aea.helpers.secp256k1

secp256k1 compressed public key validation.

Replaces the ecdsa package for the single use case in aea.helpers.multiaddr.base: validating that a 33-byte compressed secp256k1 public key encodes a point on the curve.

Curve equation: y² = x³ + 7 (mod p)

validate_secp256k1_compressed_pubkey

def validate_secp256k1_compressed_pubkey(compressed: bytes) -> None

Validate a compressed secp256k1 public key.

A compressed key is 33 bytes: a 0x02 or 0x03 prefix byte followed by the 32-byte big-endian x coordinate. The prefix indicates the parity of the y coordinate. This function verifies that the x coordinate corresponds to a point on the secp256k1 curve.

Arguments:

• compressed: 33-byte compressed public key.

Raises:

• ValueError: if the key is malformed or not on the curve.