C++ MD5_Init函数代码示例

// we can only get md5 of an object containing 1 range
// XXX: move code to separate thread
gboolean cache_mng_get_md5 (CacheMng *cmng, fuse_ino_t ino, gchar **md5str)
{
    struct _CacheEntry *entry;
    unsigned char digest[MD5_DIGEST_LENGTH];
    MD5_CTX md5ctx;
    ssize_t bytes;
    unsigned char data[1024];
    char path[PATH_MAX];
    size_t i;
    gchar *out;
    FILE *in;

    entry = g_hash_table_lookup (cmng->h_entries, GUINT_TO_POINTER (ino));
    if (!entry)
        return FALSE;
    
    if (range_count (entry->avail_range) != 1) {
        LOG_debug (CMNG_LOG, INO_H"Entry contains more than 1 range, can't take MD5 sum of such object !", INO_T (ino));
        return FALSE;
    }

    cache_mng_file_name (cmng, path, sizeof (path), ino);
    in = fopen (path, "rb");
    if (in == NULL) {
        LOG_debug (CMNG_LOG, INO_H"Can't open file for reading: %s", INO_T (ino), path);
        return FALSE;
    }

    MD5_Init (&md5ctx);
    while ((bytes = fread (data, 1, 1024, in)) != 0)
        MD5_Update (&md5ctx, data, bytes);
    MD5_Final (digest, &md5ctx);
    fclose (in);

    out = g_malloc (33);
    for (i = 0; i < 16; ++i)
        sprintf (&out[i*2], "%02x", (unsigned int)digest[i]);

    *md5str = out;

    return TRUE;
}

static int lua_util_md5(lua_State* L)
{
    const char* path=lua_tostring(L,1);
    if(!path)
        lua_pushnil(L);
    else
    {
        FILE* fp=fopen(path,"rb");
        if(!fp)
            lua_pushnil(L);
        else
        {
            MD5_CTX ctx;
            MD5_Init(&ctx);

            {
                char tmp[512];
                size_t n;
                while((n=fread(tmp,1,sizeof(tmp),fp))>0)
                    MD5_Update(&ctx,(unsigned char*)tmp,n);
            }

            fclose(fp);

            unsigned char tmp[16];
            MD5_Final(tmp,&ctx);

            char buf[sizeof(tmp)*2];

            static const char hex[]="0123456789abcdef";
            for(int i=0,j=0;i<sizeof(tmp);i++)
            {
                buf[j++]=hex[(tmp[i]>>4)&0x0f];
                buf[j++]=hex[tmp[i]&0x0f];
            }

            lua_pushlstring(L,buf,sizeof(buf));
        }
    }

    return 1;
}

static int get_part_cksum(struct file *f, FILE **fp)
{
	MD5_CTX md5;
	int got=0;
	static char buf[PART_CHUNK];
	unsigned char checksum[MD5_DIGEST_LENGTH+1];

	if(*fp) fseek(*fp, 0, SEEK_SET);
	else if(!(*fp=open_file(f)))
	{
		f->part_cksum=0;
		return 0;
	}

	if(!MD5_Init(&md5))
	{
		logp("MD5_Init() failed\n");
		return -1;
	}

	got=fread(buf, 1, PART_CHUNK, *fp);

	if(!MD5_Update(&md5, buf, got))
	{
		logp("MD5_Update() failed\n");
		return -1;
	}

	if(!MD5_Final(checksum, &md5))
	{
		logp("MD5_Final() failed\n");
		return -1;
	}

	memcpy(&(f->part_cksum), checksum, sizeof(unsigned));

	// Try for a bit of efficiency - no need to calculate the full checksum
	// again if we already read the whole file.
	if(got<PART_CHUNK) f->full_cksum=f->part_cksum;

	return 0;
}

void calc_hash(const char *filename)
{
    int n;
    unsigned char data[BUFFSIZE];
    FILE *file = fopen(filename, "rb");
    if (file == NULL) {
        fprintf(stderr, "'%s' ", filename);
        perror("文件打开失败");
        return;
    }

    unsigned char md5[MD5_DIGEST_LENGTH];
    MD5_CTX md5_c;
    unsigned char sha1[SHA_DIGEST_LENGTH];
    SHA_CTX sha1_c;
    unsigned char sha512[SHA_DIGEST_LENGTH];
    SHA512_CTX sha512_c;

