249 lines
8.9 KiB
C
249 lines
8.9 KiB
C
/**
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* \file ecdsa.h
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*
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* \brief Elliptic curve DSA
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_ECDSA_H
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#define MBEDTLS_ECDSA_H
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#include "ecp.h"
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#include "md.h"
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/*
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* RFC 4492 page 20:
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*
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* Ecdsa-Sig-Value ::= SEQUENCE {
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* r INTEGER,
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* s INTEGER
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* }
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*
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* Size is at most
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* 1 (tag) + 1 (len) + 1 (initial 0) + ECP_MAX_BYTES for each of r and s,
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* twice that + 1 (tag) + 2 (len) for the sequence
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* (assuming ECP_MAX_BYTES is less than 126 for r and s,
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* and less than 124 (total len <= 255) for the sequence)
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*/
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#if MBEDTLS_ECP_MAX_BYTES > 124
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#error "MBEDTLS_ECP_MAX_BYTES bigger than expected, please fix MBEDTLS_ECDSA_MAX_LEN"
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#endif
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/** Maximum size of an ECDSA signature in bytes */
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#define MBEDTLS_ECDSA_MAX_LEN ( 3 + 2 * ( 3 + MBEDTLS_ECP_MAX_BYTES ) )
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/**
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* \brief ECDSA context structure
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*/
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typedef mbedtls_ecp_keypair mbedtls_ecdsa_context;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Compute ECDSA signature of a previously hashed message
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*
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* \note The deterministic version is usually prefered.
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*
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* \param grp ECP group
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* \param r First output integer
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* \param s Second output integer
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* \param d Private signing key
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* \param buf Message hash
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* \param blen Length of buf
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* \param f_rng RNG function
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* \param p_rng RNG parameter
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*
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* \return 0 if successful,
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* or a MBEDTLS_ERR_ECP_XXX or MBEDTLS_MPI_XXX error code
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*/
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int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
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const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
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/**
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* \brief Compute ECDSA signature of a previously hashed message,
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* deterministic version (RFC 6979).
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*
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* \param grp ECP group
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* \param r First output integer
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* \param s Second output integer
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* \param d Private signing key
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* \param buf Message hash
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* \param blen Length of buf
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* \param md_alg MD algorithm used to hash the message
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*
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* \return 0 if successful,
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* or a MBEDTLS_ERR_ECP_XXX or MBEDTLS_MPI_XXX error code
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*/
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int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
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const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
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mbedtls_md_type_t md_alg );
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#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
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/**
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* \brief Verify ECDSA signature of a previously hashed message
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*
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* \param grp ECP group
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* \param buf Message hash
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* \param blen Length of buf
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* \param Q Public key to use for verification
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* \param r First integer of the signature
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* \param s Second integer of the signature
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*
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* \return 0 if successful,
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* MBEDTLS_ERR_ECP_BAD_INPUT_DATA if signature is invalid
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* or a MBEDTLS_ERR_ECP_XXX or MBEDTLS_MPI_XXX error code
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*/
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int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
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const unsigned char *buf, size_t blen,
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const mbedtls_ecp_point *Q, const mbedtls_mpi *r, const mbedtls_mpi *s);
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/**
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* \brief Compute ECDSA signature and write it to buffer,
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* serialized as defined in RFC 4492 page 20.
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* (Not thread-safe to use same context in multiple threads)
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*
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* \note The deterministice version (RFC 6979) is used if
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* MBEDTLS_ECDSA_DETERMINISTIC is defined.
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*
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* \param ctx ECDSA context
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* \param md_alg Algorithm that was used to hash the message
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* \param hash Message hash
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* \param hlen Length of hash
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* \param sig Buffer that will hold the signature
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* \param slen Length of the signature written
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* \param f_rng RNG function
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* \param p_rng RNG parameter
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*
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* \note The "sig" buffer must be at least as large as twice the
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* size of the curve used, plus 9 (eg. 73 bytes if a 256-bit
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* curve is used). MBEDTLS_ECDSA_MAX_LEN is always safe.
