如何在 JS 中获取 CryptoJS.HmacSHA256 的摘要表示

2022-01-10 00:00:00 python cryptography hmac javascript cryptojs

我必须在摘要中生成 CryptoJS.HmacSHA256 的字符串表示(字节表示).

I have to generate string representation of CryptoJS.HmacSHA256 in digest (bytes representation).

我需要它，因为我必须复制在 javascript 中生成此类摘要的 python 代码:

I need it because i have to duplicate python code which generate such digest in javascript:

print hmac.new("secret", "test", hashlib.sha256).digest()

')�kb��>�y+������:�o��H�   '

目标是在 javascript 中复制上述代码的行为.

The goal is to duplicate behaviour of code above in javascript.

你能建议我怎么做吗?

推荐答案

如果您需要原始字节，那么 CryptoJS 似乎没有为它提供代码.提到这是因为Uint8Array和朋友缺乏跨浏览器兼容性.

If you need raw bytes then CryptoJS does not seem to supply code for it. It is mentioned that this is because of lack of cross browser compatibility for Uint8Array and friends.

但是，经过搜索，我确实找到了一些由 Vincenzo Ciancia 创建的转换代码:

However, after searching, I did find some conversion code created by Vincenzo Ciancia:

CryptoJS.enc.u8array = {
    /**
     * Converts a word array to a Uint8Array.
     *
     * @param {WordArray} wordArray The word array.
     *
     * @return {Uint8Array} The Uint8Array.
     *
     * @static
     *
     * @example
     *
     *     var u8arr = CryptoJS.enc.u8array.stringify(wordArray);
     */
    stringify: function (wordArray) {
        // Shortcuts
        var words = wordArray.words;
        var sigBytes = wordArray.sigBytes;

        // Convert
        var u8 = new Uint8Array(sigBytes);
        for (var i = 0; i < sigBytes; i++) {
            var byte = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
            u8[i]=byte;
        }

        return u8;
    },

    /**
     * Converts a Uint8Array to a word array.
     *
     * @param {string} u8Str The Uint8Array.
     *
     * @return {WordArray} The word array.
     *
     * @static
     *
     * @example
     *
     *     var wordArray = CryptoJS.enc.u8array.parse(u8arr);
     */
    parse: function (u8arr) {
        // Shortcut
        var len = u8arr.length;

        // Convert
        var words = [];
        for (var i = 0; i < len; i++) {
            words[i >>> 2] |= (u8arr[i] & 0xff) << (24 - (i % 4) * 8);
        }

        return CryptoJS.lib.WordArray.create(words, len);
    }
};

当然请注意，字节不会直接转换为字符；你不能使用文本比较来比较 ') kb > y+ : oΚ H ' 由 python 生成.为此，您确实需要一个编码器，例如十六进制或 base 64.在这种情况下，请查看 来自Artjom 代替.

Note of course that bytes don't translate directly to characters; you cannot use a text compare to compare against ')�kb��>�y+������:�o��H� ' generated by python. For that you do need an encoder such as hexadecimals or base 64. In that case please look at the answer from Artjom instead.

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