
+ * Out: output: pointer to a 65-byte (if compressed==0) or 33-byte (if
+ * compressed==1) byte array to place the serialized key
+ * in.
+ * In/Out: outputlen: pointer to an integer which is initially set to the
+ * size of output, and is overwritten with the written
+ * size.
+ * In: pubkey: pointer to a secp256k1_pubkey containing an
+ * initialized public key.
+ * flags: SECP256K1_EC_COMPRESSED if serialization should be in
+ * compressed format, otherwise SECP256K1_EC_UNCOMPRESSED.
+ */
+SECP256K1_API int secp256k1_ec_pubkey_serialize(
+ const secp256k1_context *ctx,
+ unsigned char *output,
+ size_t *outputlen,
+ const secp256k1_pubkey *pubkey,
+ unsigned int flags
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
+
+/** Compare two public keys using lexicographic (of compressed serialization) order
+ *
+ * Returns: <0 if the first public key is less than the second
+ * >0 if the first public key is greater than the second
+ * 0 if the two public keys are equal
+ * Args: ctx: pointer to a context object
+ * In: pubkey1: first public key to compare
+ * pubkey2: second public key to compare
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_cmp(
+ const secp256k1_context *ctx,
+ const secp256k1_pubkey *pubkey1,
+ const secp256k1_pubkey *pubkey2
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Parse an ECDSA signature in compact (64 bytes) format.
+ *
+ * Returns: 1 when the signature could be parsed, 0 otherwise.
+ * Args: ctx: pointer to a context object
+ * Out: sig: pointer to a signature object
+ * In: input64: pointer to the 64-byte array to parse
+ *
+ * The signature must consist of a 32-byte big endian R value, followed by a
+ * 32-byte big endian S value. If R or S fall outside of [0..order-1], the
+ * encoding is invalid. R and S with value 0 are allowed in the encoding.
+ *
+ * After the call, sig will always be initialized. If parsing failed or R or
+ * S are zero, the resulting sig value is guaranteed to fail verification for
+ * any message and public key.
+ */
+SECP256K1_API int secp256k1_ecdsa_signature_parse_compact(
+ const secp256k1_context *ctx,
+ secp256k1_ecdsa_signature *sig,
+ const unsigned char *input64
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Parse a DER ECDSA signature.
+ *
+ * Returns: 1 when the signature could be parsed, 0 otherwise.
+ * Args: ctx: pointer to a context object
+ * Out: sig: pointer to a signature object
+ * In: input: pointer to the signature to be parsed
+ * inputlen: the length of the array pointed to be input
+ *
+ * This function will accept any valid DER encoded signature, even if the
+ * encoded numbers are out of range.
+ *
+ * After the call, sig will always be initialized. If parsing failed or the
+ * encoded numbers are out of range, signature verification with it is
+ * guaranteed to fail for every message and public key.
+ */
+SECP256K1_API int secp256k1_ecdsa_signature_parse_der(
+ const secp256k1_context *ctx,
+ secp256k1_ecdsa_signature *sig,
+ const unsigned char *input,
+ size_t inputlen
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Serialize an ECDSA signature in DER format.
+ *
+ * Returns: 1 if enough space was available to serialize, 0 otherwise
+ * Args: ctx: pointer to a context object
+ * Out: output: pointer to an array to store the DER serialization
+ * In/Out: outputlen: pointer to a length integer. Initially, this integer
+ * should be set to the length of output. After the call
+ * it will be set to the length of the serialization (even
+ * if 0 was returned).
+ * In: sig: pointer to an initialized signature object
+ */
+SECP256K1_API int secp256k1_ecdsa_signature_serialize_der(
+ const secp256k1_context *ctx,
+ unsigned char *output,
+ size_t *outputlen,
+ const secp256k1_ecdsa_signature *sig
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
+
+/** Serialize an ECDSA signature in compact (64 byte) format.
+ *
+ * Returns: 1
+ * Args: ctx: pointer to a context object
+ * Out: output64: pointer to a 64-byte array to store the compact serialization
+ * In: sig: pointer to an initialized signature object
+ *
+ * See secp256k1_ecdsa_signature_parse_compact for details about the encoding.
+ */
+SECP256K1_API int secp256k1_ecdsa_signature_serialize_compact(
+ const secp256k1_context *ctx,
+ unsigned char *output64,
+ const secp256k1_ecdsa_signature *sig
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Verify an ECDSA signature.
+ *
+ * Returns: 1: correct signature
+ * 0: incorrect or unparseable signature
+ * Args: ctx: pointer to a context object
+ * In: sig: the signature being verified.
+ * msghash32: the 32-byte message hash being verified.
+ * The verifier must make sure to apply a cryptographic
+ * hash function to the message by itself and not accept an
+ * msghash32 value directly. Otherwise, it would be easy to
+ * create a "valid" signature without knowledge of the
+ * secret key. See also
+ * https://bitcoin.stackexchange.com/a/81116/35586 for more
+ * background on this topic.
+ * pubkey: pointer to an initialized public key to verify with.
+ *
+ * To avoid accepting malleable signatures, only ECDSA signatures in lower-S
+ * form are accepted.
