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/*
(c) Copyright 2012 - 2019 Anton Sviridenko
https://picapica.im
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 3.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "PICA_signverify.h"
#include <openssl/evp.h>
int PICA_signverify(EVP_PKEY *pubkey, void **datapointers, size_t *datalengths, unsigned char *sig, size_t siglen)
{
EVP_MD_CTX *mdctx = NULL;
int ret = 0;
mdctx = EVP_MD_CTX_create();
if (!mdctx)
return 0;
ret = EVP_DigestVerifyInit(mdctx, NULL, EVP_sha224(), NULL, pubkey);
if (ret != 1)
goto signverify_exit;
while (*datapointers)
{
ret = EVP_DigestVerifyUpdate(mdctx, *datapointers, *datalengths);
if (ret != 1)
goto signverify_exit;
datapointers++;
datalengths++;
}
ret = EVP_DigestVerifyFinal(mdctx, sig, siglen);
if (ret != 1)
ret = 0;
signverify_exit:
EVP_MD_CTX_destroy(mdctx);
return ret;
}
int PICA_do_signature(EVP_PKEY *privkey, void **datapointers, size_t *datalengths, unsigned char **sig, size_t *siglen)
{
int ret = 0;
EVP_MD_CTX *mdctx = NULL;
mdctx = EVP_MD_CTX_create();
if (!mdctx)
return 0;
ret = EVP_DigestSignInit(mdctx, NULL, EVP_sha224(), NULL, privkey);
if (ret != 1)
goto sig_exit;
while(*datapointers)
{
ret = EVP_DigestSignUpdate(mdctx, *datapointers, *datalengths);
if (ret != 1)
{
goto sig_exit;
break;
}
datapointers++;
datalengths++;
}
ret = EVP_DigestSignFinal(mdctx, NULL, (size_t*) siglen);
if (ret != 1)
goto sig_exit;
*sig = (unsigned char*) malloc(*siglen);
if (!*sig)
{
ret = 0;
goto sig_exit;
}
ret = EVP_DigestSignFinal(mdctx, *sig, (size_t*) siglen);
if (ret == 1)
ret = 1;
else
free(*sig);
sig_exit:
EVP_MD_CTX_destroy(mdctx);
return ret;
}
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