refactor!: MbedTLS on Windows, switch to uint32

1 files changed, 671 insertions, 0 deletions

diff --git a/vendor/mbedtls/ecdsa.h b/vendor/mbedtls/ecdsa.h
new file mode 100644
index 0000000..2ecf349
--- /dev/null
+++ b/vendor/mbedtls/ecdsa.h
@@ -0,0 +1,671 @@
+/**
+ * \file ecdsa.h
+ *
+ * \brief This file contains ECDSA definitions and functions.
+ *
+ * The Elliptic Curve Digital Signature Algorithm (ECDSA) is defined in
+ * <em>Standards for Efficient Cryptography Group (SECG):
+ * SEC1 Elliptic Curve Cryptography</em>.
+ * The use of ECDSA for TLS is defined in <em>RFC-4492: Elliptic Curve
+ * Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)</em>.
+ *
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#ifndef MBEDTLS_ECDSA_H
+#define MBEDTLS_ECDSA_H
+#include "mbedtls/private_access.h"
+
+#include "mbedtls/build_info.h"
+
+#include "mbedtls/ecp.h"
+#include "mbedtls/md.h"
+
+/**
+ * \brief           Maximum ECDSA signature size for a given curve bit size
+ *
+ * \param bits      Curve size in bits
+ * \return          Maximum signature size in bytes
+ *
+ * \note            This macro returns a compile-time constant if its argument
+ *                  is one. It may evaluate its argument multiple times.
+ */
+/*
+ *     Ecdsa-Sig-Value ::= SEQUENCE {
+ *         r       INTEGER,
+ *         s       INTEGER
+ *     }
+ *
+ * For each of r and s, the value (V) may include an extra initial "0" bit.
+ */
+#define MBEDTLS_ECDSA_MAX_SIG_LEN(bits)                               \
+    (/*T,L of SEQUENCE*/ ((bits) >= 61 * 8 ? 3 : 2) +              \
+     /*T,L of r,s*/ 2 * (((bits) >= 127 * 8 ? 3 : 2) +     \
+                         /*V of r,s*/ ((bits) + 8) / 8))
+
+/** The maximal size of an ECDSA signature in Bytes. */
+#define MBEDTLS_ECDSA_MAX_LEN  MBEDTLS_ECDSA_MAX_SIG_LEN(MBEDTLS_ECP_MAX_BITS)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief           The ECDSA context structure.
+ *
+ * \warning         Performing multiple operations concurrently on the same
+ *                  ECDSA context is not supported; objects of this type
+ *                  should not be shared between multiple threads.
+ *
+ * \note            pk_wrap module assumes that "ecdsa_context" is identical
+ *                  to "ecp_keypair" (see for example structure
+ *                  "mbedtls_eckey_info" where ECDSA sign/verify functions
+ *                  are used also for EC key)
+ */
+typedef mbedtls_ecp_keypair mbedtls_ecdsa_context;
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+
+/**
+ * \brief           Internal restart context for ecdsa_verify()
+ *
+ * \note            Opaque struct, defined in ecdsa.c
+ */
+typedef struct mbedtls_ecdsa_restart_ver mbedtls_ecdsa_restart_ver_ctx;
+
+/**
+ * \brief           Internal restart context for ecdsa_sign()
+ *
+ * \note            Opaque struct, defined in ecdsa.c
+ */
+typedef struct mbedtls_ecdsa_restart_sig mbedtls_ecdsa_restart_sig_ctx;
+
+#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
+/**
+ * \brief           Internal restart context for ecdsa_sign_det()
+ *
+ * \note            Opaque struct, defined in ecdsa.c
+ */
+typedef struct mbedtls_ecdsa_restart_det mbedtls_ecdsa_restart_det_ctx;
+#endif
+
+/**
+ * \brief           General context for resuming ECDSA operations
+ */
+typedef struct {
+    mbedtls_ecp_restart_ctx MBEDTLS_PRIVATE(ecp);        /*!<  base context for ECP restart and
+                                                            shared administrative info    */
+    mbedtls_ecdsa_restart_ver_ctx *MBEDTLS_PRIVATE(ver); /*!<  ecdsa_verify() sub-context    */
+    mbedtls_ecdsa_restart_sig_ctx *MBEDTLS_PRIVATE(sig); /*!<  ecdsa_sign() sub-context      */
+#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
+    mbedtls_ecdsa_restart_det_ctx *MBEDTLS_PRIVATE(det); /*!<  ecdsa_sign_det() sub-context  */
+#endif
+} mbedtls_ecdsa_restart_ctx;
+
+#else /* MBEDTLS_ECP_RESTARTABLE */
+
+/* Now we can declare functions that take a pointer to that */
+typedef void mbedtls_ecdsa_restart_ctx;
+
+#endif /* MBEDTLS_ECP_RESTARTABLE */
+
+/**
+ * \brief          This function checks whether a given group can be used
+ *                 for ECDSA.
