DesEdeParameters
using System;
namespace Org.BouncyCastle.Crypto.Parameters
{
public class DesEdeParameters : DesParameters
{
public const int DesEdeKeyLength = 24;
private static byte[] FixKey(byte[] key, int keyOff, int keyLen)
{
byte[] array = new byte[24];
switch (keyLen) {
case 16:
Array.Copy(key, keyOff, array, 0, 16);
Array.Copy(key, keyOff, array, 16, 8);
break;
case 24:
Array.Copy(key, keyOff, array, 0, 24);
break;
default:
throw new ArgumentException("Bad length for DESede key: " + keyLen.ToString(), "keyLen");
}
if (IsWeakKey(array))
throw new ArgumentException("attempt to create weak DESede key");
return array;
}
public DesEdeParameters(byte[] key)
: base(FixKey(key, 0, key.Length))
{
}
public DesEdeParameters(byte[] key, int keyOff, int keyLen)
: base(FixKey(key, keyOff, keyLen))
{
}
public static bool IsWeakKey(byte[] key, int offset, int length)
{
for (int i = offset; i < length; i += 8) {
if (DesParameters.IsWeakKey(key, i))
return true;
}
return false;
}
public new static bool IsWeakKey(byte[] key, int offset)
{
return IsWeakKey(key, offset, key.Length - offset);
}
public new static bool IsWeakKey(byte[] key)
{
return IsWeakKey(key, 0, key.Length);
}
public static bool IsRealEdeKey(byte[] key, int offset)
{
if (key.Length != 16)
return IsReal3Key(key, offset);
return IsReal2Key(key, offset);
}
public static bool IsReal2Key(byte[] key, int offset)
{
bool flag = false;
for (int i = offset; i != offset + 8; i++) {
flag |= (key[i] != key[i + 8]);
}
return flag;
}
public static bool IsReal3Key(byte[] key, int offset)
{
bool flag = false;
bool flag2 = false;
bool flag3 = false;
for (int i = offset; i != offset + 8; i++) {
flag |= (key[i] != key[i + 8]);
flag2 |= (key[i] != key[i + 16]);
flag3 |= (key[i + 8] != key[i + 16]);
}
return flag & flag2 & flag3;
}
}
}