javascript - get back a string representation from computeDigest(algorithm, value) byte[] -

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the google app script function computedigest returns byte array of signature. how can string representation of digest?

i have tried bin2string() function.

function sign(){      var signature = utilities.computedigest(utilities.digestalgorithm.md5, "thisisteststring") logger.log(bin2string(signature)); }   function bin2string(array) {   var result = "";   (var = 0; < array.length; i++) {     result += string.fromcharcode(parseint(array[i], 2));   }   return result; }

but puts "" in logs

if put logger.log(signature); right after call computedigest(), get:

[8, 30, -43, 124, -101, 114, -37, 10, 78, -13, -102, 51, 65, -24, -83, 81]

as represented in javascript, digest includes both positive , negative integers, can't treat them ascii characters. md5 algorithm, however, should provide 8-bit values, in range 0x00 0xff (255). negative values, then, misinterpretation of high-order bit; taking sign bit. correct, need add 256 negative value.

how convert decimal hex in javascript? gives retrieving hex characters:

hexstring = yournumber.tostring(16);

putting together, here's sign() function, available gist:

function sign(message){        message = message || "thisisteststring";   var signature = utilities.computedigest(                        utilities.digestalgorithm.md5,                        message,                        utilities.charset.us_ascii);   logger.log(signature);   var signaturestr = '';     (i = 0; < signature.length; i++) {       var byte = signature[i];       if (byte < 0)         byte += 256;       var bytestr = byte.tostring(16);       // ensure have 2 chars in our byte, pad 0       if (bytestr.length == 1) bytestr = '0'+bytestr;       signaturestr += bytestr;     }      logger.log(signaturestr);   return signaturestr; }

and here's logs contain:

[13-04-25 21:46:55:787 edt] [8, 30, -43, 124, -101, 114, -37, 10, 78, -13, -102, 51, 65, -24, -83, 81] [13-04-25 21:46:55:788 edt] 081ed57c9b72db0a4ef39a3341e8ad51

let's see this on-line md5 hash generator:

081ed57c9b72db0a4ef39a3341e8ad51

i tried few other strings, , consistently matched result on-line generator.


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