華為雲IoT裝置接入密碼C語言生成
Andy 2021-3-18
一、問題
去年給客戶（華為SaaS生态鍊企業，名字匿了）定制了一款高成本效益DTU網關，支援協定定制、遠端配置、斷緩續傳。
有些朋友想拿樣品測試，問題來了：
網關接入華為IoT雲的參數（ClientId、Username、Password等）一般是從客戶的應用背景擷取，如果沒有背景或者背景對接比較麻煩怎麼辦？
先看看這些參數是怎麼來的：
https://support.huaweicloud.com/api-iothub/iot_06_v5_3009.html
1. ClientId
(1) 裝置ID
① 産品ID
② 裝置辨別碼
(2) 時間戳
2. Username
裝置ID
3. Password
由HMACSHA256算法生成
(1) 加密密鑰：時間戳
(2) 明文：裝置密鑰。
以上各個參數中，隻有裝置标志碼每個裝置不同，其他均為固定值，即裝置與雲平台保持一緻即可，核心是實作HMACSHA256算法（正好在宇宙四大行做加密謀生-_-||），以下簡要分述。
二、雲平台
客戶用自己的華為雲賬号按以下參數建立産品、注冊裝置後，不必配置任何參數，網關即可自動上雲。
三、工具生成
https://iot-tool.obs-website.cn-north-4.myhuaweicloud.com/
四、算法檢驗
http://www.jsons.cn/allencrypt/
五、代碼生成
X86平台有openSSL，JAVA有Cipher包，瘦弱的MCU隻能直接用源代碼了，感謝這位大兄弟（不知是不是扒的openSSL源碼？）：
https://blog.csdn.net/miniphoenix/article/details/110135164
代碼扒下來精簡了下，輸出由hex改為string，OK~
// HMAC_SHA256.c
#include "HMAC_SHA256.h"
#include "stdint.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//------------------------------------------------------------------------------
#define SHA256_BLOCKLEN 64ul //size of message block buffer
#define SHA256_DIGESTLEN 32ul //size of digest in uint8_t
#define SHA256_DIGESTINT 8ul //size of digest in uint32_t
//------------------------------------------------------------------------------
typedef struct sha256_ctx_t
{
uint64_t len; // processed message length
uint32_t h[SHA256_DIGESTINT]; // hash state
uint8_t buf[SHA256_BLOCKLEN]; // message block buffer
} SHA256_CTX;
void sha256_init(SHA256_CTX *ctx);
void sha256_update(SHA256_CTX *ctx, const uint8_t *m, uint32_t mlen);
// resets state: calls sha256_init
void sha256_final(SHA256_CTX *ctx, uint8_t *md);
//------------------------------------------------------------------------------
typedef struct hmac_sha256_ctx_t
{
uint8_t buf[SHA256_BLOCKLEN]; // key block buffer, not needed after init
uint32_t h_inner[SHA256_DIGESTINT];
uint32_t h_outer[SHA256_DIGESTINT];
SHA256_CTX sha;
} HMAC_SHA256_CTX;
void hmac_sha256_init(HMAC_SHA256_CTX *hmac, const uint8_t *key, uint32_t keylen);
void hmac_sha256_update(HMAC_SHA256_CTX *hmac, const uint8_t *m, uint32_t mlen);
// resets state to hmac_sha256_init
void hmac_sha256_final(HMAC_SHA256_CTX *hmac, uint8_t *md);
//------------------------------------------------------------------------------
void pbkdf2_sha256(HMAC_SHA256_CTX *ctx,
const uint8_t *key, uint32_t keylen, const uint8_t *salt, uint32_t saltlen, uint32_t rounds,
uint8_t *dk, uint32_t dklen);
//------------------------------------------------------------------------------
#include <string.h>
//#define ROR(n,k) ((n >> k) | (n << (32 - k)))
static uint32_t ror(uint32_t n, uint32_t k)
{
return (n >> k) | (n << (32 - k));
}
#define ROR(n,k) ror(n,k)
#define CH(x,y,z) (z ^ (x & (y ^ z)))
#define MAJ(x,y,z) ((x & y) | (z & (x | y)))
#define S0(x) (ROR(x, 2) ^ ROR(x,13) ^ ROR(x,22))
#define S1(x) (ROR(x, 6) ^ ROR(x,11) ^ ROR(x,25))
#define R0(x) (ROR(x, 7) ^ ROR(x,18) ^ (x>>3))
#define R1(x) (ROR(x,17) ^ ROR(x,19) ^ (x>>10))
static const uint32_t K[64] =
{
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
static void sha256_transform(SHA256_CTX *s, const uint8_t *buf)
{
uint32_t t1, t2, a, b, c, d, e, f, g, h, m[64];
