         // Produce the final hash value (big-endian) as a 160 bit number:
         var result = [UInt8]()
         result.reserveCapacity(hh.count / 4)
-        variant.resultingArray(hh).forEach {
+        self.resultingArray(hh).forEach {
             let item = $0.bigEndian
             result += [UInt8(item & 0xff), UInt8((item >> 8) & 0xff), UInt8((item >> 16) & 0xff), UInt8((item >> 24) & 0xff)]
         }

        tmpMessage += Array<UInt8>(count: counter, repeatedValue: 0)
        return tmpMessage
    }
}

class SHA2 : HashProtocol {
    var size = 256
    let variant = SHA2.Variant.sha256
    
    let message: [UInt8]
    
    init(_ message:[UInt8]) {
        self.message = message
    }
    
    enum Variant {
        case sha256
        
        private var h:[UInt64] {
            return [0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19]
        }
        
        private var k:[UInt64] {
            return [
                0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
                        0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
                        0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
                        0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
                        0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
                        0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
                        0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
                        0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
            ]
        }
        
        private func resultingArray<T>(hh:[T]) -> ArraySlice<T> {
            return ArraySlice(hh)
        }
    }
    
    //FIXME: I can't do Generic func out of calculate32 and calculate64 (UInt32 vs UInt64), but if you can - please do pull request.
    func calculate32() -> [UInt8] {

        
        // hash values
        var hh = [UInt32]()
        self.h.forEach {(h) -> () in
            hh.append(UInt32(h))
        }
        
