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javascriptmd5
hyprstack
hyprstack

Reputation: 4229

Javascript md5 hash of different arrays yields same value

Using the md5 npm module, I'm trying to understand why running the following command with two different input values would yield the same hashed value.

const value1 = ["test1"];
const value2 = ["test2"];

const result1 = md5(value1);
const result2 = md5(value2);

// but

const result3 = md5(JSON.stringify(value1));
const result4 = md5(JSON.stringify(value2));

// result1 === result2
// result3 !== result4

Upvotes: 1

Views: 988

Answers (1)

Quentin
Quentin

Reputation: 944474

See the source code:

  md5 = function (message, options) {
    // Convert to byte array
    if (message.constructor == String)
      if (options && options.encoding === 'binary')
        message = bin.stringToBytes(message);
      else
        message = utf8.stringToBytes(message);
    else if (isBuffer(message))
      message = Array.prototype.slice.call(message, 0);
    else if (!Array.isArray(message) && message.constructor !== Uint8Array)
      message = message.toString();
    // else, assume byte array already

If you pass it an array for the message (which you are in your first two cases) then it assumes you are passing it an array of bytes.

You are passing it an array of strings, so it breaks.

Upvotes: 5

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