public static string DecryptZMKEncryptedUnderLMK(string encryptedZMK, KeySchemeTable.KeyScheme ks, int var)
{
switch (ks)
{
case KeySchemeTable.KeyScheme.SingleDESKey:
case KeySchemeTable.KeyScheme.DoubleLengthKeyAnsi:
case KeySchemeTable.KeyScheme.TripleLengthKeyAnsi:
return(TripleDES.TripleDESDecrypt(new HexKey(Cryptography.LMK.LMKStorage.LMKVariant(LMKPairs.LMKPair.Pair04_05, var)), encryptedZMK));
case KeySchemeTable.KeyScheme.DoubleLengthKeyVariant:
case KeySchemeTable.KeyScheme.TripleLengthKeyVariant:
return(TripleDES.TripleDESDecryptVariant(new HexKey(Cryptography.LMK.LMKStorage.LMKVariant(LMKPairs.LMKPair.Pair04_05, var)), encryptedZMK));
default:
throw new InvalidOperationException("Invalid key scheme [" + ks.ToString() + "]");
}
}
public static string DecryptUnderLMK(string encryptedKey, KeySchemeTable.KeyScheme Target_KeyScheme, LMKPairs.LMKPair LMKKeyPair, string variantNumber)
{
string result = "";
switch (Target_KeyScheme)
{
case KeySchemeTable.KeyScheme.SingleDESKey:
case KeySchemeTable.KeyScheme.DoubleLengthKeyAnsi:
case KeySchemeTable.KeyScheme.TripleLengthKeyAnsi:
case KeySchemeTable.KeyScheme.Unspecified:
result = TripleDES.TripleDESDecrypt(new HexKey(Cryptography.LMK.LMKStorage.LMKVariant(LMKKeyPair, Convert.ToInt32(variantNumber))), encryptedKey);
break;
case KeySchemeTable.KeyScheme.DoubleLengthKeyVariant:
case KeySchemeTable.KeyScheme.TripleLengthKeyVariant:
result = TripleDES.TripleDESDecryptVariant(new HexKey(Cryptography.LMK.LMKStorage.LMKVariant(LMKKeyPair, Convert.ToInt32(variantNumber))), encryptedKey);
break;
default:
break;
}
switch (Target_KeyScheme)
{
case KeySchemeTable.KeyScheme.DoubleLengthKeyAnsi:
case KeySchemeTable.KeyScheme.DoubleLengthKeyVariant:
case KeySchemeTable.KeyScheme.TripleLengthKeyAnsi:
case KeySchemeTable.KeyScheme.TripleLengthKeyVariant:
result = KeySchemeTable.GetKeySchemeValue(Target_KeyScheme) + result;
break;
default:
break;
}
return(result);
}