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