/**
* set up for use with stream mode, where the key derivation function
* is used to provide a stream of bytes to xor with the message.
*
* @param agree the key agreement used as the basis for the encryption
* @param kdf the key derivation function used for byte generation
* @param mac the message authentication code generator for the message
*/
public IESEngine(
BasicAgreement agree,
DerivationFunction kdf,
Mac mac)
{
this.agree = agree;
this.kdf = kdf;
this.mac = mac;
this.macBuf = new byte[mac.getMacSize()];
this.cipher = null;
}
/**
* set up for use in conjunction with a block cipher to handle the
* message.
*
* @param agree the key agreement used as the basis for the encryption
* @param kdf the key derivation function used for byte generation
* @param mac the message authentication code generator for the message
* @param cipher the cipher to used for encrypting the message
*/
public IESEngine(
BasicAgreement agree,
DerivationFunction kdf,
Mac mac,
BufferedBlockCipher cipher)
{
this.agree = agree;
this.kdf = kdf;
this.mac = mac;
this.macBuf = new byte[mac.getMacSize()];
this.cipher = cipher;
}
