--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtomcrypt/src/pk/dsa/dsa_verify_hash.c	Sat Feb 03 08:20:34 2007 +0000
@@ -0,0 +1,126 @@
+/* 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, [email protected], http://libtomcrypt.com
+ */
+#include "tomcrypt.h"
+
+/**
+   @file dsa_verify_hash.c
+   DSA implementation, verify a signature, Tom St Denis
+*/
+
+
+#ifdef MDSA
+
+/**
+  Verify a DSA signature
+  @param r        DSA "r" parameter
+  @param s        DSA "s" parameter
+  @param hash     The hash that was signed
+  @param hashlen  The length of the hash that was signed
+  @param stat     [out] The result of the signature verification, 1==valid, 0==invalid
+  @param key      The corresponding public DH key
+  @return CRYPT_OK if successful (even if the signature is invalid)
+*/
+int dsa_verify_hash_raw(         void   *r,          void   *s,
+                    const unsigned char *hash, unsigned long hashlen, 
+                                    int *stat,      dsa_key *key)
+{
+   void          *w, *v, *u1, *u2;
+   int           err;
+
+   LTC_ARGCHK(r    != NULL);
+   LTC_ARGCHK(s    != NULL);
+   LTC_ARGCHK(stat != NULL);
+   LTC_ARGCHK(key  != NULL);
+
+   /* default to invalid signature */
+   *stat = 0;
+
+   /* init our variables */
+   if ((err = mp_init_multi(&w, &v, &u1, &u2, NULL)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* neither r or s can be null or >q*/
+   if (mp_iszero(r) == LTC_MP_YES || mp_iszero(s) == LTC_MP_YES || mp_cmp(r, key->q) != LTC_MP_LT || mp_cmp(s, key->q) != LTC_MP_LT) {
+      err = CRYPT_INVALID_PACKET;
+      goto error;
+   }
+   
+   /* w = 1/s mod q */
+   if ((err = mp_invmod(s, key->q, w)) != CRYPT_OK)                                       { goto error; }
+
+   /* u1 = m * w mod q */
+   if ((err = mp_read_unsigned_bin(u1, (unsigned char *)hash, hashlen)) != CRYPT_OK)      { goto error; }
+   if ((err = mp_mulmod(u1, w, key->q, u1)) != CRYPT_OK)                                  { goto error; }
+
+   /* u2 = r*w mod q */
+   if ((err = mp_mulmod(r, w, key->q, u2)) != CRYPT_OK)                                   { goto error; } 
+
+   /* v = g^u1 * y^u2 mod p mod q */
+   if ((err = mp_exptmod(key->g, u1, key->p, u1)) != CRYPT_OK)                            { goto error; }
+   if ((err = mp_exptmod(key->y, u2, key->p, u2)) != CRYPT_OK)                            { goto error; }
+   if ((err = mp_mulmod(u1, u2, key->p, v)) != CRYPT_OK)                                  { goto error; }
+   if ((err = mp_mod(v, key->q, v)) != CRYPT_OK)                                          { goto error; }
+
+   /* if r = v then we're set */
+   if (mp_cmp(r, v) == LTC_MP_EQ) {
+      *stat = 1;
+   }
+
+   err = CRYPT_OK;
+error:
+   mp_clear_multi(w, v, u1, u2, NULL);
+   return err;
+}
+
+/**
+  Verify a DSA signature
+  @param sig      The signature
+  @param siglen   The length of the signature (octets)
+  @param hash     The hash that was signed
+  @param hashlen  The length of the hash that was signed
+  @param stat     [out] The result of the signature verification, 1==valid, 0==invalid
+  @param key      The corresponding public DH key
+  @return CRYPT_OK if successful (even if the signature is invalid)
+*/
+int dsa_verify_hash(const unsigned char *sig, unsigned long siglen,
+                    const unsigned char *hash, unsigned long hashlen, 
+                    int *stat, dsa_key *key)
+{
+   int    err;
+   void   *r, *s;
+
+   if ((err = mp_init_multi(&r, &s, NULL)) != CRYPT_OK) {
+      return CRYPT_MEM;
+   }
+
+   /* decode the sequence */
+   if ((err = der_decode_sequence_multi(sig, siglen,
+                                  LTC_ASN1_INTEGER, 1UL, r, 
+                                  LTC_ASN1_INTEGER, 1UL, s, 
+                                  LTC_ASN1_EOL,     0UL, NULL)) != CRYPT_OK) {
+      goto LBL_ERR;
+   }
+
+   /* do the op */
+   err = dsa_verify_hash_raw(r, s, hash, hashlen, stat, key);
+
+LBL_ERR:
+   mp_clear_multi(r, s, NULL);
+   return err;
+}
+
+#endif
+
+
+/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_verify_hash.c,v $ */
+/* $Revision: 1.13 $ */
+/* $Date: 2006/12/04 03:18:43 $ */