AESEncrypter加密算法代码示例

package testJava.java;

import java.security.SecureRandom;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/**
 * @Author xx
 * @Date 2014年3月26日
 * @Comments （美国软件出口限制，AES算法，秘钥长度大于128位时需替换对应jdk版本的policy文件： ${java_home}/jre/lib/security/local_policy.jar 和 ${java_home}/jre/lib/security/US_export_policy.jar）
 */
public class AESEncrypter {
    private static final String ENCODEING = "UTF-8";
    private static final String ALGORITHM = "AES";
    private static final String KEY = "2016aes";
    
    private static Cipher cipher_encrypt = null;//加密密码器
    private static Cipher cipher_decrypt = null;//解密密码器
    
    static{
        try {
            KeyGenerator kgen = KeyGenerator.getInstance(ALGORITHM);
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );  
            secureRandom.setSeed(KEY.getBytes());
            kgen.init(128, secureRandom); 
            //kgen.init(256, secureRandom);//256位长度秘钥
            SecretKey secretKey = kgen.generateKey();
            byte[] secretKeyEncoded = secretKey.getEncoded();
            SecretKeySpec sks = new SecretKeySpec(secretKeyEncoded, ALGORITHM);
            cipher_encrypt = Cipher.getInstance(ALGORITHM);
            cipher_encrypt.init(Cipher.ENCRYPT_MODE, sks);
            cipher_decrypt = Cipher.getInstance(ALGORITHM);
            cipher_decrypt.init(Cipher.DECRYPT_MODE, sks);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 加密
     * @param content 需要加密的内容
     * @return
     */
    public static String encrypt(String content) throws Exception{
            byte[] result = cipher_encrypt.doFinal(content.getBytes(ENCODEING));
//            return  Base64.encodeBase64String(result);
            return new String(Base64.getEncoder().encode(result));
    }
    
    /**
     * 解密
     * @param content
     * @return
     * @throws Exception
     */
    public static String decrypt(String content) throws Exception {
        byte[] result =  cipher_decrypt.doFinal(Base64.getDecoder().decode(content));
//            byte[] result =  cipher_decrypt.doFinal(Base64.decodeBase64(content));
            return new String(result,ENCODEING);
    }
    
    /**
     * 对字符串数组里的字符串加密
     * @param content
     * @return
     * @throws Exception
     */
    public static String[] encryptStrArray(String ...content) throws Exception{
        for (int i = 0; i < content.length; i++) {
            byte[] result = cipher_encrypt.doFinal(content[i].getBytes(ENCODEING));
//            String encryptedStr = Base64.encodeBase64String(result);
            String encryptedStr = new String(Base64.getEncoder().encode(result));
            content[i] = encryptedStr;
        }
        return content;
    }


    public static void main(String[] args) throws Exception {
        String content = "公布修改五部法律";  //加密   
        System.out.println("加密前：" + content);  
        String codeStr = encrypt(content);
        System.out.println("加密后：" + codeStr);  
        System.out.println("加密后 length：" + codeStr.getBytes("UTF-8").length);
        //解密   
        String decryptResult = decrypt(codeStr);  
        System.out.println("解密后：" + decryptResult);
        
        System.out.println("done!");
    }
    /**
     * 加密前：公布修改五部法律
        加密后：B2Pu0KBO/FGuttUxSpT9/544jgp4OEoL8L4o4N85a0I=
        加密后 length：44
        解密后：公布修改五部法律
        done!
     */

}