/*
 * 2021.03.16 created by unicom.YouHong
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>

#define PRODUCTKEY_MAXLEN           (16)
#define DEVICEKEY_MAXLEN            (32)
#define DEVICESECRET_MAXLEN         (32)

#define DEVICE_SECRETE_MAXLEN       (100)
#define PASSWORD_MAXLEN             (65)

#define KEY_IOPAD_SIZE          (64)
#define SHA256_DIGEST_SIZE      (32)


static const unsigned char cucc_sha256_padding[64] = {
    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

static const uint32_t K[] = {
    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,
};

#define SHR(x,n)  ((x & 0xFFFFFFFF) >> n)
#define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))

#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^  SHR(x, 3))
#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^  SHR(x,10))

#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))

#define F0(x,y,z) ((x & y) | (z & (x | y)))
#define F1(x,y,z) (z ^ (x & (y ^ z)))

#define R(t)                                        \
    (                                               \
            W[t] = S1(W[t -  2]) + W[t -  7] +      \
                   S0(W[t - 15]) + W[t - 16]        \
    )

#define P(a,b,c,d,e,f,g,h,x,K)                      \
    {                                               \
        temp1 = h + S3(e) + F1(e,f,g) + K + x;      \
        temp2 = S2(a) + F0(a,b,c);                  \
        d += temp1; h = temp1 + temp2;              \
    }

typedef struct {
    uint32_t total[2];         
    uint32_t state[8];          
    unsigned char buffer[64];   
    int is224;                  
} sha256_context;

typedef union {
    char sptr[8];
    uint64_t lint;
} u_retLen;


#ifndef CUCC_GET_UINT32_BE
#define CUCC_GET_UINT32_BE(n,b,i)                                \
    do {                                                    \
        (n) = ( (uint32_t) (b)[(i)    ] << 24 )             \
              | ( (uint32_t) (b)[(i) + 1] << 16 )           \
              | ( (uint32_t) (b)[(i) + 2] <<  8 )           \
              | ( (uint32_t) (b)[(i) + 3]       );          \
    } while( 0 )
#endif

#ifndef CUCC_PUT_UINT32_BE
#define CUCC_PUT_UINT32_BE(n,b,i)                                \
    do {                                                    \
        (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
        (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
        (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
        (b)[(i) + 3] = (unsigned char) ( (n)       );       \
    } while( 0 )
#endif

static void cuccHex2str(uint8_t *input, uint16_t input_len, char *output)
{
    char *zEncode = "0123456789abcdef";
    int i = 0, j = 0;
    for (i = 0; i < input_len; i++) {
        output[j++] = zEncode[(input[i] >> 4) & 0xf];
        output[j++] = zEncode[(input[i]) & 0xf];
    }
}

static void cuccSha256_zeroize(void *v, uint32_t n)
{
    volatile unsigned char *p = v;
    while (n--) {
        *p++ = 0;
    }
}

void cuccSha256_init(sha256_context *ctx)
{
    memset(ctx, 0, sizeof(sha256_context));
}

void cuccSha256_free(sha256_context *ctx)
{
    if (NULL == ctx) {
        return;
    }

    cuccSha256_zeroize(ctx, sizeof(sha256_context));
}

void cuccSha256_starts(sha256_context *ctx)
{
    int is224 = 0;
    ctx->total[0] = 0;
    ctx->total[1] = 0;

    if (is224 == 0) {
        ctx->state[0] = 0x6A09E667;
        ctx->state[1] = 0xBB67AE85;
        ctx->state[2] = 0x3C6EF372;
        ctx->state[3] = 0xA54FF53A;
        ctx->state[4] = 0x510E527F;
        ctx->state[5] = 0x9B05688C;
        ctx->state[6] = 0x1F83D9AB;
        ctx->state[7] = 0x5BE0CD19;
    }

    ctx->is224 = is224;
}

void cuccSha256_process(sha256_context *ctx, const unsigned char data[64])
{
    uint32_t temp1, temp2, W[64];
    uint32_t A[8];
    unsigned int i;

    for (i = 0; i < 8; i++) {
        A[i] = ctx->state[i];
    }

    for (i = 0; i < 64; i++) {
        if (i < 16) {
            CUCC_GET_UINT32_BE(W[i], data, 4 * i);
        } else {
            R(i);
        }

