This is an AWS Lambda NodeJS project that verifies Saltpack messages, returning the verified message and the user it was signed by, or an error if there was one.
Example webpage calling this lambda
Follow the instructions in the README.md file inside of the keybase directory to get started.
Once you have the proper files/directories created and in place, deployment is as simple as zipping all the files/directories in this repo, and uploading to an AWS Lambda endpoint.
I recommend extending the memory of the Lambda to at least 384 MB, preferably 512 MB, as well as extending the timeout to around a minute. The Keybase executable can eat up some RAM and take longer on bigger messages, especially after a cold start.
Once you have the Lambda endpoint setup, simply POST to it using Content-Type of application/json, and a body of the message you're trying to verify.
Example
POST https://abcd1234.execute-api.us-west-2.amazonaws.com/default/saltpackVerifyLambda HTTP/1.1
Content-Type: application/json
BEGIN KEYBASE SALTPACK SIGNED MESSAGE. kXR7VktZdyH7rvq v5weRa0zkFyr6YL d3W8OHdrkfXresG pb2HM2IGZNEwDU1 TcXTRZKvzcTgcJi PSIn2v0Fqlnl0Nv kCCWYtpVTaoFtip H5DjK1EgAXRIJXe SBu9GkFsbSQYELa MF2tPIAhEjU0vMT 9MoG1N7VUhNOCVk sDn82EPYlZqTa6c 4cQv9maKt5wdAnM sDWE5fOA. END KEYBASE SALTPACK SIGNED MESSAGE.