【Java】AES加机解密工具类代码
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public final class AES {
//加密
public static String encrypt(String content, String key) throws Exception {
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(generateKey(key).getEncoded(), "AES"));
byte[] b = cipher.doFinal(content.getBytes("UTF-8"));
if (b == null || b.length == 0) {
return "";
}
StringBuffer buf = new StringBuffer();
for (int i = 0; i < b.length; i++) {
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
buf.append(hex.toUpperCase());
}
return buf.toString();
}
//解密
public static String decrypt(String content, String key) throws Exception {
if (content == null || content.length() == 0) {
return null;
}
byte[] b = 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);
b[i] = (byte) (high * 16 + low);
}
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(generateKey(key).getEncoded(), "AES"));
return new String(cipher.doFinal(b));
}
private static SecretKey generateKey(String key) throws NoSuchAlgorithmException {
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
KeyGenerator kg = KeyGenerator.getInstance("AES");
secureRandom.setSeed(key.getBytes());
kg.init(128, secureRandom);
return kg.generateKey();
}
//测试
public static void main(String[] args) {
try {
String str = "AES测试";
String secretKey = "秘钥";
System.out.println("秘钥:" + secretKey);
System.out.println("明文:" + str);
String str0 = encrypt(str, secretKey);
System.out.println("密文:" + str0);
System.out.println("解密:" + decrypt(str0, secretKey));
} catch (Exception e) {
e.printStackTrace();
}
}
}
原文链接: https://www.yukx.com/javadev/article/details/1986.html 优科学习网AES加解密-JAVA代码
