Skip to main content

A Python implementation of Sign-In with Ethereum (EIP-4361).

Project description

Sign-In with Ethereum

This package provides a Python implementation of EIP-4631: Sign In With Ethereum.

Installation

SIWE can be easily installed in any Python project with pip:

pip install siwe

Usage

SIWE provides a SiweMessage class which implements EIP-4361.

Parsing a SIWE Message

Parsing is done by initializing a SiweMessage object with an EIP-4361 formatted string:

message: SiweMessage = SiweMessage(message=eip_4361_string)

Alternatively, initialization of a SiweMessage object can be done with a dictionary containing expected attributes:

message: SiweMessage = SiweMessage(message={"domain": "login.xyz", "address": "0x1234...", ...})

Verifying and Authenticating a SIWE Message

Verification and authentication is performed via EIP-191, using the address field of the SiweMessage as the expected signer. The validate method checks message structural integrity, signature address validity, and time-based validity attributes.

try:
    message.validate()
except siwe.ValidationError:
    # Invalid

Serialization of a SIWE Message

SiweMessage instances can also be serialized as their EIP-4361 string representations via the sign_message method:

print(message.sign_message())

Example

Parsing and verifying a SiweMessage is easy:

try:
    message: SiweMessage = SiweMessage(message=eip_4361_string)
    message.validate():
except siwe.ValueError:
    # Invalid message
    print("Authentication attempt rejected.")
except siwe.ExpiredMessage:
    print("Authentication attempt rejected.")
except siwe.MalformedSession as e:
    # e.missing_fields contains the missing information needed for validation
    print("Authentication attempt rejected.")
except siwe.InvalidSignature:
    print("Authentication attempt rejected.")
    
# Message has been validated. Authentication complete. Continue with authorization/other.

TODOs

  • Support for contract wallets.

See Also

Disclaimer

Our Python library for Sign-In with Ethereum has not yet undergone a formal security audit. We welcome continued feedback on the usability, architecture, and security of this implementation.

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

siwe-1.0.1.tar.gz (12.5 kB view hashes)

Uploaded Source

Built Distribution

siwe-1.0.1-py3-none-any.whl (8.3 kB view hashes)

Uploaded Python 3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page