You can encrypt uploaded objects in the following ways.
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.
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;
}
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.
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.
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;
}
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