使用 JavaScript 扩展 DESKey

Question

我正在 Node.js 中实施一个协议。本协议采用CBC方式的3DES加密，okay

但是为了 encrypt/decrypt 我需要 spread/expand 14 字节的 DES 密钥到 16 字节只是添加奇偶校验位。但。我坚持使用 JavaScript/Node.js.

我有一些使用 C 和 Python 的实现，谁能帮我用 JavaScript/Node.js 做同样的事情（下面是我的试用版）？

uint8 *des_key_spread(uint8 *normal){
  static uint8 spread[16];

  spread[ 0] = normal[ 0] & 0xfe;
  spread[ 1] = ((normal[ 0] << 7) | (normal[ 1] >> 1)) & 0xfe;
  spread[ 2] = ((normal[ 1] << 6) | (normal[ 2] >> 2)) & 0xfe;
  spread[ 3] = ((normal[ 2] << 5) | (normal[ 3] >> 3)) & 0xfe;
  spread[ 4] = ((normal[ 3] << 4) | (normal[ 4] >> 4)) & 0xfe;
  spread[ 5] = ((normal[ 4] << 3) | (normal[ 5] >> 5)) & 0xfe;
  spread[ 6] = ((normal[ 5] << 2) | (normal[ 6] >> 6)) & 0xfe;
  spread[ 7] = normal[ 6] << 1;
  spread[ 8] = normal[ 7] & 0xfe;
  spread[ 9] = ((normal[ 7] << 7) | (normal[ 8] >> 1)) & 0xfe;
  spread[10] = ((normal[ 8] << 6) | (normal[ 9] >> 2)) & 0xfe;
  spread[11] = ((normal[ 9] << 5) | (normal[10] >> 3)) & 0xfe;
  spread[12] = ((normal[10] << 4) | (normal[11] >> 4)) & 0xfe;
  spread[13] = ((normal[11] << 3) | (normal[12] >> 5)) & 0xfe;
  spread[14] = ((normal[12] << 2) | (normal[13] >> 6)) & 0xfe;
  spread[15] = normal[13] << 1;

  des_key_parity_adjust(spread, 16);
  return spread;
}

void des_key_parity_adjust(uint8 *key, uint8 len){
  uint8 i, j, parity;

    for (i = 0; i < len; i++){
      parity = 1;
      for (j = 1; j < 8; j++) 
        if ((key[i] >> j) & 0x1) parity = ~parity & 0x01;
      key[i] |= parity;
    }
}

从这里开始Python expand/spread

我的实现：

function deskey_spread(normal){
  spread = new Buffer(16);
  spread[ 0] = normal[ 0] & 0xfe;
  spread[ 1] = ((normal[ 0] << 7) | (normal[ 1] >> 1)) & 0xfe;
  spread[ 2] = ((normal[ 1] << 6) | (normal[ 2] >> 2)) & 0xfe;
  spread[ 3] = ((normal[ 2] << 5) | (normal[ 3] >> 3)) & 0xfe;
  spread[ 4] = ((normal[ 3] << 4) | (normal[ 4] >> 4)) & 0xfe;
  spread[ 5] = ((normal[ 4] << 3) | (normal[ 5] >> 5)) & 0xfe;
  spread[ 6] = ((normal[ 5] << 2) | (normal[ 6] >> 6)) & 0xfe;
  spread[ 7] = normal[ 6] << 1;
  spread[ 8] = normal[ 7] & 0xfe;
  spread[ 9] = ((normal[ 7] << 7) | (normal[ 8] >> 1)) & 0xfe;
  spread[10] = ((normal[ 8] << 6) | (normal[ 9] >> 2)) & 0xfe;
  spread[11] = ((normal[ 9] << 5) | (normal[10] >> 3)) & 0xfe;
  spread[12] = ((normal[10] << 4) | (normal[11] >> 4)) & 0xfe;
  spread[13] = ((normal[11] << 3) | (normal[12] >> 5)) & 0xfe;
  spread[14] = ((normal[12] << 2) | (normal[13] >> 6)) & 0xfe;
  spread[15] = normal[13] << 1;

  des_key_parity_adjust(spread, 16);
  return spread;
}

function des_key_parity_adjust(key, len){
    var i = new Buffer(1);
    var j = new Buffer(1);
    var parity = new Buffer(1);
    for (i = 0; i < len; i++){
      parity = 1;
      for (j = 1; j < 8; j++) 
        if ((key[i] >> j) & 0x1) parity = ~parity & 0x01;
      key[i] |= parity;
    }
}

我的输入：

01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e

使用 C 实现的输出：

01 80 80 61 40 29 19 0E 08 04 45 02 10 91 4C 29

我的 Node.js 实现：

01 80 80 61 40 29 19 0e 08 04 43 40 b0 61 34 1c

怎么了？ :/

Answer 1

代码正确，运行正常。

问题出在输入上，我用的是普通数组，不是Buffer。

使用 Buffer 代码可以正常工作。

输入：

01 80 80 61 40 29 19 0E 08 04 45 02 10 91 4C 29

使用 C 代码：

01 80 80 61 40 29 19 0E 08 04 45 02 10 91 4C 29

使用我的 Node.js 实现

01 80 80 61 40 29 19 0E 08 04 45 02 10 91 4C 29

谢谢！

使用 JavaScript 扩展 DESKey

DESKey expanding using JavaScript

javascript

node.js

encryption

3des

parity