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52 lines
1.2 KiB
52 lines
1.2 KiB
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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