AES加密解密工具类

常用数据传输加密

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/**
* 密钥
*/
private static final String KEY = "8f2ae598bc768a12341312313121412412c9";
/**
* 偏移量
*/
private static final String OFFSET = "34b373131231241212412bfd7d4790f";
/**
* 编码
*/
private static final String ENCODING = "UTF-8";
/**
* 算法
*/
private static final String ALGORITHM = "AES";
/**
* 默认的加密算法
*/
private static final String CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";

/**
* 加密
*
* @param data
* @return
*/
public static String encrypt(String data) {
    try {
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        SecretKeySpec skeySpec = new SecretKeySpec(KEY.getBytes(StandardCharsets.US_ASCII), ALGORITHM);
        //使用CBC模式，需要一个向量iv，可增加加密算法的强度
        IvParameterSpec iv = new IvParameterSpec(OFFSET.getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(data.getBytes(ENCODING));
        //此处使用BASE64做转码
        return parseByte2HexStr(encrypted);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

/**
* 解密
*
* @param data
* @return
*/
public static String decrypt(String data) {
    try {
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        SecretKeySpec skeySpec = new SecretKeySpec(KEY.getBytes(StandardCharsets.US_ASCII), ALGORITHM);
        IvParameterSpec iv = new IvParameterSpec(OFFSET.getBytes());
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
        byte[] buffer = parseHexStr2Byte(data);
        byte[] encrypted = cipher.doFinal(buffer);
        return new String(encrypted, ENCODING);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

/**
* 将二进制转换成16进制
*
* @param buf
* @return
*/
private static String parseByte2HexStr(byte[] buf) {
    StringBuilder sb = new StringBuilder();
    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.toLowerCase());
    }
    return sb.toString();
}

/**
* 将16进制转换为二进制
*
* @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;
}

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