+ *
+ * \param gid      The ECP group ID to check.
+ *
+ * \return         \c 1 if the group can be used, \c 0 otherwise
+ */
+int mbedtls_ecdsa_can_do(mbedtls_ecp_group_id gid);
+
+/**
+ * \brief           This function computes the ECDSA signature of a
+ *                  previously-hashed message.
+ *
+ * \note            The deterministic version implemented in
+ *                  mbedtls_ecdsa_sign_det_ext() is usually preferred.
+ *
+ * \note            If the bitlength of the message hash is larger than the
+ *                  bitlength of the group order, then the hash is truncated
+ *                  as defined in <em>Standards for Efficient Cryptography Group
+ *                  (SECG): SEC1 Elliptic Curve Cryptography</em>, section
+ *                  4.1.3, step 5.
+ *
+ * \see             ecp.h
+ *
+ * \param grp       The context for the elliptic curve to use.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param r         The MPI context in which to store the first part
+ *                  the signature. This must be initialized.
+ * \param s         The MPI context in which to store the second part
+ *                  the signature. This must be initialized.
+ * \param d         The private signing key. This must be initialized.
+ * \param buf       The content to be signed. This is usually the hash of
+ *                  the original data to be signed. This must be a readable
+ *                  buffer of length \p blen Bytes. It may be \c NULL if
+ *                  \p blen is zero.
+ * \param blen      The length of \p buf in Bytes.
+ * \param f_rng     The RNG function. This must not be \c NULL.
+ * \param p_rng     The RNG context to be passed to \p f_rng. This may be
+ *                  \c NULL if \p f_rng doesn't need a context parameter.
+ *
+ * \return          \c 0 on success.
+ * \return          An \c MBEDTLS_ERR_ECP_XXX
+ *                  or \c MBEDTLS_MPI_XXX error code on failure.
+ */
+int mbedtls_ecdsa_sign(mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
+                       const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
+                       int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
+
+#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
+/**
+ * \brief           This function computes the ECDSA signature of a
+ *                  previously-hashed message, deterministic version.
+ *
+ *                  For more information, see <em>RFC-6979: Deterministic
+ *                  Usage of the Digital Signature Algorithm (DSA) and Elliptic
+ *                  Curve Digital Signature Algorithm (ECDSA)</em>.
+ *
+ * \note            If the bitlength of the message hash is larger than the
+ *                  bitlength of the group order, then the hash is truncated as
+ *                  defined in <em>Standards for Efficient Cryptography Group
+ *                  (SECG): SEC1 Elliptic Curve Cryptography</em>, section
+ *                  4.1.3, step 5.
+ *
+ * \see             ecp.h
+ *
+ * \param grp           The context for the elliptic curve to use.
+ *                      This must be initialized and have group parameters
+ *                      set, for example through mbedtls_ecp_group_load().
+ * \param r             The MPI context in which to store the first part
+ *                      the signature. This must be initialized.
+ * \param s             The MPI context in which to store the second part
+ *                      the signature. This must be initialized.
+ * \param d             The private signing key. This must be initialized
+ *                      and setup, for example through mbedtls_ecp_gen_privkey().
+ * \param buf           The hashed content to be signed. This must be a readable
+ *                      buffer of length \p blen Bytes. It may be \c NULL if
+ *                      \p blen is zero.
+ * \param blen          The length of \p buf in Bytes.
+ * \param md_alg        The hash algorithm used to hash the original data.
+ * \param f_rng_blind   The RNG function used for blinding. This must not be
+ *                      \c NULL.
+ * \param p_rng_blind   The RNG context to be passed to \p f_rng_blind. This
+ *                      may be \c NULL if \p f_rng_blind doesn't need a context
+ *                      parameter.
+ *
+ * \return          \c 0 on success.
