AES加密使用
import java.security.SecureRandom;
import javax.crypto.*;
import javax.crypto.spec.*;
public class AesCrypto {
/**将二进制转换成16进制
* @param buf
* @return
*/
public 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();
}
/**将16进制转换为二进制
* @param hexStr
* @return
*/
public 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;
}
/**
* 加密
* @param content 需要加密的内容
* @param password 加密密码
* @return String 十进制数字字符串
*/
public static String encrypt(String content, String password) {
String result = null;
try {
// Get the KeyGenerator
KeyGenerator kgen = KeyGenerator.getInstance("AES");
//kgen.init(128); // 192 and 256 bits may not be available
kgen.init(128, new SecureRandom(password.getBytes()));
// Generate the secret key specs.
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
// Instantiate the cipher(创建密码器)
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(content.getBytes());
result =parseByte2HexStr(encrypted);
//System.out.println("加密的结果:" + result);
} catch (Exception e) {
e.printStackTrace();
System.out.println("加密:出现错误!!!");
}
return result;
}
/**解密
* @param content 待解密内容
* @param password 解密密钥
* @return String 字符串
*/
public static String decrypt(String content, String password) {
String result = null;
try {
// Get the KeyGenerator
KeyGenerator kgen = KeyGenerator.getInstance("AES");
//kgen.init(128); // 192 and 256 bits may not be available
kgen.init(128, new SecureRandom(password.getBytes()));
// Generate the secret key specs.
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
// Instantiate the cipher(创建密码器)
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(parseHexStr2Byte(content));
result =new String(encrypted);
//System.out.println("解密结果:" + result);
} catch (Exception e) {
e.printStackTrace();
System.out.println("解密:出现错误!!!");
}
return result;
}
public static void main(String[] args) throws Exception {
String content ="TEST";
String password ="123455";
System.out.println("====================================");
System.out.println("原文:" + content);
System.out.println("密匙:" + password);
System.out.println("====================================");
String en =AesCrypto.encrypt(content, password);
System.out.println("加密:" + en);
System.out.println("====================================");
String de =AesCrypto.decrypt(en, "123455");
System.out.println("解密:" + de);
//System.out.println("原文长度: " + content.length());
}
}