Fixed umac nonce increment.

ChangeLog

 2013-04-16  Niels Möller  <nisse@lysator.liu.se>
 
+	* umac32.c (umac32_digest): Fix nonce increment, use INCREMENT
+	macro.
+	* umac64.c (umac64_digest): Likewise.
+	* umac96.c (umac96_digest): Likewise.
+	* umac128.c (umac128_digest): Likewise.
+
 	* macros.h (INCREMENT): Allow size == 1.
 
 2013-04-15  Niels Möller  <nisse@lysator.liu.se>

umac128.c

@@ -108,12 +108,7 @@ umac128_digest (struct umac128_ctx *ctx,
   aes_encrypt (&ctx->pdf_key, AES_BLOCK_SIZE,
 	       (uint8_t *) tag, ctx->nonce);
 
-  /* Increment nonce */
-  i = ctx->nonce_length - 1;
-  if (++ctx->nonce[i] == 0)
-    while (i > 0)
-      if (++ctx->nonce[--i] == 0)
-	break;
+  INCREMENT (ctx->nonce_length, ctx->nonce);
 
   _umac_l2_final (ctx->l2_key, ctx->l2_state, 4, ctx->count, ctx->l1_out);
   for (i = 0; i < 4; i++)

umac32.c

@@ -115,10 +115,8 @@ umac32_digest (struct umac32_ctx *ctx,
       ctx->nonce_low = 0;
       ctx->nonce[i] += 4;
 
-      if (ctx->nonce[i] == 0)
-	while (i > 0)
-	  if (++ctx->nonce[--i] == 0)
-	    break;
+      if (ctx->nonce[i] == 0 && i > 0)
+	INCREMENT (i, ctx->nonce);
     }
 
   _umac_l2_final (ctx->l2_key, ctx->l2_state, 1, ctx->count, ctx->l1_out);

umac64.c

@@ -118,10 +118,8 @@ umac64_digest (struct umac64_ctx *ctx,
       ctx->nonce_low = 0;
       ctx->nonce[i] += 2;
 
-      if (ctx->nonce[i] == 0)
-	while (i > 0)
-	  if (++ctx->nonce[--i] == 0)
-	    break;
+      if (ctx->nonce[i] == 0 && i > 0)
+	INCREMENT (i, ctx->nonce);
     }
 
   _umac_l2_final (ctx->l2_key, ctx->l2_state, 2, ctx->count, ctx->l1_out);

umac96.c

@@ -106,12 +106,7 @@ umac96_digest (struct umac96_ctx *ctx,
   aes_encrypt (&ctx->pdf_key, AES_BLOCK_SIZE,
 	       (uint8_t *) tag, ctx->nonce);
 
-  /* Increment nonce */
-  i = ctx->nonce_length - 1;
-  if (++ctx->nonce[i] == 0)
-    while (i > 0)
-      if (++ctx->nonce[--i] == 0)
-	break;
+  INCREMENT (ctx->nonce_length, ctx->nonce);
 
   _umac_l2_final (ctx->l2_key, ctx->l2_state, 3, ctx->count, ctx->l1_out);
   for (i = 0; i < 3; i++)