Cross-platform Python CFFI bindings for libsecp256k1

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  • License: MIT License (MIT)
  • Author: Ofek Lev
  • Tags secp256k1, elliptic curves, bitcoin, ethereum, cryptocurrency
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Project description

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This library provides well-tested Python CFFI bindings for libsecp256k1, the heavily optimized C library used by Bitcoin Core for operations on elliptic curve secp256k1.

Coincurve replaces secp256k1-py.

New features include:

  • Cleaner API

  • Uses newest version of libsecp256k1

  • Support for Windows

  • Linux, macOS, and Windows all have binary packages for both 64 and 32-bit architectures

  • Linux & macOS use GMP for faster computation

  • Endomorphism optimization is enabled

  • A global context is used by default, drastically increasing performance

  • Fixed ECDH

  • A fix to remove CFFI warnings

  • Implements a fix for https://bugs.python.org/issue28150 to support Python 3.6+ on macOS

Installation

Coincurve is distributed on PyPI and is available on Linux/macOS and Windows and supports Python 2.7/3.5+ and PyPy2.7-v5.7.1/PyPy3.5-v5.7.1+.

$ pip install coincurve

API

Coincurve provides a simple API.

coincurve.verify_signature

verify_signature(signature, message, public_key, hasher=sha256, context=GLOBAL_CONTEXT)

Verifies some message was signed by the owner of a public key.

  • Parameters:

    • signature (bytes) - The signature to verify.

    • message (bytes) - The message that was supposedly signed.

    • public_key (bytes) - A public key in compressed or uncompressed form.

    • hasher - The hash function to use. hasher(message) must return 32 bytes.

    • context (coincurve.Context)

  • Returns: bool

coincurve.PrivateKey

All instances have a public_key of type coincurve.PublicKey

PrivateKey(secret=None, context=GLOBAL_CONTEXT)

  • Parameters:

    • secret (bytes) - The secret to use.

    • context (coincurve.Context)

Methods

classmethod from_hex(hexed, context=GLOBAL_CONTEXT)

classmethod from_int(num, context=GLOBAL_CONTEXT)

classmethod from_pem(pem, context=GLOBAL_CONTEXT)

classmethod from_der(der, context=GLOBAL_CONTEXT)

sign(message, hasher=sha256)

  • Parameters:

    • message (bytes) - The message to sign.

    • hasher - The hash function to use. hasher(message) must return 32 bytes.

  • Returns: bytes. 71 <= len(signature) <= 72

sign_recoverable(message, hasher=sha256)

  • Parameters:

    • message (bytes) - The message to sign.

    • hasher - The hash function to use. hasher(message) must return 32 bytes.

  • Returns: bytes

ecdh(public_key)

Computes a Diffie-Hellman secret in constant time.

  • Parameters:

    • public_key (bytes) - Another party’s public key in compressed or uncompressed form.

  • Returns: bytes

add(scalar, update=False)

  • Parameters:

    • scalar (bytes) - The scalar to add.

    • update - If True, will update and return self.

  • Returns: coincurve.PrivateKey

multiply(scalar, update=False)

  • Parameters:

    • scalar (bytes) - The scalar to multiply.

    • update - If True, will update and return self.

  • Returns: coincurve.PrivateKey

to_hex()

to_int()

to_pem()

to_der()

coincurve.PublicKey

PublicKey(data, context=GLOBAL_CONTEXT)

  • Parameters:

    • data (bytes) - The public key in compressed or uncompressed form.

    • context (coincurve.Context)

Methods

classmethod from_secret(secret, context=GLOBAL_CONTEXT)

classmethod from_valid_secret(secret, context=GLOBAL_CONTEXT)

classmethod from_point(x, y, context=GLOBAL_CONTEXT)

classmethod from_signature_and_message(serialized_sig, message, hasher=sha256, context=GLOBAL_CONTEXT)

format(compressed=True)

  • Parameters:

    • compressed (bool)

  • Returns: The public key serialized to bytes.

point()

  • Returns: (x, y)

verify(signature, message, hasher=sha256)

Verifies some message was signed by the owner of this public key.

  • Parameters:

    • signature (bytes) - The signature to verify.

    • message (bytes) - The message that was supposedly signed.

    • hasher - The hash function to use. hasher(message) must return 32 bytes.

  • Returns: bool

add(scalar, update=False)

  • Parameters:

    • scalar (bytes) - The scalar to add.

    • update - If True, will update and return self.

  • Returns: coincurve.PublicKey

multiply(scalar, update=False)

  • Parameters:

    • scalar (bytes) - The scalar to multiply.

    • update - If True, will update and return self.

  • Returns: coincurve.PublicKey

Project details

Verified details

These details have been verified by PyPI
Maintainers
Avatar for Ofekmeister from gravatar.com Ofekmeister

Unverified details

These details have not been verified by PyPI
Project links
Meta
  • License: MIT License (MIT)
  • Author: Ofek Lev
  • Tags secp256k1, elliptic curves, bitcoin, ethereum, cryptocurrency
Classifiers

Release history Release notifications | RSS feed

20.0.0

19.0.1

19.0.0 yanked

Reason this release was yanked:

broken on Windows

18.0.0

17.0.0

16.0.0

15.0.1

15.0.0

14.0.0

13.0.0

13.0.0rc1 pre-release

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