/** * \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) … /** The maximal size of an ECDSA signature in Bytes. */ #define MBEDTLS_ECDSA_MAX_LEN … #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) */ 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 */ 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 */
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