69 lines
1.3 KiB
JavaScript
69 lines
1.3 KiB
JavaScript
var md5 = require('create-hash/md5')
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module.exports = EVP_BytesToKey
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function EVP_BytesToKey (password, salt, keyLen, ivLen) {
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if (!Buffer.isBuffer(password)) {
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password = new Buffer(password, 'binary')
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}
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if (salt && !Buffer.isBuffer(salt)) {
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salt = new Buffer(salt, 'binary')
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}
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keyLen = keyLen / 8
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ivLen = ivLen || 0
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var ki = 0
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var ii = 0
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var key = new Buffer(keyLen)
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var iv = new Buffer(ivLen)
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var addmd = 0
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var md_buf
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var i
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var bufs = []
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while (true) {
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if (addmd++ > 0) {
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bufs.push(md_buf)
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}
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bufs.push(password)
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if (salt) {
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bufs.push(salt)
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}
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md_buf = md5(Buffer.concat(bufs))
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bufs = []
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i = 0
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if (keyLen > 0) {
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while (true) {
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if (keyLen === 0) {
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break
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}
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if (i === md_buf.length) {
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break
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}
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key[ki++] = md_buf[i]
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keyLen--
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i++
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}
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}
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if (ivLen > 0 && i !== md_buf.length) {
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while (true) {
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if (ivLen === 0) {
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break
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}
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if (i === md_buf.length) {
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break
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}
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iv[ii++] = md_buf[i]
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ivLen--
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i++
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}
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}
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if (keyLen === 0 && ivLen === 0) {
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break
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}
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}
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for (i = 0; i < md_buf.length; i++) {
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md_buf[i] = 0
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}
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return {
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key: key,
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iv: iv
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}
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}
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