/**
* initialise the signer for signing or verification.
*
* @param forSigning true if for signing, false otherwise
* @param parameters necessary parameters.
*/
public void init(boolean forSigning, CipherParameters parameters) {
this.forSigning = forSigning;
AsymmetricKeyParameter k;
if (parameters instanceof ParametersWithRandom) {
k = (AsymmetricKeyParameter) ((ParametersWithRandom) parameters).getParameters();
} else {
k = (AsymmetricKeyParameter) parameters;
}
if (forSigning && !k.isPrivate()) {
throw new IllegalArgumentException("signing requires private key");
}
if (!forSigning && k.isPrivate()) {
throw new IllegalArgumentException("verification requires public key");
}
reset();
rsaEngine.init(forSigning, parameters);
}
