criptolib

class CryptoLib

Bases: object

A class used to represent the CryptoLib native contract.

Check out Neo’s Documentation to learn more about the CryptoLib class.

hash: UInt160

classmethod murmur32(data: bytes, seed: int) → bytes

Computes the hash value for the specified byte array using the murmur32 algorithm.

>>> CryptoLib.murmur32(b'unit test', 0)
b"\x90D'G"

Parameters:

• data (bytes) – the input to compute the hash code for

• seed (int) – the seed of the murmur32 hash function

Returns:

the hash value

Return type:

bytes

classmethod sha256(key: Any) → bytes

Encrypts a key using SHA-256.

>>> CryptoLib.sha256('unit test')
b'\xdau1>J\xc2W\xf8LN\xfb2\x0f\xbd\x01\x1cr@<\xf5\x93<\x90\xd2\xe3\xb8$\xd6H\x96\xf8\x9a'

>>> CryptoLib.sha256(10)
b'\x9c\x82r\x01\xb9@\x19\xb4/\x85pk\xc4\x9cY\xff\x84\xb5`M\x11\xca\xaf\xb9\n\xb9HV\xc4\xe1\xddz'

Parameters:

key (Any) – the key to be encrypted

Returns:

a byte value that represents the encrypted key

Return type:

bytes

classmethod ripemd160(key: Any) → bytes

Encrypts a key using RIPEMD-160.

>>> CryptoLib.ripemd160('unit test')
b'H\x8e\xef\xf4Zh\x89:\xe6\xf1\xdc\x08\xdd\x8f\x01\rD\n\xbdH'

>>> CryptoLib.ripemd160(10)
b'\xc0\xda\x02P8\xed\x83\xc6\x87\xdd\xc40\xda\x98F\xec\xb9\x7f9\x98'

Parameters:

key (Any) – the key to be encrypted

Returns:

a byte value that represents the encrypted key

Return type:

bytes

classmethod verify_with_ecdsa(message: bytes, pubkey: ECPoint, signature: bytes, curve: NamedCurve) → bool

Using the elliptic curve, it checks if the signature of the message was originally produced by the public key.

>>> CryptoLib.verify_with_ecdsa(b'unit test', ECPoint(b'\x03\x5a\x92\x8f\x20\x16\x39\x20\x4e\x06\xb4\x36\x8b\x1a\x93\x36\x54\x62\xa8\xeb\xbf\xf0\xb8\x81\x81\x51\xb7\x4f\xaa\xb3\xa2\xb6\x1a'),
...                             b'wrong_signature', NamedCurve.SECP256R1)
False

Parameters:

• message (bytes) – the encrypted message

• pubkey (ECPoint) – the public key that might have created the item

• signature (bytes) – the signature of the item

• curve (NamedCurve) – the curve that will be used by the ecdsa

Returns:

a boolean value that represents whether the signature is valid

Return type:

bool

classmethod bls12_381_add(x: IBls12381, y: IBls12381) → IBls12381

Add operation of two bls12381 points.

Parameters:

• x (IBls12381) – The first point

• y (IBls12381) – The second point

Returns:

the two points sum

Return type:

IBls12381

classmethod bls12_381_deserialize(data: bytes) → IBls12381

Deserialize a bls12381 point.

Parameters:

data (bytes) – The point as byte array

Returns:

the deserialized point

Return type:

IBls12381

classmethod bls12_381_equal(x: IBls12381, y: IBls12381) → bool

Determines whether the specified points are equal.

Parameters:

• x (IBls12381) – The first point

• y (IBls12381) – The second point

Returns:

whether the specified points are equal or not

Return type:

bool

classmethod bls12_381_mul(x: IBls12381, mul: bytes, neg: bool) → IBls12381

Mul operation of gt point and multiplier.

Parameters:

• x (IBls12381) – The point

• mul (int) – Multiplier, 32 bytes, little-endian

• neg (bool) – negative number

Returns:

the two points product

Return type:

IBls12381

classmethod bls12_381_pairing(g1: IBls12381, g2: IBls12381) → IBls12381

Pairing operation of g1 and g2.

Parameters:

• g1 (IBls12381) – The g1 point

• g2 (IBls12381) – The g2 point

Returns:

the two points pairing

Return type:

IBls12381

classmethod bls12_381_serialize(g: IBls12381) → bytes

Serialize a bls12381 point.

Parameters:

g (IBls12381) – The point to be serialized.

Returns:

the serialized point

Return type:

bytes

class NamedCurve(value, names=None, *, module=None, qualname=None, type=None, start=1, boundary=None)

Bases: IntFlag

Represents the named curve used in ECDSA.

Check out Neo’s Documentation to learn more about ECDSA signing.

SECP256K1

The secp256k1 curve.

SECP256R1

The secp256r1 curve, which known as prime256v1 or nistP-256.

class IBls12381

Bases: object