53 lines
1.2 KiB
JavaScript
53 lines
1.2 KiB
JavaScript
var sizes = {
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md5: 16,
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sha1: 20,
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sha224: 28,
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sha256: 32,
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sha384: 48,
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sha512: 64,
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rmd160: 20,
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ripemd160: 20
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}
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var createHmac = require('create-hmac')
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var Buffer = require('safe-buffer').Buffer
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var checkParameters = require('./precondition')
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var defaultEncoding = require('./default-encoding')
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var toBuffer = require('./to-buffer')
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function pbkdf2 (password, salt, iterations, keylen, digest) {
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checkParameters(iterations, keylen)
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password = toBuffer(password, defaultEncoding, 'Password')
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salt = toBuffer(salt, defaultEncoding, 'Salt')
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digest = digest || 'sha1'
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var DK = Buffer.allocUnsafe(keylen)
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var block1 = Buffer.allocUnsafe(salt.length + 4)
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salt.copy(block1, 0, 0, salt.length)
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var destPos = 0
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var hLen = sizes[digest]
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var l = Math.ceil(keylen / hLen)
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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 T = createHmac(digest, password).update(block1).digest()
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var U = T
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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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T.copy(DK, destPos)
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destPos += hLen
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}
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return DK
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}
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module.exports = pbkdf2
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