HMAC SHA1 with Base64

gistfile1.m

// Uses this library for Base64 https://github.com/ekscrypto/Base64

+ (NSString *)hmacSHA1WithKey:(NSString *)key andSecret:(NSString *)secret {
    NSData *secretData = [secret dataUsingEncoding:NSUTF8StringEncoding];
    NSData *clearTextData = [key dataUsingEncoding:NSUTF8StringEncoding];
    unsigned char result[20];
	CCHmac(kCCHmacAlgSHA1, [secretData bytes], [secretData length], [clearTextData bytes], [clearTextData length], result);
    return [[NSData dataWithBytes:result length:20] base64String];
}