/** 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;
}
private static byte[] convertPassword(int type, PBEKeySpec keySpec) {
byte[] key;
if (type == PKCS12) {
key = PBEParametersGenerator.PKCS12PasswordToBytes(keySpec.getPassword());
} else if (type == PKCS5S2_UTF8 || type == PKCS5S1_UTF8) {
key = PBEParametersGenerator.PKCS5PasswordToUTF8Bytes(keySpec.getPassword());
} else {
key = PBEParametersGenerator.PKCS5PasswordToBytes(keySpec.getPassword());
}
return key;
}
/**
* Creates a PBE key from a given PBE key specification.
*
* @param key the given PBE key specification
*/
PBEKey(PBEKeySpec keySpec, String keytype) throws InvalidKeySpecException {
char[] passwd = keySpec.getPassword();
if (passwd == null) {
// Should allow an empty password.
passwd = new char[0];
}
// Accept "\0" to signify "zero-length password with no terminator".
if (!(passwd.length == 1 && passwd[0] == 0)) {
for (int i = 0; i < passwd.length; i++) {
if ((passwd[i] < '\u0020') || (passwd[i] > '\u007E')) {
throw new InvalidKeySpecException("Password is not ASCII");
}
}
}
this.key = new byte[passwd.length];
for (int i = 0; i < passwd.length; i++) this.key[i] = (byte) (passwd[i] & 0x7f);
java.util.Arrays.fill(passwd, ' ');
type = keytype;
}