pubkey.cpp File Reference

#include <pubkey.h>
#include <secp256k1.h>
#include <secp256k1_recovery.h>

Namespaces
	anonymous_namespace{pubkey.cpp}

Functions
static int	ecdsa_signature_parse_der_lax (const secp256k1_context *ctx, secp256k1_ecdsa_signature *sig, const unsigned char *input, size_t inputlen)

Variables
secp256k1_context *	anonymous_namespace{pubkey.cpp}::secp256k1_context_verify = nullptr

Function Documentation

ecdsa_signature_parse_der_lax()

static int ecdsa_signature_parse_der_lax ( const secp256k1_context *  ctx, secp256k1_ecdsa_signature *  sig, const unsigned char *  input, size_t  inputlen  )

static

This function is taken from the libsecp256k1 distribution and implements DER parsing for ECDSA signatures, while supporting an arbitrary subset of format violations.

Supported violations include negative integers, excessive padding, garbage at the end, and overly long length descriptors. This is safe to use in Bitcoin because since the activation of BIP66, signatures are verified to be strict DER before being passed to this module, and we know it supports all violations present in the blockchain before that point.