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!
*/

}