public static CTR @new(IBlockCipher cipher, _counter counter)
{
CTR ctr = new CTR();
ctr.ucipher = cipher;
ctr.counter = counter;
ctr.counterOut = new byte[counter.Length];
ctr.count = 0;
return ctr;
}
private static CAST @new(string key, int mode, string IV, int segment_size, _counter counter)
{
if (key.Length == 0)
{
throw PythonOps.ValueError("Key cannot be the null string");
}
if (IV.Length > 0 && IV.Length != block_size)
{
throw PythonOps.ValueError("IV must be {0} bytes long", block_size);
}
if (counter != null && mode != MODE_CTR)
{
throw PythonOps.ValueError("'counter' parameter only useful with CTR mode");
}
CAST cast = new CAST();
IBlockCipher cipher = CAST_ECB.@new(key);
if (mode == MODE_CBC)
{
cast.mcipher = CBC.@new(cipher, IV);
}
else if (mode == MODE_CFB)
{
cast.mcipher = CFB.@new(cipher, IV, segment_size);
}
else if (mode == MODE_OFB)
{
cast.mcipher = OFB.@new(cipher, IV);
}
else if (mode == MODE_CTR)
{
if (counter == null)
{
throw PythonOps.TypeError("'counter' keyword parameter is required with CTR mode");
}
cast.mcipher = CTR.@new(cipher, counter);
}
else if (mode == MODE_ECB)
{
cast.mcipher = cipher;
}
else
{
throw PythonOps.ValueError("Unknown cipher feedback mode {0}", mode);
}
cast.bitcount = cast.blocksize * 8;
cast.key = StringBytes.StringToBytes(key);
if (IV != null)
{
cast.IV = StringBytes.StringToBytes(IV);
}
cast.mode = mode;
return (CAST)cast;
}
public static CAST @new(string key, int mode, string IV, _counter counter)
{
CAST cast = CAST.@new(key, mode, IV, 8, counter);
return (CAST)cast;
}
public static DES @new(string key, int mode, string IV, _counter counter)
{
DES des = DES.@new(key, mode, IV, 8, counter);
return (DES) des;
}
private static ARC2 @new(string key, int mode, string IV, int segment_size, _counter counter, int effective_keylen)
{
if (key.Length == 0)
{
throw PythonOps.ValueError("Key cannot be the null string");
}
if (IV.Length > 0 && IV.Length != block_size)
{
throw PythonOps.ValueError("IV must be {0} bytes long", block_size);
}
if (counter != null && mode != MODE_CTR)
{
throw PythonOps.ValueError("'counter' parameter only useful with CTR mode");
}
if (effective_keylen < 0 || effective_keylen > 1024)
{
throw PythonOps.ValueError("RC2: effective_keylen must be between 0 and 1024, not {0}", effective_keylen);
}
ARC2 arc2 = new ARC2();
arc2.effective_keylen = effective_keylen;
IBlockCipher cipher = ARC2_ECB.@new(key, effective_keylen);
if (mode == MODE_CBC)
{
arc2.mcipher = CBC.@new(cipher, IV);
}
else if (mode == MODE_CFB)
{
arc2.mcipher = CFB.@new(cipher, IV, segment_size);
}
else if (mode == MODE_OFB)
{
arc2.mcipher = OFB.@new(cipher, IV);
}
else if (mode == MODE_CTR)
{
if (counter == null)
{
throw PythonOps.TypeError("'counter' keyword parameter is required with CTR mode");
}
arc2.mcipher = CTR.@new(cipher, counter);
}
else if (mode == MODE_ECB)
{
arc2.mcipher = cipher;
}
else
{
throw PythonOps.ValueError("Unknown cipher feedback mode {0}", mode);
}
arc2.bitcount = arc2.blocksize * 8;
arc2.key = StringBytes.StringToBytes(key);
if (arc2.key.Length > 128)
{
throw PythonOps.ValueError("ARC2 key length must be less than 128 bytes");
}
if (IV != null)
{
arc2.IV = StringBytes.StringToBytes(IV);
}
arc2.mode = mode;
return (ARC2)arc2;
}
public static ARC2 @new(string key, int mode, string IV, _counter counter)
{
ARC2 arc2 = ARC2.@new(key, mode, IV, 8, counter, 1024);
return (ARC2)arc2;
}
public static Blowfish @new(string key, int mode, string IV, _counter counter)
{
Blowfish blf = Blowfish.@new(key, mode, IV, 8, counter);
return (Blowfish) blf;
}
public static DES3 @new(string key, int mode, string IV, _counter counter)
{
DES3 des3 = DES3.@new(key, mode, IV, 8, counter);
return (DES3) des3;
}
public static _counter _newBE(string prefix, string suffix, string initval,
bool allow_wraparound, bool disable_shortcut)
{
_counter c = new _counter();
CheckArgs(prefix, suffix, initval);
c.nbytes = initval.Length + prefix.Length + suffix.Length;
c.prefix = StringBytes.StringToBytes(prefix);
c.suffix = StringBytes.StringToBytes(suffix);
c.val = new byte[initval.Length];
byte[] binitval = StringBytes.StringToBytes(initval);
Buffer.BlockCopy(binitval, 0, c.val, 0, c.val.Length);
c.allow_wraparound = allow_wraparound;
c.disable_shortcut = disable_shortcut;
c.little_endian = false;
c.carry = 0;
return c;
}
private static AES @new(string key, int mode, string IV, int segment_size, _counter counter)
{
if (key.Length == 0)
{
throw PythonOps.ValueError("Key cannot be the null string");
}
if (IV.Length > 0 && IV.Length != block_size)
{
throw PythonOps.ValueError("IV must be {0} bytes long", block_size);
}
if (counter != null && mode != MODE_CTR)
{
throw PythonOps.ValueError("'counter' parameter only useful with CTR mode");
}
AES aes = new AES();
IBlockCipher cipher = AES_ECB.@new(key);
if (mode == MODE_CBC)
{
aes.mcipher = CBC.@new(cipher, IV);
}
else if (mode == MODE_CFB)
{
aes.mcipher = CFB.@new(cipher, IV, segment_size);
}
else if (mode == MODE_OFB)
{
aes.mcipher = OFB.@new(cipher, IV);
}
else if (mode == MODE_CTR)
{
if (counter == null)
{
throw PythonOps.TypeError("'counter' keyword parameter is required with CTR mode");
}
// don't know how to check if counter is callable
aes.mcipher = CTR.@new(cipher, counter);
}
else if (mode == MODE_ECB)
{
aes.mcipher = cipher;
}
else
{
throw PythonOps.ValueError("Unknown cipher feedback mode {0}", mode);
}
aes.bitcount = aes.blocksize * 8;
aes.key = StringBytes.StringToBytes(key);
if (IV != null)
{
aes.IV = StringBytes.StringToBytes(IV);
}
aes.mode = mode;
return (AES) aes;
}
public static AES @new(string key, int mode, string IV, _counter counter)
{
AES aes = AES.@new(key, mode, IV, 8, counter);
return (AES) aes;
}
