refactor: Finish support and testing for mbedtls

1 files changed, 0 insertions, 1091 deletions

diff --git a/vendor/mbedtls/pk.h b/vendor/mbedtls/pk.h
deleted file mode 100644
index 24b1188..0000000
--- a/vendor/mbedtls/pk.h
+++ /dev/null
@@ -1,1091 +0,0 @@
-/**
- * \file pk.h
- *
- * \brief Public Key abstraction layer
- */
-/*
- *  Copyright The Mbed TLS Contributors
- *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
- */
-
-#ifndef MBEDTLS_PK_H
-#define MBEDTLS_PK_H
-#include "mbedtls/private_access.h"
-
-#include "mbedtls/build_info.h"
-
-#include "mbedtls/md.h"
-
-#if defined(MBEDTLS_RSA_C)
-#include "mbedtls/rsa.h"
-#endif
-
-#if defined(MBEDTLS_ECP_C)
-#include "mbedtls/ecp.h"
-#endif
-
-#if defined(MBEDTLS_ECDSA_C)
-#include "mbedtls/ecdsa.h"
-#endif
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_PSA_CRYPTO_C)
-#include "psa/crypto.h"
-#endif
-
-/** Memory allocation failed. */
-#define MBEDTLS_ERR_PK_ALLOC_FAILED        -0x3F80
-/** Type mismatch, eg attempt to encrypt with an ECDSA key */
-#define MBEDTLS_ERR_PK_TYPE_MISMATCH       -0x3F00
-/** Bad input parameters to function. */
-#define MBEDTLS_ERR_PK_BAD_INPUT_DATA      -0x3E80
-/** Read/write of file failed. */
-#define MBEDTLS_ERR_PK_FILE_IO_ERROR       -0x3E00
-/** Unsupported key version */
-#define MBEDTLS_ERR_PK_KEY_INVALID_VERSION -0x3D80
-/** Invalid key tag or value. */
-#define MBEDTLS_ERR_PK_KEY_INVALID_FORMAT  -0x3D00
-/** Key algorithm is unsupported (only RSA and EC are supported). */
-#define MBEDTLS_ERR_PK_UNKNOWN_PK_ALG      -0x3C80
-/** Private key password can't be empty. */
-#define MBEDTLS_ERR_PK_PASSWORD_REQUIRED   -0x3C00
-/** Given private key password does not allow for correct decryption. */
-#define MBEDTLS_ERR_PK_PASSWORD_MISMATCH   -0x3B80
-/** The pubkey tag or value is invalid (only RSA and EC are supported). */
-#define MBEDTLS_ERR_PK_INVALID_PUBKEY      -0x3B00
-/** The algorithm tag or value is invalid. */
-#define MBEDTLS_ERR_PK_INVALID_ALG         -0x3A80
-/** Elliptic curve is unsupported (only NIST curves are supported). */
-#define MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE -0x3A00
-/** Unavailable feature, e.g. RSA disabled for RSA key. */
-#define MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE -0x3980
-/** The buffer contains a valid signature followed by more data. */
-#define MBEDTLS_ERR_PK_SIG_LEN_MISMATCH    -0x3900
-/** The output buffer is too small. */
-#define MBEDTLS_ERR_PK_BUFFER_TOO_SMALL    -0x3880
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * \brief          Public key types
- */
-typedef enum {
-    MBEDTLS_PK_NONE=0,
-    MBEDTLS_PK_RSA,
-    MBEDTLS_PK_ECKEY,
-    MBEDTLS_PK_ECKEY_DH,
-    MBEDTLS_PK_ECDSA,
-    MBEDTLS_PK_RSA_ALT,
-    MBEDTLS_PK_RSASSA_PSS,
-    MBEDTLS_PK_OPAQUE,
-} mbedtls_pk_type_t;
-
-/**
- * \brief           Options for RSASSA-PSS signature verification.
- *                  See \c mbedtls_rsa_rsassa_pss_verify_ext()
- */
-typedef struct mbedtls_pk_rsassa_pss_options {
-    /** The digest to use for MGF1 in PSS.
-     *
-     * \note When #MBEDTLS_USE_PSA_CRYPTO is enabled and #MBEDTLS_RSA_C is
-     *       disabled, this must be equal to the \c md_alg argument passed
-     *       to mbedtls_pk_verify_ext(). In a future version of the library,
-     *       this constraint may apply whenever #MBEDTLS_USE_PSA_CRYPTO is
-     *       enabled regardless of the status of #MBEDTLS_RSA_C.
-     */
-    mbedtls_md_type_t mgf1_hash_id;
-
-    /** The expected length of the salt, in bytes. This may be
-     * #MBEDTLS_RSA_SALT_LEN_ANY to accept any salt length.
-     *
-     * \note When #MBEDTLS_USE_PSA_CRYPTO is enabled, only
-     *       #MBEDTLS_RSA_SALT_LEN_ANY is valid. Any other value may be
-     *       ignored (allowing any salt length).
-     */
-    int expected_salt_len;
-
-} mbedtls_pk_rsassa_pss_options;
-
-/**
- * \brief           Maximum size of a signature made by mbedtls_pk_sign().
- */
-/* We need to set MBEDTLS_PK_SIGNATURE_MAX_SIZE to the maximum signature
- * size among the supported signature types. Do it by starting at 0,
- * then incrementally increasing to be large enough for each supported
- * signature mechanism.
- *
- * The resulting value can be 0, for example if MBEDTLS_ECDH_C is enabled
- * (which allows the pk module to be included) but neither MBEDTLS_ECDSA_C
- * nor MBEDTLS_RSA_C nor any opaque signature mechanism (PSA or RSA_ALT).