+ *
+ * If you need to accept ECDSA signatures from sources that do not obey this
+ * rule, apply secp256k1_ecdsa_signature_normalize to the signature prior to
+ * verification, but be aware that doing so results in malleable signatures.
+ *
+ * For details, see the comments for that function.
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdsa_verify(
+ const secp256k1_context *ctx,
+ const secp256k1_ecdsa_signature *sig,
+ const unsigned char *msghash32,
+ const secp256k1_pubkey *pubkey
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
+
+/** Convert a signature to a normalized lower-S form.
+ *
+ * Returns: 1 if sigin was not normalized, 0 if it already was.
+ * Args: ctx: pointer to a context object
+ * Out: sigout: pointer to a signature to fill with the normalized form,
+ * or copy if the input was already normalized. (can be NULL if
+ * you're only interested in whether the input was already
+ * normalized).
+ * In: sigin: pointer to a signature to check/normalize (can be identical to sigout)
+ *
+ * With ECDSA a third-party can forge a second distinct signature of the same
+ * message, given a single initial signature, but without knowing the key. This
+ * is done by negating the S value modulo the order of the curve, 'flipping'
+ * the sign of the random point R which is not included in the signature.
+ *
+ * Forgery of the same message isn't universally problematic, but in systems
+ * where message malleability or uniqueness of signatures is important this can
+ * cause issues. This forgery can be blocked by all verifiers forcing signers
+ * to use a normalized form.
+ *
+ * The lower-S form reduces the size of signatures slightly on average when
+ * variable length encodings (such as DER) are used and is cheap to verify,
+ * making it a good choice. Security of always using lower-S is assured because
+ * anyone can trivially modify a signature after the fact to enforce this
+ * property anyway.
+ *
+ * The lower S value is always between 0x1 and
+ * 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0,
+ * inclusive.
+ *
+ * No other forms of ECDSA malleability are known and none seem likely, but
+ * there is no formal proof that ECDSA, even with this additional restriction,
+ * is free of other malleability. Commonly used serialization schemes will also
+ * accept various non-unique encodings, so care should be taken when this
+ * property is required for an application.
+ *
+ * The secp256k1_ecdsa_sign function will by default create signatures in the
+ * lower-S form, and secp256k1_ecdsa_verify will not accept others. In case
+ * signatures come from a system that cannot enforce this property,
+ * secp256k1_ecdsa_signature_normalize must be called before verification.
+ */
+SECP256K1_API int secp256k1_ecdsa_signature_normalize(
+ const secp256k1_context *ctx,
+ secp256k1_ecdsa_signature *sigout,
+ const secp256k1_ecdsa_signature *sigin
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(3);
+
+/** An implementation of RFC6979 (using HMAC-SHA256) as nonce generation function.
+ * If a data pointer is passed, it is assumed to be a pointer to 32 bytes of
+ * extra entropy.
+ */
+SECP256K1_API const secp256k1_nonce_function secp256k1_nonce_function_rfc6979;
+
+/** A default safe nonce generation function (currently equal to secp256k1_nonce_function_rfc6979). */
+SECP256K1_API const secp256k1_nonce_function secp256k1_nonce_function_default;
+
+/** Create an ECDSA signature.
+ *
+ * Returns: 1: signature created
+ * 0: the nonce generation function failed, or the secret key was invalid.
+ * Args: ctx: pointer to a context object (not secp256k1_context_static).
+ * Out: sig: pointer to an array where the signature will be placed.
+ * In: msghash32: the 32-byte message hash being signed.
+ * seckey: pointer to a 32-byte secret key.
+ * noncefp: pointer to a nonce generation function. If NULL,
+ * secp256k1_nonce_function_default is used.
+ * ndata: pointer to arbitrary data used by the nonce generation function
+ * (can be NULL). If it is non-NULL and
+ * secp256k1_nonce_function_default is used, then ndata must be a
+ * pointer to 32-bytes of additional data.
+ *
+ * The created signature is always in lower-S form. See
+ * secp256k1_ecdsa_signature_normalize for more details.
+ */
+SECP256K1_API int secp256k1_ecdsa_sign(
+ const secp256k1_context *ctx,
+ secp256k1_ecdsa_signature *sig,
+ const unsigned char *msghash32,
+ const unsigned char *seckey,
+ secp256k1_nonce_function noncefp,
+ const void *ndata
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
+
+/** Verify an ECDSA secret key.
+ *
+ * A secret key is valid if it is not 0 and less than the secp256k1 curve order
+ * when interpreted as an integer (most significant byte first). The
+ * probability of choosing a 32-byte string uniformly at random which is an
+ * invalid secret key is negligible.
+ *
+ * Returns: 1: secret key is valid
+ * 0: secret key is invalid
+ * Args: ctx: pointer to a context object.
+ * In: seckey: pointer to a 32-byte secret key.
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_verify(
+ const secp256k1_context *ctx,
+ const unsigned char *seckey
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
+
+/** Compute the public key for a secret key.
+ *
+ * Returns: 1: secret was valid, public key stores.
+ * 0: secret was invalid, try again.
+ * Args: ctx: pointer to a context object (not secp256k1_context_static).
