Objective-C

Azure Key Vault Get the Latest Version of a Certificate

See more Azure Key Vault Examples

Demonstrates how to get the latest version of a certificate in Azure Key Vault.

Note: This example requires Chilkat v9.5.0.96 or later.

Objective-C

#import <CkoJsonObject.h>
#import <CkoHttp.h>
#import <CkoStringBuilder.h>
#import <CkoCert.h>
#import <NSString.h>

BOOL success = NO;

//  This requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  See Azure Key Vault Get Certificates for a more detailed explanation
//  for how Chilkat is automatically getting the OAuth2 access token for your application.

//  Provide information needed for Chilkat to automatically get an OAuth2 access token as needed.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"client_id" value: @"APP_ID"];
[json UpdateString: @"client_secret" value: @"APP_PASSWORD"];
[json UpdateString: @"resource" value: @"https://vault.azure.net"];
[json UpdateString: @"token_endpoint" value: @"https://login.microsoftonline.com/TENANT_ID/oauth2/token"];

CkoHttp *http = [[CkoHttp alloc] init];

//  Instead of providing an actual access token, we give Chilkat the information that allows it to 
//  automatically fetch the access token using the OAuth2 client credentials flow.
http.AuthToken = [json Emit];

//  Replace VAULT_NAME with the name of your Azure Key Vault.
[http SetUrlVar: @"certName" value: @"importCert01"];

CkoStringBuilder *sbResponse = [[CkoStringBuilder alloc] init];
success = [http QuickGetSb: @"https://VAULT_NAME.vault.azure.net/certificates/{$certName}?api-version=7.4" sbContent: sbResponse];
if (success == NO) {

    int statusCode = [http.LastStatus intValue];
    if (statusCode == 0) {
        //  We did not get a response from the server..
        NSLog(@"%@",http.LastErrorText);
    }
    else {
        //  We received a response, but it was an error.
        NSLog(@"%@%d",@"Error response status code: ",statusCode);
        NSLog(@"%@",@"Error response:");
        NSLog(@"%@",[sbResponse GetAsString]);
    }

    return;
}

CkoJsonObject *jsonResp = [[CkoJsonObject alloc] init];
[jsonResp LoadSb: sbResponse];
jsonResp.EmitCompact = NO;

NSLog(@"%@",[jsonResp Emit]);

//  A sample JSON response is show at the bottom.

//  Let's do two things with the result.
//  1) Load the DER of the cert into a Chilkat Cert object.
//  2) Get the Key Vault version id of the certificate.

CkoCert *cert = [[CkoCert alloc] init];
success = [cert LoadFromBase64: [jsonResp StringOf: @"cer"]];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    NSLog(@"%@",@"Failed to load certificate from Base64 DER.");
    return;
}

//  The Azure Key Vault's "version" of the certificate is the hex string at the end of the "id", "kid", and "sid" JSON members.
//  For example:  "7140c8755ed14839b5d86a9f7e7f0497"
CkoStringBuilder *sbId = [[CkoStringBuilder alloc] init];
[sbId Append: [jsonResp StringOf: @"id"]];
NSString *certVersion = [sbId GetAfterFinal: @"/" removeFlag: NO];
NSLog(@"%@%@",@"The key vault cert version is ",certVersion);

//  {
//    "id": "https://kvchilkat.vault.azure.net/certificates/importCert01/7140c8755ed14839b5d86a9f7e7f0497",
//    "kid": "https://kvchilkat.vault.azure.net/keys/importCert01/7140c8755ed14839b5d86a9f7e7f0497",
//    "sid": "https://kvchilkat.vault.azure.net/secrets/importCert01/7140c8755ed14839b5d86a9f7e7f0497",
//    "x5t": "I_e3776K5Q_6PN1HHvJoI2ZGQRQ",
//    "cer": "MIIGXjCCB .... cjTsi7yIY=",
//    "attributes": {
//      "enabled": true,
//      "nbf": 1633996800,
//      "exp": 1728691199,
//      "created": 1697411128,
//      "updated": 1697411128,
//      "recoveryLevel": "CustomizedRecoverable+Purgeable",
//      "recoverableDays": 7
//    },
//    "policy": {
//      "id": "https://kvchilkat.vault.azure.net/certificates/importCert01/policy",
//      "key_props": {
//        "exportable": true,
//        "kty": "RSA",
//        "key_size": 4096,
//        "reuse_key": false
//      },
//      "secret_props": {
//        "contentType": "application/x-pkcs12"
//      },
//      "x509_props": {
//        "subject": "CN=\"Chilkat Software, Inc.\", O=\"Chilkat Software, Inc.\", S=Illinois, C=US",
//        "ekus": [
//          "1.3.6.1.5.5.7.3.3"
//        ],
//        "key_usage": [
//          "digitalSignature"
//        ],
//        "validity_months": 37,
//        "basic_constraints": {
//          "ca": false
//        }
//      },
//      "lifetime_actions": [
//        {
//          "trigger": {
//            "lifetime_percentage": 80
//          },
//          "action": {
//            "action_type": "EmailContacts"
//          }
//        }
//      ],
//      "issuer": {
//        "name": "Unknown"
//      },
//      "attributes": {
//        "enabled": true,
//        "created": 1697411128,
//        "updated": 1697411128
//      }
//    }
//  }