- */
-#define MBEDTLS_PK_SIGNATURE_MAX_SIZE 0
-
-#if (defined(MBEDTLS_RSA_C) || defined(MBEDTLS_PK_RSA_ALT_SUPPORT)) && \
-    MBEDTLS_MPI_MAX_SIZE > MBEDTLS_PK_SIGNATURE_MAX_SIZE
-/* For RSA, the signature can be as large as the bignum module allows.
- * For RSA_ALT, the signature size is not necessarily tied to what the
- * bignum module can do, but in the absence of any specific setting,
- * we use that (rsa_alt_sign_wrap in library/pk_wrap.h will check). */
-#undef MBEDTLS_PK_SIGNATURE_MAX_SIZE
-#define MBEDTLS_PK_SIGNATURE_MAX_SIZE MBEDTLS_MPI_MAX_SIZE
-#endif
-
-#if defined(MBEDTLS_ECDSA_C) &&                                 \
-    MBEDTLS_ECDSA_MAX_LEN > MBEDTLS_PK_SIGNATURE_MAX_SIZE
-/* For ECDSA, the ecdsa module exports a constant for the maximum
- * signature size. */
-#undef MBEDTLS_PK_SIGNATURE_MAX_SIZE
-#define MBEDTLS_PK_SIGNATURE_MAX_SIZE MBEDTLS_ECDSA_MAX_LEN
-#endif
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-#if PSA_SIGNATURE_MAX_SIZE > MBEDTLS_PK_SIGNATURE_MAX_SIZE
-/* PSA_SIGNATURE_MAX_SIZE is the maximum size of a signature made
- * through the PSA API in the PSA representation. */
-#undef MBEDTLS_PK_SIGNATURE_MAX_SIZE
-#define MBEDTLS_PK_SIGNATURE_MAX_SIZE PSA_SIGNATURE_MAX_SIZE
-#endif
-
-#if PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE + 11 > MBEDTLS_PK_SIGNATURE_MAX_SIZE
-/* The Mbed TLS representation is different for ECDSA signatures:
- * PSA uses the raw concatenation of r and s,
- * whereas Mbed TLS uses the ASN.1 representation (SEQUENCE of two INTEGERs).
- * Add the overhead of ASN.1: up to (1+2) + 2 * (1+2+1) for the
- * types, lengths (represented by up to 2 bytes), and potential leading
- * zeros of the INTEGERs and the SEQUENCE. */
-#undef MBEDTLS_PK_SIGNATURE_MAX_SIZE
-#define MBEDTLS_PK_SIGNATURE_MAX_SIZE (PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE + 11)
-#endif
-#endif /* defined(MBEDTLS_USE_PSA_CRYPTO) */
-
-/* Internal helper to define which fields in the pk_context structure below
- * should be used for EC keys: legacy ecp_keypair or the raw (PSA friendly)
- * format. It should be noted that this only affects how data is stored, not
- * which functions are used for various operations. The overall picture looks
- * like this:
- * - if USE_PSA is not defined and ECP_C is defined then use ecp_keypair data
- *   structure and legacy functions
- * - if USE_PSA is defined and
- *     - if ECP_C then use ecp_keypair structure, convert data to a PSA friendly
- *       format and use PSA functions
- *     - if !ECP_C then use new raw data and PSA functions directly.
- *
- * The main reason for the "intermediate" (USE_PSA + ECP_C) above is that as long
- * as ECP_C is defined mbedtls_pk_ec() gives the user a read/write access to the
- * ecp_keypair structure inside the pk_context so they can modify it using
- * ECP functions which are not under PK module's control.
- */
-#if defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY) && \
-    !defined(MBEDTLS_ECP_C)
-#define MBEDTLS_PK_USE_PSA_EC_DATA
-#endif
-
-/* Helper symbol to state that the PK module has support for EC keys. This
- * can either be provided through the legacy ECP solution or through the
- * PSA friendly MBEDTLS_PK_USE_PSA_EC_DATA. */
-#if defined(MBEDTLS_PK_USE_PSA_EC_DATA) || defined(MBEDTLS_ECP_C)
-#define MBEDTLS_PK_HAVE_ECC_KEYS
-#endif /* MBEDTLS_PK_USE_PSA_EC_DATA || MBEDTLS_ECP_C */
-
-/**
- * \brief           Types for interfacing with the debug module
- */
-typedef enum {
-    MBEDTLS_PK_DEBUG_NONE = 0,
-    MBEDTLS_PK_DEBUG_MPI,
-    MBEDTLS_PK_DEBUG_ECP,
-    MBEDTLS_PK_DEBUG_PSA_EC,
-} mbedtls_pk_debug_type;
-
-/**
- * \brief           Item to send to the debug module
- */
-typedef struct mbedtls_pk_debug_item {
-    mbedtls_pk_debug_type MBEDTLS_PRIVATE(type);
-    const char *MBEDTLS_PRIVATE(name);
-    void *MBEDTLS_PRIVATE(value);
-} mbedtls_pk_debug_item;
-
-/** Maximum number of item send for debugging, plus 1 */
-#define MBEDTLS_PK_DEBUG_MAX_ITEMS 3
-
-/**
- * \brief           Public key information and operations
- *
- * \note        The library does not support custom pk info structures,
- *              only built-in structures returned by
- *              mbedtls_cipher_info_from_type().
- */
-typedef struct mbedtls_pk_info_t mbedtls_pk_info_t;
-
-#define MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN \
-    PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS)
-/**
- * \brief           Public key container
- */
-typedef struct mbedtls_pk_context {
-    const mbedtls_pk_info_t *MBEDTLS_PRIVATE(pk_info);    /**< Public key information         */
-    void *MBEDTLS_PRIVATE(pk_ctx);                        /**< Underlying public key context  */
-    /* The following field is used to store the ID of a private key in the
-     * following cases:
-     * - opaque key when MBEDTLS_PSA_CRYPTO_C is defined
-     * - normal key when MBEDTLS_PK_USE_PSA_EC_DATA is defined. In this case:
-     *    - the pk_ctx above is not not used to store the private key anymore.
