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refactor(crypto,core,lagacy): use secp256k1 submodule for ECDH

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This commit is contained in:
Ondřej Vejpustek 2024-08-02 16:46:43 +02:00
parent df2545b78e
commit 54eef8d886
9 changed files with 187 additions and 7 deletions
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3
core/SConscript.firmware
View File

@ -188,6 +188,7 @@ if FEATURE_FLAGS["SECP256K1_ZKP"]:
'ENABLE_MODULE_RECOVERY',
'ENABLE_MODULE_SCHNORRSIG',
'ENABLE_MODULE_EXTRAKEYS',
'ENABLE_MODULE_ECDH',
]
SOURCE_MOD_SECP256K1_ZKP = [
'vendor/secp256k1-zkp/src/secp256k1.c',
@ -779,7 +780,7 @@ obj_program = []
obj_program.extend(env.Object(source=SOURCE_MOD))
obj_program.extend(env.Object(source=SOURCE_MOD_CRYPTO, CCFLAGS='$CCFLAGS -ftrivial-auto-var-init=zero'))
if FEATURE_FLAGS["SECP256K1_ZKP"]:
obj_program.extend(env.Object(source=SOURCE_MOD_SECP256K1_ZKP, CCFLAGS='$CCFLAGS -Wno-unused-function'))
obj_program.extend(env.Object(source=SOURCE_MOD_SECP256K1_ZKP, CCFLAGS='$CCFLAGS -Wno-unused-function -Wno-maybe-uninitialized'))
source_files.extend(SOURCE_MOD_SECP256K1_ZKP)
obj_program.extend(env.Object(source=SOURCE_FIRMWARE))
obj_program.extend(env.Object(source=SOURCE_MICROPYTHON))

3
core/SConscript.unix
View File

@ -189,6 +189,7 @@ if FEATURE_FLAGS["SECP256K1_ZKP"]:
'ENABLE_MODULE_RECOVERY',
'ENABLE_MODULE_SCHNORRSIG',
'ENABLE_MODULE_EXTRAKEYS',
'ENABLE_MODULE_ECDH',
]
SOURCE_MOD_SECP256K1_ZKP = [
'vendor/secp256k1-zkp/src/secp256k1.c',
@ -824,7 +825,7 @@ source_files = SOURCE_MOD + SOURCE_MOD_CRYPTO + SOURCE_MICROPYTHON + SOURCE_UNIX
obj_program.extend(env.Object(source=SOURCE_MOD))
obj_program.extend(env.Object(source=SOURCE_MOD_CRYPTO, CCFLAGS='$CCFLAGS -ftrivial-auto-var-init=zero'))
if FEATURE_FLAGS["SECP256K1_ZKP"]:
obj_program.extend(env.Object(source=SOURCE_MOD_SECP256K1_ZKP, CCFLAGS='$CCFLAGS -Wno-unused-function'))
obj_program.extend(env.Object(source=SOURCE_MOD_SECP256K1_ZKP, CCFLAGS='$CCFLAGS -Wno-unused-function -Wno-maybe-uninitialized'))
source_files.extend(SOURCE_MOD_SECP256K1_ZKP)
obj_program.extend(env.Object(source=SOURCE_MICROPYTHON))
obj_program.extend(env.Object(source=SOURCE_UNIX))

3
crypto/Makefile
View File

@ -69,7 +69,8 @@ ZKP_CFLAGS = \
-DENABLE_MODULE_GENERATOR \
-DENABLE_MODULE_RECOVERY \
-DENABLE_MODULE_SCHNORRSIG \
-DENABLE_MODULE_EXTRAKEYS
-DENABLE_MODULE_EXTRAKEYS \
-DENABLE_MODULE_ECDH
ZKP_PATH = ../vendor/secp256k1-zkp
# this is specific for 64-bit builds
CFLAGS += -DSECP256K1_CONTEXT_SIZE=208

14
crypto/ecdsa.c
View File

@ -635,8 +635,8 @@ int scalar_multiply(const ecdsa_curve *curve, const bignum256 *k,
#endif
int ecdh_multiply(const ecdsa_curve *curve, const uint8_t *priv_key,
const uint8_t *pub_key, uint8_t *session_key) {
int tc_ecdh_multiply(const ecdsa_curve *curve, const uint8_t *priv_key,
const uint8_t *pub_key, uint8_t *session_key) {
curve_point point = {0};
if (!ecdsa_read_pubkey(curve, pub_key, &point)) {
return 1;
@ -1312,3 +1312,13 @@ int ecdsa_recover_pub_from_sig(const ecdsa_curve *curve, uint8_t *pub_key,
#endif
return tc_ecdsa_recover_pub_from_sig(curve, pub_key, sig, digest, recid);
}
int ecdh_multiply(const ecdsa_curve *curve, const uint8_t *priv_key,
const uint8_t *pub_key, uint8_t *session_key) {
#ifdef USE_SECP256K1_ZKP_ECDSA
if (curve == &secp256k1) {
return zkp_ecdh_multiply(curve, priv_key, pub_key, session_key);
}
#endif
return tc_ecdh_multiply(curve, priv_key, pub_key, session_key);
}