        P(A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i]);

        temp1 = A[7];
        A[7] = A[6];
        A[6] = A[5];
        A[5] = A[4];
        A[4] = A[3];
        A[3] = A[2];
        A[2] = A[1];
        A[1] = A[0];
        A[0] = temp1;
    }

    for (i = 0; i < 8; i++) {
        ctx->state[i] += A[i];
    }
}
void cuccSha256_update(sha256_context *ctx, const unsigned char *input, uint32_t ilen)
{
    size_t fill;
    uint32_t left;

    if (ilen == 0) {
        return;
    }

    left = ctx->total[0] & 0x3F;
    fill = 64 - left;

    ctx->total[0] += (uint32_t) ilen;
    ctx->total[0] &= 0xFFFFFFFF;

    if (ctx->total[0] < (uint32_t) ilen) {
        ctx->total[1]++;
    }

    if (left && ilen >= fill) {
        memcpy((void *)(ctx->buffer + left), input, fill);
        cuccSha256_process(ctx, ctx->buffer);
        input += fill;
        ilen  -= fill;
        left = 0;
    }

    while (ilen >= 64) {
        cuccSha256_process(ctx, input);
        input += 64;
        ilen  -= 64;
    }

    if (ilen > 0) {
        memcpy((void *)(ctx->buffer + left), input, ilen);
    }
}

void cuccSha256_finish(sha256_context *ctx, uint8_t output[32])
{
    uint32_t last, padn;
    uint32_t high, low;
    unsigned char msglen[8];

    high = (ctx->total[0] >> 29)
           | (ctx->total[1] <<  3);
    low  = (ctx->total[0] <<  3);

    CUCC_PUT_UINT32_BE(high, msglen, 0);
    CUCC_PUT_UINT32_BE(low,  msglen, 4);

    last = ctx->total[0] & 0x3F;
    padn = (last < 56) ? (56 - last) : (120 - last);

    cuccSha256_update(ctx, cucc_sha256_padding, padn);
    cuccSha256_update(ctx, msglen, 8);

    CUCC_PUT_UINT32_BE(ctx->state[0], output,  0);
    CUCC_PUT_UINT32_BE(ctx->state[1], output,  4);
    CUCC_PUT_UINT32_BE(ctx->state[2], output,  8);
    CUCC_PUT_UINT32_BE(ctx->state[3], output, 12);
    CUCC_PUT_UINT32_BE(ctx->state[4], output, 16);
    CUCC_PUT_UINT32_BE(ctx->state[5], output, 20);
    CUCC_PUT_UINT32_BE(ctx->state[6], output, 24);

    if (ctx->is224 == 0) {
        CUCC_PUT_UINT32_BE(ctx->state[7], output, 28);
    }
}

static void cuccHmac_sha256(const uint8_t *msg, uint32_t msg_len, const uint8_t *key, uint32_t key_len, uint8_t output[32])
{
    sha256_context ctx;
    uint8_t k_ipad[KEY_IOPAD_SIZE];   
    uint8_t k_opad[KEY_IOPAD_SIZE];    
    int32_t i;

    if ((NULL == msg) || (NULL == key) || (NULL == output)) {
        return;
    }

    if (key_len > KEY_IOPAD_SIZE) {
        return;
    }

    memset(k_ipad, 0, sizeof(k_ipad));
    memset(k_opad, 0, sizeof(k_opad));
    memcpy(k_ipad, key, key_len);
    memcpy(k_opad, key, key_len);

    for (i = 0; i < KEY_IOPAD_SIZE; i++) {
        k_ipad[i] ^= 0x36;
        k_opad[i] ^= 0x5c;
    }

    cuccSha256_init(&ctx);                                    
    cuccSha256_starts(&ctx);                                    
    cuccSha256_update(&ctx, k_ipad, KEY_IOPAD_SIZE);     
    cuccSha256_update(&ctx, msg, msg_len);                      
    cuccSha256_finish(&ctx, output);                            

    cuccSha256_init(&ctx);                              
    cuccSha256_starts(&ctx);                            
    cuccSha256_update(&ctx, k_opad, KEY_IOPAD_SIZE);    
    cuccSha256_update(&ctx, output, SHA256_DIGEST_SIZE);     
    cuccSha256_finish(&ctx, output);                      
}

