ObjFW  Diff

	void *pool = objc_autoreleasePoolPush();
	id <OFCryptoHash> hash = [class
	    cryptoHashWithAllowsSwappableMemory: true];
	size_t digestSize = [class digestSize];
	const unsigned char *digest;
	char cString[digestSize * 2];

	[hash updateWithBuffer: self.UTF8String
	[hash updateWithBuffer: self.UTF8String length: self.UTF8StringLength];
			length: self.UTF8StringLength];
	digest = hash.digest;

	for (size_t i = 0; i < digestSize; i++) {
		uint8_t high, low;

		high = digest[i] >> 4;
		low  = digest[i] & 0x0F;