/*
* Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/bio.h>
#include <openssl/evp.h>
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include "testutil.h"
#ifndef OPENSSL_NO_SM2
# include "crypto/sm2.h"
static RAND_METHOD fake_rand;
static const RAND_METHOD *saved_rand;
static uint8_t *fake_rand_bytes = NULL;
static size_t fake_rand_bytes_offset = 0;
static size_t fake_rand_size = 0;
static int get_faked_bytes(unsigned char *buf, int num)
{
if (fake_rand_bytes == NULL)
return saved_rand->bytes(buf, num);
if (!TEST_size_t_gt(fake_rand_size, 0))
return 0;
while (num-- > 0) {
if (fake_rand_bytes_offset >= fake_rand_size)
fake_rand_bytes_offset = 0;
*buf++ = fake_rand_bytes[fake_rand_bytes_offset++];
}
return 1;
}
static int start_fake_rand(const char *hex_bytes)
{
/* save old rand method */
if (!TEST_ptr(saved_rand = RAND_get_rand_method()))
return 0;
fake_rand = *saved_rand;
/* use own random function */
fake_rand.bytes = get_faked_bytes;
fake_rand_bytes = OPENSSL_hexstr2buf(hex_bytes, NULL);
fake_rand_bytes_offset = 0;
fake_rand_size = strlen(hex_bytes) / 2;
/* set new RAND_METHOD */
if (!TEST_true(RAND_set_rand_method(&fake_rand)))
return 0;
return 1;
}
static int restore_rand(void)
{
OPENSSL_free(fake_rand_bytes);
fake_rand_bytes = NULL;
fake_rand_bytes_offset = 0;
if (!TEST_true(RAND_set_rand_method(saved_rand)))
return 0;
return 1;
}
static EC_GROUP *create_EC_group(const char *p_hex, const char *a_hex,
const char *b_hex, const char *x_hex,
const char *y_hex, const char *order_hex,
const char *cof_hex)
{
BIGNUM *p = NULL;
BIGNUM *a = NULL;
BIGNUM *b = NULL;
BIGNUM *g_x = NULL;
BIGNUM *g_y = NULL;
BIGNUM *order = NULL;
BIGNUM *cof = NULL;
EC_POINT *generator = NULL;
EC_GROUP *group = NULL;
int ok = 0;
if (!TEST_true(BN_hex2bn(&p, p_hex))
|| !TEST_true(BN_hex2bn(&a, a_hex))
|| !TEST_true(BN_hex2bn(&b, b_hex)))
goto done;
group = EC_GROUP_new_curve_GFp(p, a, b, NULL);
if (!TEST_ptr(group))
goto done;
generator = EC_POINT_new(group);
if (!TEST_ptr(generator))
goto done;
if (!TEST_true(BN_hex2bn(&g_x, x_hex))
|| !TEST_true(BN_hex2bn(&g_y, y_hex))
|| !TEST_true(EC_POINT_set_affine_coordinates(group, generator, g_x,
g_y, NULL)))
goto done;
if (!TEST_true(BN_hex2bn(&order, order_hex))
|| !TEST_true(BN_hex2bn(&cof, cof_hex))
|| !TEST_true(EC_GROUP_set_generator(group, generator, order, cof)))
goto done;
ok = 1;
done:
BN_free(p);
BN_free(a);
BN_free(b);
BN_free(g_x);
BN_free(g_y);
EC_POINT_free(generator);
BN_free(order);
BN_free(cof);
if (!ok) {
EC_GROUP_free(group);
group = NULL;
}
return group;
}
static int test_sm2_crypt(const EC_GROUP *group,
const EVP_MD *digest,
const char *privkey_hex,
const char *message,
const char *k_hex, const char *ctext_hex)
{
const size_t msg_len = strlen(message);
BIGNUM *priv = NULL;
EC_KEY *key = NULL;
EC_POINT *pt = NULL;
unsigned char *expected = OPENSSL_hexstr2buf(ctext_hex, NULL);
size_t ctext_len = 0;
size_t ptext_len = 0;
