Merge branch 'Stellar-seed-decryption-service' into 'master'

Stellar seed decryption completed for patient EHR

See merge request !15

ExpressBackend/route/patient-routes/nft-route.js

 const express = require("express");
 const router = express.Router();
 const DecryptWithServerKey = require("./../../services/decryptionservice");
+const DecryptWithStellarSeed = require("./../../services/seedDecryptionService");
 const Patient = require("./../../model/patient/patient");
 const axios = require("axios");
 const StellarSDK = require("stellar-sdk");
@@ -116,14 +117,13 @@ router.post("/", async (req, res) => {
                 genesisJsonOb[i]._attributes.body._value._attributes.dataValue
                   .data
               );
-
               //append genesis details to the HTML string
               htmlString =
                 htmlString +
                 `<p>` +
                 name.toString() +
                 ` : ` +
-                value.toString() +
+                DecryptWithStellarSeed(value.toString(), decryptedPatientSeed) +
                 `</p>`;
             }
           }
@@ -221,7 +221,10 @@ router.post("/", async (req, res) => {
                     `<p>` +
                     name.toString() +
                     ` : ` +
-                    value.toString() +
+                    DecryptWithStellarSeed(
+                      value.toString(),
+                      decryptedPatientSeed
+                    ) +
                     `</p>`;
                 }
               }

ExpressBackend/services/seedDecryptionService.js

+const cryptojs = require("crypto-js");
+
+function DecryptWithStellarSeed(encryptedText, seed) {
+  var key = cryptojs.enc.Utf8.parse(seed);
+  var options = {
+    mode: cryptojs.mode.CBC,
+    padding: cryptojs.pad.Pkcs7,
+    iv: cryptojs.enc.Utf8.parse(seed),
+  };
+  var decrypted = cryptojs.AES.decrypt(encryptedText, key, options).toString(
+    cryptojs.enc.Utf8
+  );
+
+  return decrypted;
+}
+
+module.exports = DecryptWithStellarSeed;