+ * Out: pubkey: pointer to the created public key.
+ * In: seckey: pointer to a 32-byte secret key.
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_create(
+ const secp256k1_context *ctx,
+ secp256k1_pubkey *pubkey,
+ const unsigned char *seckey
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Negates a secret key in place.
+ *
+ * Returns: 0 if the given secret key is invalid according to
+ * secp256k1_ec_seckey_verify. 1 otherwise
+ * Args: ctx: pointer to a context object
+ * In/Out: seckey: pointer to the 32-byte secret key to be negated. If the
+ * secret key is invalid according to
+ * secp256k1_ec_seckey_verify, this function returns 0 and
+ * seckey will be set to some unspecified value.
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_negate(
+ const secp256k1_context *ctx,
+ unsigned char *seckey
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
+
+/** Same as secp256k1_ec_seckey_negate, but DEPRECATED. Will be removed in
+ * future versions. */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_negate(
+ const secp256k1_context *ctx,
+ unsigned char *seckey
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2)
+ SECP256K1_DEPRECATED("Use secp256k1_ec_seckey_negate instead");
+
+/** Negates a public key in place.
+ *
+ * Returns: 1 always
+ * Args: ctx: pointer to a context object
+ * In/Out: pubkey: pointer to the public key to be negated.
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_negate(
+ const secp256k1_context *ctx,
+ secp256k1_pubkey *pubkey
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
+
+/** Tweak a secret key by adding tweak to it.
+ *
+ * Returns: 0 if the arguments are invalid or the resulting secret key would be
+ * invalid (only when the tweak is the negation of the secret key). 1
+ * otherwise.
+ * Args: ctx: pointer to a context object.
+ * In/Out: seckey: pointer to a 32-byte secret key. If the secret key is
+ * invalid according to secp256k1_ec_seckey_verify, this
+ * function returns 0. seckey will be set to some unspecified
+ * value if this function returns 0.
+ * In: tweak32: pointer to a 32-byte tweak, which must be valid according to
+ * secp256k1_ec_seckey_verify or 32 zero bytes. For uniformly
+ * random 32-byte tweaks, the chance of being invalid is
+ * negligible (around 1 in 2^128).
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_tweak_add(
+ const secp256k1_context *ctx,
+ unsigned char *seckey,
+ const unsigned char *tweak32
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Same as secp256k1_ec_seckey_tweak_add, but DEPRECATED. Will be removed in
+ * future versions. */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_tweak_add(
+ const secp256k1_context *ctx,
+ unsigned char *seckey,
+ const unsigned char *tweak32
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3)
+ SECP256K1_DEPRECATED("Use secp256k1_ec_seckey_tweak_add instead");
+
+/** Tweak a public key by adding tweak times the generator to it.
+ *
+ * Returns: 0 if the arguments are invalid or the resulting public key would be
+ * invalid (only when the tweak is the negation of the corresponding
+ * secret key). 1 otherwise.
+ * Args: ctx: pointer to a context object.
+ * In/Out: pubkey: pointer to a public key object. pubkey will be set to an
+ * invalid value if this function returns 0.
+ * In: tweak32: pointer to a 32-byte tweak, which must be valid according to
+ * secp256k1_ec_seckey_verify or 32 zero bytes. For uniformly
+ * random 32-byte tweaks, the chance of being invalid is
+ * negligible (around 1 in 2^128).
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_tweak_add(
+ const secp256k1_context *ctx,
+ secp256k1_pubkey *pubkey,
+ const unsigned char *tweak32
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Tweak a secret key by multiplying it by a tweak.
+ *
+ * Returns: 0 if the arguments are invalid. 1 otherwise.
+ * Args: ctx: pointer to a context object.
+ * In/Out: seckey: pointer to a 32-byte secret key. If the secret key is
+ * invalid according to secp256k1_ec_seckey_verify, this
+ * function returns 0. seckey will be set to some unspecified
+ * value if this function returns 0.
+ * In: tweak32: pointer to a 32-byte tweak. If the tweak is invalid according to
+ * secp256k1_ec_seckey_verify, this function returns 0. For
+ * uniformly random 32-byte arrays the chance of being invalid
+ * is negligible (around 1 in 2^128).
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_tweak_mul(
+ const secp256k1_context *ctx,
+ unsigned char *seckey,
+ const unsigned char *tweak32
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Same as secp256k1_ec_seckey_tweak_mul, but DEPRECATED. Will be removed in
+ * future versions. */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_tweak_mul(
+ const secp256k1_context *ctx,
+ unsigned char *seckey,
+ const unsigned char *tweak32
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3)
+ SECP256K1_DEPRECATED("Use secp256k1_ec_seckey_tweak_mul instead");
+
+/** Tweak a public key by multiplying it by a tweak value.
+ *
+ * Returns: 0 if the arguments are invalid. 1 otherwise.
+ * Args: ctx: pointer to a context object.
+ * In/Out: pubkey: pointer to a public key object. pubkey will be set to an
+ * invalid value if this function returns 0.
+ * In: tweak32: pointer to a 32-byte tweak. If the tweak is invalid according to
+ * secp256k1_ec_seckey_verify, this function returns 0. For
+ * uniformly random 32-byte arrays the chance of being invalid
+ * is negligible (around 1 in 2^128).
