We have installed the code base and testing in our environemnt.
(1) Encryption is working fine,
(2) When we are decrypting we are getting the following error.

Installed verisons
(1) node-v8.9.2-linux-x64
(2) postgresql-10.1-1-linux-x64

Server Console Message:

(node:7319) DeprecationWarning: Using the automatically created return value from client.query as an event emitter is deprecated and will be removed in [email protected]. Please see the upgrade guide at https://node-postgres.com/guides/upgrading
Executed (default): SELECT "id", "public", "private", "type", "active", "createdAt", "updatedAt" FROM "Keys" AS "Keys"; Elapsed time: 27ms
KeyService listening on port 8013 in development mode
POST /decrypt 500 84.788 ms - 1645
TypeError: Cannot read property 'private' of undefined
at decryptValue (/opt/enc-service-master/app.js:94:57)
at app.post (/opt/enc-service-master/app.js:55:21)
at Layer.handle [as handle_request] (/opt/enc-service-master/node_modules/express/lib/router/layer.js:95:5)
at next (/opt/enc-service-master/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/opt/enc-service-master/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/opt/enc-service-master/node_modules/express/lib/router/layer.js:95:5)
at /opt/enc-service-master/node_modules/express/lib/router/index.js:281:22
at Function.process_params (/opt/enc-service-master/node_modules/express/lib/router/index.js:335:12)
at next (/opt/enc-service-master/node_modules/express/lib/router/index.js:275:10)
at /opt/enc-service-master/node_modules/body-parser/lib/read.js:130:5
at invokeCallback (/opt/enc-service-master/node_modules/raw-body/index.js:262:16)
at done (/opt/enc-service-master/node_modules/raw-body/index.js:251:7)
at IncomingMessage.onEnd (/opt/enc-service-master/node_modules/raw-body/index.js:307:7)
at emitNone (events.js:106:13)
at IncomingMessage.emit (events.js:208:7)
at endReadableNT (_stream_readable.js:1056:12)
POST /encrypt 200 15.806 ms - 99

Build fails with below error:

#8 73.66 npm ERR! Linux 5.4.0-1104-azure
#8 73.66 npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "i"
#8 73.66 npm ERR! node v6.14.4
#8 73.66 npm ERR! npm v3.10.10
#8 73.66 npm ERR! path /home/enc/node_modules/.staging/@types/node-54e63457/package.json
#8 73.66 npm ERR! code ENOTDIR
#8 73.66 npm ERR! errno -20
#8 73.66 npm ERR! syscall open
#8 73.66
#8 73.66 npm ERR! ENOTDIR: not a directory, open '/home/enc/node_modules/.staging/@types/node-54e63457/package.json'
#8 73.66 npm ERR!
#8 73.66 npm ERR! If you need help, you may report this error at:
#8 73.66 npm ERR! https://github.com/npm/npm/issues
#8 73.72
#8 73.72 npm ERR! Please include the following file with any support request:
#8 73.72 npm ERR! /home/enc/npm-debug.log