在JS中使用字节数组创建HMAC SHA-1

Question

我创建了以下实用函数，它应该使用

crypto-js

在 TypeScript 中创建 HMAC SHA-1 哈希：

import hmacSha1 from 'crypto-js/hmac-sha1'

export function hotp(
  hmac: Uint8Array,
  message: string
): { key: string; message: string; sha1: string } {
  const key = new TextDecoder('utf-8').decode(hmac)
  const sha1 = hmacSha1(message, key)

  return { key, message, sha1: sha1.toString() }
}

我得到了一些字节数组，其中包含用于对消息进行编码的密钥。这些来自 Python 脚本。我的目标是让输出与 Python 代码匹配。

当我使用这个键（我相信它只包含标准字符）时，我可以获得匹配的输出：

const key = new Uint8Array([
  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
  0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b,
  0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,
  0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
  0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
])

const message = 'Sample #1'

// output: 4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a

但是，当我使用具有特殊字符的键时，我无法使输出匹配：

const key = new Uint8Array([
  0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d,
  0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b,
  0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
  0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
  0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,
  0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3,
  0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1,
  0xb2, 0xb3,
])

const message = 'Sample #3'

// expected: bcf41eab8bb2d802f3d05caf7cb092ecf8d1a3aa
// actual: 2b3a896d497370f248bb9416b2262b9016c6b34b

我猜我错误地解码了特殊字符，但我不知道哪里出了问题。我认为这是因为如果我对第二个示例中的密钥进行 JSON 编码，我会看到以下内容：

"PQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~����������������������������������������������������"

我应该在控制台中看到那些

�

吗？我需要做什么才能正确解码字节？

Answer 1

Uint8Array

key

通常包含不符合 UTF-8 标准的字节序列，因此在使用

TextDecoder()

进行 UTF-8 解码期间，数据会被不可逆地损坏。修复：将

Uint8Array

转换为

WordArray

:

function hotp(hmac, message) {
  const key = CryptoJS.lib.WordArray.create(hmac) // new TextDecoder('utf-8').decode(hmac)
  const sha1 = CryptoJS.HmacSHA1(message, key)

  return { key, message, sha1: sha1.toString() }
}

const key1 = new Uint8Array([
  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
  0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b,
  0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,
  0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
  0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
])
console.log(hotp(key1, 'Sample #1').sha1) // 4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a

const key2 = new Uint8Array([
  0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d,
  0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b,
  0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
  0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
  0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,
  0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3,
  0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1,
  0xb2, 0xb3,
])
console.log(hotp(key2, 'Sample #3').sha1) // bcf41eab8bb2d802f3d05caf7cb092ecf8d1a3aa

<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.2.0/crypto-js.min.js"></script>

通过这个改变，就产生了预期的结果。