    MD5_Init(&md5_c);
    SHA1_Init(&sha1_c);
    SHA512_Init(&sha512_c);
    while ((n = fread(data, 1, BUFFSIZE, file)) != 0) {
        MD5_Update(&md5_c, data, n);
        SHA1_Update(&sha1_c, data, n);
        SHA512_Update(&sha512_c, data, n);
    }
    MD5_Final(md5, &md5_c);
    SHA1_Final(sha1, &sha1_c);
    SHA512_Final(sha512, &sha512_c);

    int i;
    printf("%s", filename);
    printf("\n%8s: ", "MD5");
    for (i = 0; i < MD5_DIGEST_LENGTH; i++) printf("%02x", md5[i]);
    printf("\n%8s: ", "SHA1");
    for (i = 0; i < SHA_DIGEST_LENGTH; i++) printf("%02x", sha1[i]);
    printf("\n%8s: ", "SHA512");
    for (i = 0; i < SHA_DIGEST_LENGTH; i++) printf("%02x", sha512[i]);
    printf("\n");

    fclose(file);
}

		int32_t do_update(const std::string& _file, const std::string& _md5, const update_params& _params)
		{
			http_request_simple request(core::proxy_settings(), _params.is_stoped_);
			request.set_url(get_update_server() + _file);
            request.set_need_log(false);
			if (!request.get())
				return -1;

			int32_t http_code = (uint32_t)request.get_response_code();
			if (http_code != 200)
				return -1;

			auto response = request.get_response();

			if (!response->available())
				return -1;

			int32_t size = response->available();

			MD5_CTX md5handler;
			unsigned char md5digest[MD5_DIGEST_LENGTH];

			MD5_Init(&md5handler);
			MD5_Update(&md5handler, response->read(size), size);
			MD5_Final(md5digest,&md5handler);

			char buffer[100];
			std::string md5;

			for (int32_t i = 0; i < MD5_DIGEST_LENGTH; i++)
			{
				sprintf(buffer, "%02x", md5digest[i]);
				md5 += buffer;
			}
		
			if (md5 != _md5)
				return -1;

			response->reset_out();

			return run_installer(*response);
		}

/* Get the next rsync block of a file. */
int
rsync_nextblock(struct rsyncfile *rf)
{
	MD5_CTX ctx;
	size_t blocksize;

	if (rf->blockptr >= rf->end)
		return (0);
	blocksize = min((size_t)(rf->end - rf->blockptr), rf->blocksize);
	/* Calculate MD5 of the block. */
	MD5_Init(&ctx);
	MD5_Update(&ctx, rf->blockptr, blocksize);
	MD5_End(rf->blockmd5, &ctx);

	rf->rsum = rsync_rollsum(rf->blockptr, blocksize);
	snprintf(rf->rsumstr, RSUM_SIZE, "%x", rf->rsum);
	rf->blocknum++;
	rf->blockptr += blocksize;
	return (1);
}

std::string tc_digest(
	const char *algo,
	const char *ibytes,
	uint32_t nibytes)
{
	std::string ret("");
	if (algo && !strcmp(algo, "md5")) {
		uint8_t obytes[MD5_DIGEST_LENGTH];
		memset(obytes, 0, MD5_DIGEST_LENGTH);
		MD5_CTX ctx;
		MD5_Init(&ctx);
		MD5_Update(&ctx, ibytes, nibytes);
		MD5_Final(obytes, &ctx);
		char ret_cstr[2*MD5_DIGEST_LENGTH+1];
		for(uint32_t i=0; i < MD5_DIGEST_LENGTH; i++)
			sprintf(ret_cstr+2*i, "%02x", obytes[i]);
		ret = ret_cstr;
	}
	return ret;
}

void blob_set_path_hash(blob_t *blob, const uint8_t *data, size_t size)
{
    uint8_t hash[16];
    char path[256];
    char *p;

