first

libs/crypto.js

@@ -0,0 +1,83 @@
+var crypto = require('crypto')
+
+/**
+ * @param  {Number} len
+ */
+var random = (len = 32) => {
+  var buf = crypto.randomBytes(len)
+  return buf.toString('hex')
+}
+
+/**
+ *
+ * @param {string} str
+ */
+var sha256 = (str, tostr = 'base64') => {
+  return crypto.createHash('sha256').update(str).digest(tostr)
+}
+
+/**
+ *
+ * @param {string} str
+ */
+var genPassHash = (str) => {
+  var hash = random(16)
+  var pass = sha256(str + hash)
+  return `$${hash}$${pass}`
+}
+
+/**
+ *
+ * @param {string} plain
+ * @param {string} hash
+ */
+var comparePass = (plain, hash) => {
+  var match = hash.match(/^\$(.+?)\$(.+)$/)
+  if (match == null || match.length < 3 || !match[1] || !match[2]) return false
+  var pass = sha256(plain + match[1])
+  if (pass === match[2]) return true
+  return false
+}
+
+const pbkdf2 = (pass, salt, count, len, tostr = false) => {
+  let hlen = crypto.createHash('sha256').update('').digest().length
+  let blockCount = Math.ceil(len / hlen)
+
+  let s256 = (s) => { return crypto.createHash('sha256').update(s).digest() }
+
+  let out = []
+  for (let i = 0; i < blockCount; i++) {
+    let loopBuf = Buffer.alloc(4)
+    loopBuf.writeInt32BE(i)
+    let saltBuf = Buffer.from(salt)
+    let last = Buffer.concat([saltBuf, loopBuf], saltBuf.length + loopBuf.length)
+    let passBuf = Buffer.from(pass)
+    last = s256(Buffer.concat([passBuf, last], passBuf.length + last.length))
+    let xor = Buffer.from(last)
+    for (let j = 1; j < count; j++) {
+      last = s256(Buffer.concat([passBuf, last], passBuf.length + last.length))
+      xor = last.map((t, idx) => {
+        return t ^ xor[idx]
+      })
+    }
+    out.push(xor)
+  }
+  let olen = 0
+  for (let i in out) {
+    olen += out[i].length
+  }
+  let raw = Buffer.concat([...out], olen)
+  if (!tostr) {
+    return raw.slice(0, len)
+  } else {
+    return Buffer.from(raw.slice(0, len)).toString('hex')
+  }
+}
+
+module.exports = {
+  random,
+  sha256,
+  genPassHash,
+  comparePass,
+  pbkdf2
+}