3
crypto/ecdsa_internal.h
View File

@ -39,5 +39,6 @@ int tc_ecdsa_verify_digest(const ecdsa_curve *curve, const uint8_t *pub_key,
int tc_ecdsa_recover_pub_from_sig(const ecdsa_curve *curve, uint8_t *pub_key,
const uint8_t *sig, const uint8_t *digest,
int recid);
int tc_ecdh_multiply(const ecdsa_curve *curve, const uint8_t *priv_key,
const uint8_t *pub_key, uint8_t *session_key);
#endif

86
crypto/tests/test_check.c
View File

@ -4426,6 +4426,90 @@ START_TEST(test_aes) {
}
END_TEST
static void test_ecdh_multiply_helper(
int (*ecdh_multiply_fn)(const ecdsa_curve *curve, const uint8_t *priv_key,
const uint8_t *pub_key, uint8_t *session_key)) {
static struct {
const char *priv_key;
const char *pub_key;
int res;
const char *session_key;
} tests[] = {
// Compressed public key
{"1618cc490a4a5b38d9f877759a2c312026fe9f459edb9ba49e91b6de4a237cad",
"0322c16706cd0d80dbb4e314799ba1323420e7ffa859a0cf0c82a444192bb6c997", 0,
"047b27ebb15e8197c9a560afc1bd45e2a78b864829fc1257333a1a2d7d30d79eed17889"
"8ad4960f756cf155cf46d22f2e3b21df10ee5bad560c467ae0d79427a70"},
// Uncompressed public key
{"55b57f9ffc79d206eaa2b25dd5fe5a0be2d9d880ddfa777a3a0f9c0b2d3a191e",
"04816c5bb10c97b96a0b02382b8f8c1a8876218af04396976dace353a139752c6baef57"
"449121650cefca54cf9ac4e304890ada667512b5d98171b54a5a8347b09",
0,
"049b3ab299d119eb89b632ff63ed0b3790508a0020fd729bbc35f39d221101ac5edc3be"
"e252886ea8f68c835ed410b715d41e967d0bd10a01a4b01eaa2320a7f4d"},
// Invalid compressed public key
{"d2ffd4daa78a7fb253edb315e27f5841df00a581ab2c3330ffded22be98b7c96",
"026a575a9f3d4e945366a78e7961b312018451df8485ee1210767a0575225c2764", 1,
""},
// Invalid uncompressed public key
{"7da05844e870b1674c14a9a80b45ef36d221680707b727a7b6c70b2a25e99717",
"71ebf221ab355d070a570525e4c4bff94b27ca97e67fcdfb993f6546e7e1ead0ea09ed1"
"f7e55282f2787c7fc54cc5815660641cd95148a4b56f15818a04c7f72",
1, ""},
// Invalid compressed public key - the point at infinity
{"6753537e70935a9c85b0bad5b2aa54fb565b50bcf086acc7836a94318bc442d4",
"000000000000000000000000000000000000000000000000000000000000000000", 1,
""},
// Invalid uncompressed public key - the point at infinity
{"6753537e70935a9c85b0bad5b2aa54fb565b50bcf086acc7836a94318bc442d4",
"0000000000000000000000000000000000000000000000000000000000000000000000"
"0"
"00000000000000000000000000000000000000000000000000000000000",
1, ""},
// Invalid private key - the group order
{"fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141",
"02e38ad3515c21358659ef113864b26e6caaa6bb780ce02daaf1c13f4fe24bb632", 2,
""},
// Invalid private key - zero
{"0000000000000000000000000000000000000000000000000000000000000000",
"038325242a489e883afdc86da5a714e4ffc86530e1b6660ac87ffb87c0045e486c", 2,
""},
};
const ecdsa_curve *curve = &secp256k1;
uint8_t priv_key[32] = {0};
uint8_t pub_key[65] = {0};
uint8_t session_key[65] = {0};
uint8_t expected_session_key[65] = {0};
int expected_res = 0;
int res = 0;
for (size_t i = 0; i < sizeof(tests) / sizeof(*tests); i++) {
memcpy(priv_key, fromhex(tests[i].priv_key), 32);
memcpy(pub_key, fromhex(tests[i].pub_key), 65);
expected_res = tests[i].res;
if (expected_res == 0) {
memcpy(expected_session_key, fromhex(tests[i].session_key), 65);
}
res = ecdh_multiply_fn(curve, priv_key, pub_key, session_key);
ck_assert_int_eq(expected_res, res);
if (expected_res == 0) {
ck_assert_mem_eq(expected_session_key, session_key, 65);
}
}
}
START_TEST(test_tc_ecdh_multiply) {
test_ecdh_multiply_helper(tc_ecdh_multiply);
}
END_TEST
START_TEST(test_zkp_ecdh_multiply) {
test_ecdh_multiply_helper(zkp_ecdh_multiply);
}
END_TEST
// test vectors from
// https://datatracker.ietf.org/doc/html/rfc3610
// https://doi.org/10.6028/NIST.SP.800-38C
@ -11351,10 +11435,12 @@ Suite *test_suite(void) {
tcase_add_test(tc, test_tc_ecdsa_get_public_key65);
tcase_add_test(tc, test_tc_ecdsa_recover_pub_from_sig);
tcase_add_test(tc, test_tc_ecdsa_verify_digest);
tcase_add_test(tc, test_tc_ecdh_multiply);
tcase_add_test(tc, test_zkp_ecdsa_get_public_key33);
tcase_add_test(tc, test_zkp_ecdsa_get_public_key65);
tcase_add_test(tc, test_zkp_ecdsa_recover_pub_from_sig);
tcase_add_test(tc, test_zkp_ecdsa_verify_digest);
tcase_add_test(tc, test_zkp_ecdh_multiply);
#if USE_RFC6979
tcase_add_test(tc, test_tc_ecdsa_sign_digest_deterministic);
tcase_add_test(tc, test_zkp_ecdsa_sign_digest_deterministic);

