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/* $OpenBSD: ecdsa.h,v 1.4 2015/02/08 13:35:06 jsing Exp $ */
/**
* \file crypto/ecdsa/ecdsa.h Include file for the OpenSSL ECDSA functions
* \author Written by Nils Larsch for the OpenSSL project
*/
/* ====================================================================
* Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#ifndef HEADER_ECDSA_H
#define HEADER_ECDSA_H
#include <openssl/opensslconf.h>
#ifdef OPENSSL_NO_ECDSA
#error ECDSA is disabled.
#endif
#include <openssl/ec.h>
#include <openssl/ossl_typ.h>
#ifndef OPENSSL_NO_DEPRECATED
#include <openssl/bn.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
typedef struct ECDSA_SIG_st ECDSA_SIG;
struct ecdsa_method {
const char *name;
ECDSA_SIG *(*ecdsa_do_sign)(const unsigned char *dgst, int dgst_len,
const BIGNUM *inv, const BIGNUM *rp, EC_KEY *eckey);
int (*ecdsa_sign_setup)(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv,
BIGNUM **r);
int (*ecdsa_do_verify)(const unsigned char *dgst, int dgst_len,
const ECDSA_SIG *sig, EC_KEY *eckey);
#if 0
int (*init)(EC_KEY *eckey);
int (*finish)(EC_KEY *eckey);
#endif
int flags;
char *app_data;
};
/* If this flag is set the ECDSA method is FIPS compliant and can be used
* in FIPS mode. This is set in the validated module method. If an
* application sets this flag in its own methods it is its responsibility
* to ensure the result is compliant.
*/
#define ECDSA_FLAG_FIPS_METHOD 0x1
struct ECDSA_SIG_st {
BIGNUM *r;
BIGNUM *s;
};
/** Allocates and initialize a ECDSA_SIG structure
* \return pointer to a ECDSA_SIG structure or NULL if an error occurred
*/
ECDSA_SIG *ECDSA_SIG_new(void);
/** frees a ECDSA_SIG structure
* \param sig pointer to the ECDSA_SIG structure
*/
void ECDSA_SIG_free(ECDSA_SIG *sig);
/** DER encode content of ECDSA_SIG object (note: this function modifies *pp
* (*pp += length of the DER encoded signature)).
* \param sig pointer to the ECDSA_SIG object
* \param pp pointer to a unsigned char pointer for the output or NULL
* \return the length of the DER encoded ECDSA_SIG object or 0
*/
int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **pp);
/** Decodes a DER encoded ECDSA signature (note: this function changes *pp
* (*pp += len)).
* \param sig pointer to ECDSA_SIG pointer (may be NULL)
* \param pp memory buffer with the DER encoded signature
* \param len length of the buffer
* \return pointer to the decoded ECDSA_SIG structure (or NULL)
*/
ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **sig, const unsigned char **pp, long len);
/** Computes the ECDSA signature of the given hash value using
* the supplied private key and returns the created signature.
* \param dgst pointer to the hash value
* \param dgst_len length of the hash value
* \param eckey EC_KEY object containing a private EC key
* \return pointer to a ECDSA_SIG structure or NULL if an error occurred
*/
ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst, int dgst_len,
EC_KEY *eckey);
/** Computes ECDSA signature of a given hash value using the supplied
* private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
* \param dgst pointer to the hash value to sign
* \param dgstlen length of the hash value
* \param kinv BIGNUM with a pre-computed inverse k (optional)
* \param rp BIGNUM with a pre-computed rp value (optioanl),
* see ECDSA_sign_setup
* \param eckey EC_KEY object containing a private EC key
* \return pointer to a ECDSA_SIG structure or NULL if an error occurred
*/
ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dgstlen,
const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey);
/** Verifies that the supplied signature is a valid ECDSA
* signature of the supplied hash value using the supplied public key.
