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#!/usr/bin/env python3
# Copyright (c) 2023 Random "Randy" Lattice and Sean Andersen
# Distributed under the MIT software license, see the accompanying
# file COPYING or https://www.opensource.org/licenses/mit-license.php.
'''
Generate a C file with ECDSA testvectors from the Wycheproof project.
'''
import json
import sys
filename_input = sys.argv[1]
with open(filename_input) as f:
doc = json.load(f)
num_groups = len(doc['testGroups'])
def to_c_array(x):
if x == "":
return ""
s = ',0x'.join(a+b for a,b in zip(x[::2], x[1::2]))
return "0x" + s
num_vectors = 0
offset_msg_running, offset_pk_running, offset_sig = 0, 0, 0
out = ""
messages = ""
signatures = ""
public_keys = ""
cache_msgs = {}
cache_public_keys = {}
for i in range(num_groups):
group = doc['testGroups'][i]
num_tests = len(group['tests'])
public_key = group['publicKey']
for j in range(num_tests):
test_vector = group['tests'][j]
# // 2 to convert hex to byte length
sig_size = len(test_vector['sig']) // 2
msg_size = len(test_vector['msg']) // 2
if test_vector['result'] == "invalid":
expected_verify = 0
elif test_vector['result'] == "valid":
expected_verify = 1
else:
raise ValueError("invalid result field")
if num_vectors != 0 and sig_size != 0:
signatures += ",\n "
new_msg = False
msg = to_c_array(test_vector['msg'])
msg_offset = offset_msg_running
# check for repeated msg
if msg not in cache_msgs:
if num_vectors != 0 and msg_size != 0:
messages += ",\n "
cache_msgs[msg] = offset_msg_running
messages += msg
new_msg = True
else:
msg_offset = cache_msgs[msg]
new_pk = False
pk = to_c_array(public_key['uncompressed'])
pk_offset = offset_pk_running
# check for repeated pk
if pk not in cache_public_keys:
if num_vectors != 0:
public_keys += ",\n "
cache_public_keys[pk] = offset_pk_running
public_keys += pk
new_pk = True
else:
pk_offset = cache_public_keys[pk]
signatures += to_c_array(test_vector['sig'])
out += " /" + "* tcId: " + str(test_vector['tcId']) + ". " + test_vector['comment'] + " *" + "/\n"
out += f" {{{pk_offset}, {msg_offset}, {msg_size}, {offset_sig}, {sig_size}, {expected_verify} }},\n"
if new_msg:
offset_msg_running += msg_size
if new_pk:
offset_pk_running += 65
offset_sig += sig_size
num_vectors += 1
struct_definition = """
typedef struct {
size_t pk_offset;
size_t msg_offset;
size_t msg_len;
size_t sig_offset;
size_t sig_len;
int expected_verify;
} wycheproof_ecdsa_testvector;
"""
print("/* Note: this file was autogenerated using tests_wycheproof_generate.py. Do not edit. */")
print(f"#define SECP256K1_ECDSA_WYCHEPROOF_NUMBER_TESTVECTORS ({num_vectors})")
print(struct_definition)
print("static const unsigned char wycheproof_ecdsa_messages[] = { " + messages + "};\n")
print("static const unsigned char wycheproof_ecdsa_public_keys[] = { " + public_keys + "};\n")
print("static const unsigned char wycheproof_ecdsa_signatures[] = { " + signatures + "};\n")
print("static const wycheproof_ecdsa_testvector testvectors[SECP256K1_ECDSA_WYCHEPROOF_NUMBER_TESTVECTORS] = {")
print(out)
print("};")
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