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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, either version 3 of the License, or
(at your option) any later version.
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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