/**
* Initialise the cipher and, possibly, the initialisation vector (IV).
* If an IV isn't passed as part of the parameter, the IV will be all zeros.
*
* @param forEncryption if true the cipher is initialised for
* encryption, if false for decryption.
* @param param the key and other data required by the cipher.
* @exception IllegalArgumentException if the params argument is
* inappropriate.
*/
public void init(
bool encrypting,
CipherParameters parameters)
//throws IllegalArgumentException
{
this.encrypting = encrypting;
if (typeof(ParametersWithIV).IsInstanceOfType(parameters))
{
ParametersWithIV ivParam = (ParametersWithIV)parameters;
byte[] iv = ivParam.getIV();
if (iv.Length != blockSize)
{
throw new ArgumentException("initialisation vector must be the same length as block size");
}
Array.Copy(iv, 0, IV, 0, iv.Length);
reset();
cipher.init(encrypting, ivParam.getParameters());
}
else
{
reset();
cipher.init(encrypting, parameters);
}
}
/**
* Initialise the cipher and, possibly, the initialisation vector (IV).
* If an IV isn't passed as part of the parameter, the IV will be all zeros.
* An IV which is too short is handled in FIPS compliant fashion.
*
* @param param the key and other data required by the cipher.
* @exception ArgumentException if the params argument is
* inappropriate.
*/
public void init(
CipherParameters parameters)
//throws ArgumentException
{
//this.encrypting = true;
if (typeof(ParametersWithIV).IsInstanceOfType(parameters))
{
ParametersWithIV ivParam = (ParametersWithIV)parameters;
byte[] iv = ivParam.getIV();
if (iv.Length < IV.Length)
{
Array.Copy(iv, 0, IV, IV.Length - iv.Length, iv.Length);
}
else
{
Array.Copy(iv, 0, IV, 0, IV.Length);
}
reset();
cipher.init(true, ivParam.getParameters());
}
else
{
reset();
cipher.init(true, parameters);
}
}
public void init(bool forEncryption, CipherParameters parameters)
//throws IllegalArgumentException
{
this.encrypting = forEncryption;
if (typeof(ParametersWithIV).IsInstanceOfType(parameters))
{
ParametersWithIV ivParam = (ParametersWithIV)parameters;
byte[] iv = ivParam.getIV();
Array.Copy(iv, 0, IV, 0, IV.Length);
reset();
cipher.init(true, ivParam.getParameters());
}
}
/**
* Initialise the cipher and, possibly, the initialisation vector (IV).
* If an IV isn't passed as part of the parameter, the IV will be all zeros.
* An IV which is too short is handled in FIPS compliant fashion.
*
* @param forEncryption if true the cipher is initialised for
* encryption, if false for decryption.
* @param param the key and other data required by the cipher.
* @exception IllegalArgumentException if the params argument is
* inappropriate.
*/
public void init(
bool encrypting,
CipherParameters parameters)
//throws ArgumentException
{
this.encrypting = encrypting;
if (typeof(ParametersWithIV).IsInstanceOfType(parameters))
{
ParametersWithIV ivParam = (ParametersWithIV)parameters;
byte[] iv = ivParam.getIV();
if (iv.Length < IV.Length)
{
// prepend the supplied IV with zeros (per FIPS PUB 81)
Array.Copy(iv, 0, IV, IV.Length - iv.Length, iv.Length);
for (int i = 0; i < IV.Length - iv.Length; i++)
{
IV[i] = 0;
}
}
else
{
Array.Copy(iv, 0, IV, 0, IV.Length);
}
reset();
cipher.init(true, ivParam.getParameters());
}
else
{
reset();
cipher.init(true, parameters);
}
}