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42 lines
1.3 KiB
42 lines
1.3 KiB
11 years ago
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// Crypto extensions
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//
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// PBKDF2 with SHA512 - browser version
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var jssha = require('jssha')
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var pbkdf2_sha512 = function (password, salt, keylen, options) {
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password = new Buffer(password);
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salt = new Buffer(salt);
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// Defaults
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var iterations = options && options.iterations || 1;
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// Pseudo-random function
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function PRF(password, salt) {
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var j = new jssha(salt.toString('hex'), 'HEX');
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var hash = j.getHMAC(password.toString('hex'), "HEX", "SHA-512", "HEX");
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return new Buffer(hash, 'hex');
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}
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// Generate key
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var derivedKeyBytes = new Buffer([]),
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blockindex = 1;
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while (derivedKeyBytes.length < keylen) {
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var block = PRF(password, salt.concat([0, 0, 0, blockindex]));
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for (var u = block, i = 1; i < iterations; i++) {
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u = PRF(password, u);
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for (var j = 0; j < block.length; j++) block[j] ^= u[j];
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}
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derivedKeyBytes = derivedKeyBytes.concat(block);
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blockindex++;
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}
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// Truncate excess bytes - TODO
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//derivedKeyBytes.length = keylen;
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return new Buffer(derivedKeyBytes);
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};
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exports.pbkdf2Sync_sha512 = function(password, salt, iterations, keylen) {
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return pbkdf2_sha512(password, salt, keylen, {iterations: iterations});
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};
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