/** construct a key and iv (if necessary) suitable for use with a Cipher. */
public static CipherParameters makePBEParameters(
PBEKeySpec keySpec, int type, int hash, int keySize, int ivSize) {
PBEParametersGenerator generator = makePBEGenerator(type, hash);
byte[] key;
CipherParameters param;
if (type == PKCS12) {
key = PBEParametersGenerator.PKCS12PasswordToBytes(keySpec.getPassword());
} else {
key = PBEParametersGenerator.PKCS5PasswordToBytes(keySpec.getPassword());
}
generator.init(key, keySpec.getSalt(), keySpec.getIterationCount());
if (ivSize != 0) {
param = generator.generateDerivedParameters(keySize, ivSize);
} else {
param = generator.generateDerivedParameters(keySize);
}
for (int i = 0; i != key.length; i++) {
key[i] = 0;
}
return param;
}
/**
* generate a PBE based key suitable for a MAC algorithm, the key size is chosen according the
* MAC size, or the hashing algorithm, whichever is greater.
*/
public static CipherParameters makePBEMacParameters(
PBEKeySpec keySpec, int type, int hash, int keySize) {
PBEParametersGenerator generator = makePBEGenerator(type, hash);
byte[] key;
CipherParameters param;
key = convertPassword(type, keySpec);
generator.init(key, keySpec.getSalt(), keySpec.getIterationCount());
param = generator.generateDerivedMacParameters(keySize);
for (int i = 0; i != key.length; i++) {
key[i] = 0;
}
return param;
}