uint8_t *ctext = NULL;
uint8_t *recovered = NULL;
size_t recovered_len = msg_len;
int rc = 0;
if (!TEST_ptr(expected)
|| !TEST_true(BN_hex2bn(&priv, privkey_hex)))
goto done;
key = EC_KEY_new();
if (!TEST_ptr(key)
|| !TEST_true(EC_KEY_set_group(key, group))
|| !TEST_true(EC_KEY_set_private_key(key, priv)))
goto done;
pt = EC_POINT_new(group);
if (!TEST_ptr(pt)
|| !TEST_true(EC_POINT_mul(group, pt, priv, NULL, NULL, NULL))
|| !TEST_true(EC_KEY_set_public_key(key, pt))
|| !TEST_true(sm2_ciphertext_size(key, digest, msg_len, &ctext_len)))
goto done;
ctext = OPENSSL_zalloc(ctext_len);
if (!TEST_ptr(ctext))
goto done;
start_fake_rand(k_hex);
if (!TEST_true(sm2_encrypt(key, digest, (const uint8_t *)message, msg_len,
ctext, &ctext_len))) {
restore_rand();
goto done;
}
restore_rand();
if (!TEST_mem_eq(ctext, ctext_len, expected, ctext_len))
goto done;
if (!TEST_true(sm2_plaintext_size(key, digest, ctext_len, &ptext_len))
|| !TEST_int_eq(ptext_len, msg_len))
goto done;
recovered = OPENSSL_zalloc(ptext_len);
if (!TEST_ptr(recovered)
|| !TEST_true(sm2_decrypt(key, digest, ctext, ctext_len, recovered, &recovered_len))
|| !TEST_int_eq(recovered_len, msg_len)
|| !TEST_mem_eq(recovered, recovered_len, message, msg_len))
goto done;
rc = 1;
done:
BN_free(priv);
EC_POINT_free(pt);
OPENSSL_free(ctext);
OPENSSL_free(recovered);
OPENSSL_free(expected);
EC_KEY_free(key);
return rc;
}
static int sm2_crypt_test(void)
{
int testresult = 0;
EC_GROUP *test_group =
create_EC_group
("8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
"787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
"63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
"421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
"0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2",
"8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
"1");
if (!TEST_ptr(test_group))
goto done;
if (!test_sm2_crypt(
test_group,
EVP_sm3(),
"1649AB77A00637BD5E2EFE283FBF353534AA7F7CB89463F208DDBC2920BB0DA0",
"encryption standard",
"004C62EEFD6ECFC2B95B92FD6C3D9575148AFA17425546D49018E5388D49DD7B4F"
"0092e8ff62146873c258557548500ab2df2a365e0609ab67640a1f6d57d7b17820"
"008349312695a3e1d2f46905f39a766487f2432e95d6be0cb009fe8c69fd8825a7",
"307B0220245C26FB68B1DDDDB12C4B6BF9F2B6D5FE60A383B0D18D1C4144ABF1"
"7F6252E7022076CB9264C2A7E88E52B19903FDC47378F605E36811F5C07423A2"
"4B84400F01B804209C3D7360C30156FAB7C80A0276712DA9D8094A634B766D3A"
"285E07480653426D0413650053A89B41C418B0C3AAD00D886C00286467"))
goto done;
/* Same test as above except using SHA-256 instead of SM3 */
if (!test_sm2_crypt(
test_group,
EVP_sha256(),
"1649AB77A00637BD5E2EFE283FBF353534AA7F7CB89463F208DDBC2920BB0DA0",
"encryption standard",
"004C62EEFD6ECFC2B95B92FD6C3D9575148AFA17425546D49018E5388D49DD7B4F"
"003da18008784352192d70f22c26c243174a447ba272fec64163dd4742bae8bc98"
"00df17605cf304e9dd1dfeb90c015e93b393a6f046792f790a6fa4228af67d9588",
"307B0220245C26FB68B1DDDDB12C4B6BF9F2B6D5FE60A383B0D18D1C4144ABF17F"
