EdDSA

Library for verifying EdDSA signatures on the Ed25519 curve

Implements signature verification and point decompression for EdDSA

Methods

function verify(bytes memory message, bytes memory signature, bytes32 pubkey) public returns (bool) 

Verifies an EdDSA signature against a message and public key

Decompresses the public key, converts to Weierstrass form, and verifies using EIP-6565

Name	Type	Description
message	bytes memory	The message that was signed
signature	bytes memory	The signature to verify, encoded as (r,s) coordinates
pubkey	bytes32	The compressed public key to verify against

Name	Type	Description
	bool	bool True if the signature is valid, false otherwise

function edDecompress(
        uint256 KPubC
    ) public returns (uint256 x, uint256 y) 

Decompresses an Ed25519 public key from its compressed form

If computed x doesn't match the sign bit, negates x mod p

Name	Type	Description
KPubC	uint256	The compressed public key point in Edwards form, with sign bit in MSB

Name	Type	Description
x	uint256	x The x-coordinate of the decompressed point on Edwards curve
y	uint256	y The y-coordinate of the decompressed point on Edwards curve