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Diffstat (limited to 'include/mbedtls/ecdsa.h')
| -rw-r--r-- | include/mbedtls/ecdsa.h | 671 |
1 files changed, 0 insertions, 671 deletions
diff --git a/include/mbedtls/ecdsa.h b/include/mbedtls/ecdsa.h deleted file mode 100644 index 2ecf349..0000000 --- a/include/mbedtls/ecdsa.h +++ /dev/null @@ -1,671 +0,0 @@ -/** - * \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 */ |