/******************************************************************************
*
* Copyright 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#include <stdarg.h>
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include "bt_trace.h"
#include "hcidefs.h"
#include "stack/include/smp_api.h"
#include "stack/smp/p_256_ecc_pp.h"
#include "stack/smp/smp_int.h"
/*
* This test verifies various key distribution methods in SMP works using the
* following parameter set:
*
* When testing target as Master (Initiator is local, Responder is remote)
*
* Initiator's Pairing Request: 0x070710000001(01)
* Responder's Pairing Response: 0x050008000003(02)
* Initiator's Bluetooth Address: 0xA1A2A3A4A5A6
* Initiator's Bluetooth Address Type: 0x01
* Responder's Bluetooth Address: 0xB1B2B3B4B5B6
* Responder's Bluetooth Address Type: 0x00
* Initiator's Random Number: 0x5783D52156AD6F0E6388274EC6702EE0
* TK Encryption Key: 0x0
*
* Correct values:
*
* p1: 0x05000800000302070710000001010001
* p1 XOR r: 0x5283dd2156ae6d096498274ec7712ee1
* p1 prime: 0x02c7aa2a9857ac866ff91232df0e3c95
* p2: 0x00000000a1a2a3a4a5a6b1b2b3b4b5b6
* MConfirm (c1): 0x1e1e3fef878988ead2a74dc5bef13b86
*
* NOTE: All these values are presented in mathematical reasonable canonical
* form that has MSB on the left and LSB on the right. In Bluetooth packets,
* they are mostly reversed to be Little Endian which have LSB on the left and
* MSB on the right.
*/
// Set remote bda to 0xB1B2B3B4B5B6
bool BTM_ReadRemoteConnectionAddr(const RawAddress& pseudo_addr,
RawAddress& conn_addr,
tBLE_ADDR_TYPE* p_addr_type) {
conn_addr = RawAddress({0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6});
*p_addr_type = 0x00;
return true;
}
// Set local_bda to 0xA1A2A3A4A5A6
void BTM_ReadConnectionAddr(const RawAddress& remote_bda,
RawAddress& local_conn_addr,
tBLE_ADDR_TYPE* p_addr_type) {
local_conn_addr = RawAddress({0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6});
*p_addr_type = 0x01;
}
// Require bte_logmsg.cc to run, here is just to fake it as we don't care about
// trace in unit test
void LogMsg(uint32_t trace_set_mask, const char* fmt_str, ...) {
va_list args;
va_start(args, fmt_str);
vprintf(fmt_str, args);
va_end(args);
}
extern Octet16 smp_gen_p1_4_confirm(tSMP_CB* p_cb,
tBLE_ADDR_TYPE remote_bd_addr_type);
extern Octet16 smp_gen_p2_4_confirm(tSMP_CB* p_cb,
const RawAddress& remote_bda);
extern tSMP_STATUS smp_calculate_comfirm(tSMP_CB* p_cb, const Octet16& rand,
Octet16* output);
namespace testing {
void dump_uint128(const Octet16& a, char* buffer) {
for (unsigned int i = 0; i < OCTET16_LEN; ++i) {
snprintf(buffer, 3, "%02x", a[i]);
buffer += 2;
}
*buffer = '\0';
}
void dump_uint128_reverse(const Octet16& a, char* buffer) {
for (int i = (int)(OCTET16_LEN - 1); i >= 0; --i) {
snprintf(buffer, 3, "%02x", a[i]);
buffer += 2;
}
*buffer = '\0';
}
void print_uint128(const Octet16& a) {
for (unsigned int i = 0; i < OCTET16_LEN; ++i) {
printf("%02x", a[i]);
}
printf("\n");
}
Octet16 parse_uint128(const char* input) {
Octet16 output{0};
for (unsigned int count = 0; count < OCTET16_LEN; count++) {
sscanf(input, "%2hhx", &output[count]);
input += 2;
}
return output;
}
class SmpCalculateConfirmTest : public Test {
protected:
tSMP_CB p_cb_;
// Set random to 0x5783D52156AD6F0E6388274EC6702EE0
Octet16 rand_{0x57, 0x83, 0xD5, 0x21, 0x56, 0xAD, 0x6F, 0x0E,
0x63, 0x88, 0x27, 0x4E, 0xC6, 0x70, 0x2E, 0xE0};
void SetUp() {
p_cb_.tk = {0};
// Set pairing request packet to 0x070710000001(01)
p_cb_.local_io_capability = 0x01;
p_cb_.loc_oob_flag = 0x00;
p_cb_.loc_auth_req = 0x00;
p_cb_.loc_enc_size = 0x10;
p_cb_.local_i_key = 0x07;
p_cb_.local_r_key = 0x07;
// Set pairing response packet to 0x050008000003(02)
p_cb_.peer_io_caps = 0x03;
p_cb_.peer_oob_flag = 0x00;
p_cb_.peer_auth_req = 0x00;
p_cb_.peer_enc_size = 0x08;
p_cb_.peer_i_key = 0x00;
p_cb_.peer_r_key = 0x05;
// Set role to master
p_cb_.role = HCI_ROLE_MASTER;
std::reverse(rand_.begin(), rand_.end());
}
void TearDown() {}
public:
};
// Test smp_gen_p2_4_confirm function implementation
TEST_F(SmpCalculateConfirmTest, test_smp_gen_p2_4_confirm_as_master) {
RawAddress remote_bda;
tBLE_ADDR_TYPE remote_bd_addr_type = 0;
BTM_ReadRemoteConnectionAddr(p_cb_.pairing_bda, remote_bda,
&remote_bd_addr_type);
BTM_ReadConnectionAddr(p_cb_.pairing_bda, p_cb_.local_bda, &p_cb_.addr_type);
Octet16 p2 = smp_gen_p2_4_confirm(&p_cb_, remote_bda);
// Correct p2 is 0x00000000a1a2a3a4a5a6b1b2b3b4b5b6
const char expected_p2_str[] = "00000000a1a2a3a4a5a6b1b2b3b4b5b6";
char p2_str[2 * OCTET16_LEN + 1];
dump_uint128_reverse(p2, p2_str);
ASSERT_THAT(p2_str, StrEq(expected_p2_str));
}
// Test smp_gen_p1_4_confirm and aes_128 function implementation
TEST_F(SmpCalculateConfirmTest, test_aes_128_as_master) {
RawAddress remote_bda;
tBLE_ADDR_TYPE remote_bd_addr_type = 0;
BTM_ReadRemoteConnectionAddr(p_cb_.pairing_bda, remote_bda,
&remote_bd_addr_type);
BTM_ReadConnectionAddr(p_cb_.pairing_bda, p_cb_.local_bda, &p_cb_.addr_type);
Octet16 p1 = smp_gen_p1_4_confirm(&p_cb_, remote_bd_addr_type);
// Correct p1 is 0x05000800000302070710000001010001
const char expected_p1_str[] = "05000800000302070710000001010001";
char p1_str[2 * OCTET16_LEN + 1];
dump_uint128_reverse(p1, p1_str);
ASSERT_THAT(p1_str, StrEq(expected_p1_str));
smp_xor_128(&p1, rand_);
// Correct p1 xor r is 0x5283dd2156ae6d096498274ec7712ee1
const char expected_p1_xor_r_str[] = "5283dd2156ae6d096498274ec7712ee1";
char p1_xor_r_str[2 * OCTET16_LEN + 1];
dump_uint128_reverse(p1, p1_xor_r_str);
ASSERT_THAT(p1_xor_r_str, StrEq(expected_p1_xor_r_str));
Octet16 output = crypto_toolbox::aes_128(p_cb_.tk, p1.data(), OCTET16_LEN);
const char expected_p1_prime_str[] = "02c7aa2a9857ac866ff91232df0e3c95";
char p1_prime_str[2 * OCTET16_LEN + 1];
dump_uint128_reverse(output, p1_prime_str);
ASSERT_THAT(p1_prime_str, StrEq(expected_p1_prime_str));
}
// Test smp_calculate_comfirm function implementation
TEST_F(SmpCalculateConfirmTest, test_smp_calculate_comfirm_as_master) {
Octet16 output;
tSMP_STATUS status = smp_calculate_comfirm(&p_cb_, rand_, &output);
EXPECT_EQ(status, SMP_SUCCESS);
// Correct MConfirm is 0x1e1e3fef878988ead2a74dc5bef13b86
const char expected_confirm_str[] = "1e1e3fef878988ead2a74dc5bef13b86";
char confirm_str[2 * OCTET16_LEN + 1];
dump_uint128_reverse(output, confirm_str);
ASSERT_THAT(confirm_str, StrEq(expected_confirm_str));
}
// Test ECC point validation
TEST(SmpEccValidationTest, test_valid_points) {
Point p;
// Test data from Bluetooth Core Specification
// Version 5.0 | Vol 2, Part G | 7.1.2
// Sample 1
p.x[7] = 0x20b003d2;
p.x[6] = 0xf297be2c;
p.x[5] = 0x5e2c83a7;
p.x[4] = 0xe9f9a5b9;
p.x[3] = 0xeff49111;
p.x[2] = 0xacf4fddb;
p.x[1] = 0xcc030148;
p.x[0] = 0x0e359de6;
p.y[7] = 0xdc809c49;
p.y[6] = 0x652aeb6d;
p.y[5] = 0x63329abf;
p.y[4] = 0x5a52155c;
p.y[3] = 0x766345c2;
p.y[2] = 0x8fed3024;
p.y[1] = 0x741c8ed0;
p.y[0] = 0x1589d28b;
EXPECT_TRUE(ECC_ValidatePoint(p));
// Sample 2
p.x[7] = 0x2c31a47b;
p.x[6] = 0x5779809e;
p.x[5] = 0xf44cb5ea;
p.x[4] = 0xaf5c3e43;
p.x[3] = 0xd5f8faad;
p.x[2] = 0x4a8794cb;
p.x[1] = 0x987e9b03;
p.x[0] = 0x745c78dd;
p.y[7] = 0x91951218;
p.y[6] = 0x3898dfbe;
p.y[5] = 0xcd52e240;
p.y[4] = 0x8e43871f;
p.y[3] = 0xd0211091;
p.y[2] = 0x17bd3ed4;
p.y[1] = 0xeaf84377;
p.y[0] = 0x43715d4f;
EXPECT_TRUE(ECC_ValidatePoint(p));
}
TEST(SmpEccValidationTest, test_invalid_points) {
Point p;
multiprecision_init(p.x, 8);
multiprecision_init(p.y, 8);
EXPECT_FALSE(ECC_ValidatePoint(p));
// Sample 1
p.x[7] = 0x20b003d2;
p.x[6] = 0xf297be2c;
p.x[5] = 0x5e2c83a7;
p.x[4] = 0xe9f9a5b9;
p.x[3] = 0xeff49111;
p.x[2] = 0xacf4fddb;
p.x[1] = 0xcc030148;
p.x[0] = 0x0e359de6;
EXPECT_FALSE(ECC_ValidatePoint(p));
p.y[7] = 0xdc809c49;
p.y[6] = 0x652aeb6d;
p.y[5] = 0x63329abf;
p.y[4] = 0x5a52155c;
p.y[3] = 0x766345c2;
p.y[2] = 0x8fed3024;
p.y[1] = 0x741c8ed0;
p.y[0] = 0x1589d28b;
p.y[0]--;
EXPECT_FALSE(ECC_ValidatePoint(p));
}
} // namespace testing