uint32_t i, j;
for (i = 0, j = 0; i < 16; i++, j += 4)
{
m[i] = (uint32_t) buf[j] << 24 | (uint32_t) buf[j + 1] << 16 |
(uint32_t) buf[j + 2] << 8 | (uint32_t) buf[j + 3];
}
for (; i < 64; i++)
{
m[i] = R1(m[i - 2]) + m[i - 7] + R0(m[i - 15]) + m[i - 16];
}
a = s->h[0];
b = s->h[1];
c = s->h[2];
d = s->h[3];
e = s->h[4];
f = s->h[5];
g = s->h[6];
h = s->h[7];
for (i = 0; i < 64; i++)
{
t1 = h + S1(e) + CH(e, f, g) + K[i] + m[i];
t2 = S0(a) + MAJ(a, b, c);
h = g;
g = f;
f = e;
e = d + t1;
d = c;
c = b;
b = a;
a = t1 + t2;
}
s->h[0] += a;
s->h[1] += b;
s->h[2] += c;
s->h[3] += d;
s->h[4] += e;
s->h[5] += f;
s->h[6] += g;
s->h[7] += h;
}
void sha256_init(SHA256_CTX *s)
{
s->len = 0;
s->h[0] = 0x6a09e667;
s->h[1] = 0xbb67ae85;
s->h[2] = 0x3c6ef372;
s->h[3] = 0xa54ff53a;
s->h[4] = 0x510e527f;
s->h[5] = 0x9b05688c;
s->h[6] = 0x1f83d9ab;
s->h[7] = 0x5be0cd19;
}
void sha256_final(SHA256_CTX *s, uint8_t *md)
{
uint32_t r = s->len % SHA256_BLOCKLEN;
int i;
//pad
s->buf[r++] = 0x80;
if (r > 56)
{
memset(s->buf + r, 0, SHA256_BLOCKLEN - r);
r = 0;
sha256_transform(s, s->buf);
}
memset(s->buf + r, 0, 56 - r);
s->len *= 8;
s->buf[56] = s->len >> 56;
s->buf[57] = s->len >> 48;
s->buf[58] = s->len >> 40;
s->buf[59] = s->len >> 32;
s->buf[60] = s->len >> 24;
s->buf[61] = s->len >> 16;
s->buf[62] = s->len >> 8;
s->buf[63] = s->len;
sha256_transform(s, s->buf);
for (i = 0; i < SHA256_DIGESTINT; i++)
{
md[4 * i ] = s->h[i] >> 24;
md[4 * i + 1] = s->h[i] >> 16;
md[4 * i + 2] = s->h[i] >> 8;
md[4 * i + 3] = s->h[i];
}
sha256_init(s);
}
void sha256_update(SHA256_CTX *s, const uint8_t *m, uint32_t len)
{
const uint8_t *p = m;
uint32_t r = s->len % SHA256_BLOCKLEN;
s->len += len;
if (r)
{
if (len + r < SHA256_BLOCKLEN)
{
memcpy(s->buf + r, p, len);
return;
}
memcpy(s->buf + r, p, SHA256_BLOCKLEN - r);
len -= SHA256_BLOCKLEN - r;
p += SHA256_BLOCKLEN - r;
sha256_transform(s, s->buf);
}
for (; len >= SHA256_BLOCKLEN; len -= SHA256_BLOCKLEN, p += SHA256_BLOCKLEN)
{
sha256_transform(s, p);
}
memcpy(s->buf, p, len);
}
#define INNER_PAD '\x36'
#define OUTER_PAD '\x5c'
void hmac_sha256_init(HMAC_SHA256_CTX *hmac, const uint8_t *key, uint32_t keylen)
{
SHA256_CTX *sha = &hmac->sha;
uint32_t i;
if (keylen <= SHA256_BLOCKLEN)
{
memcpy(hmac->buf, key, keylen);
memset(hmac->buf + keylen, '\0', SHA256_BLOCKLEN - keylen);
}
else
{
sha256_init(sha);
sha256_update(sha, key, keylen);
sha256_final(sha, hmac->buf);
memset(hmac->buf + SHA256_DIGESTLEN, '\0', SHA256_BLOCKLEN - SHA256_DIGESTLEN);
}
for (i = 0; i < SHA256_BLOCKLEN; i++)
{
hmac->buf[ i ] = hmac->buf[ i ] ^ OUTER_PAD;
}
sha256_init(sha);
sha256_update(sha, hmac->buf, SHA256_BLOCKLEN);
// copy outer state
memcpy(hmac->h_outer, sha->h, SHA256_DIGESTLEN);
for (i = 0; i < SHA256_BLOCKLEN; i++)
{
hmac->buf[ i ] = (hmac->buf[ i ] ^ OUTER_PAD) ^ INNER_PAD;
}
sha256_init(sha);
sha256_update(sha, hmac->buf, SHA256_BLOCKLEN);
// copy inner state
memcpy(hmac->h_inner, sha->h, SHA256_DIGESTLEN);
}
void hmac_sha256_update(HMAC_SHA256_CTX *hmac, const uint8_t *m, uint32_t mlen)
{
sha256_update(&hmac->sha, m, mlen);
}
void hmac_sha256_final(HMAC_SHA256_CTX *hmac, uint8_t *md)
{
SHA256_CTX *sha = &hmac->sha;