#define MQTT_CUCC_REGISTER_INTERFACE
int mqttCuccNoPreIdentity(const char *productKey, const char *InDeviceId, const char *deviceKey, char *clientId, char *username)
{    
    if (productKey == NULL || deviceKey == NULL ||
        clientId == NULL || username == NULL ) 
    {
      return -1;
    }
    if ((strlen(productKey) > PRODUCTKEY_MAXLEN) ||
        (strlen(deviceKey) > DEVICEKEY_MAXLEN)) 
    {
      return -1;
    }
    
    memcpy(clientId, InDeviceId, strlen(InDeviceId));
    memcpy(clientId + strlen(clientId), "|", 1);
    memcpy(clientId + strlen(clientId), productKey, strlen(productKey));
    memcpy(clientId + strlen(clientId), "|0|-2|0", 7);
    //memset(clientId + strlen(deviceId) + strlen(productKey) + 8, 0, 1);
    memcpy(username, deviceKey, strlen(deviceKey));
    memcpy(username + strlen(username), "|", 1);
    memcpy(username + strlen(username), productKey, strlen(productKey));
    //memset(username + strlen(deviceKey) + strlen(productKey) + 1, 0, 1);
    return 0;
}

int mqttCuccDynNoPreRegIdentity(const char *productKey, const char *InDeviceId, const char *deviceKey, const char *productSecret, char *clientId, char *username, char *password)
{
  char DEVICE_SECRET[DEVICE_SECRETE_MAXLEN] = {0};
  uint8_t Res[32] = {0};
  //int res;

  if (productKey == NULL || deviceKey == NULL || productSecret == NULL ||
      clientId == NULL || username == NULL || password == NULL) {
    return -1;
  }
  if ((strlen(productKey) > PRODUCTKEY_MAXLEN) ||
      (strlen(deviceKey) > DEVICEKEY_MAXLEN) ||
      (strlen(productSecret) > DEVICESECRET_MAXLEN)) {
    return -1;
  }

  //memcpy(deviceId, productKey, strlen(productKey));
  //memcpy(deviceId + strlen(deviceId), deviceKey, strlen(deviceKey));
  memcpy(clientId, InDeviceId, strlen(InDeviceId));
  memcpy(clientId + strlen(clientId), "|", 1);
  memcpy(clientId + strlen(clientId), productKey, strlen(productKey));
  memcpy(clientId + strlen(clientId), "|0|2|0", 6);
  //memset(clientId + strlen(deviceId) + strlen(productKey) + 7, 0, 1);
  memcpy(username, deviceKey, strlen(deviceKey));
  memcpy(username + strlen(username), "|", 1);
  memcpy(username + strlen(username), productKey, strlen(productKey));
  //memset(username + strlen(deviceKey) + strlen(productKey) + 1, 0, 1);
  memcpy(DEVICE_SECRET + strlen(DEVICE_SECRET), InDeviceId, strlen(InDeviceId));
  memcpy(DEVICE_SECRET + strlen(DEVICE_SECRET), deviceKey, strlen(deviceKey));
  memcpy(DEVICE_SECRET + strlen(DEVICE_SECRET), productKey, strlen(productKey));

  cuccHmac_sha256((uint8_t *)DEVICE_SECRET, strlen(DEVICE_SECRET),
              (uint8_t *)productSecret, strlen(productSecret), Res);

  memset(password, 0, PASSWORD_MAXLEN);
  cuccHex2str(Res, sizeof(Res), password);
  return 0;
}


int mqttCuccIdentity(const char *productKey, const char *deviceKey, const char *deviceSecret, char *clientId, char *username, char *password)
{
    char deviceId[PRODUCTKEY_MAXLEN + DEVICEKEY_MAXLEN + 1] = {0};
    char DEVICE_SECRET[DEVICE_SECRETE_MAXLEN] = {0};
    uint8_t Res[32] = {0};