* \param dgst pointer to the hash value
* \param dgst_len length of the hash value
* \param sig ECDSA_SIG structure
* \param eckey EC_KEY object containing a public EC key
* \return 1 if the signature is valid, 0 if the signature is invalid
* and -1 on error
*/
int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
const ECDSA_SIG *sig, EC_KEY* eckey);
const ECDSA_METHOD *ECDSA_OpenSSL(void);
/** Sets the default ECDSA method
* \param meth new default ECDSA_METHOD
*/
void ECDSA_set_default_method(const ECDSA_METHOD *meth);
/** Returns the default ECDSA method
* \return pointer to ECDSA_METHOD structure containing the default method
*/
const ECDSA_METHOD *ECDSA_get_default_method(void);
/** Sets method to be used for the ECDSA operations
* \param eckey EC_KEY object
* \param meth new method
* \return 1 on success and 0 otherwise
*/
int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth);
/** Returns the maximum length of the DER encoded signature
* \param eckey EC_KEY object
* \return numbers of bytes required for the DER encoded signature
*/
int ECDSA_size(const EC_KEY *eckey);
/** Precompute parts of the signing operation
* \param eckey EC_KEY object containing a private EC key
* \param ctx BN_CTX object (optional)
* \param kinv BIGNUM pointer for the inverse of k
* \param rp BIGNUM pointer for x coordinate of k * generator
* \return 1 on success and 0 otherwise
*/
int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv,
BIGNUM **rp);
/** Computes ECDSA signature of a given hash value using the supplied
* private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
* \param type this parameter is ignored
* \param dgst pointer to the hash value to sign
* \param dgstlen length of the hash value
* \param sig memory for the DER encoded created signature
* \param siglen pointer to the length of the returned signature
* \param eckey EC_KEY object containing a private EC key
* \return 1 on success and 0 otherwise
*/
int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);
/** Computes ECDSA signature of a given hash value using the supplied
* private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
* \param type this parameter is ignored
* \param dgst pointer to the hash value to sign
* \param dgstlen length of the hash value
* \param sig buffer to hold the DER encoded signature
* \param siglen pointer to the length of the returned signature
* \param kinv BIGNUM with a pre-computed inverse k (optional)
* \param rp BIGNUM with a pre-computed rp value (optioanl),
* see ECDSA_sign_setup
* \param eckey EC_KEY object containing a private EC key
* \return 1 on success and 0 otherwise
*/
int ECDSA_sign_ex(int type, const unsigned char *dgst, int dgstlen,
unsigned char *sig, unsigned int *siglen, const BIGNUM *kinv,
const BIGNUM *rp, EC_KEY *eckey);
/** Verifies that the given signature is valid ECDSA signature
* of the supplied hash value using the specified public key.
* \param type this parameter is ignored
* \param dgst pointer to the hash value
* \param dgstlen length of the hash value
* \param sig pointer to the DER encoded signature
* \param siglen length of the DER encoded signature
* \param eckey EC_KEY object containing a public EC key
* \return 1 if the signature is valid, 0 if the signature is invalid
* and -1 on error
*/
int ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,
const unsigned char *sig, int siglen, EC_KEY *eckey);
/* the standard ex_data functions */
int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg);
void *ECDSA_get_ex_data(EC_KEY *d, int idx);
/* BEGIN ERROR CODES */
/* The following lines are auto generated by the script mkerr.pl. Any changes
* made after this point may be overwritten when the script is next run.
*/
void ERR_load_ECDSA_strings(void);
/* Error codes for the ECDSA functions. */
/* Function codes. */
#define ECDSA_F_ECDSA_CHECK 104
#define ECDSA_F_ECDSA_DATA_NEW_METHOD 100
#define ECDSA_F_ECDSA_DO_SIGN 101
#define ECDSA_F_ECDSA_DO_VERIFY 102
#define ECDSA_F_ECDSA_SIGN_SETUP 103
/* Reason codes. */
#define ECDSA_R_BAD_SIGNATURE 100
#define ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 101
#define ECDSA_R_ERR_EC_LIB 102
#define ECDSA_R_MISSING_PARAMETERS 103
#define ECDSA_R_NEED_NEW_SETUP_VALUES 106
#define ECDSA_R_NON_FIPS_METHOD 107
#define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 104
#define ECDSA_R_SIGNATURE_MALLOC_FAILED 105
#ifdef __cplusplus
}
#endif
#endif
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