-     *      Actually that field not populated at all in this case because also
-     *      the public key will be stored in raw format as explained below
-     *    - this ID is used for all private key operations (ex: sign, check
-     *      key pair, key write, etc) using PSA functions
-     *
-     * Note: this private key storing solution only affects EC keys, not the
-     *       other ones. The latters still use the pk_ctx to store their own
-     *       context.
-     *
-     * Note: this priv_id is guarded by MBEDTLS_PSA_CRYPTO_C and not by
-     *       MBEDTLS_PK_USE_PSA_EC_DATA (as the public counterpart below) because,
-     *       when working with opaque keys, it can be used also in
-     *       mbedtls_pk_sign_ext for RSA keys. */
-#if defined(MBEDTLS_PSA_CRYPTO_C)
-    mbedtls_svc_key_id_t MBEDTLS_PRIVATE(priv_id);      /**< Key ID for opaque keys */
-#endif /* MBEDTLS_PSA_CRYPTO_C */
-    /* The following fields are meant for storing the public key in raw format
-     * which is handy for:
-     * - easily importing it into the PSA context
-     * - reducing the ECP module dependencies in the PK one.
-     *
-     * When MBEDTLS_PK_USE_PSA_EC_DATA is enabled:
-     * - the pk_ctx above is not used anymore for storing the public key
-     *   inside the ecp_keypair structure
-     * - the following fields are used for all public key operations: signature
-     *   verify, key pair check and key write.
-     * Of course, when MBEDTLS_PK_USE_PSA_EC_DATA is not enabled, the legacy
-     * ecp_keypair structure is used for storing the public key and performing
-     * all the operations.
-     *
-     * Note: This new public key storing solution only works for EC keys, not
-     *       other ones. The latters still use pk_ctx to store their own
-     *       context.
-     */
-#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
-    uint8_t MBEDTLS_PRIVATE(pub_raw)[MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN]; /**< Raw public key   */
-    size_t MBEDTLS_PRIVATE(pub_raw_len);            /**< Valid bytes in "pub_raw" */
-    psa_ecc_family_t MBEDTLS_PRIVATE(ec_family);    /**< EC family of pk */
-    size_t MBEDTLS_PRIVATE(ec_bits);                /**< Curve's bits of pk */
-#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
-} mbedtls_pk_context;
-
-#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
-/**
- * \brief           Context for resuming operations
- */
-typedef struct {
-    const mbedtls_pk_info_t *MBEDTLS_PRIVATE(pk_info);    /**< Public key information         */
-    void *MBEDTLS_PRIVATE(rs_ctx);                        /**< Underlying restart context     */
-} mbedtls_pk_restart_ctx;
-#else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
-/* Now we can declare functions that take a pointer to that */
-typedef void mbedtls_pk_restart_ctx;
-#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
-
-#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
-/**
- * \brief           Types for RSA-alt abstraction
- */
-typedef int (*mbedtls_pk_rsa_alt_decrypt_func)(void *ctx, size_t *olen,
-                                               const unsigned char *input, unsigned char *output,
-                                               size_t output_max_len);
-typedef int (*mbedtls_pk_rsa_alt_sign_func)(void *ctx,
-                                            int (*f_rng)(void *, unsigned char *, size_t),
-                                            void *p_rng,
-                                            mbedtls_md_type_t md_alg, unsigned int hashlen,
-                                            const unsigned char *hash, unsigned char *sig);
-typedef size_t (*mbedtls_pk_rsa_alt_key_len_func)(void *ctx);
-#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
-
-/**
- * \brief           Return information associated with the given PK type
- *
- * \param pk_type   PK type to search for.
- *
- * \return          The PK info associated with the type or NULL if not found.
- */
-const mbedtls_pk_info_t *mbedtls_pk_info_from_type(mbedtls_pk_type_t pk_type);
-
-/**
- * \brief           Initialize a #mbedtls_pk_context (as NONE).
- *
- * \param ctx       The context to initialize.
- *                  This must not be \c NULL.
- */
-void mbedtls_pk_init(mbedtls_pk_context *ctx);
-
-/**
- * \brief           Free the components of a #mbedtls_pk_context.
- *
- * \param ctx       The context to clear. It must have been initialized.
- *                  If this is \c NULL, this function does nothing.
- *
- * \note            For contexts that have been set up with
- *                  mbedtls_pk_setup_opaque(), this does not free the underlying
- *                  PSA key and you still need to call psa_destroy_key()
- *                  independently if you want to destroy that key.
- */
-void mbedtls_pk_free(mbedtls_pk_context *ctx);
-
-#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
-/**
- * \brief           Initialize a restart context
- *
- * \param ctx       The context to initialize.
- *                  This must not be \c NULL.
- */
-void mbedtls_pk_restart_init(mbedtls_pk_restart_ctx *ctx);
-
-/**
- * \brief           Free the components of a restart context
- *
- * \param ctx       The context to clear. It must have been initialized.
- *                  If this is \c NULL, this function does nothing.
- */
-void mbedtls_pk_restart_free(mbedtls_pk_restart_ctx *ctx);
-#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
-
-/**
- * \brief           Initialize a PK context with the information given
- *                  and allocates the type-specific PK subcontext.
- *
- * \param ctx       Context to initialize. It must not have been set
- *                  up yet (type #MBEDTLS_PK_NONE).
- * \param info      Information to use
- *
- * \return          0 on success,
- *                  MBEDTLS_ERR_PK_BAD_INPUT_DATA on invalid input,
- *                  MBEDTLS_ERR_PK_ALLOC_FAILED on allocation failure.
- *
- * \note            For contexts holding an RSA-alt key, use
- *                  \c mbedtls_pk_setup_rsa_alt() instead.
- */
-int mbedtls_pk_setup(mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info);
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-/**
- * \brief           Initialize a PK context to wrap a PSA key.
