spring security BouncyCastleAesGcmBytesEncryptor 源码

spring security BouncyCastleAesGcmBytesEncryptor 代码

文件路径：/crypto/src/main/java/org/springframework/security/crypto/encrypt/BouncyCastleAesGcmBytesEncryptor.java

/*
 * 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 org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.modes.AEADBlockCipher;
import org.bouncycastle.crypto.modes.GCMBlockCipher;
import org.bouncycastle.crypto.params.AEADParameters;

import org.springframework.security.crypto.encrypt.AesBytesEncryptor.CipherAlgorithm;
import org.springframework.security.crypto.keygen.BytesKeyGenerator;
import org.springframework.security.crypto.util.EncodingUtils;

/**
 * An Encryptor equivalent to {@link AesBytesEncryptor} using {@link CipherAlgorithm#GCM}
 * that uses Bouncy Castle instead of JCE. The algorithm is equivalent to
 * "AES/GCM/NoPadding".
 *
 * @author William Tran
 *
 */
public class BouncyCastleAesGcmBytesEncryptor extends BouncyCastleAesBytesEncryptor {

	public BouncyCastleAesGcmBytesEncryptor(String password, CharSequence salt) {
		super(password, salt);
	}

	public BouncyCastleAesGcmBytesEncryptor(String password, CharSequence salt, BytesKeyGenerator ivGenerator) {
		super(password, salt, ivGenerator);
	}

	@Override
	@SuppressWarnings("deprecation")
	public byte[] encrypt(byte[] bytes) {
		byte[] iv = this.ivGenerator.generateKey();
		GCMBlockCipher blockCipher = new GCMBlockCipher(new org.bouncycastle.crypto.engines.AESFastEngine());
		blockCipher.init(true, new AEADParameters(this.secretKey, 128, iv, null));
		byte[] encrypted = process(blockCipher, bytes);
		return (iv != null) ? EncodingUtils.concatenate(iv, encrypted) : encrypted;
	}

	@Override
	@SuppressWarnings("deprecation")
	public byte[] decrypt(byte[] encryptedBytes) {
		byte[] iv = EncodingUtils.subArray(encryptedBytes, 0, this.ivGenerator.getKeyLength());
		encryptedBytes = EncodingUtils.subArray(encryptedBytes, this.ivGenerator.getKeyLength(), encryptedBytes.length);
		GCMBlockCipher blockCipher = new GCMBlockCipher(new org.bouncycastle.crypto.engines.AESFastEngine());
		blockCipher.init(false, new AEADParameters(this.secretKey, 128, iv, null));
		return process(blockCipher, encryptedBytes);
	}

	private byte[] process(AEADBlockCipher blockCipher, byte[] in) {
		byte[] buf = new byte[blockCipher.getOutputSize(in.length)];
		int bytesWritten = blockCipher.processBytes(in, 0, in.length, buf, 0);
		try {
			bytesWritten += blockCipher.doFinal(buf, bytesWritten);
		}
		catch (InvalidCipherTextException ex) {
			throw new IllegalStateException("unable to encrypt/decrypt", ex);
		}
		if (bytesWritten == buf.length) {
			return buf;
		}
		byte[] out = new byte[bytesWritten];
		System.arraycopy(buf, 0, out, 0, bytesWritten);
		return out;
	}

}

相关信息

spring security 源码目录

相关文章

spring security AesBytesEncryptor 源码

spring security BouncyCastleAesBytesEncryptor 源码

spring security BouncyCastleAesCbcBytesEncryptor 源码

spring security BytesEncryptor 源码

spring security CipherUtils 源码

spring security Encryptors 源码

spring security HexEncodingTextEncryptor 源码

spring security TextEncryptor 源码