ecdsa: 1.6.1 moved to relevant section

10 years ago · 4f8c7f4348
1 changed files with 4 additions and 2 deletions
--- a/src/ecdsa.js
+++ b/src/ecdsa.js
@ -177,14 +177,16 @@ function recoverPubKey (curve, e, signature, i) {
  var nR = R.multiply(n)
  assert(curve.isInfinity(nR), 'nR is not a valid curve point')

+  // Compute r^-1
+  var rInv = r.modInverse(n)
+
  // Compute -e from e
  var eNeg = e.negate().mod(n)

  // 1.6.1 Compute Q = r^-1 (sR -  eG)
  //               Q = r^-1 (sR + -eG)
-  var rInv = r.modInverse(n)
-
  var Q = R.multiplyTwo(s, G, eNeg).multiply(rInv)
+
  curve.validate(Q)

  return Q