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tests: Add Wycheproof ECDSA vectors 

Adds a test using the Wycheproof vectors as outlined in #1106. The
vectors are taken from the Wycheproof repo. We use a python script
to convert the JSON-formatted vectors into C code.

Co-authored-by: Sean Andersen <6730974+andozw@users.noreply.github.com>
This commit is contained in:
RandomLattice 2023-03-21 22:10:59 -07:00
parent 9c8c4f443c
commit e5de454609
7 changed files with 8308 additions and 2 deletions
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17
Makefile.am
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@ -247,3 +247,20 @@ endif
if ENABLE_MODULE_SCHNORRSIG
include src/modules/schnorrsig/Makefile.am.include
endif
EXTRA_DIST += src/wycheproof/WYCHEPROOF_COPYING
EXTRA_DIST += src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h
EXTRA_DIST += src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.json
EXTRA_DIST += tools/tests_wycheproof_generate.py
TESTVECTORS = src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h
src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h: src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.json
python3 tools/tests_wycheproof_generate.py $< > $@
testvectors: $(TESTVECTORS)
maintainer-clean-testvectors: clean-testvectors
clean-testvectors:
rm -f $(TESTVECTORS)

4
ci/cirrus.sh
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@ -109,8 +109,8 @@ fi
# Rebuild precomputed files (if not cross-compiling).
if [ -z "$HOST" ]
then
make clean-precomp
make precomp
make clean-precomp clean-testvectors
make precomp testvectors
fi
# Check that no repo files have been modified by the build.

39
src/tests.c
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@ -7306,6 +7306,44 @@ static void run_ecdsa_edge_cases(void) {
test_ecdsa_edge_cases();
}
/** Wycheproof tests
The tests check for known attacks (range checks in (r,s), arithmetic errors, malleability).
*/
static void test_ecdsa_wycheproof(void) {
#include "wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h"
int t;
for (t = 0; t < SECP256K1_ECDSA_WYCHEPROOF_NUMBER_TESTVECTORS; t++) {
secp256k1_ecdsa_signature signature;
secp256k1_sha256 hasher;
secp256k1_pubkey pubkey;
const unsigned char *msg, *sig, *pk;
unsigned char out[32] = {0};
int actual_verify = 0;
memset(&pubkey, 0, sizeof(pubkey));
pk = &wycheproof_ecdsa_public_keys[testvectors[t].pk_offset];
CHECK(secp256k1_ec_pubkey_parse(CTX, &pubkey, pk, 65) == 1);
secp256k1_sha256_initialize(&hasher);
msg = &wycheproof_ecdsa_messages[testvectors[t].msg_offset];
secp256k1_sha256_write(&hasher, msg, testvectors[t].msg_len);
secp256k1_sha256_finalize(&hasher, out);
sig = &wycheproof_ecdsa_signatures[testvectors[t].sig_offset];
if (secp256k1_ecdsa_signature_parse_der(CTX, &signature, sig, testvectors[t].sig_len) == 1) {
actual_verify = secp256k1_ecdsa_verify(CTX, (const secp256k1_ecdsa_signature *)&signature, out, &pubkey);
}
CHECK(testvectors[t].expected_verify == actual_verify);
}
}
/* Tests cases from Wycheproof test suite. */
static void run_ecdsa_wycheproof(void) {
test_ecdsa_wycheproof();
}
#ifdef ENABLE_MODULE_ECDH
# include "modules/ecdh/tests_impl.h"
#endif
@ -7638,6 +7676,7 @@ int main(int argc, char **argv) {
run_ecdsa_sign_verify();
run_ecdsa_end_to_end();
run_ecdsa_edge_cases();
run_ecdsa_wycheproof();
#ifdef ENABLE_MODULE_RECOVERY
/* ECDSA pubkey recovery tests */

212
src/wycheproof/WYCHEPROOF_COPYING Normal file
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@ -0,0 +1,212 @@
* The file `ecdsa_secp256k1_sha256_bitcoin_test.json` in this directory
comes from Google's project Wycheproof with git commit
`b063b4aedae951c69df014cd25fa6d69ae9e8cb9`, see
https://github.com/google/wycheproof/blob/b063b4aedae951c69df014cd25fa6d69ae9e8cb9/testvectors_v1/ecdsa_secp256k1_sha256_bitcoin_test.json
* The file `ecdsa_secp256k1_sha256_bitcoin_test.h` is generated from
`ecdsa_secp256k1_sha256_bitcoin_test.json` using the script
`tests_wycheproof_generate.py`.
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src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.json Normal file
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114
tools/tests_wycheproof_generate.py Executable file
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@ -0,0 +1,114 @@
#!/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 hashlib
import urllib.request
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.keys():
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.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 += " {" + "{0}, {1}, {2}, {3}, {4}, {5}".format(
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("#define SECP256K1_ECDSA_WYCHEPROOF_NUMBER_TESTVECTORS ({})".format(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("};")