static int pkey_gost_ec_cp_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
size_t *siglen, const unsigned char *tbs,
size_t tbs_len)
{
DSA_SIG *unpacked_sig = NULL;
EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(ctx);
int order = 0;
if (!siglen)
return 0;
if (!pkey)
return 0;
switch (EVP_PKEY_base_id(pkey)) {
case NID_id_GostR3410_2001:
case NID_id_GostR3410_2012_256:
order = 64;
break;
case NID_id_GostR3410_2012_512:
order = 128;
break;
default:
return 0;
}
if (!sig) {
*siglen = order;
return 1;
}
unpacked_sig = gost_ec_sign(tbs, tbs_len, EVP_PKEY_get0(pkey));
if (!unpacked_sig) {
return 0;
}
return pack_sign_cp(unpacked_sig, order / 2, sig, siglen);
}
static int pkey_gost01_cp_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
const unsigned char *tbs, size_t tbs_len)
{
DSA_SIG *unpacked_sig=NULL;
EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(ctx);
if (!siglen) return 0;
if (!sig)
{
*siglen= 64; /* better to check size of curve order*/
return 1;
}
unpacked_sig = gost2001_do_sign(tbs,tbs_len,EVP_PKEY_get0(pkey));
if (!unpacked_sig)
{
return 0;
}
return pack_sign_cp(unpacked_sig,32,sig,siglen);
}