+ * \return          An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
+ *                  error code on failure.
+ */
+int mbedtls_ecdsa_sign_det_ext(mbedtls_ecp_group *grp, mbedtls_mpi *r,
+                               mbedtls_mpi *s, const mbedtls_mpi *d,
+                               const unsigned char *buf, size_t blen,
+                               mbedtls_md_type_t md_alg,
+                               int (*f_rng_blind)(void *, unsigned char *, size_t),
+                               void *p_rng_blind);
+#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
+
+#if !defined(MBEDTLS_ECDSA_SIGN_ALT)
+/**
+ * \brief               This function computes the ECDSA signature of a
+ *                      previously-hashed message, in a restartable way.
+ *
+ * \note                The deterministic version implemented in
+ *                      mbedtls_ecdsa_sign_det_restartable() is usually
+ *                      preferred.
+ *
+ * \note                This function is like \c mbedtls_ecdsa_sign() but
+ *                      it can return early and restart according to the
+ *                      limit set with \c mbedtls_ecp_set_max_ops() to
+ *                      reduce blocking.
+ *
+ * \note                If the bitlength of the message hash is larger
+ *                      than the bitlength of the group order, then the
+ *                      hash is truncated as defined in <em>Standards for
+ *                      Efficient Cryptography Group (SECG): SEC1 Elliptic
+ *                      Curve Cryptography</em>, section 4.1.3, step 5.
+ *
+ * \see                 ecp.h
+ *
+ * \param grp           The context for the elliptic curve to use.
+ *                      This must be initialized and have group parameters
+ *                      set, for example through mbedtls_ecp_group_load().
+ * \param r             The MPI context in which to store the first part
+ *                      the signature. This must be initialized.
+ * \param s             The MPI context in which to store the second part
+ *                      the signature. This must be initialized.
+ * \param d             The private signing key. This must be initialized
+ *                      and setup, for example through
+ *                      mbedtls_ecp_gen_privkey().
+ * \param buf           The hashed content to be signed. This must be a readable
+ *                      buffer of length \p blen Bytes. It may be \c NULL if
+ *                      \p blen is zero.
+ * \param blen          The length of \p buf in Bytes.
+ * \param f_rng         The RNG function. This must not be \c NULL.
+ * \param p_rng         The RNG context to be passed to \p f_rng. This may be
+ *                      \c NULL if \p f_rng doesn't need a context parameter.
+ * \param f_rng_blind   The RNG function used for blinding. This must not be
+ *                      \c NULL.
+ * \param p_rng_blind   The RNG context to be passed to \p f_rng. This may be
+ *                      \c NULL if \p f_rng doesn't need a context parameter.
+ * \param rs_ctx        The restart context to use. This may be \c NULL
+ *                      to disable restarting. If it is not \c NULL, it
+ *                      must point to an initialized restart context.
+ *
+ * \return              \c 0 on success.
+ * \return              #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
+ *                      operations was reached: see \c
+ *                      mbedtls_ecp_set_max_ops().
+ * \return              Another \c MBEDTLS_ERR_ECP_XXX, \c
+ *                      MBEDTLS_ERR_MPI_XXX or \c MBEDTLS_ERR_ASN1_XXX
+ *                      error code on failure.
+ */
+int mbedtls_ecdsa_sign_restartable(
+    mbedtls_ecp_group *grp,
+    mbedtls_mpi *r, mbedtls_mpi *s,
+    const mbedtls_mpi *d,
+    const unsigned char *buf, size_t blen,
+    int (*f_rng)(void *, unsigned char *, size_t),
+    void *p_rng,
+    int (*f_rng_blind)(void *, unsigned char *, size_t),
+    void *p_rng_blind,
+    mbedtls_ecdsa_restart_ctx *rs_ctx);
+
+#endif /* !MBEDTLS_ECDSA_SIGN_ALT */
+
+#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
+
+/**
+ * \brief               This function computes the ECDSA signature of a
+ *                      previously-hashed message, in a restartable way.
+ *
+ * \note                This function is like \c
+ *                      mbedtls_ecdsa_sign_det_ext() but it can return
+ *                      early and restart according to the limit set with
+ *                      \c mbedtls_ecp_set_max_ops() to reduce blocking.
