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1 /** | |
2 * Test SHA-256 using an ad-hoc iterative technique. | |
3 * This uses a string buffer which has n characters on the nth iteration. | |
4 * Each iteration, the buffer is hashed and the hash is converted to a string. | |
5 * The first two characters of the string are prepended to the buffer, then the | |
6 * last character of the buffer is removed. This way, neither the beginning nor | |
7 * the end of the buffer is fixed. | |
8 * | |
9 * The hashes from each output step are also hashed together into one final hash
. | |
10 * This is compared against a final hash which was computed with SSL. | |
11 */ | |
12 | |
13 new sjcl.test.TestCase("SHA-256 iterative", function (cb) { | |
14 if (!sjcl.hash.sha256) { | |
15 this.unimplemented(); | |
16 cb && cb(); | |
17 return; | |
18 } | |
19 | |
20 var toBeHashed = "", cumulative = new sjcl.hash.sha256(), hash, thiz=this; | |
21 browserUtil.cpsIterate(function (i, cbb) { | |
22 for (var n=100*i; n<100*(i+1); n++) { | |
23 hash = sjcl.hash.sha256.hash(toBeHashed); | |
24 hash = sjcl.codec.hex.fromBits(hash); | |
25 cumulative.update(hash); | |
26 toBeHashed = (hash.substring(0,2)+toBeHashed).substring(0,n+1); | |
27 } | |
28 cbb && cbb(); | |
29 }, 0, 10, true, function () { | |
30 hash = sjcl.codec.hex.fromBits(cumulative.finalize()); | |
31 thiz.require(hash === "f305c76d5d457ddf04f1927166f5e13429407049a5c5f29021916
321fcdcd8b4"); | |
32 cb && cb(); | |
33 }); | |
34 }); | |
35 | |
36 sjcl.test.run(); | |
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