@@ -146,11 +146,11 @@
 + (instancetype)cryptoHash
 {
 	return [[[self alloc] init] autorelease];
 }
 
-- init
+- (instancetype)init
 {
 	self = [super init];
 
 	[self of_resetState];
 
@@ -162,11 +162,11 @@
 	[self reset];
 
 	[super dealloc];
 }
 
-- copy
+- (id)copy
 {
 	OFRIPEMD160Hash *copy = [[OFRIPEMD160Hash alloc] init];
 
 	memcpy(copy->_state, _state, sizeof(_state));
 	copy->_bits = _bits;