"6252E7022076CB9264C2A7E88E52B19903FDC47378F605E36811F5C07423A24B84"
"400F01B80420BE89139D07853100EFA763F60CBE30099EA3DF7F8F364F9D10A5E9"
"88E3C5AAFC0413229E6C9AEE2BB92CAD649FE2C035689785DA33"))
goto done;
testresult = 1;
done:
EC_GROUP_free(test_group);
return testresult;
}
static int test_sm2_sign(const EC_GROUP *group,
const char *userid,
const char *privkey_hex,
const char *message,
const char *k_hex,
const char *r_hex,
const char *s_hex)
{
const size_t msg_len = strlen(message);
int ok = 0;
BIGNUM *priv = NULL;
EC_POINT *pt = NULL;
EC_KEY *key = NULL;
ECDSA_SIG *sig = NULL;
const BIGNUM *sig_r = NULL;
const BIGNUM *sig_s = NULL;
BIGNUM *r = NULL;
BIGNUM *s = NULL;
if (!TEST_true(BN_hex2bn(&priv, privkey_hex)))
goto done;
key = EC_KEY_new();
if (!TEST_ptr(key)
|| !TEST_true(EC_KEY_set_group(key, group))
|| !TEST_true(EC_KEY_set_private_key(key, priv)))
goto done;
pt = EC_POINT_new(group);
if (!TEST_ptr(pt)
|| !TEST_true(EC_POINT_mul(group, pt, priv, NULL, NULL, NULL))
|| !TEST_true(EC_KEY_set_public_key(key, pt)))
goto done;
start_fake_rand(k_hex);
sig = sm2_do_sign(key, EVP_sm3(), (const uint8_t *)userid, strlen(userid),
(const uint8_t *)message, msg_len);
if (!TEST_ptr(sig)) {
restore_rand();
goto done;
}
restore_rand();
ECDSA_SIG_get0(sig, &sig_r, &sig_s);
if (!TEST_true(BN_hex2bn(&r, r_hex))
|| !TEST_true(BN_hex2bn(&s, s_hex))
|| !TEST_BN_eq(r, sig_r)
|| !TEST_BN_eq(s, sig_s))
goto done;
ok = sm2_do_verify(key, EVP_sm3(), sig, (const uint8_t *)userid,
strlen(userid), (const uint8_t *)message, msg_len);
/* We goto done whether this passes or fails */
TEST_true(ok);
done:
ECDSA_SIG_free(sig);
EC_POINT_free(pt);
EC_KEY_free(key);
BN_free(priv);
BN_free(r);
BN_free(s);
return ok;
}
static int sm2_sig_test(void)
{
int testresult = 0;
/* From draft-shen-sm2-ecdsa-02 */
EC_GROUP *test_group =
create_EC_group
("8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
"787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
"63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
"421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
"0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2",
"8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
"1");
if (!TEST_ptr(test_group))
goto done;
if (!TEST_true(test_sm2_sign(
test_group,
"ALICE123@YAHOO.COM",
"128B2FA8BD433C6C068C8D803DFF79792A519A55171B1B650C23661D15897263",
"message digest",
"006CB28D99385C175C94F94E934817663FC176D925DD72B727260DBAAE1FB2F96F"
"007c47811054c6f99613a578eb8453706ccb96384fe7df5c171671e760bfa8be3a",
"40F1EC59F793D9F49E09DCEF49130D4194F79FB1EED2CAA55BACDB49C4E755D1",
"6FC6DAC32C5D5CF10C77DFB20F7C2EB667A457872FB09EC56327A67EC7DEEBE7")))
goto done;
testresult = 1;
done:
EC_GROUP_free(test_group);
return testresult;
}
#endif
int setup_tests(void)
{
#ifdef OPENSSL_NO_SM2
TEST_note("SM2 is disabled.");
#else
ADD_TEST(sm2_crypt_test);
ADD_TEST(sm2_sig_test);
#endif
return 1;
}