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237 lines
8 KiB
C
237 lines
8 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) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_ECDSA_H
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#define POLARSSL_ECDSA_H
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#include "ecp.h"
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#if defined(POLARSSL_ECDSA_DETERMINISTIC)
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#include "md.h"
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#endif
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/**
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* \brief ECDSA context structure
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*
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* \note Purposefully begins with the same members as struct ecp_keypair.
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*/
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typedef struct
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{
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ecp_group grp; /*!< elliptic curve used */
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mpi d; /*!< secret signature key */
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ecp_point Q; /*!< public signature key */
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mpi r; /*!< first integer from signature */
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mpi s; /*!< second integer from signature */
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}
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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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* \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 POLARSSL_ERR_ECP_XXX or POLARSSL_MPI_XXX error code
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*/
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int ecdsa_sign( ecp_group *grp, mpi *r, mpi *s,
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const 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(POLARSSL_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)
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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 POLARSSL_ERR_ECP_XXX or POLARSSL_MPI_XXX error code
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*/
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int ecdsa_sign_det( ecp_group *grp, mpi *r, mpi *s,
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const mpi *d, const unsigned char *buf, size_t blen,
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md_type_t md_alg );
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#endif /* POLARSSL_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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* POLARSSL_ERR_ECP_BAD_INPUT_DATA if signature is invalid
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* or a POLARSSL_ERR_ECP_XXX or POLARSSL_MPI_XXX error code
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*/
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int ecdsa_verify( ecp_group *grp,
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const unsigned char *buf, size_t blen,
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const ecp_point *Q, const mpi *r, const 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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* \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 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 7 (eg. 71 bytes if a 256-bit
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* curve is used).
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*
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* \return 0 if successful,
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* or a POLARSSL_ERR_ECP, POLARSSL_ERR_MPI or
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* POLARSSL_ERR_ASN1 error code
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*/
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int ecdsa_write_signature( 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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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng );
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#if defined(POLARSSL_ECDSA_DETERMINISTIC)
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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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* \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 7 (eg. 71 bytes if a 256-bit
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* curve is used).
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*
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* \return 0 if successful,
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* or a POLARSSL_ERR_ECP, POLARSSL_ERR_MPI or
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* POLARSSL_ERR_ASN1 error code
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*/
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int ecdsa_write_signature_det( 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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md_type_t md_alg );
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#endif /* POLARSSL_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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* POLARSSL_ERR_ECP_BAD_INPUT_DATA if signature is invalid,
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* POLARSSL_ERR_ECP_SIG_LEN_MISTMATCH if the signature is
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* valid but its actual length is less than siglen,
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* or a POLARSSL_ERR_ECP or POLARSSL_ERR_MPI error code
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*/
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int ecdsa_read_signature( 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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* POLARSSL_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 POLARSSL_ERR_ECP code.
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*/
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int ecdsa_genkey( ecdsa_context *ctx, 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 POLARSSL_ERR_ECP code.
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*/
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int ecdsa_from_keypair( ecdsa_context *ctx, const 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 ecdsa_init( 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 ecdsa_free( ecdsa_context *ctx );
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/**
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* \brief Checkup routine
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*
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* \return 0 if successful, or 1 if the test failed
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*/
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int ecdsa_self_test( int verbose );
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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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