tsp-client 0.1.0

An IETF Time-Stamp Protocol (TSP) (RFC 3161) client

tsp-client is an implementation of the RFC 3161 TSP protocol in Python.

Installation

pip install tsp-client

Synopsis

from tsp_client import TSPSigner, TSPVerifier

# Sign a message online by transmitting its digest to the timestamp authority
message = b"abc"
signer = TSPSigner()
signed = signer.sign(message)  # Returns raw bytes of the verified timestamp token.

# Verify a presented timestamp token offline using the original message
verified = TSPVerifier().verify(signed, message=message)

# Or verify using the message digest (digest algorithm may vary)
import hashlib

digest = hashlib.sha512(message).digest()
verified = TSPVerifier().verify(signed, message_digest=digest)

print(verified.tst_info)  # Parsed TSTInfo (CMS SignedData) structure
print(verified.signed_attrs)  # Parsed CMS SignedAttributes structure

Specifying a custom TSA

By default, tsp-client uses the DigiCert TSA server. To use a different TSA, set the SigningSettings.tsp_server attribute as follows:

from tsp_client import TSPSigner, TSPVerifier, SigningSettings
signing_settings = SigningSettings(tsp_server="http://tsa.quovadisglobal.com/TSS/HttpTspServer")
signer = TSPSigner()
signed = signer.sign(message, signing_settings=signing_settings)

Authors

• Andrey Kislyuk

Links

• Project home page (GitHub)

• Documentation

• Package distribution (PyPI)

• Change log

• IETF RFC 3161: Time-Stamp Protocol (TSP)

Bugs

Please report bugs, issues, feature requests, etc. on GitHub.

License

Licensed under the terms of the Apache License, Version 2.0.