Forked from artjomb/CryptoJS_byteArrayWordArrayConversions.js
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May 9, 2017 07:50
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Convert a byte array to a word array and back in CryptoJS-compatible fashion
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| /** | |
| * EXAMPLE | |
| * var myhash = CryptoJS.HmacSHA1(mine[2], secret); | |
| * myhash = byteArrayConversion(myhash); | |
| */ | |
| function wordArrayToByteArray(hash){ | |
| return hash.words | |
| //map each word to an array of bytes | |
| .map(function(v){ | |
| // create an array of 4 bytes (less if sigBytes says we have run out) | |
| var bytes = [0,0,0,0].slice(0,Math.min(4,hash.sigBytes)) | |
| // grab that section of the 4 byte word | |
| .map(function(d,i){ return (v >>> (8*i)) % 256; }) | |
| // flip that | |
| .reverse() | |
| ; | |
| // remove the bytes we've processed | |
| // from the bytes we need to process | |
| hash.sigBytes -= bytes.length; | |
| return bytes; | |
| }) | |
| // concatinate all the arrays of bytes | |
| .reduce(function(a,d){ return a.concat(d);},[]) | |
| // convert the 'bytes' to 'characters' | |
| .map(function(d){return String.fromCharCode(d);}) | |
| // create a single block of memory | |
| .join('') | |
| ; | |
| } |
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