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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 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 <gcrypt.h>
#include "gnunet_util_lib.h"
#define KEY_SIZE 1024
gcry_error_t
rsa_full_domain_hash (gcry_mpi_t *r,
const struct GNUNET_HashCode *hash,
const struct GNUNET_CRYPTO_RsaPublicKey *pkey,
size_t *rsize);
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_rsa_BlindingKey *bkey;
struct GNUNET_CRYPTO_RsaSignature *sig;
struct GNUNET_CRYPTO_RsaSignature *sig_copy;
struct GNUNET_CRYPTO_RsaSignature *bsig;
struct GNUNET_HashCode hash;
char *blind_buf;
size_t bsize;
gcry_mpi_t v;
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);
/* test full domain hash size */
GNUNET_assert (0 == rsa_full_domain_hash (&v, &hash, pub, NULL));
GNUNET_assert (gcry_mpi_get_nbits(v) < KEY_SIZE);
gcry_mpi_clear_highbit (v, gcry_mpi_get_nbits(v)-1); /* clear the set high bit */
GNUNET_assert (gcry_mpi_get_nbits(v) > 3*KEY_SIZE/4);
/* This test necessarily randomly fails with probability 2^(3 - KEY_SIZE/4) */
gcry_mpi_release(v);
/* 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 */
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_blinded (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_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);
GNUNET_CRYPTO_rsa_blinding_key_free (bkey);
return 0;
}
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