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Sign JSON with Ed25519 signatures

Project description

Latest Version

Signs JSON objects with ED25519 signatures.


  • 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.


pip install signedjson


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)

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


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

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