java使用bouncycastle加解密

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java使用bouncycastle加解密

jdk默认带了一些常见的加解密方式，当我们常见的加解密不能满足时，就需要用到一些第三方的库了，bouncycastle就是其中一种。

但是bouncycastle文档比较少。简单介绍一下写法

1.导入依赖

   <dependency><groupId>org.bouncycastle</groupId><artifactId>bcprov-jdk15on</artifactId><version>1.69</version></dependency>

2.写代码

常见的有两种方式，一种使用BouncyCastleProvider，另一种使用BlockCipherEngine

BouncyCastleProvider使用方式跟原生jdk类似，多数getInstance的地方指定一下provider就行

BouncyCastleProvider方式DES加解密代码如下

package com.vvvtimes.demo.util.endecrypt;import lombok.extern.slf4j.Slf4j;
import org.bouncycastle.jce.provider.BouncyCastleProvider;import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import java.security.Key;
import java.security.NoSuchAlgorithmException;@Slf4j
public class BcDesUtil {private static final BouncyCastleProvider provider;//BouncyCastle与JDK加解密类区别//KeyFactory.getInstance("RSA"); +provider-->KeyFactory.getInstance("RSA", provider)//Cipher.getInstance("RSA");  +provider-->Cipher.getInstance("RSA", provider)//Signature.getInstance("SHA1withRSA"); +provider-->Signature.getInstance("SHA1withRSA", provider);//KeyGenerator.getInstance("DES") ; +provider-->KeyGenerator.getInstance("DES", provider); 或者KeyGenerator.getInstance("DES","BC")/*** 偏移变量，固定占8位字节*/private final static String IV_PARAMETER = "12345678";/** 生成key*/public byte[] generateKey() {KeyGenerator keyGenerator = null;try {keyGenerator = KeyGenerator.getInstance("DES",provider);keyGenerator.init(56);SecretKey secretKey = keyGenerator.generateKey();byte[] encoded = secretKey.getEncoded();return encoded;} catch (NoSuchAlgorithmException e) {e.printStackTrace();}return null;}/*** 生成key** @param password 密钥字符串* @return 密钥对象* @throws Exception*/private static Key convertKey(byte[] password) throws Exception {DESKeySpec dks = new DESKeySpec(password);SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES",provider);return keyFactory.generateSecret(dks);}/*** DES加密*/public static byte[] encrypt(byte[] data, byte[] password) {if (password == null || password.length < 8) {throw new RuntimeException("加密失败，key不能小于8位");}if (data == null)return null;try {Key secretKey = convertKey(password);Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding",provider);IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes("utf-8"));cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);byte[] bytes = cipher.doFinal(data);return bytes;} catch (Exception e) {e.printStackTrace();return data;}}/*** DES解密解密字符串*/public static byte[] decrypt(byte[] data, byte[] password) {if (password == null || password.length < 8) {throw new RuntimeException("加密失败，key不能小于8位");}if (data == null)return null;try {Key secretKey = convertKey(password);Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding",provider);IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes("utf-8"));cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);byte[] bytes = cipher.doFinal(data);return bytes;} catch (Exception e) {e.printStackTrace();return data;}}/*** byte数组转十六进制** @param bytes* @return*/public static String byte2HexString(byte[] bytes) {StringBuilder hex = new StringBuilder();if (bytes != null) {for (Byte b : bytes) {hex.append(String.format("%02X", b.intValue() & 0xFF));}}return hex.toString();}//测试public static void main(String[] args) throws Exception {String source = "admin测试信息1234!@#$%^&*()_+";System.out.println("原  文: " + source);String password = "lw112190@2023";byte[] encryptDataBytes = encrypt(source.getBytes("utf-8"), password.getBytes("utf-8"));String encryptData = byte2HexString(encryptDataBytes);System.out.println("加密后: " + encryptData);byte[] decryptDataBytes = decrypt(encryptDataBytes, password.getBytes("utf-8"));String decryptData = new String(decryptDataBytes, "utf-8");;System.out.println("解密后: " + decryptData);}static {provider = new BouncyCastleProvider();}
}

