@@ -96,10 +96,11 @@
 	state[4] += new[4];
 }
 
 @implementation OFSHA1Hash
 @synthesize calculated = _calculated;
+@synthesize allowsSwappableMemory = _allowsSwappableMemory;
 
 + (size_t)digestSize
 {
 	return DIGEST_SIZE;
 }
@@ -107,32 +108,40 @@
 + (size_t)blockSize
 {
 	return BLOCK_SIZE;
 }
 
-+ (instancetype)cryptoHash
++ (instancetype)cryptoHashWithAllowsSwappableMemory: (bool)allowsSwappableMemory
 {
-	return [[[self alloc] init] autorelease];
+	return [[[self alloc] initWithAllowsSwappableMemory:
+	    allowsSwappableMemory] autorelease];
 }
 
-- (instancetype)init
+- (instancetype)initWithAllowsSwappableMemory: (bool)allowsSwappableMemory
 {
 	self = [super init];
 
 	@try {
 		_iVarsData = [[OFSecureData alloc]
-		    initWithCount: sizeof(*_iVars)];
+			    initWithCount: sizeof(*_iVars)
+		    allowsSwappableMemory: allowsSwappableMemory];
 		_iVars = _iVarsData.mutableItems;
+		_allowsSwappableMemory = allowsSwappableMemory;
 
 		[self of_resetState];
 	} @catch (id e) {
 		[self release];
 		@throw e;
 	}
 
 	return self;
 }
+
+- (instancetype)init
+{
+	OF_INVALID_INIT_METHOD
+}
 
 - (instancetype)of_init
 {
 	return [super init];
 }
@@ -158,10 +167,11 @@
 {
 	OFSHA1Hash *copy = [[OFSHA1Hash alloc] of_init];
 
 	copy->_iVarsData = [_iVarsData copy];
 	copy->_iVars = copy->_iVarsData.mutableItems;
+	copy->_allowsSwappableMemory = _allowsSwappableMemory;
 	copy->_calculated = _calculated;
 
 	return copy;
 }