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_tweak_mul(
+ const secp256k1_context *ctx,
+ secp256k1_pubkey *pubkey,
+ const unsigned char *tweak32
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Randomizes the context to provide enhanced protection against side-channel leakage.
+ *
+ * Returns: 1: randomization successful
+ * 0: error
+ * Args: ctx: pointer to a context object (not secp256k1_context_static).
+ * In: seed32: pointer to a 32-byte random seed (NULL resets to initial state).
+ *
+ * While secp256k1 code is written and tested to be constant-time no matter what
+ * secret values are, it is possible that a compiler may output code which is not,
+ * and also that the CPU may not emit the same radio frequencies or draw the same
+ * amount of power for all values. Randomization of the context shields against
+ * side-channel observations which aim to exploit secret-dependent behaviour in
+ * certain computations which involve secret keys.
+ *
+ * It is highly recommended to call this function on contexts returned from
+ * secp256k1_context_create or secp256k1_context_clone (or from the corresponding
+ * functions in secp256k1_preallocated.h) before using these contexts to call API
+ * functions that perform computations involving secret keys, e.g., signing and
+ * public key generation. It is possible to call this function more than once on
+ * the same context, and doing so before every few computations involving secret
+ * keys is recommended as a defense-in-depth measure. Randomization of the static
+ * context secp256k1_context_static is not supported.
+ *
+ * Currently, the random seed is mainly used for blinding multiplications of a
+ * secret scalar with the elliptic curve base point. Multiplications of this
+ * kind are performed by exactly those API functions which are documented to
+ * require a context that is not secp256k1_context_static. As a rule of thumb,
+ * these are all functions which take a secret key (or a keypair) as an input.
+ * A notable exception to that rule is the ECDH module, which relies on a different
+ * kind of elliptic curve point multiplication and thus does not benefit from
+ * enhanced protection against side-channel leakage currently.
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_context_randomize(
+ secp256k1_context *ctx,
+ const unsigned char *seed32
+) SECP256K1_ARG_NONNULL(1);
+
+/** Add a number of public keys together.
+ *
+ * Returns: 1: the sum of the public keys is valid.
+ * 0: the sum of the public keys is not valid.
+ * Args: ctx: pointer to a context object.
+ * Out: out: pointer to a public key object for placing the resulting public key.
+ * In: ins: pointer to array of pointers to public keys.
+ * n: the number of public keys to add together (must be at least 1).
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_combine(
+ const secp256k1_context *ctx,
+ secp256k1_pubkey *out,
+ const secp256k1_pubkey * const *ins,
+ size_t n
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+/** Compute a tagged hash as defined in BIP-340.
+ *
+ * This is useful for creating a message hash and achieving domain separation
+ * through an application-specific tag. This function returns
+ * SHA256(SHA256(tag)||SHA256(tag)||msg). Therefore, tagged hash
+ * implementations optimized for a specific tag can precompute the SHA256 state
+ * after hashing the tag hashes.
+ *
+ * Returns: 1 always.
+ * Args: ctx: pointer to a context object
+ * Out: hash32: pointer to a 32-byte array to store the resulting hash
+ * In: tag: pointer to an array containing the tag
+ * taglen: length of the tag array
+ * msg: pointer to an array containing the message
+ * msglen: length of the message array
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_tagged_sha256(
+ const secp256k1_context *ctx,
+ unsigned char *hash32,
+ const unsigned char *tag,
+ size_t taglen,
+ const unsigned char *msg,
+ size_t msglen
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(5);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SECP256K1_H */
diff --git a/vendor/secp256k1/include/secp256k1/secp256k1_ecdh.h b/vendor/secp256k1/include/secp256k1/secp256k1_ecdh.h
new file mode 100644
index 0000000..4d9da34
--- /dev/null
+++ b/vendor/secp256k1/include/secp256k1/secp256k1_ecdh.h
@@ -0,0 +1,63 @@
+#ifndef SECP256K1_ECDH_H
+#define SECP256K1_ECDH_H
+
+#include "secp256k1.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** A pointer to a function that hashes an EC point to obtain an ECDH secret
+ *
+ * Returns: 1 if the point was successfully hashed.
+ * 0 will cause secp256k1_ecdh to fail and return 0.
+ * Other return values are not allowed, and the behaviour of
+ * secp256k1_ecdh is undefined for other return values.
+ * Out: output: pointer to an array to be filled by the function
+ * In: x32: pointer to a 32-byte x coordinate
+ * y32: pointer to a 32-byte y coordinate
+ * data: arbitrary data pointer that is passed through
+ */
+typedef int (*secp256k1_ecdh_hash_function)(
+ unsigned char *output,
+ const unsigned char *x32,
+ const unsigned char *y32,
+ void *data
+);
+
+/** An implementation of SHA256 hash function that applies to compressed public key.
+ * Populates the output parameter with 32 bytes. */
+SECP256K1_API const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_sha256;
+
+/** A default ECDH hash function (currently equal to secp256k1_ecdh_hash_function_sha256).
