verify.js

'use strict'
// much of this based on https://github.com/indutny/self-signed/blob/gh-pages/lib/rsa.js
var parseKeys = require('parse-asn1')
var elliptic = require('elliptic')
var curves = require('./curves')
var BN = require('bn.js')
module.exports = verify

function verify (sig, hash, key, signType) {
  var pub = parseKeys(key)
  if (pub.type === 'ec') {
    if (signType !== 'ecdsa') {
      throw new Error('wrong public key type')
    }
    return ecVerify(sig, hash, pub)
  } else if (pub.type === 'dsa') {
    if (signType !== 'dsa') {
      throw new Error('wrong public key type')
    }
    return dsaVerify(sig, hash, pub)
  } else {
    if (signType !== 'rsa') {
      throw new Error('wrong public key type')
    }
  }
  var len = pub.modulus.byteLength()
  var pad = [ 1 ]
  var padNum = 0
  while (hash.length + pad.length + 2 < len) {
    pad.push(0xff)
    padNum++
  }
  pad.push(0x00)
  var i = -1
  while (++i < hash.length) {
    pad.push(hash[i])
  }
  pad = new Buffer(pad)
  var red = BN.mont(pub.modulus)
  sig = new BN(sig).toRed(red)

  sig = sig.redPow(new BN(pub.publicExponent))

  sig = new Buffer(sig.fromRed().toArray())
  var out = 0
  if (padNum < 8) {
    out = 1
  }
  len = Math.min(sig.length, pad.length)
  if (sig.length !== pad.length) {
    out = 1
  }

  i = -1
  while (++i < len) {
    out |= (sig[i] ^ pad[i])
  }
  return out === 0
}
function ecVerify (sig, hash, pub) {
  var curveId = curves[pub.data.algorithm.curve.join('.')]
  if (!curveId)
    throw new Error('unknown curve ' + pub.data.algorithm.curve.join('.'))

  var curve = new elliptic.ec(curveId)

  var pubkey = pub.data.subjectPrivateKey.data
  return curve.verify(hash, sig, pubkey)
}
function dsaVerify (sig, hash, pub) {
  var p = pub.data.p
  var q = pub.data.q
  var g = pub.data.g
  var y = pub.data.pub_key
  var unpacked = parseKeys.signature.decode(sig, 'der')
  var s = unpacked.s
  var r = unpacked.r
  checkValue(s, q)
  checkValue(r, q)
  var montq = BN.mont(q)
  var montp = BN.mont(p)
  var w =  s.invm(q)
  var v = g.toRed(montp)
  .redPow(new BN(hash).mul(w).mod(q))
  .fromRed()
  .mul(
    y.toRed(montp)
    .redPow(r.mul(w).mod(q))
    .fromRed()
  ).mod(p).mod(q)
  return !v.cmp(r)
}
function checkValue (b, q) {
  if (b.cmpn(0) <= 0) {
    throw new Error('invalid sig')
  }
  if (b.cmp(q) >= q) {
    throw new Error('invalid sig')
  }
}