You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
1.2 KiB
45 lines
1.2 KiB
var Buffer = require('safe-buffer').Buffer
|
|
var MD5 = require('md5.js')
|
|
|
|
/* eslint-disable camelcase */
|
|
function EVP_BytesToKey (password, salt, keyBits, ivLen) {
|
|
if (!Buffer.isBuffer(password)) password = Buffer.from(password, 'binary')
|
|
if (salt) {
|
|
if (!Buffer.isBuffer(salt)) salt = Buffer.from(salt, 'binary')
|
|
if (salt.length !== 8) throw new RangeError('salt should be Buffer with 8 byte length')
|
|
}
|
|
|
|
var keyLen = keyBits / 8
|
|
var key = Buffer.alloc(keyLen)
|
|
var iv = Buffer.alloc(ivLen || 0)
|
|
var tmp = Buffer.alloc(0)
|
|
|
|
while (keyLen > 0 || ivLen > 0) {
|
|
var hash = new MD5()
|
|
hash.update(tmp)
|
|
hash.update(password)
|
|
if (salt) hash.update(salt)
|
|
tmp = hash.digest()
|
|
|
|
var used = 0
|
|
|
|
if (keyLen > 0) {
|
|
var keyStart = key.length - keyLen
|
|
used = Math.min(keyLen, tmp.length)
|
|
tmp.copy(key, keyStart, 0, used)
|
|
keyLen -= used
|
|
}
|
|
|
|
if (used < tmp.length && ivLen > 0) {
|
|
var ivStart = iv.length - ivLen
|
|
var length = Math.min(ivLen, tmp.length - used)
|
|
tmp.copy(iv, ivStart, used, used + length)
|
|
ivLen -= length
|
|
}
|
|
}
|
|
|
|
tmp.fill(0)
|
|
return { key: key, iv: iv }
|
|
}
|
|
|
|
module.exports = EVP_BytesToKey
|
|
|