- *
- * \note            This function replaces mbedtls_pk_setup() for contexts
- *                  that wrap a (possibly opaque) PSA key instead of
- *                  storing and manipulating the key material directly.
- *
- * \param ctx       The context to initialize. It must be empty (type NONE).
- * \param key       The PSA key to wrap, which must hold an ECC or RSA key
- *                  pair (see notes below).
- *
- * \note            The wrapped key must remain valid as long as the
- *                  wrapping PK context is in use, that is at least between
- *                  the point this function is called and the point
- *                  mbedtls_pk_free() is called on this context. The wrapped
- *                  key might then be independently used or destroyed.
- *
- * \note            This function is currently only available for ECC or RSA
- *                  key pairs (that is, keys containing private key material).
- *                  Support for other key types may be added later.
- *
- * \return          \c 0 on success.
- * \return          #MBEDTLS_ERR_PK_BAD_INPUT_DATA on invalid input
- *                  (context already used, invalid key identifier).
- * \return          #MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE if the key is not an
- *                  ECC key pair.
- * \return          #MBEDTLS_ERR_PK_ALLOC_FAILED on allocation failure.
- */
-int mbedtls_pk_setup_opaque(mbedtls_pk_context *ctx,
-                            const mbedtls_svc_key_id_t key);
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
-/**
- * \brief           Initialize an RSA-alt context
- *
- * \param ctx       Context to initialize. It must not have been set
- *                  up yet (type #MBEDTLS_PK_NONE).
- * \param key       RSA key pointer
- * \param decrypt_func  Decryption function
- * \param sign_func     Signing function
- * \param key_len_func  Function returning key length in bytes
- *
- * \return          0 on success, or MBEDTLS_ERR_PK_BAD_INPUT_DATA if the
- *                  context wasn't already initialized as RSA_ALT.
- *
- * \note            This function replaces \c mbedtls_pk_setup() for RSA-alt.
- */
-int mbedtls_pk_setup_rsa_alt(mbedtls_pk_context *ctx, void *key,
-                             mbedtls_pk_rsa_alt_decrypt_func decrypt_func,
-                             mbedtls_pk_rsa_alt_sign_func sign_func,
-                             mbedtls_pk_rsa_alt_key_len_func key_len_func);
-#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
-
-/**
- * \brief           Get the size in bits of the underlying key
- *
- * \param ctx       The context to query. It must have been initialized.
- *
- * \return          Key size in bits, or 0 on error
- */
-size_t mbedtls_pk_get_bitlen(const mbedtls_pk_context *ctx);
-
-/**
- * \brief           Get the length in bytes of the underlying key
- *
- * \param ctx       The context to query. It must have been initialized.
- *
- * \return          Key length in bytes, or 0 on error
- */
-static inline size_t mbedtls_pk_get_len(const mbedtls_pk_context *ctx)
-{
-    return (mbedtls_pk_get_bitlen(ctx) + 7) / 8;
-}
-
-/**
- * \brief           Tell if a context can do the operation given by type
- *
- * \param ctx       The context to query. It must have been initialized.
- * \param type      The desired type.
- *
- * \return          1 if the context can do operations on the given type.
- * \return          0 if the context cannot do the operations on the given
- *                  type. This is always the case for a context that has
- *                  been initialized but not set up, or that has been
- *                  cleared with mbedtls_pk_free().
- */
-int mbedtls_pk_can_do(const mbedtls_pk_context *ctx, mbedtls_pk_type_t type);
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-/**
- * \brief           Tell if context can do the operation given by PSA algorithm
- *
- * \param ctx       The context to query. It must have been initialized.
- * \param alg       PSA algorithm to check against, the following are allowed:
- *                  PSA_ALG_RSA_PKCS1V15_SIGN(hash),
- *                  PSA_ALG_RSA_PSS(hash),
- *                  PSA_ALG_RSA_PKCS1V15_CRYPT,
- *                  PSA_ALG_ECDSA(hash),
- *                  PSA_ALG_ECDH, where hash is a specific hash.
- * \param usage  PSA usage flag to check against, must be composed of:
- *                  PSA_KEY_USAGE_SIGN_HASH
- *                  PSA_KEY_USAGE_DECRYPT
- *                  PSA_KEY_USAGE_DERIVE.
- *                  Context key must match all passed usage flags.
- *
- * \warning         Since the set of allowed algorithms and usage flags may be
- *                  expanded in the future, the return value \c 0 should not
- *                  be taken in account for non-allowed algorithms and usage
- *                  flags.
- *
- * \return          1 if the context can do operations on the given type.
- * \return          0 if the context cannot do the operations on the given
- *                  type, for non-allowed algorithms and usage flags, or
- *                  for a context that has been initialized but not set up
- *                  or that has been cleared with mbedtls_pk_free().
- */
-int mbedtls_pk_can_do_ext(const mbedtls_pk_context *ctx, psa_algorithm_t alg,
-                          psa_key_usage_t usage);
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-/**
- * \brief           Verify signature (including padding if relevant).
- *
- * \param ctx       The PK context to use. It must have been set up.
- * \param md_alg    Hash algorithm used.
- *                  This can be #MBEDTLS_MD_NONE if the signature algorithm
- *                  does not rely on a hash algorithm (non-deterministic
- *                  ECDSA, RSA PKCS#1 v1.5).
- *                  For PKCS#1 v1.5, if \p md_alg is #MBEDTLS_MD_NONE, then
- *                  \p hash is the DigestInfo structure used by RFC 8017
- *                  &sect;9.2 steps 3&ndash;6. If \p md_alg is a valid hash
- *                  algorithm then \p hash is the digest itself, and this
- *                  function calculates the DigestInfo encoding internally.
