Update vss lib for share hash

packages/vss/lib/index.js

@@ -158,6 +158,22 @@ exports.verifyShare = function (bls, share, vvec) {
   return Boolean(isEqual)
 }
 
+/**
+ * calculates a hash against a share 
+ * @param {Object} bls - an instance of [bls-wasm](https://github.com/herumi/bls-wasm)
+ * @param {Object} share - a share to be verified
+ * @return {String}
+ */
+exports.hashShare = function (bls, share) {
+  const sk = new bls.SecretKey()
+  sk.deserialize(share.sk)
+
+  const sHash = new bls.Fr()
+  sHash.setHashOf(sk.serializeToHexStr())
+
+  return sHash.serializeToHexStr()
+}
+
 /**
  * recovers the secret from a selection of shares
  * @param {Object} bls - an instance of [bls-wasm](https://github.com/herumi/bls-wasm)

packages/vss/test/vss.js

@@ -18,6 +18,9 @@ const curveTest = (curveType, name) => {
       setup.shares.forEach(share => {
         const verified = vss.verifyShare(bls, share, result.verificationVector)
         assert.strict.deepEqual(verified, true, 'should verify share')
+
+        const shareHash = vss.hashShare(bls, share)
+        console.log('shareHash:', shareHash)
       })
 
       var reSecret = vss.recoverSecret(bls, setup.shares.slice(0, threshold))
@@ -36,7 +39,7 @@ const curveTest = (curveType, name) => {
       reSecret = vss.recoverSecret(bls, renewal.shares.slice(0, threshold))
       const sec2 = new bls.SecretKey()
       sec2.deserialize(reSecret)
-      console.log('recovered:', sec2.serializeToHexStr())
+      console.log('renew-recovered:', sec2.serializeToHexStr())
       assert.strict.deepEqual(reSecret, result.secret, 'secret should not change after share renewal')
     } catch (e) {
       console.log(`TEST FAIL ${e}`)