merge of 332f709a4cb39cde4cedab7c3be89e05f3023067

     and ca4ca78b82c5d430c69ce01bf794e8886ce81431

--HG--
extra : convert_revision : 74020525425a1de06739c6c3bed9ef35e4ad867e

1 files changed, 70 insertions, 0 deletions

diff --git a/libtomcrypt/src/misc/mpi/rand_prime.c b/libtomcrypt/src/misc/mpi/rand_prime.c
new file mode 100644
index 0000000..9c5921a
--- /dev/null
+++ b/libtomcrypt/src/misc/mpi/rand_prime.c
@@ -0,0 +1,70 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+  @file rand_prime.c
+  Generate a random prime, Tom St Denis
+*/  
+#ifdef MPI
+
+struct rng_data {
+   prng_state *prng;
+   int         wprng;
+};
+
+static int rand_prime_helper(unsigned char *dst, int len, void *dat)
+{
+   return (int)prng_descriptor[((struct rng_data *)dat)->wprng].read(dst, len, ((struct rng_data *)dat)->prng);
+}
+
+int rand_prime(mp_int *N, long len, prng_state *prng, int wprng)
+{
+   struct rng_data rng;
+   int             type, err;
+
+   LTC_ARGCHK(N != NULL);
+
+   /* allow sizes between 2 and 256 bytes for a prime size */
+   if (len < 16 || len > 4096) { 
+      return CRYPT_INVALID_PRIME_SIZE;
+   }
+   
+   /* valid PRNG? Better be! */
+   if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
+      return err; 
+   }
+
+   /* setup our callback data, then world domination! */
+   rng.prng  = prng;
+   rng.wprng = wprng;
+
+   /* get type */
+   if (len < 0) {
+      type = LTM_PRIME_BBS;
+      len = -len;
+   } else {
+      type = 0;
+   }
+  type |= LTM_PRIME_2MSB_ON;
+
+   /* New prime generation makes the code even more cryptoish-insane.  Do you know what this means!!!
+      -- Gir:  Yeah, oh wait, er, no.
+    */
+   return mpi_to_ltc_error(mp_prime_random_ex(N, mp_prime_rabin_miller_trials(len), len, type, rand_prime_helper, &rng));
+}
+      
+#endif
+
+
+/* $Source: /cvs/libtom/libtomcrypt/src/misc/mpi/rand_prime.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2005/05/05 14:35:59 $ */