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35 lines
1.3 KiB
JavaScript
35 lines
1.3 KiB
JavaScript
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/**
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* Test SHA-256 using an ad-hoc iterative technique.
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* This uses a string buffer which has n characters on the nth iteration.
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* Each iteration, the buffer is hashed and the hash is converted to a string.
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* The first two characters of the string are prepended to the buffer, then the
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* last character of the buffer is removed. This way, neither the beginning nor
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* the end of the buffer is fixed.
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*
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* The hashes from each output step are also hashed together into one final hash.
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* This is compared against a final hash which was computed with SSL.
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*/
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new sjcl.test.TestCase("SHA-256 iterative", function (cb) {
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if (!sjcl.hash.sha256) {
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this.unimplemented();
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cb && cb();
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return;
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}
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var toBeHashed = "", cumulative = new sjcl.hash.sha256(), hash, thiz=this;
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browserUtil.cpsIterate(function (i, cbb) {
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for (var n=100*i; n<100*(i+1); n++) {
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hash = sjcl.hash.sha256.hash(toBeHashed);
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hash = sjcl.codec.hex.fromBits(hash);
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cumulative.update(hash);
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toBeHashed = (hash.substring(0,2)+toBeHashed).substring(0,n+1);
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}
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cbb && cbb();
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}, 0, 10, true, function () {
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hash = sjcl.codec.hex.fromBits(cumulative.finalize());
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thiz.require(hash === "f305c76d5d457ddf04f1927166f5e13429407049a5c5f29021916321fcdcd8b4");
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cb && cb();
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});
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});
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