AES加密解密以及测试

￡神魔★判官ぃ 2022-05-14 08:04 262阅读 0赞

import java.io.IOException;  
import java.io.UnsupportedEncodingException;  
import java.security.InvalidKeyException;  
import java.security.NoSuchAlgorithmException;  
import java.security.SecureRandom;  
import javax.crypto.BadPaddingException;  
import javax.crypto.Cipher;  
import javax.crypto.IllegalBlockSizeException;  
import javax.crypto.KeyGenerator;  
import javax.crypto.NoSuchPaddingException;  
import javax.crypto.SecretKey;  
import javax.crypto.spec.SecretKeySpec;  
import sun.misc.BASE64Decoder;  
import sun.misc.BASE64Encoder;  
public class TestAes2 \{  
private static final String encodeRules = “liguohui”;

/**
         * 加密
         * 1.构造密钥生成器
         * 2.根据ecnodeRules规则初始化密钥生成器
         * 3.产生密钥
         * 4.创建和初始化密码器
         * 5.内容加密
         * 6.返回字符串
         */

public static String AESEncode(String content) {
                try {
                    //1.构造密钥生成器，指定为AES算法,不区分大小写
                    KeyGenerator keygen = KeyGenerator.getInstance("AES");
                    //2.根据ecnodeRules规则初始化密钥生成器
                    //生成一个128位的随机源,根据传入的字节数组
                    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
                    random.setSeed(encodeRules.getBytes());
                    keygen.init(128, random);
                    //3.产生原始对称密钥
                    SecretKey original_key = keygen.generateKey();
                    //4.获得原始对称密钥的字节数组
                    byte[] raw = original_key.getEncoded();
                    //5.根据字节数组生成AES密钥
                    SecretKey key = new SecretKeySpec(raw, "AES");
                    //6.根据指定算法AES自成密码器
                    Cipher cipher = Cipher.getInstance("AES");
                    //7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密解密(Decrypt_mode)操作，第二个参数为使用的KEY
                    cipher.init(Cipher.ENCRYPT_MODE, key);
                    //8.获取加密内容的字节数组(这里要设置为utf-8)不然内容中如果有中文和英文混合中文就会解密为乱码
                    byte[] byte_encode = content.getBytes("utf-8");
                    //9.根据密码器的初始化方式--加密：将数据加密
                    byte[] byte_AES = cipher.doFinal(byte_encode);
                    //10.将加密后的数据转换为字符串
                    //这里用Base64Encoder中会找不到包
                    //解决办法：
                    //在项目的Build path中先移除JRE System Library，再添加库JRE System Library，重新编译后就一切正常了。
                    String AES_encode = new String(new BASE64Encoder().encode(byte_AES));
                    //11.将字符串返回
                    return AES_encode;
                } catch (NoSuchAlgorithmException e) {
                    e.printStackTrace();
                } catch (NoSuchPaddingException e) {
                    e.printStackTrace();
                } catch (InvalidKeyException e) {
                    e.printStackTrace();
                } catch (IllegalBlockSizeException e) {
                    e.printStackTrace();
                } catch (BadPaddingException e) {
                    e.printStackTrace();
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                //如果有错就返加nulll
                return null;
            }

/**
         * AES加密
         * @param content 待加密的内容
         * @param encryptKey 加密密钥
         * @return 加密后的byte[]
         * @throws Exception
         */

public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                kgen.init(128, new SecureRandom(encryptKey.getBytes()));
    
                Cipher cipher = Cipher.getInstance("AES");
                cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
    
                return cipher.doFinal(content.getBytes("utf-8"));
            }

/**
         * 解密
         * 解密过程：
         * 1.同加密1-4步
         * 2.将加密后的字符串反纺成byte[]数组
         * 3.将加密内容解密
         */

public static String AESDecode(String content) {
                try {
                    //1.构造密钥生成器，指定为AES算法,不区分大小写
                    KeyGenerator keygen = KeyGenerator.getInstance("AES");
                    //2.根据ecnodeRules规则初始化密钥生成器
                    //生成一个128位的随机源,根据传入的字节数组
                    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
                    random.setSeed(encodeRules.getBytes());
                    keygen.init(128, random);
                    //3.产生原始对称密钥
                    SecretKey original_key = keygen.generateKey();
                    //4.获得原始对称密钥的字节数组
                    byte[] raw = original_key.getEncoded();
                    //5.根据字节数组生成AES密钥
                    SecretKey key = new SecretKeySpec(raw, "AES");
                    //6.根据指定算法AES自成密码器
                    Cipher cipher = Cipher.getInstance("AES");
                    //7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密(Decrypt_mode)操作，第二个参数为使用的KEY
                    cipher.init(Cipher.DECRYPT_MODE, key);
                    //8.将加密并编码后的内容解码成字节数组
                    byte[] byte_content = new BASE64Decoder().decodeBuffer(content);
                    /*
                     * 解密
                     */
                    byte[] byte_decode = cipher.doFinal(byte_content);
                    String AES_decode = new String(byte_decode, "utf-8");
                    return AES_decode;
                } catch (NoSuchAlgorithmException e) {
                    e.printStackTrace();
                } catch (NoSuchPaddingException e) {
                    e.printStackTrace();
                } catch (InvalidKeyException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (IllegalBlockSizeException e) {
                    e.printStackTrace();
                } catch (BadPaddingException e) {
                    e.printStackTrace();
                }
                //如果有错就返加nulll
                return null;
            }

/**
         * AES解密
         * @param encryptBytes 待解密的byte[]
         * @param decryptKey 解密密钥
         * @return 解密后的String
         * @throws Exception
         */

public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                kgen.init(128, new SecureRandom(decryptKey.getBytes()));
    
                Cipher cipher = Cipher.getInstance("AES");
                cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
                byte[] decryptBytes = cipher.doFinal(encryptBytes);
    
                return new String(decryptBytes);
            }

public static void main(String[] args) {
    
                String rootkey = "test";
                System.out.println("加密之前的字符串:"+rootkey);
                String s = AESEncode(rootkey);
                System.out.println("加密之后形成的字符串"+s+"  长度:"+s.length());
                String s1 = AESDecode(s);
                System.out.println("解密之后的结果:"+s1);
            }

}

在这里使用的场景是AES和Base64双重加密,当先使用AES加密之后再使用Base64加密,在你解密的时候要先通过Base64解密算法进行解密,然后再通过AES进行解密.