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/*
This file is part of GNUnet
(C) 2014 Christian Grothoff (and other contributing authors)
GNUnet 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, 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file util/test_crypto_rsa.c
* @brief testcase for utility functions for RSA cryptography
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
*/
#include "platform.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_rsa_PrivateKey *priv;
struct GNUNET_CRYPTO_rsa_PublicKey *pub;
struct GNUNET_CRYPTO_rsa_BlindingKey *bkey;
struct GNUNET_CRYPTO_rsa_Signature *sig;
struct GNUNET_CRYPTO_rsa_Signature *bsig;
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);
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);
GNUNET_free (enc);
/* try ordinary sig first */
sig = GNUNET_CRYPTO_rsa_sign (priv,
&hash,
sizeof (hash));
GNUNET_assert (GNUNET_OK ==
GNUNET_CRYPTO_rsa_verify (&hash, sig, pub));
GNUNET_CRYPTO_rsa_signature_free (sig);
/* 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");
/* test blind signing */
bkey = GNUNET_CRYPTO_rsa_blinding_key_create (KEY_SIZE);
bsize = GNUNET_CRYPTO_rsa_blind (&hash,
bkey,
pub,
&blind_buf);
GNUNET_assert (0 != bsize);
bsig = GNUNET_CRYPTO_rsa_sign (priv,
blind_buf,
bsize);
GNUNET_free (blind_buf);
sig = GNUNET_CRYPTO_rsa_unblind (bsig,
bkey,
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_private_key_free (priv);
GNUNET_CRYPTO_rsa_public_key_free (pub);
GNUNET_CRYPTO_rsa_blinding_key_free (bkey);
return 0;
}
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