/// <summary>
/// Decrypt data using this key.
/// </summary>
/// <param name="data">16, 32 or 48 hex data to decrypt.</param>
/// <returns>Decrypted data.</returns>
public string Decrypt(string data)
{
ValidateEncryptDecryptData(data);
if (data.Length == 16)
{
return(TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data));
}
if (data.Length == 32)
{
return(TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data.Substring(0, 16)) +
TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data.Substring(16, 16)));
}
return(TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data.Substring(0, 16)) +
TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data.Substring(16, 16)) +
TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data.Substring(32, 16)));
}
/// <summary>
/// Decrypt data using CBC mode.
/// </summary>
/// <param name="data">16, 32 or 48 hex data to decrypt.</param>
/// <returns>Decrypted data.</returns>
public string DecryptCbc(string data)
{
ValidateEncryptDecryptData(data);
if (data.Length == 16)
{
return(TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data));
}
if (data.Length == 32)
{
var resulta1 = TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data.Substring(0, 16));
return(resulta1 + TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data.Substring(16, 16)).XorHex(data.Substring(0, 16)));
}
var resulta2 = TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data.Substring(0, 16));
var resultb = TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data.Substring(16, 16).XorHex(data.Substring(0, 16)));
return(resulta2 + resultb + TripleDes.TripleDesDecrypt(PartA, PartB, PartC, data.Substring(32, 16).XorHex(data.Substring(16, 16))));
}
public void TestTripleDes(byte[] key1, byte[] key2, byte[] key3, byte[] data, byte[] expected)
{
Assert.AreEqual(expected, TripleDes.TripleDesEncrypt(key1, key2, key3, data));
Assert.AreEqual(data, TripleDes.TripleDesDecrypt(key1, key2, key3, expected));
}