+ *
+ * \note                If the bitlength of the message hash is larger
+ *                      than the bitlength of the group order, then the
+ *                      hash is truncated as defined in <em>Standards for
+ *                      Efficient Cryptography Group (SECG): SEC1 Elliptic
+ *                      Curve Cryptography</em>, section 4.1.3, step 5.
+ *
+ * \see                 ecp.h
+ *
+ * \param grp           The context for the elliptic curve to use.
+ *                      This must be initialized and have group parameters
+ *                      set, for example through mbedtls_ecp_group_load().
+ * \param r             The MPI context in which to store the first part
+ *                      the signature. This must be initialized.
+ * \param s             The MPI context in which to store the second part
+ *                      the signature. This must be initialized.
+ * \param d             The private signing key. This must be initialized
+ *                      and setup, for example through
+ *                      mbedtls_ecp_gen_privkey().
+ * \param buf           The hashed content to be signed. This must be a readable
+ *                      buffer of length \p blen Bytes. It may be \c NULL if
+ *                      \p blen is zero.
+ * \param blen          The length of \p buf in Bytes.
+ * \param md_alg        The hash algorithm used to hash the original data.
+ * \param f_rng_blind   The RNG function used for blinding. This must not be
+ *                      \c NULL.
+ * \param p_rng_blind   The RNG context to be passed to \p f_rng_blind. This may be
+ *                      \c NULL if \p f_rng_blind doesn't need a context parameter.
+ * \param rs_ctx        The restart context to use. This may be \c NULL
+ *                      to disable restarting. If it is not \c NULL, it
+ *                      must point to an initialized restart context.
+ *
+ * \return              \c 0 on success.
+ * \return              #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
+ *                      operations was reached: see \c
+ *                      mbedtls_ecp_set_max_ops().
+ * \return              Another \c MBEDTLS_ERR_ECP_XXX, \c
+ *                      MBEDTLS_ERR_MPI_XXX or \c MBEDTLS_ERR_ASN1_XXX
+ *                      error code on failure.
+ */
+int mbedtls_ecdsa_sign_det_restartable(
+    mbedtls_ecp_group *grp,
+    mbedtls_mpi *r, mbedtls_mpi *s,
+    const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
+    mbedtls_md_type_t md_alg,
+    int (*f_rng_blind)(void *, unsigned char *, size_t),
+    void *p_rng_blind,
+    mbedtls_ecdsa_restart_ctx *rs_ctx);
+
+#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
+
+/**
+ * \brief           This function verifies the ECDSA signature of a
+ *                  previously-hashed message.
+ *
+ * \note            If the bitlength of the message hash is larger than the
+ *                  bitlength of the group order, then the hash is truncated as
+ *                  defined in <em>Standards for Efficient Cryptography Group
+ *                  (SECG): SEC1 Elliptic Curve Cryptography</em>, section
+ *                  4.1.4, step 3.
+ *
+ * \see             ecp.h
+ *
+ * \param grp       The ECP group to use.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param buf       The hashed content that was signed. This must be a readable
+ *                  buffer of length \p blen Bytes. It may be \c NULL if
+ *                  \p blen is zero.
+ * \param blen      The length of \p buf in Bytes.
+ * \param Q         The public key to use for verification. This must be
+ *                  initialized and setup.
+ * \param r         The first integer of the signature.
+ *                  This must be initialized.
+ * \param s         The second integer of the signature.
+ *                  This must be initialized.
+ *
+ * \return          \c 0 on success.
+ * \return          An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
+ *                  error code on failure.
+ */
+int mbedtls_ecdsa_verify(mbedtls_ecp_group *grp,
+                         const unsigned char *buf, size_t blen,
+                         const mbedtls_ecp_point *Q, const mbedtls_mpi *r,
+                         const mbedtls_mpi *s);
+
+#if !defined(MBEDTLS_ECDSA_VERIFY_ALT)
+/**
+ * \brief           This function verifies the ECDSA signature of a
+ *                  previously-hashed message, in a restartable manner
+ *
+ * \note            If the bitlength of the message hash is larger than the
+ *                  bitlength of the group order, then the hash is truncated as
+ *                  defined in <em>Standards for Efficient Cryptography Group
+ *                  (SECG): SEC1 Elliptic Curve Cryptography</em>, section
+ *                  4.1.4, step 3.