- * \param hash      Hash of the message to sign
- * \param hash_len  Hash length
- * \param sig       Signature to verify
- * \param sig_len   Signature length
- *
- * \return          0 on success (signature is valid),
- *                  #MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if there is a valid
- *                  signature in \p sig but its length is less than \p sig_len,
- *                  or a specific error code.
- *
- * \note            For RSA keys, the default padding type is PKCS#1 v1.5.
- *                  Use \c mbedtls_pk_verify_ext( MBEDTLS_PK_RSASSA_PSS, ... )
- *                  to verify RSASSA_PSS signatures.
- */
-int mbedtls_pk_verify(mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
-                      const unsigned char *hash, size_t hash_len,
-                      const unsigned char *sig, size_t sig_len);
-
-/**
- * \brief           Restartable version of \c mbedtls_pk_verify()
- *
- * \note            Performs the same job as \c mbedtls_pk_verify(), but can
- *                  return early and restart according to the limit set with
- *                  \c mbedtls_ecp_set_max_ops() to reduce blocking for ECC
- *                  operations. For RSA, same as \c mbedtls_pk_verify().
- *
- * \param ctx       The PK context to use. It must have been set up.
- * \param md_alg    Hash algorithm used (see notes)
- * \param hash      Hash of the message to sign
- * \param hash_len  Hash length or 0 (see notes)
- * \param sig       Signature to verify
- * \param sig_len   Signature length
- * \param rs_ctx    Restart context (NULL to disable restart)
- *
- * \return          See \c mbedtls_pk_verify(), or
- * \return          #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
- *                  operations was reached: see \c mbedtls_ecp_set_max_ops().
- */
-int mbedtls_pk_verify_restartable(mbedtls_pk_context *ctx,
-                                  mbedtls_md_type_t md_alg,
-                                  const unsigned char *hash, size_t hash_len,
-                                  const unsigned char *sig, size_t sig_len,
-                                  mbedtls_pk_restart_ctx *rs_ctx);
-
-/**
- * \brief           Verify signature, with options.
- *                  (Includes verification of the padding depending on type.)
- *
- * \param type      Signature type (inc. possible padding type) to verify
- * \param options   Pointer to type-specific options, or NULL
- * \param ctx       The PK context to use. It must have been set up.
- * \param md_alg    Hash algorithm used (see notes)
- * \param hash      Hash of the message to sign
- * \param hash_len  Hash length or 0 (see notes)
- * \param sig       Signature to verify
- * \param sig_len   Signature length
- *
- * \return          0 on success (signature is valid),
- *                  #MBEDTLS_ERR_PK_TYPE_MISMATCH if the PK context can't be
- *                  used for this type of signatures,
- *                  #MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if there is a valid
- *                  signature in \p sig but its length is less than \p sig_len,
- *                  or a specific error code.
- *
- * \note            If hash_len is 0, then the length associated with md_alg
- *                  is used instead, or an error returned if it is invalid.
- *
- * \note            md_alg may be MBEDTLS_MD_NONE, only if hash_len != 0
- *
- * \note            If type is MBEDTLS_PK_RSASSA_PSS, then options must point
- *                  to a mbedtls_pk_rsassa_pss_options structure,
- *                  otherwise it must be NULL. Note that if
- *                  #MBEDTLS_USE_PSA_CRYPTO is defined, the salt length is not
- *                  verified as PSA_ALG_RSA_PSS_ANY_SALT is used.
- */
-int mbedtls_pk_verify_ext(mbedtls_pk_type_t type, const void *options,
-                          mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
-                          const unsigned char *hash, size_t hash_len,
-                          const unsigned char *sig, size_t sig_len);
-
-/**
- * \brief           Make signature, including padding if relevant.
- *
- * \param ctx       The PK context to use. It must have been set up
- *                  with a private key.
- * \param md_alg    Hash algorithm used (see notes)
- * \param hash      Hash of the message to sign
- * \param hash_len  Hash length
- * \param sig       Place to write the signature.
- *                  It must have enough room for the signature.
- *                  #MBEDTLS_PK_SIGNATURE_MAX_SIZE is always enough.
- *                  You may use a smaller buffer if it is large enough
- *                  given the key type.
- * \param sig_size  The size of the \p sig buffer in bytes.
- * \param sig_len   On successful return,
- *                  the number of bytes written to \p sig.
- * \param f_rng     RNG function, must not be \c NULL.
- * \param p_rng     RNG parameter
- *
- * \return          0 on success, or a specific error code.
- *
- * \note            For RSA keys, the default padding type is PKCS#1 v1.5.
- *                  There is no interface in the PK module to make RSASSA-PSS
- *                  signatures yet.
- *
- * \note            For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0.
- *                  For ECDSA, md_alg may never be MBEDTLS_MD_NONE.
- */
-int mbedtls_pk_sign(mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
-                    const unsigned char *hash, size_t hash_len,
-                    unsigned char *sig, size_t sig_size, size_t *sig_len,
-                    int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
-
-#if defined(MBEDTLS_PSA_CRYPTO_C)
-/**
- * \brief           Make signature given a signature type.
- *
- * \param pk_type   Signature type.
- * \param ctx       The PK context to use. It must have been set up
- *                  with a private key.
- * \param md_alg    Hash algorithm used (see notes)
- * \param hash      Hash of the message to sign
- * \param hash_len  Hash length
- * \param sig       Place to write the signature.
- *                  It must have enough room for the signature.
- *                  #MBEDTLS_PK_SIGNATURE_MAX_SIZE is always enough.
- *                  You may use a smaller buffer if it is large enough
- *                  given the key type.
- * \param sig_size  The size of the \p sig buffer in bytes.
- * \param sig_len   On successful return,
- *                  the number of bytes written to \p sig.
- * \param f_rng     RNG function, must not be \c NULL.
- * \param p_rng     RNG parameter
- *
- * \return          0 on success, or a specific error code.
- *
- * \note            When \p pk_type is #MBEDTLS_PK_RSASSA_PSS,
- *                  see #PSA_ALG_RSA_PSS for a description of PSS options used.
