adding support for blind signatures (modernized version of Taler logic, with variable key length)

1 files changed, 82 insertions, 0 deletions

diff --git a/src/util/test_crypto_rsa.c b/src/util/test_crypto_rsa.c
new file mode 100644
index 000000000..a0a6b4722
--- /dev/null
+++ b/src/util/test_crypto_rsa.c
@@ -0,0 +1,82 @@
+/*
+  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/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);
+  /* 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);
+
+  /* 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;
+}