+ *
+ * \see             ecp.h
+ *
+ * \param grp       The ECP group to use.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param buf       The hashed content that was signed. This must be a readable
+ *                  buffer of length \p blen Bytes. It may be \c NULL if
+ *                  \p blen is zero.
+ * \param blen      The length of \p buf in Bytes.
+ * \param Q         The public key to use for verification. This must be
+ *                  initialized and setup.
+ * \param r         The first integer of the signature.
+ *                  This must be initialized.
+ * \param s         The second integer of the signature.
+ *                  This must be initialized.
+ * \param rs_ctx    The restart context to use. This may be \c NULL to disable
+ *                  restarting. If it is not \c NULL, it must point to an
+ *                  initialized restart context.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
+ *                  operations was reached: see \c mbedtls_ecp_set_max_ops().
+ * \return          An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
+ *                  error code on failure.
+ */
+int mbedtls_ecdsa_verify_restartable(mbedtls_ecp_group *grp,
+                                     const unsigned char *buf, size_t blen,
+                                     const mbedtls_ecp_point *Q,
+                                     const mbedtls_mpi *r,
+                                     const mbedtls_mpi *s,
+                                     mbedtls_ecdsa_restart_ctx *rs_ctx);
+
+#endif /* !MBEDTLS_ECDSA_VERIFY_ALT */
+
+/**
+ * \brief           This function computes the ECDSA signature and writes it
+ *                  to a buffer, serialized as defined in <em>RFC-4492:
+ *                  Elliptic Curve Cryptography (ECC) Cipher Suites for
+ *                  Transport Layer Security (TLS)</em>.
+ *
+ * \warning         It is not thread-safe to use the same context in
+ *                  multiple threads.
+ *
+ * \note            The deterministic version is used if
+ *                  #MBEDTLS_ECDSA_DETERMINISTIC is defined. For more
+ *                  information, see <em>RFC-6979: Deterministic Usage
+ *                  of the Digital Signature Algorithm (DSA) and Elliptic
+ *                  Curve Digital Signature Algorithm (ECDSA)</em>.
+ *
+ * \note            If the bitlength of the message hash is larger than the
+ *                  bitlength of the group order, then the hash is truncated as
+ *                  defined in <em>Standards for Efficient Cryptography Group
+ *                  (SECG): SEC1 Elliptic Curve Cryptography</em>, section
+ *                  4.1.3, step 5.
+ *
+ * \see             ecp.h
+ *
+ * \param ctx       The ECDSA context to use. This must be initialized
+ *                  and have a group and private key bound to it, for example
+ *                  via mbedtls_ecdsa_genkey() or mbedtls_ecdsa_from_keypair().
+ * \param md_alg    The message digest that was used to hash the message.
+ * \param hash      The message hash to be signed. This must be a readable
+ *                  buffer of length \p hlen Bytes.
+ * \param hlen      The length of the hash \p hash in Bytes.
+ * \param sig       The buffer to which to write the signature. This must be a
+ *                  writable buffer of length at least twice as large as the
+ *                  size of the curve used, plus 9. For example, 73 Bytes if
+ *                  a 256-bit curve is used. A buffer length of
+ *                  #MBEDTLS_ECDSA_MAX_LEN is always safe.
+ * \param sig_size  The size of the \p sig buffer in bytes.
+ * \param slen      The address at which to store the actual length of
+ *                  the signature written. Must not be \c NULL.
+ * \param f_rng     The RNG function. This must not be \c NULL if
+ *                  #MBEDTLS_ECDSA_DETERMINISTIC is unset. Otherwise,
+ *                  it is used only for blinding and may be set to \c NULL, but
+ *                  doing so is DEPRECATED.
+ * \param p_rng     The RNG context to be passed to \p f_rng. This may be
+ *                  \c NULL if \p f_rng is \c NULL or doesn't use a context.
+ *
+ * \return          \c 0 on success.
+ * \return          An \c MBEDTLS_ERR_ECP_XXX, \c MBEDTLS_ERR_MPI_XXX or
+ *                  \c MBEDTLS_ERR_ASN1_XXX error code on failure.
+ */
+int mbedtls_ecdsa_write_signature(mbedtls_ecdsa_context *ctx,
+                                  mbedtls_md_type_t md_alg,
+                                  const unsigned char *hash, size_t hlen,
+                                  unsigned char *sig, size_t sig_size, size_t *slen,
+                                  int (*f_rng)(void *, unsigned char *, size_t),
+                                  void *p_rng);
+
+/**
+ * \brief           This function computes the ECDSA signature and writes it
+ *                  to a buffer, in a restartable way.