- *
- * \note            For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0.
- *                  For ECDSA, md_alg may never be MBEDTLS_MD_NONE.
- *
- */
-int mbedtls_pk_sign_ext(mbedtls_pk_type_t pk_type,
-                        mbedtls_pk_context *ctx,
-                        mbedtls_md_type_t md_alg,
-                        const unsigned char *hash, size_t hash_len,
-                        unsigned char *sig, size_t sig_size, size_t *sig_len,
-                        int (*f_rng)(void *, unsigned char *, size_t),
-                        void *p_rng);
-#endif /* MBEDTLS_PSA_CRYPTO_C */
-
-/**
- * \brief           Restartable version of \c mbedtls_pk_sign()
- *
- * \note            Performs the same job as \c mbedtls_pk_sign(), but can
- *                  return early and restart according to the limit set with
- *                  \c mbedtls_ecp_set_max_ops() to reduce blocking for ECC
- *                  operations. For RSA, same as \c mbedtls_pk_sign().
- *
- * \param ctx       The PK context to use. It must have been set up
- *                  with a private key.
- * \param md_alg    Hash algorithm used (see notes for mbedtls_pk_sign())
- * \param hash      Hash of the message to sign
- * \param hash_len  Hash length
- * \param sig       Place to write the signature.
- *                  It must have enough room for the signature.
- *                  #MBEDTLS_PK_SIGNATURE_MAX_SIZE is always enough.
- *                  You may use a smaller buffer if it is large enough
- *                  given the key type.
- * \param sig_size  The size of the \p sig buffer in bytes.
- * \param sig_len   On successful return,
- *                  the number of bytes written to \p sig.
- * \param f_rng     RNG function, must not be \c NULL.
- * \param p_rng     RNG parameter
- * \param rs_ctx    Restart context (NULL to disable restart)
- *
- * \return          See \c mbedtls_pk_sign().
- * \return          #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
- *                  operations was reached: see \c mbedtls_ecp_set_max_ops().
- */
-int mbedtls_pk_sign_restartable(mbedtls_pk_context *ctx,
-                                mbedtls_md_type_t md_alg,
-                                const unsigned char *hash, size_t hash_len,
-                                unsigned char *sig, size_t sig_size, size_t *sig_len,
-                                int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
-                                mbedtls_pk_restart_ctx *rs_ctx);
-
-/**
- * \brief           Decrypt message (including padding if relevant).
- *
- * \param ctx       The PK context to use. It must have been set up
- *                  with a private key.
- * \param input     Input to decrypt
- * \param ilen      Input size
- * \param output    Decrypted output
- * \param olen      Decrypted message length
- * \param osize     Size of the output buffer
- * \param f_rng     RNG function, must not be \c NULL.
- * \param p_rng     RNG parameter
- *
- * \note            For RSA keys, the default padding type is PKCS#1 v1.5.
- *
- * \return          0 on success, or a specific error code.
- */
-int mbedtls_pk_decrypt(mbedtls_pk_context *ctx,
-                       const unsigned char *input, size_t ilen,
-                       unsigned char *output, size_t *olen, size_t osize,
-                       int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
-
-/**
- * \brief           Encrypt message (including padding if relevant).
- *
- * \param ctx       The PK context to use. It must have been set up.
- * \param input     Message to encrypt
- * \param ilen      Message size
- * \param output    Encrypted output
- * \param olen      Encrypted output length
- * \param osize     Size of the output buffer
- * \param f_rng     RNG function, must not be \c NULL.
- * \param p_rng     RNG parameter
- *
- * \note            \p f_rng is used for padding generation.
- *
- * \note            For RSA keys, the default padding type is PKCS#1 v1.5.
- *
- * \return          0 on success, or a specific error code.
- */
-int mbedtls_pk_encrypt(mbedtls_pk_context *ctx,
-                       const unsigned char *input, size_t ilen,
-                       unsigned char *output, size_t *olen, size_t osize,
-                       int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
-
-/**
- * \brief           Check if a public-private pair of keys matches.
- *
- * \param pub       Context holding a public key.
- * \param prv       Context holding a private (and public) key.
- * \param f_rng     RNG function, must not be \c NULL.
- * \param p_rng     RNG parameter
- *
- * \return          \c 0 on success (keys were checked and match each other).
- * \return          #MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE if the keys could not
- *                  be checked - in that case they may or may not match.
- * \return          #MBEDTLS_ERR_PK_BAD_INPUT_DATA if a context is invalid.
- * \return          Another non-zero value if the keys do not match.
- */
-int mbedtls_pk_check_pair(const mbedtls_pk_context *pub,
-                          const mbedtls_pk_context *prv,
-                          int (*f_rng)(void *, unsigned char *, size_t),
-                          void *p_rng);
-
-/**
- * \brief           Export debug information
- *
- * \param ctx       The PK context to use. It must have been initialized.
- * \param items     Place to write debug items
- *
- * \return          0 on success or MBEDTLS_ERR_PK_BAD_INPUT_DATA
- */
-int mbedtls_pk_debug(const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items);
-
-/**
- * \brief           Access the type name
- *
- * \param ctx       The PK context to use. It must have been initialized.
- *
- * \return          Type name on success, or "invalid PK"
- */
-const char *mbedtls_pk_get_name(const mbedtls_pk_context *ctx);
-
-/**
- * \brief           Get the key type
- *
- * \param ctx       The PK context to use. It must have been initialized.
- *
- * \return          Type on success.
- * \return          #MBEDTLS_PK_NONE for a context that has not been set up.
- */
-mbedtls_pk_type_t mbedtls_pk_get_type(const mbedtls_pk_context *ctx);
-
-#if defined(MBEDTLS_RSA_C)
-/**
- * Quick access to an RSA context inside a PK context.