+ * Populates the output parameter with 32 bytes. */
+SECP256K1_API const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_default;
+
+/** Compute an EC Diffie-Hellman secret in constant time
+ *
+ * Returns: 1: exponentiation was successful
+ * 0: scalar was invalid (zero or overflow) or hashfp returned 0
+ * Args: ctx: pointer to a context object.
+ * Out: output: pointer to an array to be filled by hashfp.
+ * In: pubkey: pointer to a secp256k1_pubkey containing an initialized public key.
+ * seckey: a 32-byte scalar with which to multiply the point.
+ * hashfp: pointer to a hash function. If NULL,
+ * secp256k1_ecdh_hash_function_sha256 is used
+ * (in which case, 32 bytes will be written to output).
+ * data: arbitrary data pointer that is passed through to hashfp
+ * (can be NULL for secp256k1_ecdh_hash_function_sha256).
+ */
+SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdh(
+ const secp256k1_context *ctx,
+ unsigned char *output,
+ const secp256k1_pubkey *pubkey,
+ const unsigned char *seckey,
+ secp256k1_ecdh_hash_function hashfp,
+ void *data
+) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SECP256K1_ECDH_H */
diff --git a/vendor/secp256k1/include/secp256k1/secp256k1_extrakeys.h b/vendor/secp256k1/include/secp256k1/secp256k1_extrakeys.h
new file mode 100644
index 0000000..4cc6d4f
--- /dev/null
+++ b/vendor/secp256k1/include/secp256k1/secp256k1_extrakeys.h
@@ -0,0 +1,247 @@
+#ifndef SECP256K1_EXTRAKEYS_H
+#define SECP256K1_EXTRAKEYS_H
+
+#include "secp256k1.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+ /** Opaque data structure that holds a parsed and valid "x-only" public key.
+ * An x-only pubkey encodes a point whose Y coordinate is even. It is
+ * serialized using only its X coordinate (32 bytes). See BIP-340 for more
+ * information about x-only pubkeys.
+ *
+ * The exact representation of data inside is implementation defined and not
+ * guaranteed to be portable between different platforms or versions. It is
+ * however guaranteed to be 64 bytes in size, and can be safely copied/moved.
+ * If you need to convert to a format suitable for storage, transmission, use
+ * use secp256k1_xonly_pubkey_serialize and secp256k1_xonly_pubkey_parse. To
+ * compare keys, use secp256k1_xonly_pubkey_cmp.
+ */
+ typedef struct {
+ unsigned char data[64];
+ } secp256k1_xonly_pubkey;
+
+ /** Opaque data structure that holds a keypair consisting of a secret and a
+ * public key.
+ *
+ * The exact representation of data inside is implementation defined and not
+ * guaranteed to be portable between different platforms or versions. It is
+ * however guaranteed to be 96 bytes in size, and can be safely copied/moved.
+ */
+ typedef struct {
+ unsigned char data[96];
+ } secp256k1_keypair;
+
+ /** Parse a 32-byte sequence into a xonly_pubkey object.
+ *
+ * Returns: 1 if the public key was fully valid.
+ * 0 if the public key could not be parsed or is invalid.
+ *
+ * Args: ctx: pointer to a context object.
+ * Out: pubkey: pointer to a pubkey object. If 1 is returned, it is set to a
+ * parsed version of input. If not, it's set to an invalid value.
+ * In: input32: pointer to a serialized xonly_pubkey.
+ */
+ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_xonly_pubkey_parse(
+ const secp256k1_context* ctx,
+ secp256k1_xonly_pubkey* pubkey,
+ const unsigned char* input32
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+ /** Serialize an xonly_pubkey object into a 32-byte sequence.
+ *
+ * Returns: 1 always.
+ *
+ * Args: ctx: pointer to a context object.
+ * Out: output32: pointer to a 32-byte array to place the serialized key in.
+ * In: pubkey: pointer to a secp256k1_xonly_pubkey containing an initialized public key.
+ */
+ SECP256K1_API int secp256k1_xonly_pubkey_serialize(
+ const secp256k1_context* ctx,
+ unsigned char* output32,
+ const secp256k1_xonly_pubkey* pubkey
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+ /** Compare two x-only public keys using lexicographic order
+ *
+ * Returns: <0 if the first public key is less than the second
+ * >0 if the first public key is greater than the second
+ * 0 if the two public keys are equal
+ * Args: ctx: pointer to a context object.
+ * In: pubkey1: first public key to compare
+ * pubkey2: second public key to compare
+ */
+ SECP256K1_API int secp256k1_xonly_pubkey_cmp(
+ const secp256k1_context* ctx,
+ const secp256k1_xonly_pubkey* pk1,
+ const secp256k1_xonly_pubkey* pk2
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+ /** Converts a secp256k1_pubkey into a secp256k1_xonly_pubkey.
+ *
+ * Returns: 1 always.
+ *
+ * Args: ctx: pointer to a context object.
+ * Out: xonly_pubkey: pointer to an x-only public key object for placing the converted public key.
+ * pk_parity: Ignored if NULL. Otherwise, pointer to an integer that
+ * will be set to 1 if the point encoded by xonly_pubkey is
+ * the negation of the pubkey and set to 0 otherwise.
