SHA1 JavaScript Implementation for large string
I have the same problem as :Can SHA-1 algorithm be computed on a stream? With low memory footprint?
I'm looking for a JavaScript implementation which computed block by block of a very large string. The idea is to slice the string into 512 bits block and do it block by block.
Any hint?
[updated] Thanks sunetos's help, I write a litte html5 java script app: Generate SHA1 File Checksum Using HTML5 File API in Javascript
I believe I came across one by Paul Johnston at http://pajhome.org.uk/crypt/md5/contrib/sha1_stream.js . It is listed on the page http://pajhome.org.uk/crypt/md5/scripts.html . I have not tested it myself, but I have used his non-streamable version that he modified for it.
UPDATE: Here is some example code (I verified it against a separate SHA1 known to be correct). Make sure you include the original sha1.js (found at http://pajhome.org.uk/crypt/md5/sha1.js) before the streamable sha1_stream.js.
<script src="sha1.js" type="text/javascript" charset="utf-8"></script>
<script src="sha1_stream.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript" charset="utf-8">
var input = 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz';
var blocksize = 512;
var h = naked_sha1_head();
for (var i = 0; i < input.length; i += blocksize) {
var len = Math.min(blocksize, input.length - i);
var block = input.substr(i, len);
naked_sha1(str2binb(block), len*chrsz, h);
}
var result = binb2hex(naked_sha1_tail(h));
</script>
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