Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* Copyright 2011-2016 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.security.crypto.encrypt;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.InvalidParameterSpecException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
/**
* Static helper for working with the Cipher API.
*
* @author Keith Donald
*/
final class CipherUtils {
private CipherUtils() {
}
/**
* Generates a SecretKey.
*/
static SecretKey newSecretKey(String algorithm, String password) {
return newSecretKey(algorithm, new PBEKeySpec(password.toCharArray()));
}
/**
* Generates a SecretKey.
*/
static SecretKey newSecretKey(String algorithm, PBEKeySpec keySpec) {
try {
SecretKeyFactory factory = SecretKeyFactory.getInstance(algorithm);
return factory.generateSecret(keySpec);
}
catch (NoSuchAlgorithmException ex) {
throw new IllegalArgumentException("Not a valid encryption algorithm", ex);
}
catch (InvalidKeySpecException ex) {
throw new IllegalArgumentException("Not a valid secret key", ex);
}
}
/**
* Constructs a new Cipher.
*/
static Cipher newCipher(String algorithm) {
try {
return Cipher.getInstance(algorithm);
}
catch (NoSuchAlgorithmException ex) {
throw new IllegalArgumentException("Not a valid encryption algorithm", ex);
}
catch (NoSuchPaddingException ex) {
throw new IllegalStateException("Should not happen", ex);
}
}
/**
* Initializes the Cipher for use.
*/
static T getParameterSpec(Cipher cipher, Class parameterSpecClass) {
try {
return cipher.getParameters().getParameterSpec(parameterSpecClass);
}
catch (InvalidParameterSpecException ex) {
throw new IllegalArgumentException("Unable to access parameter", ex);
}
}
/**
* Initializes the Cipher for use.
*/
static void initCipher(Cipher cipher, int mode, SecretKey secretKey) {
initCipher(cipher, mode, secretKey, null);
}
/**
* Initializes the Cipher for use.
*/
static void initCipher(Cipher cipher, int mode, SecretKey secretKey, byte[] salt, int iterationCount) {
initCipher(cipher, mode, secretKey, new PBEParameterSpec(salt, iterationCount));
}
/**
* Initializes the Cipher for use.
*/
static void initCipher(Cipher cipher, int mode, SecretKey secretKey, AlgorithmParameterSpec parameterSpec) {
try {
if (parameterSpec != null) {
cipher.init(mode, secretKey, parameterSpec);
}
else {
cipher.init(mode, secretKey);
}
}
catch (InvalidKeyException ex) {
throw new IllegalArgumentException("Unable to initialize due to invalid secret key", ex);
}
catch (InvalidAlgorithmParameterException ex) {
throw new IllegalStateException("Unable to initialize due to invalid decryption parameter spec", ex);
}
}
/**
* Invokes the Cipher to perform encryption or decryption (depending on the
* initialized mode).
*/
static byte[] doFinal(Cipher cipher, byte[] input) {
try {
return cipher.doFinal(input);
}
catch (IllegalBlockSizeException ex) {
throw new IllegalStateException("Unable to invoke Cipher due to illegal block size", ex);
}
catch (BadPaddingException ex) {
throw new IllegalStateException("Unable to invoke Cipher due to bad padding", ex);
}
}
}