    if (productKey == NULL || deviceKey == NULL || deviceSecret == NULL ||
        clientId == NULL || username == NULL || password == NULL) {
        return -1;
    }
    if ((strlen(productKey) > PRODUCTKEY_MAXLEN) || (strlen(deviceKey) > DEVICEKEY_MAXLEN) ||
        (strlen(deviceSecret) > DEVICESECRET_MAXLEN)) {
        return -1;
    }

    memcpy(deviceId, productKey, strlen(productKey));
    memcpy(deviceId + strlen(deviceId), deviceKey, strlen(deviceKey));
    memcpy(clientId, deviceId, strlen(deviceId));
    memcpy(clientId + strlen(clientId), "|", 1);
    memcpy(clientId + strlen(clientId), productKey, strlen(productKey));
    memcpy(clientId + strlen(clientId), "|0|0|0", 6);
    memset(clientId + strlen(deviceId) + strlen(productKey)+7, 0, 1);
    memcpy(username, deviceKey, strlen(deviceKey));
    memcpy(username+ strlen(username), "|", 1);
    memcpy(username+ strlen(username), productKey, strlen(productKey));
    memset(username + strlen(deviceKey)+ strlen(productKey)+1, 0, 1);
    memcpy(DEVICE_SECRET + strlen(DEVICE_SECRET), deviceId, strlen(deviceId));
    memcpy(DEVICE_SECRET + strlen(DEVICE_SECRET), deviceKey, strlen(deviceKey));
    memcpy(DEVICE_SECRET + strlen(DEVICE_SECRET), productKey, strlen(productKey));
    
    cuccHmac_sha256((uint8_t *)DEVICE_SECRET, strlen(DEVICE_SECRET), (uint8_t *)deviceSecret, strlen(deviceSecret), Res);

    memset(password, 0, PASSWORD_MAXLEN);
    cuccHex2str(Res, sizeof(Res), password);
    return 0;
}

int mqttCuccDynRegIdentity(const char *productKey, const char *deviceKey, const char *productSecret, char *clientId, char *username, char *password)
{
    char deviceId[PRODUCTKEY_MAXLEN + DEVICEKEY_MAXLEN + 1] = {0};
    char DEVICE_SECRET[DEVICE_SECRETE_MAXLEN] = {0};
    uint8_t Res[32] = {0};

    if (productKey == NULL || deviceKey == NULL || productSecret == NULL ||
        clientId == NULL || username == NULL || password == NULL) {
        return -1;
    }
    if ((strlen(productKey) > PRODUCTKEY_MAXLEN) || (strlen(deviceKey) > DEVICEKEY_MAXLEN) ||
        (strlen(productSecret) > DEVICESECRET_MAXLEN)) {
        return -1;
    }

    memcpy(deviceId, productKey, strlen(productKey));
    memcpy(deviceId + strlen(deviceId), deviceKey, strlen(deviceKey));
    memcpy(clientId, deviceId, strlen(deviceId));
    memcpy(clientId + strlen(clientId), "|", 1);
    memcpy(clientId + strlen(clientId), productKey, strlen(productKey));
    memcpy(clientId + strlen(clientId), "|0|1|0", 6);
    memset(clientId + strlen(deviceId) + strlen(productKey)+7, 0, 1);
    memcpy(username, deviceKey, strlen(deviceKey));
    memcpy(username+ strlen(username), "|", 1);
    memcpy(username+ strlen(username), productKey, strlen(productKey));
    memset(username + strlen(deviceKey)+ strlen(productKey)+1, 0, 1);
    memcpy(DEVICE_SECRET + strlen(DEVICE_SECRET), deviceId, strlen(deviceId));
    memcpy(DEVICE_SECRET + strlen(DEVICE_SECRET), deviceKey, strlen(deviceKey));
    memcpy(DEVICE_SECRET + strlen(DEVICE_SECRET), productKey, strlen(productKey));
    
    cuccHmac_sha256((uint8_t *)DEVICE_SECRET, strlen(DEVICE_SECRET), (uint8_t *)productSecret, strlen(productSecret), Res);

    memset(password, 0, PASSWORD_MAXLEN);
    cuccHex2str(Res, sizeof(Res), password);
    return 0;
}