AES加密和解密工具类

最近在做项目时候使用到了加密，在JAVA加密选择中就选择了AES加密，官方中AES描述的很高达上，但是在工作中只是用来加密在这就不详细的说明了，直接赋予案例。

1、在AES加密中最重要的就是密匙了，密匙是加密和解密最关键的。下面是我简单写的一个工具类。

2、不需要jar包；直接使用

public class MyEncryptUtils {
/**
* 加密
* 
* @param content
*            待加密内容
* @param key
*            加密的密钥
* @return
* @throws BizException
*/
public static String encrypt(String content, String key) throws Exception {


KeyGenerator kgen = KeyGenerator.getInstance("AES");


SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
random.setSeed(key.getBytes());


kgen.init(128, random);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
byte[] byteContent = content.getBytes("utf-8");
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
byte[] byteRresult = cipher.doFinal(byteContent);
StringBuffer sb = new StringBuffer();
for (int i = 0; i < byteRresult.length; i++) {
String hex = Integer.toHexString(byteRresult[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}


/**
* 解密
* 
* @param content
*            待解密内容
* @param key
*            解密的密钥
* @return
* @throws BizException
*/
public static String decrypt(String content, String key) throws Exception {
if (content.length() < 1)
return null;
byte[] byteRresult = new byte[content.length() / 2];
for (int i = 0; i < content.length() / 2; i++) {
int high = Integer.parseInt(content.substring(i * 2, i * 2 + 1), 16);
int low = Integer.parseInt(content.substring(i * 2 + 1, i * 2 + 2), 16);
byteRresult[i] = (byte) (high * 16 + low);
}
KeyGenerator kgen = KeyGenerator.getInstance("AES");


SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
random.setSeed(key.getBytes());


kgen.init(128, random);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
byte[] result = cipher.doFinal(byteRresult);
return new String(result);
}


public static void main(String[] args) throws Exception {
String input = "简单案例";   
String key  ="9588028820109132570743325311898426347857298773549468758875018579537757772163084478873699447306034466200616411960574122434059469100235892702736860872901247123456";
String encryptStr = encrypt(input, key);
String decryptStr = decrypt(encryptStr,key);
System.out.println("加密之后：" + encryptStr);
System.out.println("解密之后：" + decryptStr);
}
}

控制台输出：

加密之后：8A2FB87D23A73D54E89B1B95EAE1B039
解密之后：简单案例