+ * In: pubkey: pointer to a public key that is converted.
+ */
+ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_xonly_pubkey_from_pubkey(
+ const secp256k1_context* ctx,
+ secp256k1_xonly_pubkey* xonly_pubkey,
+ int* pk_parity,
+ const secp256k1_pubkey* pubkey
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(4);
+
+ /** Tweak an x-only public key by adding the generator multiplied with tweak32
+ * to it.
+ *
+ * Note that the resulting point can not in general be represented by an x-only
+ * pubkey because it may have an odd Y coordinate. Instead, the output_pubkey
+ * is a normal secp256k1_pubkey.
+ *
+ * Returns: 0 if the arguments are invalid or the resulting public key would be
+ * invalid (only when the tweak is the negation of the corresponding
+ * secret key). 1 otherwise.
+ *
+ * Args: ctx: pointer to a context object.
+ * Out: output_pubkey: pointer to a public key to store the result. Will be set
+ * to an invalid value if this function returns 0.
+ * In: internal_pubkey: pointer to an x-only pubkey to apply the tweak to.
+ * tweak32: pointer to a 32-byte tweak, which must be valid
+ * according to secp256k1_ec_seckey_verify or 32 zero
+ * bytes. For uniformly random 32-byte tweaks, the chance of
+ * being invalid is negligible (around 1 in 2^128).
+ */
+ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_xonly_pubkey_tweak_add(
+ const secp256k1_context* ctx,
+ secp256k1_pubkey* output_pubkey,
+ const secp256k1_xonly_pubkey* internal_pubkey,
+ const unsigned char* tweak32
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
+
+ /** Checks that a tweaked pubkey is the result of calling
+ * secp256k1_xonly_pubkey_tweak_add with internal_pubkey and tweak32.
+ *
+ * The tweaked pubkey is represented by its 32-byte x-only serialization and
+ * its pk_parity, which can both be obtained by converting the result of
+ * tweak_add to a secp256k1_xonly_pubkey.
+ *
+ * Note that this alone does _not_ verify that the tweaked pubkey is a
+ * commitment. If the tweak is not chosen in a specific way, the tweaked pubkey
+ * can easily be the result of a different internal_pubkey and tweak.
+ *
+ * Returns: 0 if the arguments are invalid or the tweaked pubkey is not the
+ * result of tweaking the internal_pubkey with tweak32. 1 otherwise.
+ * Args: ctx: pointer to a context object.
+ * In: tweaked_pubkey32: pointer to a serialized xonly_pubkey.
+ * tweaked_pk_parity: the parity of the tweaked pubkey (whose serialization
+ * is passed in as tweaked_pubkey32). This must match the
+ * pk_parity value that is returned when calling
+ * secp256k1_xonly_pubkey with the tweaked pubkey, or
+ * this function will fail.
+ * internal_pubkey: pointer to an x-only public key object to apply the tweak to.
+ * tweak32: pointer to a 32-byte tweak.
+ */
+ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_xonly_pubkey_tweak_add_check(
+ const secp256k1_context* ctx,
+ const unsigned char* tweaked_pubkey32,
+ int tweaked_pk_parity,
+ const secp256k1_xonly_pubkey* internal_pubkey,
+ const unsigned char* tweak32
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(4) SECP256K1_ARG_NONNULL(5);
+
+ /** Compute the keypair for a secret key.
+ *
+ * Returns: 1: secret was valid, keypair is ready to use
+ * 0: secret was invalid, try again with a different secret
+ * Args: ctx: pointer to a context object (not secp256k1_context_static).
+ * Out: keypair: pointer to the created keypair.
+ * In: seckey: pointer to a 32-byte secret key.
+ */
+ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_keypair_create(
+ const secp256k1_context* ctx,
+ secp256k1_keypair* keypair,
+ const unsigned char* seckey
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+ /** Get the secret key from a keypair.
+ *
+ * Returns: 1 always.
+ * Args: ctx: pointer to a context object.
+ * Out: seckey: pointer to a 32-byte buffer for the secret key.
+ * In: keypair: pointer to a keypair.
+ */
+ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_keypair_sec(
+ const secp256k1_context* ctx,
+ unsigned char* seckey,
+ const secp256k1_keypair* keypair
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+ /** Get the public key from a keypair.
+ *
+ * Returns: 1 always.
+ * Args: ctx: pointer to a context object.
+ * Out: pubkey: pointer to a pubkey object, set to the keypair public key.
+ * In: keypair: pointer to a keypair.
+ */
+ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_keypair_pub(
+ const secp256k1_context* ctx,
+ secp256k1_pubkey* pubkey,
+ const secp256k1_keypair* keypair
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+ /** Get the x-only public key from a keypair.
+ *
+ * This is the same as calling secp256k1_keypair_pub and then
+ * secp256k1_xonly_pubkey_from_pubkey.
+ *
+ * Returns: 1 always.
+ * Args: ctx: pointer to a context object.
+ * Out: pubkey: pointer to an xonly_pubkey object, set to the keypair
+ * public key after converting it to an xonly_pubkey.
