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/*
This file is part of GNUnet
Copyright (C) 2014,2015 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file util/test_crypto_rsa.c
* @brief testcase for utility functions for RSA cryptography
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
* @author Jeffrey Burdges <burdges@gnunet.org>
*/
#include "platform.h"
#include <gcrypt.h>
#include "gnunet_util_lib.h"
#define KEY_SIZE 1024
int
main(int argc,
char *argv[])
{
#define RND_BLK_SIZE 4096
unsigned char rnd_blk[RND_BLK_SIZE];
struct GNUNET_CRYPTO_RsaPrivateKey *priv;
struct GNUNET_CRYPTO_RsaPrivateKey *priv_copy;
struct GNUNET_CRYPTO_RsaPublicKey *pub;
struct GNUNET_CRYPTO_RsaPublicKey *pub_copy;
struct GNUNET_CRYPTO_RsaSignature *sig;
struct GNUNET_CRYPTO_RsaSignature *sig_copy;
struct GNUNET_CRYPTO_RsaSignature *bsig;
struct GNUNET_CRYPTO_RsaBlindingKeySecret bsec;
struct GNUNET_HashCode hash;
char *blind_buf;
size_t bsize;
GNUNET_log_setup("test-rsa", "WARNING", NULL);
GNUNET_CRYPTO_random_block(GNUNET_CRYPTO_QUALITY_WEAK,
rnd_blk,
RND_BLK_SIZE);
GNUNET_CRYPTO_hash(rnd_blk,
RND_BLK_SIZE,
&hash);
priv = GNUNET_CRYPTO_rsa_private_key_create(KEY_SIZE);
priv_copy = GNUNET_CRYPTO_rsa_private_key_dup(priv);
GNUNET_assert(NULL != priv_copy);
GNUNET_assert(0 == GNUNET_CRYPTO_rsa_private_key_cmp(priv, priv_copy));
pub = GNUNET_CRYPTO_rsa_private_key_get_public(priv);
/* Encoding */
size_t size;
char *enc;
enc = NULL;
size = GNUNET_CRYPTO_rsa_private_key_encode(priv, &enc);
/* Decoding */
GNUNET_CRYPTO_rsa_private_key_free(priv);
priv = NULL;
priv = GNUNET_CRYPTO_rsa_private_key_decode(enc, size);
GNUNET_assert(NULL != priv);
GNUNET_CRYPTO_random_block(GNUNET_CRYPTO_QUALITY_WEAK,
enc, size);
GNUNET_assert(NULL == GNUNET_CRYPTO_rsa_private_key_decode(enc, size));
(void)fprintf(stderr, "The above warning is expected.\n");
GNUNET_free(enc);
/* try ordinary sig first */
sig = GNUNET_CRYPTO_rsa_sign_fdh(priv,
&hash);
sig_copy = GNUNET_CRYPTO_rsa_signature_dup(sig);
GNUNET_assert(NULL != sig);
GNUNET_assert(0 == GNUNET_CRYPTO_rsa_signature_cmp(sig, sig_copy));
pub_copy = GNUNET_CRYPTO_rsa_public_key_dup(pub);
GNUNET_assert(NULL != pub_copy);
GNUNET_assert(GNUNET_OK ==
GNUNET_CRYPTO_rsa_verify(&hash, sig, pub_copy));
/* corrupt our hash and see if the signature is still valid */
GNUNET_CRYPTO_random_block(GNUNET_CRYPTO_QUALITY_WEAK, &hash,
sizeof(struct GNUNET_HashCode));
GNUNET_assert(GNUNET_OK != GNUNET_CRYPTO_rsa_verify(&hash,
sig,
pub));
(void)fprintf(stderr, "The above warning is expected.\n");
GNUNET_CRYPTO_rsa_signature_free(sig);
/* test blind signing */
GNUNET_CRYPTO_random_block(GNUNET_CRYPTO_QUALITY_WEAK,
&bsec,
sizeof(bsec));
GNUNET_CRYPTO_rsa_blind(&hash,
&bsec,
pub,
&blind_buf, &bsize);
GNUNET_assert(0 != bsize);
bsig = GNUNET_CRYPTO_rsa_sign_blinded(priv,
blind_buf,
bsize);
GNUNET_free(blind_buf);
sig = GNUNET_CRYPTO_rsa_unblind(bsig,
&bsec,
pub);
GNUNET_CRYPTO_rsa_signature_free(bsig);
GNUNET_assert(GNUNET_OK ==
GNUNET_CRYPTO_rsa_verify(&hash, sig, pub));
GNUNET_CRYPTO_rsa_signature_free(sig);
GNUNET_CRYPTO_rsa_signature_free(sig_copy);
GNUNET_CRYPTO_rsa_private_key_free(priv);
GNUNET_CRYPTO_rsa_private_key_free(priv_copy);
GNUNET_CRYPTO_rsa_public_key_free(pub);
GNUNET_CRYPTO_rsa_public_key_free(pub_copy);
return 0;
}
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