BlockCipherEngine方式的DES加解密代码如下

package com.vvvtimes.demo.util.endecrypt;import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.engines.DESEngine;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.paddings.PKCS7Padding;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.params.DESParameters;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.jce.provider.BouncyCastleProvider;import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;public class BcDesEngineUtil {private final static BlockCipher engine;private static final BouncyCastleProvider provider;/*** 偏移变量，固定占8位字节*/private final static String IV_PARAMETER = "12345678";/*** 生成key** @param password 密钥字符串* @return 密钥对象* @throws Exception*/private static byte[] convertKeyEncoded(byte[] password) {byte[] result = null;try {DESKeySpec dks  = new DESKeySpec(password);SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES",provider);SecretKey secretKey = keyFactory.generateSecret(dks);return secretKey.getEncoded();} catch (InvalidKeyException e) {e.printStackTrace();} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (InvalidKeySpecException e) {e.printStackTrace();}return result;}private static byte[] encrypt( byte[] ptBytes,byte[] key) throws InvalidCipherTextException, UnsupportedEncodingException {BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(engine), new PKCS7Padding());cipher.init(true, new ParametersWithIV(new DESParameters(key), IV_PARAMETER.getBytes("utf-8")));byte[] rv = new byte[cipher.getOutputSize(ptBytes.length)];int tam = cipher.processBytes(ptBytes, 0, ptBytes.length, rv, 0);cipher.doFinal(rv, tam);return rv;}private static byte[] decrypt( byte[] cipherText,byte[] key) throws InvalidCipherTextException, UnsupportedEncodingException {BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(engine), new PKCS7Padding());cipher.init(false, new ParametersWithIV(new DESParameters( key),IV_PARAMETER.getBytes("utf-8")));byte[] rv = new byte[cipher.getOutputSize(cipherText.length)];int tam = cipher.processBytes(cipherText, 0, cipherText.length, rv, 0);cipher.doFinal(rv, tam);return rv;}/*** byte数组转十六进制** @param bytes* @return*/public static String byte2HexString(byte[] bytes) {StringBuilder hex = new StringBuilder();if (bytes != null) {for (Byte b : bytes) {hex.append(String.format("%02X", b.intValue() & 0xFF));}}return hex.toString();}//测试public static void main(String[] args) throws Exception {String source = "admin测试信息1234!@#$%^&*()_+";System.out.println("原  文: " + source);String password = "lw112190@2023";//String password ="geffzhan";//String password ="lw112190";byte[] keyEncoded = convertKeyEncoded(password.getBytes("utf-8"));byte[] encryptDataBytes = encrypt(source.getBytes("utf-8"), keyEncoded);String encryptData = byte2HexString(encryptDataBytes);System.out.println("加密后: " + encryptData);byte[] decryptDataBytes = decrypt(encryptDataBytes, keyEncoded);String decryptData = new String(decryptDataBytes, "utf-8");;System.out.println("解密后: " + decryptData);/**原  文: admin测试信息1234!@#$%^&*()_+加密后: 1D5C21B694A9085A69BE7EA37C197D1632239545298613B944C3AC272750A519F66FB43EFEC55C89解密后: admin测试信息1234!@#$%^&*()_+*/}static {engine = new DESEngine();provider = new BouncyCastleProvider();}}