- *
- * \warning This function can only be used when the type of the context, as
- * returned by mbedtls_pk_get_type(), is #MBEDTLS_PK_RSA.
- * Ensuring that is the caller's responsibility.
- * Alternatively, you can check whether this function returns NULL.
- *
- * \return The internal RSA context held by the PK context, or NULL.
- */
-static inline mbedtls_rsa_context *mbedtls_pk_rsa(const mbedtls_pk_context pk)
-{
-    switch (mbedtls_pk_get_type(&pk)) {
-        case MBEDTLS_PK_RSA:
-            return (mbedtls_rsa_context *) (pk).MBEDTLS_PRIVATE(pk_ctx);
-        default:
-            return NULL;
-    }
-}
-#endif /* MBEDTLS_RSA_C */
-
-#if defined(MBEDTLS_ECP_C)
-/**
- * Quick access to an EC context inside a PK context.
- *
- * \warning This function can only be used when the type of the context, as
- * returned by mbedtls_pk_get_type(), is #MBEDTLS_PK_ECKEY,
- * #MBEDTLS_PK_ECKEY_DH, or #MBEDTLS_PK_ECDSA.
- * Ensuring that is the caller's responsibility.
- * Alternatively, you can check whether this function returns NULL.
- *
- * \return The internal EC context held by the PK context, or NULL.
- */
-static inline mbedtls_ecp_keypair *mbedtls_pk_ec(const mbedtls_pk_context pk)
-{
-    switch (mbedtls_pk_get_type(&pk)) {
-        case MBEDTLS_PK_ECKEY:
-        case MBEDTLS_PK_ECKEY_DH:
-        case MBEDTLS_PK_ECDSA:
-            return (mbedtls_ecp_keypair *) (pk).MBEDTLS_PRIVATE(pk_ctx);
-        default:
-            return NULL;
-    }
-}
-#endif /* MBEDTLS_ECP_C */
-
-#if defined(MBEDTLS_PK_PARSE_C)
-/** \ingroup pk_module */
-/**
- * \brief           Parse a private key in PEM or DER format
- *
- * \note            If #MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto
- *                  subsystem must have been initialized by calling
- *                  psa_crypto_init() before calling this function.
- *
- * \param ctx       The PK context to fill. It must have been initialized
- *                  but not set up.
- * \param key       Input buffer to parse.
- *                  The buffer must contain the input exactly, with no
- *                  extra trailing material. For PEM, the buffer must
- *                  contain a null-terminated string.
- * \param keylen    Size of \b key in bytes.
- *                  For PEM data, this includes the terminating null byte,
- *                  so \p keylen must be equal to `strlen(key) + 1`.
- * \param pwd       Optional password for decryption.
- *                  Pass \c NULL if expecting a non-encrypted key.
- *                  Pass a string of \p pwdlen bytes if expecting an encrypted
- *                  key; a non-encrypted key will also be accepted.
- *                  The empty password is not supported.
- * \param pwdlen    Size of the password in bytes.
- *                  Ignored if \p pwd is \c NULL.
- * \param f_rng     RNG function, must not be \c NULL. Used for blinding.
- * \param p_rng     RNG parameter
- *
- * \note            On entry, ctx must be empty, either freshly initialised
- *                  with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
- *                  specific key type, check the result with mbedtls_pk_can_do().
- *
- * \note            The key is also checked for correctness.
- *
- * \return          0 if successful, or a specific PK or PEM error code
- */
-int mbedtls_pk_parse_key(mbedtls_pk_context *ctx,
-                         const unsigned char *key, size_t keylen,
-                         const unsigned char *pwd, size_t pwdlen,
-                         int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
-
-/** \ingroup pk_module */
-/**
- * \brief           Parse a public key in PEM or DER format
- *
- * \note            If #MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto
- *                  subsystem must have been initialized by calling
- *                  psa_crypto_init() before calling this function.
- *
- * \param ctx       The PK context to fill. It must have been initialized
- *                  but not set up.
- * \param key       Input buffer to parse.
- *                  The buffer must contain the input exactly, with no
- *                  extra trailing material. For PEM, the buffer must
- *                  contain a null-terminated string.
- * \param keylen    Size of \b key in bytes.
- *                  For PEM data, this includes the terminating null byte,
- *                  so \p keylen must be equal to `strlen(key) + 1`.
- *
- * \note            On entry, ctx must be empty, either freshly initialised
- *                  with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
- *                  specific key type, check the result with mbedtls_pk_can_do().
- *
- * \note            For compressed points, see #MBEDTLS_ECP_PF_COMPRESSED for
- *                  limitations.
- *
- * \note            The key is also checked for correctness.
- *
- * \return          0 if successful, or a specific PK or PEM error code
- */
-int mbedtls_pk_parse_public_key(mbedtls_pk_context *ctx,
-                                const unsigned char *key, size_t keylen);
-
-#if defined(MBEDTLS_FS_IO)
-/** \ingroup pk_module */
-/**
- * \brief           Load and parse a private key
- *
- * \note            If #MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto
- *                  subsystem must have been initialized by calling
- *                  psa_crypto_init() before calling this function.
- *
- * \param ctx       The PK context to fill. It must have been initialized
- *                  but not set up.
- * \param path      filename to read the private key from
- * \param password  Optional password to decrypt the file.
- *                  Pass \c NULL if expecting a non-encrypted key.
- *                  Pass a null-terminated string if expecting an encrypted
- *                  key; a non-encrypted key will also be accepted.
- *                  The empty password is not supported.
- * \param f_rng     RNG function, must not be \c NULL. Used for blinding.
- * \param p_rng     RNG parameter
- *
- * \note            On entry, ctx must be empty, either freshly initialised
- *                  with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
- *                  specific key type, check the result with mbedtls_pk_can_do().
- *
- * \note            The key is also checked for correctness.
