tencent cloud

PrevNext

Feedback

search by keyword

Recent Pages

Documentation
Cloud Object Storage
    Documentation
    Download PDF

    Server-Side Encryption

    Last updated: 2024-02-01 18:01:21
    Download PDF

      Overview

      You can encrypt uploaded objects in the following ways.

      Using SSE-COS Encryption

      Description

      With this method, your master key and data are managed by COS. COS can automatically encrypt your data when written into the IDC and automatically decrypt it when accessed. Currently, COS supports AES-256 encryption using a COS master key pair.
      In the C SDK, you need to configure the encryption by specifying the x-cos-server-side-encryption header.

      Sample

      int main(int argc, char *argv[])
      {
          cos_pool_t *p = NULL;
          int is_cname = 0;
          cos_status_t *s = NULL;
          cos_request_options_t *options = NULL;
          cos_string_t bucket;
          cos_string_t object;
          cos_table_t *resp_headers = NULL;
          cos_table_t *headers = NULL;
          cos_string_t file;
          cos_string_t download_file;
          // Initialize
          if (cos_http_io_initialize(NULL, 0) != COSE_OK) {
             exit(1);
          }
          cos_pool_create(&p, NULL);
          // Initialize the request options
          options = cos_request_options_create(p);
          options->config = cos_config_create(options->pool);
          cos_str_set(&options->config->endpoint, "cos.ap-guangzhou.myqcloud.com"); // Your endpoint
          cos_str_set(&options->config->access_key_id, "SECRETID");// Your SecretId 
          cos_str_set(&options->config->access_key_secret, "SECRETKEY"); // Your SecretKey
          cos_str_set(&options->config->appid, "APPID");// Your APPID
          options->config->is_cname = is_cname;
          options->ctl = cos_http_controller_create(options->pool, 0);
          cos_str_set(&bucket, "<BucketName-APPID>");// Your bucket name in the format: BucketName-APPID
      
          // Set headers for server-side SSE-COS encryption
          headers = cos_table_make(p, 1);
          apr_table_add(headers, "x-cos-server-side-encryption", "AES256");
      
          cos_str_set(&file, "example1.txt");// Your filename
          cos_str_set(&object, "example_object");// Your object name
      
          // Upload an object
          s = cos_put_object_from_file(options, &bucket, &object, &file, headers, &resp_headers);
          if (cos_status_is_ok(s)) {
              printf("put object succeeded\\n");
          } else {
              printf("put object failed\\n");
          }
      
          // Download an object
          cos_str_set(&download_file, "example2.txt");
          s = cos_get_object_to_file(options, &bucket, &object, NULL, NULL, &download_file, &resp_headers);
          if (cos_status_is_ok(s)) {
              printf("get object succeeded\\n");
          } else {
              printf("get object failed\\n");
          }
      
          cos_pool_destroy(p);
      
          cos_http_io_deinitialize();
          return 0;
      }

      Using SSE-C Encryption

      The encryption key is provided by the customer. When you upload an object, COS will apply AES-256 encryption to your data using the customer-provided encryption key pair. In the C SDK, you need to configure the encryption by specifying the x-cos-server-side-encryption-customer-* header.

      Description

      Note:
      This type of encryption requires using HTTPS requests.
      customerKey: the key provided by the user; this key should be a 32-byte string consisting of numbers, letters, and symbols. Chinese characters are not supported.
      If this encryption method was used when you uploaded the source file, you should also use it when you GET (download) or HEAD (query) this file.

      Sample

      int main(int argc, char *argv[])
      {
          cos_pool_t *p = NULL;
          int is_cname = 0;
          cos_status_t *s = NULL;
          cos_request_options_t *options = NULL;
          cos_string_t bucket;
          cos_string_t object;
          cos_table_t *resp_headers = NULL;
          cos_table_t *headers = NULL;
          cos_string_t file;
          cos_string_t download_file;
          // Initialize
          if (cos_http_io_initialize(NULL, 0) != COSE_OK) {
             exit(1);
          }
          cos_pool_create(&p, NULL);
          // Initialize the request options
          options = cos_request_options_create(p);
          options->config = cos_config_create(options->pool);
          cos_str_set(&options->config->endpoint, "https://cos.ap-guangzhou.myqcloud.com"); // Your endpoint, which requires requests to be sent over HTTPS
          cos_str_set(&options->config->access_key_id, "SECRETID");// Your SecretId 
          cos_str_set(&options->config->access_key_secret, "SECRETKEY"); // Your SecretKey
          cos_str_set(&options->config->appid, "APPID");// Your APPID
          options->config->is_cname = is_cname;
          options->ctl = cos_http_controller_create(options->pool, 0);
          cos_str_set(&bucket, "<BucketName-APPID>");// Your bucket name in the format: BucketName-APPID
      
          // Set headers for SSE-C encryption
          headers = cos_table_make(p, 3);
          apr_table_add(headers, "x-cos-server-side-encryption-customer-algorithm", "AES256");
          apr_table_add(headers, "x-cos-server-side-encryption-customer-key", "MDEyMzQ1Njc4OUFCQ0RFRjAxMjM0NTY3ODlBQkNERUY=");// Replace with your own Base64-encoded server-side encryption key
          apr_table_add(headers, "x-cos-server-side-encryption-customer-key-MD5", "U5L61r7jcwdNvT7frmUG8g==");// Replace with the Base64-encoded MD5 hash of your own server-side encryption key
      
          cos_str_set(&file, "example1.txt");// Your file name
          cos_str_set(&object, "example_object");// Your object name
      
          // Upload an object
          s = cos_put_object_from_file(options, &bucket, &object, &file, headers, &resp_headers);
          if (cos_status_is_ok(s)) {
              printf("put object succeeded\\n");
          } else {
              printf("put object failed\\n");
          }
      
          // Download an object, which also requires the headers for server-side encryption
          cos_str_set(&download_file, "example2.txt");
          s = cos_get_object_to_file(options, &bucket, &object, headers, NULL, &download_file, &resp_headers);
          if (cos_status_is_ok(s)) {
              printf("get object succeeded\\n");
          } else {
              printf("get object failed\\n");
          }
      
          cos_pool_destroy(p);
      
          cos_http_io_deinitialize();
          return 0;
      }
      Contact Us

      Contact our sales team or business advisors to help your business.

      Contact Us
      Technical Support

      Open a ticket if you're looking for further assistance. Our Ticket is 7x24 avaliable.

      Submit a Ticket
      7x24 Phone Support
      Copyright © 2013-2024 Tencent Cloud. All Rights Reserved.
      Privacy PolicyLegalCookie Policy