static int pkey_ec_signctx(EVP_PKEY_CTX *ctx,
unsigned char *sig, size_t *siglen, EVP_MD_CTX *mctx)
{
int ret;
unsigned int len;
EC_PKEY_CTX *dctx = ctx->data;
EC_KEY *ec_key = ctx->pkey->pkey.ec;
unsigned char dgst[EVP_MAX_MD_SIZE];
unsigned int dgstlen;
int type = NID_undef;
if (!sig) {
*siglen = SM2_signature_size(ec_key);
return 1;
} else if (*siglen < (size_t)SM2_signature_size(ec_key)) {
ECerr(EC_F_PKEY_SM2_SIGNCTX, EC_R_BUFFER_TOO_SMALL);
return 0;
}
if (!EVP_DigestFinal_ex(mctx, dgst, &dgstlen)) {
ECerr(EC_F_PKEY_SM2_SIGNCTX, ERR_R_EVP_LIB);
return 0;
}
if (dctx->sign_type == NID_sm2sign)
ret = SM2_sign(type, dgst, dgstlen, sig, &len, ec_key);
else
ret = ECDSA_sign(type, dgst, dgstlen, sig, &len, ec_key);
*siglen = (size_t)len;
return ret;
}
static int pkey_sm2_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
const unsigned char *dgst, size_t dgstlen)
{
int ret;
EC_PKEY_CTX *ec_ctx = ctx->data;
EC_KEY *ec_key = ctx->pkey->pkey.ec;
int type;
unsigned int len;
if (!sig) {
*siglen = SM2_signature_size(ec_key);
return 1;
}
if (*siglen < (size_t)SM2_signature_size(ec_key)) {
ECerr(EC_F_PKEY_SM2_SIGN, EC_R_BUFFER_TOO_SMALL);
return 0;
}
type = ec_ctx->md ? EVP_MD_type(ec_ctx->md) : NID_sm3;
if ((ret = SM2_sign(type, dgst, dgstlen, sig, &len, ec_key)) <= 0) {
return ret;
}
*siglen = (size_t)len;
return 1;
}
