title: “AES加密和解密-CryptoJS和Java”
url: “https://wsk1103.github.io/”
tags:
- 學習筆記
- 算法
AES（Advanced Encryption Standard，高級加密標準）是一種對稱加密算法，加密和解密使用相同的密鑰
CryptoJS：https://github.com/brix/crypto-js
1. 前端AES加密，後端AES解密
前端
其中和加密相關的js從GitHub下載。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>AES TEST</title>
</head>
<body>
<p>go</p>
<script src="core.js"></script>
<script src="cipher-core.js"></script>
<script src="mode-ecb.js"></script>
<script src="aes.js"></script>
<script>
var key = CryptoJS.enc.Utf8.parse("1538663015386630");
var plaintText = 'wsk-test'; // 明文
var encrypted = "a551e4d54cfc396cc93c89dd55f6587c";
var encryptedData = CryptoJS.AES.encrypt(plaintText, key, {
mode: CryptoJS.mode.ECB,
padding: CryptoJS.pad.Pkcs7
});
var a = plaintText + '';//加密前：
var b = encryptedData + '';//加密後：
console.log("加密前："+plaintText + '');
console.log("加密後："+encryptedData + '');
alert("加密前："+a);
alert("加密後："+b);
</script>
</body>
</html>
後臺解密
/**
* PKCS5Padding -- Pkcs7 兩種padding方法都可以
*
* @param content 69f23a1a98ca3d406692742ab7033f3b 16進制
* @param key 1538663015386630
* @return masget2019
*/
public static String decryptAES(String content, String key) {
try {
SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");
// "算法/模式/補碼方式"
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
//解密後是16進制
return new String(cipher.doFinal(parseHexStr2Byte(content)));
} catch (Exception e) {
log.error(String.format("解密失敗:，content：%s, key: %s", content, key));
}
return content;
}
/**
* 將16進制轉換爲二進制
*
* @param hexStr
* @return
*/
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;
}
後臺AES加密，前端AES解密
後臺加密
/**
* 加密
*
* @param content
* @param key
* @return
*/
public static String encryptAES(String content, String key) {
try {
SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");
// "算法/模式/補碼方式"
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] result = cipher.doFinal(content.getBytes(StandardCharsets.UTF_8));
return parseByte2HexStr(result);
} catch (Exception e) {
log.error(String.format("加密失敗:，content：%s, key: %s", content, key));
}
return content;
}
/**
* 將二進制轉換成16進制
*
* @param buf
* @return
*/
public static String parseByte2HexStr(byte[] buf) {
StringBuilder sb = new StringBuilder();
for (byte b : buf) {
String hex = Integer.toHexString(b & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}
前端解密
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<script src="core.js"></script>
<script src="enc-base64.js"></script>
<script src="cipher-core.js"></script>
<script src="mode-ecb.js"></script>
<script src="aes.js"></script>
<body>
<script>
var key = CryptoJS.enc.Utf8.parse("1538663015386630"); //祕鑰
var wsk = "a551e4d54cfc396cc93c89dd55f6587c"; //後臺返回的加密字符串
var encryptedHexStr = CryptoJS.enc.Hex.parse(wsk);//a551e4d54cfc396cc93c89dd55f6587c
var encryptedBase64Str = CryptoJS.enc.Base64.stringify(encryptedHexStr);
var decryptedData = CryptoJS.AES.decrypt(encryptedBase64Str, key, {
mode: CryptoJS.mode.ECB,
padding: CryptoJS.pad.Pkcs7
});
var decryptedStr = decryptedData.toString(CryptoJS.enc.Utf8);
console.log("解密後:"+decryptedStr);
</script>
</body>
</html>
注意，前端解密中的 enc-base64.js 不能導入到加密的html裏面，否則加密後的結果不是 16進制的形式