How can I compute a SHA-2 (ideally SHA 256 or SHA 512) hash in iOS?

Question

The Security services API doesn\'t appear to allow me to compute a hash directly. There are plenty of public domain and liberally licensed versions available, but I\'d rathe

Answer 1

+ (NSData *)sha256DataFromData:(NSData *)data {
    unsigned char result[CC_SHA256_DIGEST_LENGTH];
    CC_SHA256([data bytes], (int)[data length], result);
    return [NSData dataWithBytes:result length:CC_SHA256_DIGEST_LENGTH];
}