- *
- * \return          0 if successful, or a specific PK or PEM error code
- */
-int mbedtls_pk_parse_keyfile(mbedtls_pk_context *ctx,
-                             const char *path, const char *password,
-                             int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
-
-/** \ingroup pk_module */
-/**
- * \brief           Load and parse a public key
- *
- * \param ctx       The PK context to fill. It must have been initialized
- *                  but not set up.
- * \param path      filename to read the public key from
- *
- * \note            On entry, ctx must be empty, either freshly initialised
- *                  with mbedtls_pk_init() or reset with mbedtls_pk_free(). If
- *                  you need a specific key type, check the result with
- *                  mbedtls_pk_can_do().
- *
- * \note            The key is also checked for correctness.
- *
- * \return          0 if successful, or a specific PK or PEM error code
- */
-int mbedtls_pk_parse_public_keyfile(mbedtls_pk_context *ctx, const char *path);
-#endif /* MBEDTLS_FS_IO */
-#endif /* MBEDTLS_PK_PARSE_C */
-
-#if defined(MBEDTLS_PK_WRITE_C)
-/**
- * \brief           Write a private key to a PKCS#1 or SEC1 DER structure
- *                  Note: data is written at the end of the buffer! Use the
- *                        return value to determine where you should start
- *                        using the buffer
- *
- * \param ctx       PK context which must contain a valid private key.
- * \param buf       buffer to write to
- * \param size      size of the buffer
- *
- * \return          length of data written if successful, or a specific
- *                  error code
- */
-int mbedtls_pk_write_key_der(const mbedtls_pk_context *ctx, unsigned char *buf, size_t size);
-
-/**
- * \brief           Write a public key to a SubjectPublicKeyInfo DER structure
- *                  Note: data is written at the end of the buffer! Use the
- *                        return value to determine where you should start
- *                        using the buffer
- *
- * \param ctx       PK context which must contain a valid public or private key.
- * \param buf       buffer to write to
- * \param size      size of the buffer
- *
- * \return          length of data written if successful, or a specific
- *                  error code
- */
-int mbedtls_pk_write_pubkey_der(const mbedtls_pk_context *ctx, unsigned char *buf, size_t size);
-
-#if defined(MBEDTLS_PEM_WRITE_C)
-/**
- * \brief           Write a public key to a PEM string
- *
- * \param ctx       PK context which must contain a valid public or private key.
- * \param buf       Buffer to write to. The output includes a
- *                  terminating null byte.
- * \param size      Size of the buffer in bytes.
- *
- * \return          0 if successful, or a specific error code
- */
-int mbedtls_pk_write_pubkey_pem(const mbedtls_pk_context *ctx, unsigned char *buf, size_t size);
-
-/**
- * \brief           Write a private key to a PKCS#1 or SEC1 PEM string
- *
- * \param ctx       PK context which must contain a valid private key.
- * \param buf       Buffer to write to. The output includes a
- *                  terminating null byte.
- * \param size      Size of the buffer in bytes.
- *
- * \return          0 if successful, or a specific error code
- */
-int mbedtls_pk_write_key_pem(const mbedtls_pk_context *ctx, unsigned char *buf, size_t size);
-#endif /* MBEDTLS_PEM_WRITE_C */
-#endif /* MBEDTLS_PK_WRITE_C */
-
-/*
- * WARNING: Low-level functions. You probably do not want to use these unless
- *          you are certain you do ;)
- */
-
-#if defined(MBEDTLS_PK_PARSE_C)
-/**
- * \brief           Parse a SubjectPublicKeyInfo DER structure
- *
- * \param p         the position in the ASN.1 data
- * \param end       end of the buffer
- * \param pk        The PK context to fill. It must have been initialized
- *                  but not set up.
- *
- * \return          0 if successful, or a specific PK error code
- */
-int mbedtls_pk_parse_subpubkey(unsigned char **p, const unsigned char *end,
-                               mbedtls_pk_context *pk);
-#endif /* MBEDTLS_PK_PARSE_C */
-
-#if defined(MBEDTLS_PK_WRITE_C)
-/**
- * \brief           Write a subjectPublicKey to ASN.1 data
- *                  Note: function works backwards in data buffer
- *
- * \param p         reference to current position pointer
- * \param start     start of the buffer (for bounds-checking)
- * \param key       PK context which must contain a valid public or private key.
- *
- * \return          the length written or a negative error code
- */
-int mbedtls_pk_write_pubkey(unsigned char **p, unsigned char *start,
-                            const mbedtls_pk_context *key);
-#endif /* MBEDTLS_PK_WRITE_C */
-
-/*
- * Internal module functions. You probably do not want to use these unless you
- * know you do.
- */
-#if defined(MBEDTLS_FS_IO)
-int mbedtls_pk_load_file(const char *path, unsigned char **buf, size_t *n);
-#endif
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-/**
- * \brief           Turn an EC or RSA key into an opaque one.
- *
- * \warning         This is a temporary utility function for tests. It might
- *                  change or be removed at any time without notice.
- *
- * \param pk        Input: the EC or RSA key to import to a PSA key.
- *                  Output: a PK context wrapping that PSA key.
- * \param key       Output: a PSA key identifier.
- *                  It's the caller's responsibility to call
- *                  psa_destroy_key() on that key identifier after calling
- *                  mbedtls_pk_free() on the PK context.
- * \param alg       The algorithm to allow for use with that key.
- * \param usage     The usage to allow for use with that key.
- * \param alg2      The secondary algorithm to allow for use with that key.
- *
- * \return          \c 0 if successful.
- * \return          An Mbed TLS error code otherwise.
- */
-int mbedtls_pk_wrap_as_opaque(mbedtls_pk_context *pk,
-                              mbedtls_svc_key_id_t *key,
-                              psa_algorithm_t alg,
-                              psa_key_usage_t usage,
-                              psa_algorithm_t alg2);
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* MBEDTLS_PK_H */