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*
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* \return 0 if successful,
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* or a MBEDTLS_ERR_ECP_XXX, MBEDTLS_ERR_MPI_XXX or
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* MBEDTLS_ERR_ASN1_XXX error code
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*/
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int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hlen,
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unsigned char *sig, size_t *slen,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng );
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#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
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#if ! defined(MBEDTLS_DEPRECATED_REMOVED)
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#if defined(MBEDTLS_DEPRECATED_WARNING)
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#define MBEDTLS_DEPRECATED __attribute__((deprecated))
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#else
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#define MBEDTLS_DEPRECATED
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#endif
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/**
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* \brief Compute ECDSA signature and write it to buffer,
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* serialized as defined in RFC 4492 page 20.
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* Deterministic version, RFC 6979.
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* (Not thread-safe to use same context in multiple threads)
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*
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* \deprecated Superseded by mbedtls_ecdsa_write_signature() in 2.0.0
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*
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* \param ctx ECDSA context
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* \param hash Message hash
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* \param hlen Length of hash
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* \param sig Buffer that will hold the signature
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* \param slen Length of the signature written
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* \param md_alg MD algorithm used to hash the message
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*
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* \note The "sig" buffer must be at least as large as twice the
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* size of the curve used, plus 9 (eg. 73 bytes if a 256-bit
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* curve is used). MBEDTLS_ECDSA_MAX_LEN is always safe.
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*
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* \return 0 if successful,
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* or a MBEDTLS_ERR_ECP_XXX, MBEDTLS_ERR_MPI_XXX or
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* MBEDTLS_ERR_ASN1_XXX error code
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*/
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int mbedtls_ecdsa_write_signature_det( mbedtls_ecdsa_context *ctx,
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const unsigned char *hash, size_t hlen,
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unsigned char *sig, size_t *slen,
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mbedtls_md_type_t md_alg ) MBEDTLS_DEPRECATED;
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#undef MBEDTLS_DEPRECATED
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#endif /* MBEDTLS_DEPRECATED_REMOVED */
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#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
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/**
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* \brief Read and verify an ECDSA signature
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*
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* \param ctx ECDSA context
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* \param hash Message hash
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* \param hlen Size of hash
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* \param sig Signature to read and verify
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* \param slen Size of sig
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*
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* \return 0 if successful,
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* MBEDTLS_ERR_ECP_BAD_INPUT_DATA if signature is invalid,
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* MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH if the signature is
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* valid but its actual length is less than siglen,
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* or a MBEDTLS_ERR_ECP_XXX or MBEDTLS_ERR_MPI_XXX error code
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*/
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int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
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const unsigned char *hash, size_t hlen,
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const unsigned char *sig, size_t slen );
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/**
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* \brief Generate an ECDSA keypair on the given curve
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*
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* \param ctx ECDSA context in which the keypair should be stored
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* \param gid Group (elliptic curve) to use. One of the various
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* MBEDTLS_ECP_DP_XXX macros depending on configuration.
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* \param f_rng RNG function
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* \param p_rng RNG parameter
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*
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* \return 0 on success, or a MBEDTLS_ERR_ECP_XXX code.
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*/
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int mbedtls_ecdsa_genkey( mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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/**
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* \brief Set an ECDSA context from an EC key pair
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*
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* \param ctx ECDSA context to set
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* \param key EC key to use
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*
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* \return 0 on success, or a MBEDTLS_ERR_ECP_XXX code.
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*/
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int mbedtls_ecdsa_from_keypair( mbedtls_ecdsa_context *ctx, const mbedtls_ecp_keypair *key );
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/**
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* \brief Initialize context
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*
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* \param ctx Context to initialize
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*/
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void mbedtls_ecdsa_init( mbedtls_ecdsa_context *ctx );
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/**
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* \brief Free context
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*
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* \param ctx Context to free
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*/
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void mbedtls_ecdsa_free( mbedtls_ecdsa_context *ctx );
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#ifdef __cplusplus
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}
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#endif
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#endif /* ecdsa.h */
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