fix typo in 32-bit code

src/decaf.c

@@ -82,7 +82,9 @@ static INLINE decaf_bool_t mask_to_bool (mask_t m) {
 static INLINE mask_t bool_to_mask (decaf_bool_t m) {
     /* On most arches this will be optimized to a simple cast. */
     mask_t ret = 0;
-    for (unsigned int i=0; i<1 || i<sizeof(decaf_bool_t)/sizeof(mask_t); i++) {
+    unsigned int limit = sizeof(decaf_bool_t)/sizeof(mask_t);
+    if (limit < 1) limit = 1;
+    for (unsigned int i=0; i<limit; i++) {
         ret |= ~ word_is_zero(m >> (i*8*sizeof(word_t)));
     }
     return ret;

src/public_include/decaf/common.h

@@ -59,7 +59,7 @@ typedef uint32_t decaf_word_t;      /**< Word size for internal computations */
 typedef int32_t decaf_sword_t;      /**< Signed word size for internal computations */
 typedef uint32_t decaf_bool_t;      /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
 typedef uint64_t decaf_dword_t;     /**< Double-word size for internal computations */
-typedef uint64_t decaf_dsword_t;     /**< Signed double-word size for internal computations */
+typedef int64_t decaf_dsword_t;     /**< Signed double-word size for internal computations */
 #endif
     
 /** DECAF_TRUE = -1 so that DECAF_TRUE & x = x */

test/test_decaf.cxx

@@ -331,19 +331,24 @@ static void test_crypto() {
     SpongeRng rng(Block("test_decaf_crypto"),SpongeRng::DETERMINISTIC);
 
     for (int i=0; i<NTESTS && test.passing_now; i++) {
-        PrivateKey<Group> priv1(rng), priv2(rng);
-        PublicKey<Group> pub1(priv1), pub2(priv2);
-        
-        SecureBuffer message = rng.read(i);
-        SecureBuffer sig(priv1.sign(message));
+        try {
+            PrivateKey<Group> priv1(rng), priv2(rng);
+            PublicKey<Group> pub1(priv1), pub2(priv2);
+    
+            SecureBuffer message = rng.read(i);
+            SecureBuffer sig(priv1.sign(message));
 
-        pub1.verify(message, sig);
-        
-        SecureBuffer s1(priv1.sharedSecret(pub2,32,true));
-        SecureBuffer s2(priv2.sharedSecret(pub1,32,false));
-        if (!memeq(s1,s2)) {
+            pub1.verify(message, sig);
+    
+            SecureBuffer s1(priv1.sharedSecret(pub2,32,true));
+            SecureBuffer s2(priv2.sharedSecret(pub1,32,false));
+            if (!memeq(s1,s2)) {
+                test.fail();
+                printf("    Shared secrets disagree on iteration %d.\n",i);
+            }
+        } catch (CryptoException) {
             test.fail();
-            printf("    Shared secrets disagree on iteration %d.\n",i);
+            printf("    Threw CryptoException.\n");
         }
     }
 }