    MD5_CTX ctx;
    MD5_Init(&ctx);
    MD5_Update(&ctx, data, size);
    MD5_Final(hash, &ctx);

    strncpy(path, "crypto/", sizeof(path));
    p = strrchr(path, '/') + 1;
    for (size_t i = 0; i < sizeof(hash); i++) {
        snprintf(p, 3, "%02X", hash[i]);
        p += 2;
    }
    strncpy(p, ".bin", sizeof(path) - (p - &path[0]));
    blob_set_path(blob, path);
}

static int calculate_md5(char *str, const char *path) {
    FILE *fd;
    fd = fopen(path, "r");
    if (fd != NULL) {
        MD5_CTX c;
        size_t i;
        static unsigned char buf[BUFSIZE];
        unsigned char md5dig[MD5_DIGEST_LENGTH];
        MD5_Init(&c);
        while ((i = fread(buf, 1, BUFSIZE, fd)) > 0)
            MD5_Update(&c, buf, i);
        MD5_Final(&(md5dig[0]), &c);
        fclose(fd);
        to_md5_hash(str, md5dig);
    } else {
       return 1;
    }

    return 0;
}

static int lua_md5(lua_State* L)
{
    size_t l=0;

    const char* s=luaL_checklstring(L,1,&l);

    MD5_CTX ctx;
    MD5_Init(&ctx);
    MD5_Update(&ctx,(unsigned char*)s,l);

    unsigned char md[16];
    MD5_Final(md,&ctx);

    char buf[sizeof(md)*2];
    to_hex(md,buf,sizeof(md));
 
    lua_pushlstring(L,buf,sizeof(buf));

    return 1;
}

static char *md5_fd(int fd)
{
    MD5_CTX ctx;
    unsigned char buf[BUFSIZ], output[16];
    ssize_t n;

    MD5_Init(&ctx);

    while ((n = read(fd, buf, sizeof(buf))) > 0 || errno == EINTR) {
        if (n < 0)
            continue;
        MD5_Update(&ctx, buf, n);
    }

    if (n < 0)
        return NULL;

    MD5_Final(output, &ctx);
    return hex_representation(output, 16);
}

char * md5_identity(void *data, int len)
{
    unsigned char hash[16];
    char* result;
    int ptr,i;

    result = (char*)malloc(sizeof(char)*512);
    memset(result, 0, sizeof(result));
    MD5_CTX ctx;
    MD5_Init(&ctx);
    MD5_Update(&ctx,(char*)data,len);
    MD5_Final(hash,&ctx);

    ptr = 0;
    for(i=0;i<16;i++)
    {
        ptr += sprintf(result+ptr, "%02x", hash[i]);
    }
    return result;
}

string md5sum(const char * str, int len)
{
	int n;
    MD5_CTX ctx;
    char buf[SLICECAP];
    unsigned char out[MD5_DIGEST_LENGTH];
    string md5str;

	MD5_Init(&ctx);
	MD5_Update(&ctx, str, len);
    MD5_Final(out, &ctx);

    for(n = 0; n< MD5_DIGEST_LENGTH; n++)
	{
		snprintf(buf, SLICECAP, "%02x", out[n]);
		md5str += buf;
	}

    return md5str;     
}

// computes an RSA-MD5 signature over 'buf' using 'priv_key'
// signature data is returned is 'sig_buf' which should be at least
// SIGNATURE_LEN bytes in size.  
// Method returns 0 on success.   
int get_signature(char *buf, unsigned int buf_size, RSA *priv_key,
                   unsigned char *sig_buf, unsigned int *sig_len) {

  unsigned char digest[16];
  unsigned int digest_len = 16;
  MD5_CTX md5;
  MD5_Init(&md5);
  MD5_Update(&md5, (unsigned char*)buf, buf_size);
  MD5_Final(digest, &md5);

  int ret_val = RSA_sign(NID_md5, digest, digest_len, 
			sig_buf, sig_len, priv_key);
  if(!ret_val) {
      unsigned long e = ERR_get_error();
      DPRINTF(DEBUG_ERROR,"RSA_sign error: %s", ERR_error_string(e, buf));
      return 1;
  }
 
  return 0;
}

int main( int argc, char **argv )
{
    MD5_CTX ctx;
    unsigned char *data="123";
    unsigned char md[16];
    char buf[33]={'\0'};
    char tmp[3]={'\0'};
    int i;

    MD5_Init(&ctx);
    MD5_Update(&ctx,data,strlen(data));
    MD5_Final(md,&ctx);

    for( i=0; i<16; i++ ){
        sprintf(tmp,"%02X",md[i]);
        strcat(buf,tmp);
    }
    printf("%s\n",buf);
    return 0;
}