69 lines
1.3 KiB
JavaScript
69 lines
1.3 KiB
JavaScript
|
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
|
||
|
|
}
|
||
|
|
}
|