69 lines
1.7 KiB
JavaScript
69 lines
1.7 KiB
JavaScript
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var createHmac = require('create-hmac')
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var checkParameters = require('./precondition')
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exports.pbkdf2 = function (password, salt, iterations, keylen, digest, callback) {
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if (typeof digest === 'function') {
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callback = digest
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digest = undefined
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}
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checkParameters(iterations, keylen)
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if (typeof callback !== 'function') throw new Error('No callback provided to pbkdf2')
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setTimeout(function () {
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callback(null, exports.pbkdf2Sync(password, salt, iterations, keylen, digest))
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})
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}
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var defaultEncoding
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if (process.browser) {
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defaultEncoding = 'utf-8'
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} else {
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var pVersionMajor = parseInt(process.version.split('.')[0].slice(1), 10)
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defaultEncoding = pVersionMajor >= 6 ? 'utf-8' : 'binary'
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}
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exports.pbkdf2Sync = function (password, salt, iterations, keylen, digest) {
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if (!Buffer.isBuffer(password)) password = new Buffer(password, defaultEncoding)
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if (!Buffer.isBuffer(salt)) salt = new Buffer(salt, defaultEncoding)
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checkParameters(iterations, keylen)
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digest = digest || 'sha1'
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var hLen
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var l = 1
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var DK = new Buffer(keylen)
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var block1 = new Buffer(salt.length + 4)
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salt.copy(block1, 0, 0, salt.length)
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var r
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var T
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for (var i = 1; i <= l; i++) {
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block1.writeUInt32BE(i, salt.length)
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var U = createHmac(digest, password).update(block1).digest()
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if (!hLen) {
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hLen = U.length
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T = new Buffer(hLen)
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l = Math.ceil(keylen / hLen)
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r = keylen - (l - 1) * hLen
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}
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U.copy(T, 0, 0, hLen)
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for (var j = 1; j < iterations; j++) {
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U = createHmac(digest, password).update(U).digest()
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for (var k = 0; k < hLen; k++) T[k] ^= U[k]
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}
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var destPos = (i - 1) * hLen
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var len = (i === l ? r : hLen)
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T.copy(DK, destPos, 0, len)
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}
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return DK
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}
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