Generate the Message Body

Encode the message body (payload) using URL safe Base64 encryption. At a minimum, the body should include these fields:
Message Body Fields
Message Body Field
Description
digest
A base64 encoded SHA-256 has of the claim set.
digestAlgorithm
Algorithm used to sign the JWT.
iat
Time the JWT was issued.
Follow these steps to generate the hash:
  1. Generate the SHA-256 hash of the JSON payload (body of the message).
  2. Encode the hashed string to Base64.
  3. Add the message body hash to the
    digest
     header field.
  4. Add the hash algorithm used to the
    digestAlgorithm
     header field.
Encrypted Message Body
Line break added for readability.
digest: eyJkaWdlc3QiOiJSQk52bzFXelo0b1JScTBXOStoa25wVDdUOElmNTM2REVNQmc5aHlxLzRvPSIsImRpZ
2VzdEFsZ29yaXRobSI6IlNIQS0yNTYiLCJpYXQiOiIyMDI0LTA0LTA1VDE2OjI1OjE4LjI1OVoifQ
Encrypting Message Body Using Python
Generate the SHA-256 hash using the
shasum
 tool. Line break on line three added for readability.
import base64

data = b'{"digest":"RBNvo1WzZ4oRRq0W9+hknpT7T8If536DEMBg9hyq/4o=","digestAlgorithm":"SHA-256",
    "iat":"2024-04-05T16:25:18.259Z"}'
encode = base64.urlsafe_b64encode(data)
stripped = encode.decode('ascii').strip('=')

print(stripped)