| /** | |
| * \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 (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved | |
| * SPDX-License-Identifier: Apache-2.0 | |
| * | |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may | |
| * not use this file except in compliance with the License. | |
| * You may obtain a copy of the License at | |
| * | |
| * http://www.apache.org/licenses/LICENSE-2.0 | |
| * | |
| * Unless required by applicable law or agreed to in writing, software | |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| * See the License for the specific language governing permissions and | |
| * limitations under the License. | |
| * | |
| * This file is part of Mbed TLS (https://tls.mbed.org) | |
| */ | |
| #ifndef MBEDTLS_ECDSA_H | |
| #define MBEDTLS_ECDSA_H | |
| #if !defined(MBEDTLS_CONFIG_FILE) | |
| #include "config.h" | |
| #else | |
| #include MBEDTLS_CONFIG_FILE | |
| #endif | |
| #include "ecp.h" | |
| #include "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. | |
| */ | |
| 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 ecp; /*!< base context for ECP restart and | |
| shared administrative info */ | |
| mbedtls_ecdsa_restart_ver_ctx *ver; /*!< ecdsa_verify() sub-context */ | |
| mbedtls_ecdsa_restart_sig_ctx *sig; /*!< ecdsa_sign() sub-context */ | |
| #if defined(MBEDTLS_ECDSA_DETERMINISTIC) | |
| mbedtls_ecdsa_restart_det_ctx *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 computes the ECDSA signature of a | |
| * previously-hashed message. | |
| * | |
| * \note The deterministic version implemented in | |
| * mbedtls_ecdsa_sign_det() 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. | |
| * | |
| * \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( 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 ); | |
| #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 #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if the signature | |
| * is invalid. | |
| * \return An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX | |
| * error code on failure for any other reason. | |
| */ | |
| 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); | |
| /** | |
| * \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 blen 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 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. | |
| * | |
| * \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 *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 blen 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 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 *slen, | |
| int (*f_rng)(void *, unsigned char *, size_t), | |
| void *p_rng, | |
| mbedtls_ecdsa_restart_ctx *rs_ctx ); | |
| #if defined(MBEDTLS_ECDSA_DETERMINISTIC) | |
| #if ! defined(MBEDTLS_DEPRECATED_REMOVED) | |
| #if defined(MBEDTLS_DEPRECATED_WARNING) | |
| #define MBEDTLS_DEPRECATED __attribute__((deprecated)) | |
| #else | |
| #define MBEDTLS_DEPRECATED | |
| #endif | |
| /** | |
| * \brief This function computes an 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>. | |
| * | |
| * The deterministic version is defined in <em>RFC-6979: | |
| * Deterministic Usage of the Digital Signature Algorithm (DSA) | |
| * and Elliptic Curve Digital Signature Algorithm (ECDSA)</em>. | |
| * | |
| * \warning It is not thread-safe to use the same context in | |
| * multiple threads. | |
| * | |
| * \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 | |
| * | |
| * \deprecated Superseded by mbedtls_ecdsa_write_signature() in | |
| * Mbed TLS version 2.0 and later. | |
| * | |
| * \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 hash The message hash to be signed. This must be a readable | |
| * buffer of length \p blen 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 slen The address at which to store the actual length of | |
| * the signature written. Must not be \c NULL. | |
| * \param md_alg The message digest that was used to hash the message. | |
| * | |
| * \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_det( mbedtls_ecdsa_context *ctx, | |
| const unsigned char *hash, size_t hlen, | |
| unsigned char *sig, size_t *slen, | |
| mbedtls_md_type_t md_alg ) MBEDTLS_DEPRECATED; | |
| #undef MBEDTLS_DEPRECATED | |
| #endif /* MBEDTLS_DEPRECATED_REMOVED */ | |
| #endif /* MBEDTLS_ECDSA_DETERMINISTIC */ | |
| /** | |
| * \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 size 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 size 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 */ |