ecs_sign.c

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/* crypto/ecdsa/ecdsa_sign.c */
/* ====================================================================
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 *
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 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer. 
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 *    distribution.
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 *    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/)"
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 *    "This product includes software developed by the OpenSSL Project
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 *
 * This product includes cryptographic software written by Eric Young
 * ([email protected]).  This product includes software written by Tim
 * Hudson ([email protected]).
 *
 */

#include "ecs_locl.h"
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include <openssl/rand.h>

ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst, int dlen, EC_KEY *eckey)
{
    return ECDSA_do_sign_ex(dgst, dlen, NULL, NULL, eckey);
}

ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dlen,
    const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey)
{
    ECDSA_DATA *ecdsa = ecdsa_check(eckey);
    if (ecdsa == NULL)
        return NULL;
    return ecdsa->meth->ecdsa_do_sign(dgst, dlen, kinv, rp, eckey);
}

int ECDSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char 
        *sig, unsigned int *siglen, EC_KEY *eckey)
{
    return ECDSA_sign_ex(type, dgst, dlen, sig, siglen, NULL, NULL, eckey);
}

int ECDSA_sign_ex(int type, const unsigned char *dgst, int dlen, unsigned char 
    *sig, unsigned int *siglen, const BIGNUM *kinv, const BIGNUM *r, 
    EC_KEY *eckey)
{
    ECDSA_SIG *s;
    RAND_seed(dgst, dlen);
    s = ECDSA_do_sign_ex(dgst, dlen, kinv, r, eckey);
    if (s == NULL)
    {
        *siglen=0;
        return 0;
    }
    *siglen = i2d_ECDSA_SIG(s, &sig);
    ECDSA_SIG_free(s);
    return 1;
}

int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp, 
        BIGNUM **rp)
{
    ECDSA_DATA *ecdsa = ecdsa_check(eckey);
    if (ecdsa == NULL)
        return 0;
    return ecdsa->meth->ecdsa_sign_setup(eckey, ctx_in, kinvp, rp); 
}