77
crypto/zkp_ecdsa.c
View File

@ -29,6 +29,7 @@
#include "zkp_context.h"
#include "vendor/secp256k1-zkp/include/secp256k1.h"
#include "vendor/secp256k1-zkp/include/secp256k1_ecdh.h"
#include "vendor/secp256k1-zkp/include/secp256k1_extrakeys.h"
#include "vendor/secp256k1-zkp/include/secp256k1_preallocated.h"
#include "vendor/secp256k1-zkp/include/secp256k1_recovery.h"
@ -403,3 +404,79 @@ int zkp_ecdsa_verify(const ecdsa_curve *curve, HasherType hasher_type,
memzero(hash, sizeof(hash));
return result;
}
static int plain_hash_function(unsigned char *output, const unsigned char *x32,
const unsigned char *y32, void *data) {
(void)data;
output[0] = 0x04;
memcpy(output + 1, x32, 32);
memcpy(output + 33, y32, 32);
return 1;
}
// ECDH multiplication
// curve has to be &secp256k1
// private_key_bytes has 32 bytes
// public_key_bytes has 33 or 65 bytes
// session key has 65 bytes
// returns 0 on success
int zkp_ecdh_multiply(const ecdsa_curve *curve,
const uint8_t *private_key_bytes,
const uint8_t *public_key_bytes, uint8_t *session_key) {
assert(curve == &secp256k1);
if (curve != &secp256k1) {
return 1;
}
int result = 0;
int public_key_length = 0;
if (result == 0) {
if (public_key_bytes[0] == 0x04) {
public_key_length = 65;
} else if (public_key_bytes[0] == 0x02 || public_key_bytes[0] == 0x03) {
public_key_length = 33;
} else {
result = 1;
}
}
const secp256k1_context *context_read_only = zkp_context_get_read_only();
secp256k1_pubkey public_key = {0};
if (result == 0) {
if (secp256k1_ec_pubkey_parse(context_read_only, &public_key,
public_key_bytes, public_key_length) != 1) {
result = 1;
}
}
secp256k1_context *context_writable = NULL;
if (result == 0) {
context_writable = zkp_context_acquire_writable();
if (context_writable == NULL) {
result = 1;
}
}
if (result == 0) {
if (secp256k1_context_writable_randomize(context_writable) != 0) {
result = 1;
}
}
if (result == 0) {
if (secp256k1_ecdh(context_writable, session_key, &public_key,
private_key_bytes, plain_hash_function, NULL) != 1) {
result = 2;
}
}
if (context_writable) {
zkp_context_release_writable();
context_writable = NULL;
}
memzero(&public_key, sizeof(public_key));
return result;
}

2
crypto/zkp_ecdsa.h
View File

@ -27,4 +27,6 @@ int zkp_ecdsa_verify_digest(const ecdsa_curve *curve,
int zkp_ecdsa_verify(const ecdsa_curve *curve, HasherType hasher_sign,
const uint8_t *pub_key, const uint8_t *sig,
const uint8_t *msg, uint32_t msg_len);
int zkp_ecdh_multiply(const ecdsa_curve *curve, const uint8_t *priv_key,
const uint8_t *pub_key, uint8_t *session_key);
#endif

3
legacy/firmware/Makefile
View File

@ -23,7 +23,8 @@ ZKP_CFLAGS = \
-DENABLE_MODULE_GENERATOR \
-DENABLE_MODULE_RECOVERY \
-DENABLE_MODULE_SCHNORRSIG \
-DENABLE_MODULE_EXTRAKEYS
-DENABLE_MODULE_EXTRAKEYS \
-DENABLE_MODULE_ECDH
OBJS += secp256k1-zkp.o
OBJS += precomputed_ecmult.o