sha256_final(sha, md);
// reset sha to outer state
memcpy(sha->h, hmac->h_outer, SHA256_DIGESTLEN);
sha->len = SHA256_BLOCKLEN;
sha256_update(sha, md, SHA256_DIGESTLEN);
sha256_final(sha, md); // md = D(outer || D(inner || msg))
// reset sha to inner state -> reset hmac
memcpy(sha->h, hmac->h_inner, SHA256_DIGESTLEN);
sha->len = SHA256_BLOCKLEN;
}
void pbkdf2_sha256(HMAC_SHA256_CTX *hmac,
const uint8_t *key, uint32_t keylen, const uint8_t *salt, uint32_t saltlen, uint32_t rounds,
uint8_t *dk, uint32_t dklen)
{
uint8_t *U;
uint8_t *T;
uint8_t count[4];
uint32_t i, j, k;
uint32_t len;
uint32_t hlen = SHA256_DIGESTLEN;
uint32_t l = dklen / hlen + ((dklen % hlen) ? 1 : 0);
uint32_t r = dklen - (l - 1) * hlen;
hmac_sha256_init(hmac, key, keylen);
U = hmac->buf;
T = dk;
len = hlen;
for (i = 1; i <= l; i++)
{
if (i == l) { len = r; }
count[0] = (i >> 24) & 0xFF;
count[1] = (i >> 16) & 0xFF;
count[2] = (i >> 8) & 0xFF;
count[3] = (i) & 0xFF;
hmac_sha256_update(hmac, salt, saltlen);
hmac_sha256_update(hmac, count, 4);
hmac_sha256_final(hmac, U);
memcpy(T, U, len);
for (j = 1; j < rounds; j++)
{
hmac_sha256_update(hmac, U, hlen);
hmac_sha256_final(hmac, U);
for (k = 0; k < len; k++)
{
T[k] ^= U[k];
}
}
T += len;
}
}
void compute_sha_ex(unsigned char* dest, const uint8_t *msg, uint32_t mlen)
{
uint8_t md[SHA256_DIGESTLEN] = {0};
SHA256_CTX sha;
sha256_init(&sha);
sha256_update(&sha, msg, mlen);
sha256_final(&sha, md);
memcpy(dest, md, SHA256_DIGESTLEN);
}
void compute_hmac_ex(unsigned char* dest, const uint8_t *key, uint32_t klen, const uint8_t *msg, uint32_t mlen)
{
uint8_t md[SHA256_DIGESTLEN] = {0};
HMAC_SHA256_CTX hmac;
hmac_sha256_init (&hmac, key, klen);
hmac_sha256_update(&hmac, msg, mlen);
hmac_sha256_final (&hmac, md);
#if 0 // hex value
memcpy(dest, md, SHA256_DIGESTLEN);
#else // string of hex value
for (int i = 0; i < SHA256_DIGESTLEN; i++)
{
sprintf(dest, "%s%02x", dest, md[i]);
}
#endif
}
// HMAC_SHA256.h
#ifndef _HMAC_SHA256_H
#define _HMAC_SHA256_H
#ifndef uint8_t
typedef unsigned char uint8_t;
#endif
#ifndef uint32_t
typedef unsigned int uint32_t;
#endif
void compute_hmac_ex(unsigned char* dest, const uint8_t *key, uint32_t klen, const uint8_t *msg, uint32_t mlen);
#endif
// HuaweiIotToken.c
// Andy 18676383370, [email protected]
// https://support.huaweicloud.com/api-iothub/iot_06_v5_3009.html
#include "HuaweiIotToken.h"
#include "HMAC_SHA256.h"
#include <stdio.h>
#include <string.h>
#define TIME_STAMP_LEN (10)
int TOKEN_GetDeviceId(const uchar *productId, const uchar *deviceCode, uchar *deviceId)
{
if ( !productId )
{
printf("[%s] input error: productId is NULL", __FUNCTION__);
return -10;
}
if ( !strlen(productId) )
{
printf("[%s] input error: productId is empty", __FUNCTION__);
return -11;
}
if ( !deviceCode )
{
printf("[%s] input error: deviceCode is NULL", __FUNCTION__);
return -20;
}
if ( !strlen(deviceCode) )
{
printf("[%s] input error: deviceCode is empty", __FUNCTION__);
return -21;
}
if ( !deviceId )
{
printf("[%s] input error: deviceId is NULL", __FUNCTION__);
return -30;
}
sprintf(deviceId, "%s_%s", productId, deviceCode);
return 0;
}
