ECDSA Source Code.

ECDSA Source Code.

Related Link => https://www.openssl.org/source/license.html

#include <openssl/ec.h>

#include "ec_lcl.h"

#include <openssl/err.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)

{

    if (eckey->meth->sign_sig != NULL)

        return eckey->meth->sign_sig(dgst, dlen, kinv, rp, eckey);

    ECerr(EC_F_ECDSA_DO_SIGN_EX, EC_R_OPERATION_NOT_SUPPORTED);

    return NULL;

}

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)

{

    if (eckey->meth->sign != NULL)

        return eckey->meth->sign(type, dgst, dlen, sig, siglen, kinv, r, eckey);

    ECerr(EC_F_ECDSA_SIGN_EX, EC_R_OPERATION_NOT_SUPPORTED);

    return 0;

}

int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,

                     BIGNUM **rp)

{

    if (eckey->meth->sign_setup != NULL)

        return eckey->meth->sign_setup(eckey, ctx_in, kinvp, rp);

    ECerr(EC_F_ECDSA_SIGN_SETUP, EC_R_OPERATION_NOT_SUPPORTED);

    return 0;

}