GitHub - matrix-org/python-signedjson: Sign JSON objects with ED25519 signatures

Signed JSON

Signs JSON objects with ED25519 signatures.

Features

More than one entity can sign the same object.
Each entity can sign the object with more than one key making it easier to rotate keys
ED25519 can be replaced with a different algorithm.
Unprotected data can be added to the object under the "unsigned" key.

Installing

Using

from signedjson.key import generate_signing_key, get_verify_key
from signedjson.sign import (
    sign_json, verify_signed_json, SignatureVerifyException
)

signing_key = generate_signing_key('zxcvb')
signed_json = sign_json({'my_key': 'my_data'}, 'Alice', signing_key)

verify_key = get_verify_key(signing_key)

try:
    verify_signed_json(signed_json, 'Alice', verify_key)
    print 'Signature is valid'
except SignatureVerifyException:
    print 'Signature is invalid'

Format

{
    "<protected_name>": "<protected_value>",
    "signatures": {
        "<entity_name>": {
            "ed25519:<key_id>": "<unpadded_base64_signature>"
        }
    },
    "unsigned": {
        "<unprotected_name>": "<unprotected_value>",
    }
}