+ * pk_parity: Ignored if NULL. Otherwise, pointer to an integer that will be set to the
+ * pk_parity argument of secp256k1_xonly_pubkey_from_pubkey.
+ * In: keypair: pointer to a keypair.
+ */
+ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_keypair_xonly_pub(
+ const secp256k1_context* ctx,
+ secp256k1_xonly_pubkey* pubkey,
+ int* pk_parity,
+ const secp256k1_keypair* keypair
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(4);
+
+ /** Tweak a keypair by adding tweak32 to the secret key and updating the public
+ * key accordingly.
+ *
+ * Calling this function and then secp256k1_keypair_pub results in the same
+ * public key as calling secp256k1_keypair_xonly_pub and then
+ * secp256k1_xonly_pubkey_tweak_add.
+ *
+ * Returns: 0 if the arguments are invalid or the resulting keypair would be
+ * invalid (only when the tweak is the negation of the keypair's
+ * secret key). 1 otherwise.
+ *
+ * Args: ctx: pointer to a context object.
+ * In/Out: keypair: pointer to a keypair to apply the tweak to. Will be set to
+ * an invalid value if this function returns 0.
+ * In: tweak32: pointer to a 32-byte tweak, which must be valid according to
+ * secp256k1_ec_seckey_verify or 32 zero bytes. For uniformly
+ * random 32-byte tweaks, the chance of being invalid is
+ * negligible (around 1 in 2^128).
+ */
+ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_keypair_xonly_tweak_add(
+ const secp256k1_context* ctx,
+ secp256k1_keypair* keypair,
+ const unsigned char* tweak32
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SECP256K1_EXTRAKEYS_H */ \ No newline at end of file
diff --git a/vendor/secp256k1/include/secp256k1/secp256k1_schnorrsig.h b/vendor/secp256k1/include/secp256k1/secp256k1_schnorrsig.h
new file mode 100644
index 0000000..5c338f4
--- /dev/null
+++ b/vendor/secp256k1/include/secp256k1/secp256k1_schnorrsig.h
@@ -0,0 +1,190 @@
+#ifndef SECP256K1_SCHNORRSIG_H
+#define SECP256K1_SCHNORRSIG_H
+
+#include "secp256k1.h"
+#include "secp256k1_extrakeys.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+ /** This module implements a variant of Schnorr signatures compliant with
+ * Bitcoin Improvement Proposal 340 "Schnorr Signatures for secp256k1"
+ * (https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki).
+ */
+
+ /** A pointer to a function to deterministically generate a nonce.
+ *
+ * Same as secp256k1_nonce function with the exception of accepting an
+ * additional pubkey argument and not requiring an attempt argument. The pubkey
+ * argument can protect signature schemes with key-prefixed challenge hash
+ * inputs against reusing the nonce when signing with the wrong precomputed
+ * pubkey.
+ *
+ * Returns: 1 if a nonce was successfully generated. 0 will cause signing to
+ * return an error.
+ * Out: nonce32: pointer to a 32-byte array to be filled by the function
+ * In: msg: the message being verified. Is NULL if and only if msglen
+ * is 0.
+ * msglen: the length of the message
+ * key32: pointer to a 32-byte secret key (will not be NULL)
+ * xonly_pk32: the 32-byte serialized xonly pubkey corresponding to key32
+ * (will not be NULL)
+ * algo: pointer to an array describing the signature
+ * algorithm (will not be NULL)
+ * algolen: the length of the algo array
+ * data: arbitrary data pointer that is passed through
+ *
+ * Except for test cases, this function should compute some cryptographic hash of
+ * the message, the key, the pubkey, the algorithm description, and data.
+ */
+ typedef int (*secp256k1_nonce_function_hardened)(
+ unsigned char* nonce32,
+ const unsigned char* msg,
+ size_t msglen,
+ const unsigned char* key32,
+ const unsigned char* xonly_pk32,
+ const unsigned char* algo,
+ size_t algolen,
+ void* data
+ );
+
+ /** An implementation of the nonce generation function as defined in Bitcoin
+ * Improvement Proposal 340 "Schnorr Signatures for secp256k1"
+ * (https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki).
+ *
+ * If a data pointer is passed, it is assumed to be a pointer to 32 bytes of
+ * auxiliary random data as defined in BIP-340. If the data pointer is NULL,
+ * the nonce derivation procedure follows BIP-340 by setting the auxiliary
+ * random data to zero. The algo argument must be non-NULL, otherwise the
+ * function will fail and return 0. The hash will be tagged with algo.
+ * Therefore, to create BIP-340 compliant signatures, algo must be set to
+ * "BIP0340/nonce" and algolen to 13.
+ */
+ SECP256K1_API const secp256k1_nonce_function_hardened secp256k1_nonce_function_bip340;
+
+ /** Data structure that contains additional arguments for schnorrsig_sign_custom.
+ *
+ * A schnorrsig_extraparams structure object can be initialized correctly by
+ * setting it to SECP256K1_SCHNORRSIG_EXTRAPARAMS_INIT.
+ *
+ * Members:
+ * magic: set to SECP256K1_SCHNORRSIG_EXTRAPARAMS_MAGIC at initialization
+ * and has no other function than making sure the object is
+ * initialized.
