54 lines
1.3 KiB
JavaScript
54 lines
1.3 KiB
JavaScript
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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 checkParameters = require('../lib/precondition')
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var defaultEncoding = require('../lib/default-encoding')
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var Buffer = require('safe-buffer').Buffer
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module.exports = pbkdf2
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function pbkdf2 (password, salt, iterations, keylen, digest) {
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if (!Buffer.isBuffer(password)) password = Buffer.from(password, defaultEncoding)
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if (!Buffer.isBuffer(salt)) salt = Buffer.from(salt, defaultEncoding)
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checkParameters(iterations, keylen)
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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 U, j, destPos, len
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var hLen = sizes[digest]
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var T = Buffer.allocUnsafe(hLen)
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var l = Math.ceil(keylen / hLen)
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var r = keylen - (l - 1) * 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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U = createHmac(digest, password).update(block1).digest()
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U.copy(T, 0, 0, hLen)
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for (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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destPos = (i - 1) * hLen
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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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