coincurve 5.2.0

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, can be None. 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, custom_nonce=None)

• Parameters:

  • message (bytes) - The message to sign.

  • hasher - The hash function to use, can be None. hasher(message) must return 32 bytes.

  • custom_nonce - A tuple of arity 2 in the form of (nonce_fn, nonce_data). Refer to: secp256k1.h

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

sign_recoverable(message, hasher=sha256)

• Parameters:

  • message (bytes) - The message to sign.

  • hasher - The hash function to use, can be None. 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 (bool) - If True, will update and return self.

• Returns: coincurve.PrivateKey

multiply(scalar, update=False)

• Parameters:

  • scalar (bytes) - The scalar to multiply.

  • update (bool) - 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)

classmethod combine_keys(public_keys, context=GLOBAL_CONTEXT)

• Parameters:

  • public_keys (list) - A list of coincurve.PublicKey to add.

  • context (coincurve.Context)

• Returns: coincurve.PublicKey

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, can be None. hasher(message) must return 32 bytes.

• Returns: bool

add(scalar, update=False)

• Parameters:

  • scalar (bytes) - The scalar to add.

  • update (bool) - If True, will update and return self.

• Returns: coincurve.PublicKey

multiply(scalar, update=False)

• Parameters:

  • scalar (bytes) - The scalar to multiply.

  • update (bool) - If True, will update and return self.

• Returns: coincurve.PublicKey

combine(public_keys, update=False)

• Parameters:

  • public_keys (list) - A list of coincurve.PublicKey to add.

  • update (bool) - If True, will update and return self.

• Returns: coincurve.PublicKey

5.2.0

• Added support for supplying a custom nonce to PrivateKey.sign.

5.1.0

• Added PublicKey.combine_keys class method.

• Improvements to documentation.

5.0.1

• Fixed an issue where validate_secret would occasionally erroneously error on user-provided secrets (secrets not generated by Coincurve itself) if there were not exactly 256 bits of entropy. See #5

5.0.0

• Breaking: Coincurve is now dual-licensed under the terms of MIT and Apache v2.0.

• Performance improvements from libsecp256k1 master: 1 2 3 4 5 6

• Improvements to documentation.

4.5.1

• First public stable release