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Objective-C SHA2 hash not working correctly with non-ASCII
-(NSString*) sha512:(NSString*)input
{
    const char *cstr = [input cStringUsingEncoding:NSUTF8StringEncoding];
    NSData *data = [NSData dataWithBytes:cstr length:input.length];

    uint8_t digest[CC_SHA512_DIGEST_LENGTH];

    CC_SHA512(data.bytes, data.length, digest);

    NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA512_DIGEST_LENGTH * 2];

    for (int i = 0; i < CC_SHA512_DIGEST_LENGTH; i++) {
        [output appendFormat:@"%02x", digest[i]];
    }

    return output;
}

NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding];