如何获取CryptoJS.HmacSHA256在JS中的摘要表示 [英] How to get digest representation of CryptoJS.HmacSHA256 in JS

问题描述

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

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

因为我必须复制python代码，在javascript中生成这样的摘要：

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中重复上述代码的行为。

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

请告诉我如何做这个？

推荐答案

如果你需要原始字节，CryptoJS似乎不提供代码。提到这是因为缺少对 Uint8Array 和朋友的跨浏览器兼容性。

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.

然而， ，我找到了一些由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);
    }
};

注意当然，字节不直接转换为字符; 您不能使用文本比较与'进行比较） kb > y+ ： oΚ H '由python生成。为了你 需要一个编码器，如十六进制或基数64。

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.

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