Parse a compact ECDSA signature (64 bytes + recovery id).
1 when the signature could be parsed, 0 otherwise Args: ctx: a secp256k1 context object Out: sig: a pointer to a signature object In: input64: a pointer to a 64-byte compact signature recid: the recovery id (0, 1, 2 or 3)
See Implementation
Parse a compact ECDSA signature (64 bytes + recovery id).