+ *
+ * \see             \c mbedtls_ecdsa_write_signature()
+ *
+ * \note            This function is like \c mbedtls_ecdsa_write_signature()
+ *                  but it can return early and restart according to the limit
+ *                  set with \c mbedtls_ecp_set_max_ops() to reduce blocking.
+ *
+ * \param ctx       The ECDSA context to use. This must be initialized
+ *                  and have a group and private key bound to it, for example
+ *                  via mbedtls_ecdsa_genkey() or mbedtls_ecdsa_from_keypair().
+ * \param md_alg    The message digest that was used to hash the message.
+ * \param hash      The message hash to be signed. This must be a readable
+ *                  buffer of length \p hlen Bytes.
+ * \param hlen      The length of the hash \p hash in Bytes.
+ * \param sig       The buffer to which to write the signature. This must be a
+ *                  writable buffer of length at least twice as large as the
+ *                  size of the curve used, plus 9. For example, 73 Bytes if
+ *                  a 256-bit curve is used. A buffer length of
+ *                  #MBEDTLS_ECDSA_MAX_LEN is always safe.
+ * \param sig_size  The size of the \p sig buffer in bytes.
+ * \param slen      The address at which to store the actual length of
+ *                  the signature written. Must not be \c NULL.
+ * \param f_rng     The RNG function. This must not be \c NULL if
+ *                  #MBEDTLS_ECDSA_DETERMINISTIC is unset. Otherwise,
+ *                  it is unused and may be set to \c NULL.
+ * \param p_rng     The RNG context to be passed to \p f_rng. This may be
+ *                  \c NULL if \p f_rng is \c NULL or doesn't use a context.
+ * \param rs_ctx    The restart context to use. This may be \c NULL to disable
+ *                  restarting. If it is not \c NULL, it must point to an
+ *                  initialized restart context.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
+ *                  operations was reached: see \c mbedtls_ecp_set_max_ops().
+ * \return          Another \c MBEDTLS_ERR_ECP_XXX, \c MBEDTLS_ERR_MPI_XXX or
+ *                  \c MBEDTLS_ERR_ASN1_XXX error code on failure.
+ */
+int mbedtls_ecdsa_write_signature_restartable(mbedtls_ecdsa_context *ctx,
+                                              mbedtls_md_type_t md_alg,
+                                              const unsigned char *hash, size_t hlen,
+                                              unsigned char *sig, size_t sig_size, size_t *slen,
+                                              int (*f_rng)(void *, unsigned char *, size_t),
+                                              void *p_rng,
+                                              mbedtls_ecdsa_restart_ctx *rs_ctx);
+
+/**
+ * \brief           This function reads and verifies an ECDSA signature.
+ *
+ * \note            If the bitlength of the message hash is larger than the
+ *                  bitlength of the group order, then the hash is truncated as
+ *                  defined in <em>Standards for Efficient Cryptography Group
+ *                  (SECG): SEC1 Elliptic Curve Cryptography</em>, section
+ *                  4.1.4, step 3.
+ *
+ * \see             ecp.h
+ *
+ * \param ctx       The ECDSA context to use. This must be initialized
+ *                  and have a group and public key bound to it.
+ * \param hash      The message hash that was signed. This must be a readable
+ *                  buffer of length \p hlen Bytes.
+ * \param hlen      The size of the hash \p hash.
+ * \param sig       The signature to read and verify. This must be a readable
+ *                  buffer of length \p slen Bytes.
+ * \param slen      The size of \p sig in Bytes.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if signature is invalid.
+ * \return          #MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH if there is a valid
+ *                  signature in \p sig, but its length is less than \p siglen.
+ * \return          An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_ERR_MPI_XXX
+ *                  error code on failure for any other reason.
+ */
+int mbedtls_ecdsa_read_signature(mbedtls_ecdsa_context *ctx,
+                                 const unsigned char *hash, size_t hlen,
+                                 const unsigned char *sig, size_t slen);
+
+/**
+ * \brief           This function reads and verifies an ECDSA signature,
+ *                  in a restartable way.
