private int j; // Key indexer
public RC2Transform(RC2 rc2Algo, bool encryption, byte[] key, byte[] iv)
: base(rc2Algo, encryption, iv)
{
#if ONLY_1_1
if (key == null)
{
throw new ArgumentNullException("key");
}
#endif
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));
}
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="key">密钥</param>
/// <param name="iv">矢量</param>
public RC2(string key, string iv)
{
this.key = key;
this.iv = iv;
mCrypto = new RC2CryptoServiceProvider();
mCrypto.Key = GetLegalKey();
mCrypto.IV = GetLegalIV();
mCrypto.Mode = CipherMode.CBC;//CBC模式加密
mCrypto.Padding = PaddingMode.PKCS7;
}
public RC2Transform(RC2 rc2Algo, bool encryption, byte[] key, byte[] iv) : base(rc2Algo, encryption, iv)
{
int num = rc2Algo.EffectiveKeySize;
if (key == null)
{
key = KeyBuilder.Key(rc2Algo.KeySize >> 3);
}
else
{
key = (byte[])key.Clone();
num = Math.Min(num, key.Length << 3);
}
int num2 = key.Length;
if (!KeySizes.IsLegalKeySize(rc2Algo.LegalKeySizes, num2 << 3))
{
string text = Locale.GetText("Key is too small ({0} bytes), it should be between {1} and {2} bytes long.", new object[]
{
num2,
5,
16
});
throw new CryptographicException(text);
}
byte[] array = new byte[128];
int num3 = num + 7 >> 3;
int num4 = 255 % (2 << 8 + num - (num3 << 3) - 1);
for (int i = 0; i < num2; i++)
{
array[i] = key[i];
}
for (int j = num2; j < 128; j++)
{
array[j] = RC2Transform.pitable[(int)(array[j - 1] + array[j - num2] & byte.MaxValue)];
}
array[128 - num3] = RC2Transform.pitable[(int)array[128 - num3] & num4];
for (int k = 127 - num3; k >= 0; k--)
{
array[k] = RC2Transform.pitable[(int)(array[k + 1] ^ array[k + num3])];
}
this.K = new ushort[64];
int num5 = 0;
for (int l = 0; l < 64; l++)
{
this.K[l] = (ushort)((int)array[num5++] + ((int)array[num5++] << 8));
}
}
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));
}
public RC2CryptoServiceProvider()
{
_impl = RC2.Create();
_impl.FeedbackSize = 8;
}
/// <summary>Creates an instance of a cryptographic object to perform the <see cref="T:System.Security.Cryptography.RC2" /> algorithm.</summary>
/// <returns>An instance of a cryptographic object.</returns>
/// <exception cref="T:System.Reflection.TargetInvocationException">The algorithm was used with Federal Information Processing Standards (FIPS) mode enabled, but is not FIPS compatible.</exception>
// Token: 0x0600224A RID: 8778 RVA: 0x00079284 File Offset: 0x00077484
public new static RC2 Create()
{
return(RC2.Create("System.Security.Cryptography.RC2"));
}
