Esempio n. 1
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 public static BigInteger Transform(string name, bool encrypt, BigInteger key, BigInteger message)
 {
     using (var cipher = SymmetricAlgorithm.Create(name))
     {
         // Bug - https://github.com/sgbj/Dukpt.NET/issues/5 - Specified key is not a valid size for this algorithm.
         // I usually trim the zero-bytes off the front of the array in the GetBytes method, 
         // but this algorithm expects either 8 or 16 byte keys, so GetBytes will occasionally return 7.
         var k = key.GetBytes();
         cipher.Key = new byte[Math.Max(0, 8 - k.Length)].Concat(key.GetBytes()).ToArray();
         cipher.IV = new byte[8];
         cipher.Mode = CipherMode.CBC;
         cipher.Padding = PaddingMode.Zeros;
         using (var crypto = encrypt ? cipher.CreateEncryptor() : cipher.CreateDecryptor())
         {
             var data = message.GetBytes();
             return BigInt.FromBytes(crypto.TransformFinalBlock(data, 0, data.Length));
         }
     }
 }
Esempio n. 2
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 public static BigInteger Transform(string name, bool encrypt, BigInteger key, BigInteger message)
 {
     using (var cipher = SymmetricAlgorithm.Create(name))
     {
         var k = key.GetBytes();
         //Credit goes to ichoes (https://github.com/ichoes) for fixing this issue (https://github.com/sgbj/Dukpt.NET/issues/5)
         //gets the next multiple of 8
         cipher.Key = new byte[Math.Max(0, GetNearestWholeMultiple(k.Length, 8) - k.Length)].Concat(key.GetBytes()).ToArray();
         cipher.IV = new byte[8];
         cipher.Mode = CipherMode.CBC;
         cipher.Padding = PaddingMode.Zeros;
         using (var crypto = encrypt ? cipher.CreateEncryptor() : cipher.CreateDecryptor())
         {
             var data = message.GetBytes();
             //Added the GetNearestWholeMultiple here.
             data = new byte[Math.Max(0, GetNearestWholeMultiple(data.Length, 8) - data.Length)].Concat(message.GetBytes()).ToArray();
             return BigInt.FromBytes(crypto.TransformFinalBlock(data, 0, data.Length));
         }
     }
 }
Esempio n. 3
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 public void WriteBigInt(BigInteger b, int length)
 {
     byte[] bytes = b.GetBytes();
     int bytes_copy_amount = Math.Min(length, bytes.Length);
     Write(bytes, 0, bytes_copy_amount);
     for (int i = bytes.Length; i < length; ++i)
         Write((byte) 0); //pad
 }