internal static byte[] GetStrongKey()
{
byte[] key = KeyBuilder.Key(DESTransform.KEY_BYTE_SIZE);
while (DES.IsWeakKey(key) || DES.IsSemiWeakKey(key))
{
key = KeyBuilder.Key(DESTransform.KEY_BYTE_SIZE);
}
return(key);
}
private int j; // Key indexer
public RC2Transform(RC2 rc2Algo, bool encryption, byte[] key, byte[] iv)
: base(rc2Algo, encryption, iv)
{
int t1 = rc2Algo.EffectiveKeySize;
if (key == null)
{
key = KeyBuilder.Key(rc2Algo.KeySize >> 3);
}
else
{
key = (byte[])key.Clone();
t1 = Math.Min(t1, key.Length << 3);
}
int t = key.Length;
if (!KeySizes.IsLegalKeySize(rc2Algo.LegalKeySizes, (t << 3)))
{
string msg = Locale.GetText("Key is too small ({0} bytes), it should be between {1} and {2} bytes long.", t, 5, 16);
throw new CryptographicException(msg);
}
// Expand key into a byte array, then convert to word
// array since we always access the key in 16bit chunks.
byte[] L = new byte[128];
int t8 = ((t1 + 7) >> 3); // divide by 8
int tm = 255 % (2 << (8 + t1 - (t8 << 3) - 1));
for (int i = 0; i < t; i++)
{
L[i] = key[i];
}
for (int i = t; i < 128; i++)
{
L[i] = (byte)(pitable[(L[i - 1] + L[i - t]) & 0xff]);
}
L[128 - t8] = pitable[L[128 - t8] & tm];
for (int i = 127 - t8; i >= 0; i--)
{
L[i] = pitable[L[i + 1] ^ L[i + t8]];
}
K = new UInt16[64];
int pos = 0;
for (int i = 0; i < 64; i++)
{
K[i] = (UInt16)(L[pos++] + (L[pos++] << 8));
}
}
internal static byte[] GetStrongKey()
{
int size = DESTransform.BLOCK_BYTE_SIZE * 3;
byte[] key = KeyBuilder.Key(size);
while (TripleDES.IsWeakKey(key))
{
key = KeyBuilder.Key(size);
}
return(key);
}
public Rfc2898DeriveBytes(string password, int saltSize, int iterations)
{
if (password == null)
{
throw new ArgumentNullException("password");
}
if (saltSize < 0)
{
throw new ArgumentOutOfRangeException("invalid salt length");
}
Salt = KeyBuilder.Key(saltSize);
IterationCount = iterations;
_hmac = new HMACSHA1(Encoding.UTF8.GetBytes(password));
}
public override void GenerateKey()
{
KeyValue = KeyBuilder.Key(KeySizeValue >> 3);
}
public HMACSHA1()
: this(KeyBuilder.Key(8))
{
}
public HMACMD5()
: this(KeyBuilder.Key(8))
{
}
