Java DES加密和解密简单总结

DES常用加密模式:

  • ECB模式:电子密本方式
  • CBC模式:密文分组链接方式

DES加密填充模式:

  • NoPadding:算法本身不填充,
  • PKCS5Padding:Java和C#默认的填充模式,对加密数据字节长度对8取余为r,如r大于0,则补8-r个字节,字节为8-r的值;如果r等于0,则补8个字节8
  • ISO10126Padding

Java代码的实现

  • DES加密
//此处的key只能是长度为8的字符串,否则会出现异常
public byte[] DESEncrype(byte[] data, String key) throws Exception {
    byte[] keyArr = key.getBytes();
    DESKeySpec desKey = new DESKeySpec(keyArr);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey secureKey = keyFactory.generateSecret(desKey);
    Cipher cipher = Cipher.getInstance("DES/CBC/ISO10126Padding");
    //DES算法要求有一个可信任的随机数源,此处使用new IvParameterSpec(keyArr)
    //尽量不要使用SecureRandom random = new SecureRandom(),因为可能导致跨语言无法正确解密
    cipher.init(Cipher.ENCRYPT_MODE, secureKey, new IvParameterSpec(keyArr));
    return cipher.doFinal(data);
}
  • DES解密
public static byte[] DESDecrypt(byte[] src, String key) throws Exception {
    byte[] keyArr = key.getBytes();
    DESKeySpec desKey = new DESKeySpec(keyArr);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey secureKey = keyFactory.generateSecret(desKey);
    Cipher cipher = Cipher.getInstance("DES/CBC/ISO10126Padding");
    cipher.init(Cipher.DECRYPT_MODE, secureKey, new IvParameterSpec(keyArr));
    return cipher.doFinal(src);
}

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