3.其他示例

AES加解密

package com.vvvtimes.demo.util.endecrypt;import lombok.extern.slf4j.Slf4j;
import org.bouncycastle.jce.provider.BouncyCastleProvider;import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.AlgorithmParameters;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidParameterSpecException;@Slf4j
public class BcAesUtil {private static final BouncyCastleProvider provider;/*** 偏移变量，固定占8位字节*/private final static String IV_PARAMETER = "1234567890123456";/*** AES加密*/public static byte[] encrypt(byte[] data, byte[] password, byte[] iv) {if (data == null)return null;try {Key secretKey = new SecretKeySpec(password,"AES");Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding",provider);AlgorithmParameters generateIV = generateIV(iv);cipher.init(Cipher.ENCRYPT_MODE, secretKey, generateIV);byte[] bytes = cipher.doFinal(data);return bytes;} catch (Exception e) {e.printStackTrace();return data;}}/*** AES解密解密字符串*/public static byte[] decrypt(byte[] data, byte[] password, byte[] iv) {if (data == null)return null;try {Key secretKey = new SecretKeySpec(password,"AES");Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding",provider);AlgorithmParameters generateIV = generateIV(iv);cipher.init(Cipher.DECRYPT_MODE, secretKey, generateIV);byte[] bytes = cipher.doFinal(data);return bytes;} catch (Exception e) {e.printStackTrace();return data;}}public static AlgorithmParameters generateIV(byte[] iv){AlgorithmParameters params = null;try {params = AlgorithmParameters.getInstance("AES");params.init(new IvParameterSpec(iv));} catch (NoSuchAlgorithmException | InvalidParameterSpecException e) {e.printStackTrace();}return params;}/*** byte数组转十六进制** @param bytes* @return*/public static String byte2HexString(byte[] bytes) {StringBuilder hex = new StringBuilder();if (bytes != null) {for (Byte b : bytes) {hex.append(String.format("%02X", b.intValue() & 0xFF));}}return hex.toString();}//测试public static void main(String[] args) throws Exception {String source = "admin测试信息1234!@#$%^&*()_+";System.out.println("原  文: " + source);String password = "passwordpassword";byte[] encryptDataBytes = encrypt(source.getBytes("utf-8"), password.getBytes("utf-8"),IV_PARAMETER.getBytes("utf-8"));String encryptData = byte2HexString(encryptDataBytes);System.out.println("加密后: " + encryptData);byte[] decryptDataBytes = decrypt(encryptDataBytes, password.getBytes("utf-8"),IV_PARAMETER.getBytes("utf-8"));String decryptData = new String(decryptDataBytes, "utf-8");System.out.println("解密后: " + decryptData);}static {provider = new BouncyCastleProvider();}
}

RSA私钥解密 签名

package com.vvvtimes.demo.util.endecrypt;import cn.hutool.core.codec.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.nio.charset.Charset;
import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;public class BcRsaUtil {private static final BouncyCastleProvider provider;private static PrivateKey getPrivateKey(String pkcs8Key) {byte[] pkcs8Keybytes = Base64.decode(pkcs8Key.getBytes(Charset.forName("UTF-8")));final PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(pkcs8Keybytes);try {return KeyFactory.getInstance("RSA", provider).generatePrivate(pkcs8EncodedKeySpec);} catch (Exception ex) {ex.printStackTrace();return null;}}/*** RSA私钥解密** @param inputByte 待解密字节数组* @param pkcs8Key  私钥* @return 明文*/public static byte[] decrypt(byte[] inputByte, String pkcs8Key) {byte[] outputeByte = null;try {PrivateKey privateKey = getPrivateKey(pkcs8Key);//RSA解密Cipher cipher = Cipher.getInstance("RSA", provider);cipher.init(Cipher.DECRYPT_MODE, privateKey);outputeByte = cipher.doFinal(inputByte);} catch (NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException | NoSuchAlgorithmException e) {e.printStackTrace();}return outputeByte;}public static byte[] sign(final byte[] array, String pkcs8Key) {try {PrivateKey privateKey = getPrivateKey(pkcs8Key);final Signature instance = Signature.getInstance("SHA1withRSA", provider);instance.initSign(privateKey);instance.update(array);return instance.sign();} catch (GeneralSecurityException ex) {throw new RuntimeException("License Server installation error 0000000F2", ex);}}static {provider = new BouncyCastleProvider();}
}

实际上bouncycastle还支持部分国密算法，这一部分不用自己写实现了。