@@ -168,11 +168,11 @@
 		    exceptionWithHash: self];
 
 	sha1_update(_state, &_count, _buffer, buffer, length);
 }
 
-- (uint8_t*)digest
+- (const uint8_t*)digest
 {
 	size_t i;
 	char finalcount[8];
 
 	if (_calculated)
@@ -186,11 +186,11 @@
 	while ((_count & 504) != 448)
 		sha1_update(_state, &_count, _buffer, "\0", 1);
 	/* Should cause a sha1_transform() */
 	sha1_update(_state, &_count, _buffer, finalcount, 8);
 
-	for (i = 0; i < OF_SHA1_DIGEST_SIZE; i++)
+	for (i = 0; i < 20; i++)
 		_digest[i] = (char)((_state[i >> 2] >>
 		    ((3 - (i & 3)) * 8)) & 255);
 
 	_calculated = true;