+ *
+ * \see             \c mbedtls_ecdsa_read_signature()
+ *
+ * \note            This function is like \c mbedtls_ecdsa_read_signature()
+ *                  but it can return early and restart according to the limit
+ *                  set with \c mbedtls_ecp_set_max_ops() to reduce blocking.
+ *
+ * \param ctx       The ECDSA context to use. This must be initialized
+ *                  and have a group and public key bound to it.
+ * \param hash      The message hash that was signed. This must be a readable
+ *                  buffer of length \p hlen Bytes.
+ * \param hlen      The size of the hash \p hash.
+ * \param sig       The signature to read and verify. This must be a readable
+ *                  buffer of length \p slen Bytes.
+ * \param slen      The size of \p sig in Bytes.
+ * \param rs_ctx    The restart context to use. This may be \c NULL to disable
+ *                  restarting. If it is not \c NULL, it must point to an
+ *                  initialized restart context.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if signature is invalid.
+ * \return          #MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH if there is a valid
+ *                  signature in \p sig, but its length is less than \p siglen.
+ * \return          #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
+ *                  operations was reached: see \c mbedtls_ecp_set_max_ops().
+ * \return          Another \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_ERR_MPI_XXX
+ *                  error code on failure for any other reason.
+ */
+int mbedtls_ecdsa_read_signature_restartable(mbedtls_ecdsa_context *ctx,
+                                             const unsigned char *hash, size_t hlen,
+                                             const unsigned char *sig, size_t slen,
+                                             mbedtls_ecdsa_restart_ctx *rs_ctx);
+
+/**
+ * \brief          This function generates an ECDSA keypair on the given curve.
+ *
+ * \see            ecp.h
+ *
+ * \param ctx      The ECDSA context to store the keypair in.
+ *                 This must be initialized.
+ * \param gid      The elliptic curve to use. One of the various
+ *                 \c MBEDTLS_ECP_DP_XXX macros depending on configuration.
+ * \param f_rng    The RNG function to use. This must not be \c NULL.
+ * \param p_rng    The RNG context to be passed to \p f_rng. This may be
+ *                 \c NULL if \p f_rng doesn't need a context argument.
+ *
+ * \return         \c 0 on success.
+ * \return         An \c MBEDTLS_ERR_ECP_XXX code on failure.
+ */
+int mbedtls_ecdsa_genkey(mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
+                         int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
+
+/**
+ * \brief           This function sets up an ECDSA context from an EC key pair.
+ *
+ * \see             ecp.h
+ *
+ * \param ctx       The ECDSA context to setup. This must be initialized.
+ * \param key       The EC key to use. This must be initialized and hold
+ *                  a private-public key pair or a public key. In the former
+ *                  case, the ECDSA context may be used for signature creation
+ *                  and verification after this call. In the latter case, it
+ *                  may be used for signature verification.
+ *
+ * \return          \c 0 on success.
+ * \return          An \c MBEDTLS_ERR_ECP_XXX code on failure.
+ */
+int mbedtls_ecdsa_from_keypair(mbedtls_ecdsa_context *ctx,
+                               const mbedtls_ecp_keypair *key);
+
+/**
+ * \brief           This function initializes an ECDSA context.
+ *
+ * \param ctx       The ECDSA context to initialize.
+ *                  This must not be \c NULL.
+ */
+void mbedtls_ecdsa_init(mbedtls_ecdsa_context *ctx);
+
+/**
+ * \brief           This function frees an ECDSA context.
+ *
+ * \param ctx       The ECDSA context to free. This may be \c NULL,
+ *                  in which case this function does nothing. If it
+ *                  is not \c NULL, it must be initialized.
+ */
+void mbedtls_ecdsa_free(mbedtls_ecdsa_context *ctx);
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+/**
+ * \brief           Initialize a restart context.
+ *
+ * \param ctx       The restart context to initialize.
+ *                  This must not be \c NULL.
+ */
+void mbedtls_ecdsa_restart_init(mbedtls_ecdsa_restart_ctx *ctx);
+
+/**
+ * \brief           Free the components of a restart context.
+ *
+ * \param ctx       The restart context to free. This may be \c NULL,
+ *                  in which case this function does nothing. If it
+ *                  is not \c NULL, it must be initialized.
+ */
+void mbedtls_ecdsa_restart_free(mbedtls_ecdsa_restart_ctx *ctx);
+#endif /* MBEDTLS_ECP_RESTARTABLE */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ecdsa.h */