http://blog.csdn.net/liyuming0000/article/details/48395139
不说别的,直接上代码:
- import it.sauronsoftware.base64.Base64;
- import java.security.MessageDigest;
- import java.security.NoSuchAlgorithmException;
- import java.security.SecureRandom;
- import java.security.Security;
- import javax.crypto.Cipher;
- import javax.crypto.KeyGenerator;
- import javax.crypto.SecretKey;
- import javax.crypto.spec.SecretKeySpec;
- import org.bouncycastle.jce.provider.BouncyCastleProvider;
- /**
- * java实现AES256加密解密
- * 依赖说明:
- * bcprov-jdk15-133.jar:PKCS7Padding
- * javabase64-1.3.1.jar:base64
- * local_policy.jar 和 US_export_policy.jar需添加到%JAVE_HOME%\jre\lib\security中(lib中版本适合jdk1.7)
- */
- public class AES256 {
- public static byte[] encrypt(String content, String password) {
- try {
- //"AES":请求的密钥算法的标准名称
- KeyGenerator kgen = KeyGenerator.getInstance("AES");
- //256:密钥生成参数;securerandom:密钥生成器的随机源
- SecureRandom securerandom = new SecureRandom(tohash256Deal(password));
- kgen.init(256, securerandom);
- //生成秘密(对称)密钥
- SecretKey secretKey = kgen.generateKey();
- //返回基本编码格式的密钥
- byte[] enCodeFormat = secretKey.getEncoded();
- //根据给定的字节数组构造一个密钥。enCodeFormat:密钥内容;"AES":与给定的密钥内容相关联的密钥算法的名称
- SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
- //将提供程序添加到下一个可用位置
- Security.addProvider(new BouncyCastleProvider());
- //创建一个实现指定转换的 Cipher对象,该转换由指定的提供程序提供。
- //"AES/ECB/PKCS7Padding":转换的名称;"BC":提供程序的名称
- Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
- cipher.init(Cipher.ENCRYPT_MODE, key);
- byte[] byteContent = content.getBytes("utf-8");
- byte[] cryptograph = cipher.doFinal(byteContent);
- return Base64.encode(cryptograph);
- } catch (Exception e) {
- e.printStackTrace();
- }
- return null;
- }
- public static String decrypt(byte[] cryptograph, String password) {
- try {
- KeyGenerator kgen = KeyGenerator.getInstance("AES");
- SecureRandom securerandom = new SecureRandom(tohash256Deal(password));
- kgen.init(256, securerandom);
- SecretKey secretKey = kgen.generateKey();
- byte[] enCodeFormat = secretKey.getEncoded();
- SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
- Security.addProvider(new BouncyCastleProvider());
- Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
- cipher.init(Cipher.DECRYPT_MODE, key);
- byte[] content = cipher.doFinal(Base64.decode(cryptograph));
- return new String(content);
- } catch (Exception e) {
- e.printStackTrace();
- }
- return null;
- }
- private static String parseByte2HexStr(byte buf[]) {
- StringBuffer sb = new StringBuffer();
- for (int i = 0; i < buf.length; i++) {
- String hex = Integer.toHexString(buf[i] & 0xFF);
- if (hex.length() == 1) {
- hex = '0' + hex;
- }
- sb.append(hex.toUpperCase());
- }
- return sb.toString();
- }
- /*private static byte[] parseHexStr2Byte(String hexStr) {
- if (hexStr.length() < 1)
- return null;
- byte[] result = new byte[hexStr.length()/2];
- for (int i = 0;i< hexStr.length()/2; i++) {
- int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);
- int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);
- result[i] = (byte) (high * 16 + low);
- }
- return result;
- }*/
- private static byte[] tohash256Deal(String datastr) {
- try {
- MessageDigest digester=MessageDigest.getInstance("SHA-256");
- digester.update(datastr.getBytes());
- byte[] hex=digester.digest();
- return hex;
- } catch (NoSuchAlgorithmException e) {
- throw new RuntimeException(e.getMessage());
- }
- }
- public static void main(String[] args) {
- String content = "0f607264fc6318a92b9e13c65db7cd3c";
- String password = "zsyy";
- System.out.println("明文:" + content);
- System.out.println("key:" + password);
- byte[] encryptResult = AES256.encrypt(content, password);
- System.out.println("密文:" + AES256.parseByte2HexStr(encryptResult));
- String decryptResult = AES256.decrypt(encryptResult, password);
- System.out.println("解密:" + decryptResult);
- }
- }