int TOKEN_GetClientId(const uchar *deviceId, const uchar *timeStamp, uchar *clientId)
{
const uchar DEVICE_ID_TYPE[1+1] = "0";
const uchar CIPHER_SIGN_TYPE[1+1] = "0";
if ( !deviceId )
{
printf("[%s] input error: productId is NULL", __FUNCTION__);
return -10;
}
if ( !strlen(deviceId) )
{
printf("[%s] input error: productId is empty", __FUNCTION__);
return -11;
}
if ( !timeStamp )
{
printf("[%s] input error: timeStamp is NULL", __FUNCTION__);
return -20;
}
if ( strlen(timeStamp) != TIME_STAMP_LEN )
{
printf("[%s] input error: timeStamp len %d", __FUNCTION__, strlen(timeStamp));
return -21;
}
if ( !clientId )
{
printf("[%s] input error: deviceCode is NULL", __FUNCTION__);
return -30;
}
sprintf(clientId, "%s_%s_%s_%s",
deviceId,
DEVICE_ID_TYPE,
CIPHER_SIGN_TYPE,
timeStamp);
return 0;
}
int TOKEN_GetPassword(const uchar *timeStamp, const uchar *deviceSecret, uchar *password)
{
if ( !timeStamp )
{
printf("[%s] input error: timeStamp is NULL", __FUNCTION__);
return -10;
}
if ( strlen(timeStamp) != TIME_STAMP_LEN )
{
printf("[%s] input error: timeStamp len %d", __FUNCTION__, strlen(timeStamp));
return -11;
}
if ( !deviceSecret )
{
printf("[%s] input error: deviceSecret is NULL", __FUNCTION__);
return -20;
}
if ( !strlen(deviceSecret) )
{
printf("[%s] input error: deviceSecret is empty", __FUNCTION__);
return -21;
}
if ( !password )
{
printf("[%s] input error: password is NULL", __FUNCTION__);
return -30;
}
compute_hmac_ex( password,
timeStamp,
strlen(timeStamp),
deviceSecret,
strlen(deviceSecret) );
return 0;
}
// HuaweiIotToken.h
#ifndef _HUAWEI_IOT_TOKEN_H
#define _HUAWEI_IOT_TOKEN_H
#ifndef uchar
typedef unsigned char uchar;
#endif
int TOKEN_GetDeviceId(const uchar *productId, const uchar *deviceCode, uchar *deviceId);
int TOKEN_GetClientId(const uchar *deviceId, const uchar *timeStamp, uchar *clientId);
int TOKEN_GetPassword(const uchar *timeStamp, const uchar *deviceSecret, uchar *password);
#endif
// test.c
#include "HuaweiIotToken.h"
#include <stdio.h>
#define MAX_STR_LEN (256)
#define CLIENT_ID_LEN (256)
#define USERNAME_LEN (256)
#define PASSWORD_LEN (256)
#define PRODUCT_ID "myProductId"
#define IMEI "864424044187240"
#define DEVICE_SECRET "12345678"
#define DEVICE_REG_TIME_STAMP "2021031803"
int main(int argc,char **argv)
{
int ret = 0;
uchar deviceId[MAX_STR_LEN + 1] = {0};
ret = TOKEN_GetDeviceId(PRODUCT_ID, IMEI, deviceId);
if ( ret ) return -1;
printf("product id : %s\n", PRODUCT_ID);
printf("device code : %s\n", IMEI);
printf("device id : %s\n", deviceId);
printf("\n");
uchar clientId[CLIENT_ID_LEN + 1] = {0};
ret = TOKEN_GetClientId(deviceId, DEVICE_REG_TIME_STAMP, clientId);
if ( ret ) return -2;
printf("device id : %s\n", deviceId);
printf("time stamp : %s\n", DEVICE_REG_TIME_STAMP);
printf("client id : %s\n", clientId);
printf("\n");
uchar password[PASSWORD_LEN + 1] = {0};
ret = TOKEN_GetPassword(DEVICE_REG_TIME_STAMP, DEVICE_SECRET, password);
if ( ret ) return -3;
printf("timeStamp : %s\n", DEVICE_REG_TIME_STAMP);
printf("deviceSecret: %s\n", DEVICE_SECRET);
printf("password : %s\n", password);
printf("\n");
return 0;
}
編譯，運作。。。
生成的password完全一緻，歐耶~
d52820682c39ed6875c351ddcc1329580de6edd6c9056e6b8190342222f62af1