+ * noncefp: pointer to a nonce generation function. If NULL,
+ * secp256k1_nonce_function_bip340 is used
+ * ndata: pointer to arbitrary data used by the nonce generation function
+ * (can be NULL). If it is non-NULL and
+ * secp256k1_nonce_function_bip340 is used, then ndata must be a
+ * pointer to 32-byte auxiliary randomness as per BIP-340.
+ */
+ typedef struct {
+ unsigned char magic[4];
+ secp256k1_nonce_function_hardened noncefp;
+ void* ndata;
+ } secp256k1_schnorrsig_extraparams;
+
+#define SECP256K1_SCHNORRSIG_EXTRAPARAMS_MAGIC { 0xda, 0x6f, 0xb3, 0x8c }
+#define SECP256K1_SCHNORRSIG_EXTRAPARAMS_INIT {\
+ SECP256K1_SCHNORRSIG_EXTRAPARAMS_MAGIC,\
+ NULL,\
+ NULL\
+}
+
+ /** Create a Schnorr signature.
+ *
+ * Does _not_ strictly follow BIP-340 because it does not verify the resulting
+ * signature. Instead, you can manually use secp256k1_schnorrsig_verify and
+ * abort if it fails.
+ *
+ * This function only signs 32-byte messages. If you have messages of a
+ * different size (or the same size but without a context-specific tag
+ * prefix), it is recommended to create a 32-byte message hash with
+ * secp256k1_tagged_sha256 and then sign the hash. Tagged hashing allows
+ * providing an context-specific tag for domain separation. This prevents
+ * signatures from being valid in multiple contexts by accident.
+ *
+ * Returns 1 on success, 0 on failure.
+ * Args: ctx: pointer to a context object (not secp256k1_context_static).
+ * Out: sig64: pointer to a 64-byte array to store the serialized signature.
+ * In: msg32: the 32-byte message being signed.
+ * keypair: pointer to an initialized keypair.
+ * aux_rand32: 32 bytes of fresh randomness. While recommended to provide
+ * this, it is only supplemental to security and can be NULL. A
+ * NULL argument is treated the same as an all-zero one. See
+ * BIP-340 "Default Signing" for a full explanation of this
+ * argument and for guidance if randomness is expensive.
+ */
+ SECP256K1_API int secp256k1_schnorrsig_sign32(
+ const secp256k1_context* ctx,
+ unsigned char* sig64,
+ const unsigned char* msg32,
+ const secp256k1_keypair* keypair,
+ const unsigned char* aux_rand32
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
+
+ /** Same as secp256k1_schnorrsig_sign32, but DEPRECATED. Will be removed in
+ * future versions. */
+ SECP256K1_API int secp256k1_schnorrsig_sign(
+ const secp256k1_context* ctx,
+ unsigned char* sig64,
+ const unsigned char* msg32,
+ const secp256k1_keypair* keypair,
+ const unsigned char* aux_rand32
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4)
+ SECP256K1_DEPRECATED("Use secp256k1_schnorrsig_sign32 instead");
+
+ /** Create a Schnorr signature with a more flexible API.
+ *
+ * Same arguments as secp256k1_schnorrsig_sign except that it allows signing
+ * variable length messages and accepts a pointer to an extraparams object that
+ * allows customizing signing by passing additional arguments.
+ *
+ * Equivalent to secp256k1_schnorrsig_sign32(..., aux_rand32) if msglen is 32
+ * and extraparams is initialized as follows:
+ * ```
+ * secp256k1_schnorrsig_extraparams extraparams = SECP256K1_SCHNORRSIG_EXTRAPARAMS_INIT;
+ * extraparams.ndata = (unsigned char*)aux_rand32;
+ * ```
+ *
+ * Returns 1 on success, 0 on failure.
+ * Args: ctx: pointer to a context object (not secp256k1_context_static).
+ * Out: sig64: pointer to a 64-byte array to store the serialized signature.
+ * In: msg: the message being signed. Can only be NULL if msglen is 0.
+ * msglen: length of the message.
+ * keypair: pointer to an initialized keypair.
+ * extraparams: pointer to an extraparams object (can be NULL).
+ */
+ SECP256K1_API int secp256k1_schnorrsig_sign_custom(
+ const secp256k1_context* ctx,
+ unsigned char* sig64,
+ const unsigned char* msg,
+ size_t msglen,
+ const secp256k1_keypair* keypair,
+ secp256k1_schnorrsig_extraparams* extraparams
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(5);
+
+ /** Verify a Schnorr signature.
+ *
+ * Returns: 1: correct signature
+ * 0: incorrect signature
+ * Args: ctx: pointer to a context object.
+ * In: sig64: pointer to the 64-byte signature to verify.
+ * msg: the message being verified. Can only be NULL if msglen is 0.
+ * msglen: length of the message
+ * pubkey: pointer to an x-only public key to verify with
+ */
+ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_schnorrsig_verify(
+ const secp256k1_context* ctx,
+ const unsigned char* sig64,
+ const unsigned char* msg,
+ size_t msglen,
+ const secp256k1_xonly_pubkey* pubkey
+ ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(5);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SECP256K1_SCHNORRSIG_H */