Generate hash from UIImage

Question

I\'m trying to compare two UIImages from the file system to see if they are the same. Obviously, I can\'t use NSObject\'s hash method, since this returns a hash of the objec

Answer 1

more elegant code below

+(NSString *)MD5HexDigest:(NSData *)input {
    unsigned char result[CC_MD5_DIGEST_LENGTH];

    CC_MD5(input.bytes, (unsigned int)input.length, result);
    NSMutableString *ret = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH*2];
    for (int i = 0; i