CompressPubkey encodes a public key to 33-byte compressed format.

DecompressPubkey parses a public key in the 33-byte compressed format.

RecoverPubkey returns the public key of the signer.

S256 returns a BitCurve which implements secp256k1.

Sign creates a recoverable ECDSA signature.

VerifySignature checks that the given pubkey created signature over message.

A BitCurve represents a Koblitz Curve with a=0.