Unicode C
Unicode C
Azure Key Vault Sign with a Certificate's Private Key
See more Azure Key Vault Examples
Signs a hash using the private key of a certificate previously imported to an Azure Key Vault.Chilkat Unicode C Downloads
#include <C_CkJsonObjectW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkHttpW.h>
#include <C_CkHttpResponseW.h>
#include <C_CkCertW.h>
#include <C_CkRsaW.h>
void ChilkatSample(void)
{
BOOL success;
HCkJsonObjectW json;
HCkStringBuilderW sb;
const wchar_t *signedString;
const wchar_t *hash_base64url;
HCkJsonObjectW jsonBody;
HCkHttpW http;
const wchar_t *url;
HCkHttpResponseW resp;
int statusCode;
HCkJsonObjectW jsonResp;
HCkCertW cert;
HCkRsaW rsa;
BOOL valid;
success = FALSE;
// 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.
json = CkJsonObjectW_Create();
CkJsonObjectW_UpdateString(json,L"client_id",L"APP_ID");
CkJsonObjectW_UpdateString(json,L"client_secret",L"APP_PASSWORD");
CkJsonObjectW_UpdateString(json,L"resource",L"https://vault.azure.net");
CkJsonObjectW_UpdateString(json,L"token_endpoint",L"https://login.microsoftonline.com/TENANT_ID/oauth2/token");
// In this example, we'll sign the SHA256 hash of the string "This is a test"
sb = CkStringBuilderW_Create();
signedString = L"This is a test";
CkStringBuilderW_Append(sb,signedString);
hash_base64url = CkStringBuilderW_getHash(sb,L"sha256",L"base64url",L"utf-8");
// We're going to send a POST to the following URL:
// POST {vaultBaseUrl}/keys/{key-or-cert-name}/{key-or-cert-version}/sign?api-version=7.4
// For example:
// POST https://VAULT_NAME.vault.azure.net/keys/CERT_NAME/CERT_VERSION/sign?api-version=7.4
//
// {
// "alg": "RS512",
// "value": "RUE3Nzg4NTQ4QjQ5RjFFN0U2NzAyQzhDNEMwMkJDOTA1MTYyOTUzNjI5NDhBNzZDQTlFOTM1NDA2M0ZGMjk2Mg"
// }
// The alg can be one of the following
// ES256 ECDSA using P-256 and SHA-256
// ES256K ECDSA using P-256K and SHA-256
// ES384 ECDSA using P-384 and SHA-384
// ES512 ECDSA using P-521 and SHA-512
// PS256 RSASSA-PSS using SHA-256 and MGF1 with SHA-256
// PS384 RSASSA-PSS using SHA-384 and MGF1 with SHA-384
// PS512 RSASSA-PSS using SHA-512 and MGF1 with SHA-512
// RS256 RSASSA-PKCS1-v1_5 using SHA-256
// RS384 RSASSA-PKCS1-v1_5 using SHA-384
// RS512 RSASSA-PKCS1-v1_5 using SHA-512
// The sample POST above uses SHA512. We'll instead sign a SHA256 hash..
jsonBody = CkJsonObjectW_Create();
CkJsonObjectW_UpdateString(jsonBody,L"alg",L"RS256");
CkJsonObjectW_UpdateString(jsonBody,L"value",hash_base64url);
http = CkHttpW_Create();
// 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.
CkHttpW_putAuthToken(http,CkJsonObjectW_emit(json));
CkHttpW_SetUrlVar(http,L"certName",L"importCert01");
CkHttpW_SetUrlVar(http,L"certVersion",L"7140c8755ed14839b5d86a9f7e7f0497");
// Note: Replace "VAULT_NAME" with the name of your Azure key vault.
url = L"https://VAULT_NAME.vault.azure.net/keys/{$certName}/{$certVersion}/sign?api-version=7.4";
resp = CkHttpResponseW_Create();
success = CkHttpW_HttpJson(http,L"POST",url,jsonBody,L"application/json",resp);
if (success == FALSE) {
wprintf(L"%s\n",CkHttpW_lastErrorText(http));
CkJsonObjectW_Dispose(json);
CkStringBuilderW_Dispose(sb);
CkJsonObjectW_Dispose(jsonBody);
CkHttpW_Dispose(http);
CkHttpResponseW_Dispose(resp);
return;
}
statusCode = CkHttpResponseW_getStatusCode(resp);
jsonResp = CkJsonObjectW_Create();
CkHttpResponseW_GetBodyJson(resp,jsonResp);
CkJsonObjectW_putEmitCompact(jsonResp,FALSE);
wprintf(L"%s\n",CkJsonObjectW_emit(jsonResp));
if (statusCode != 200) {
wprintf(L"Failed.\n");
CkJsonObjectW_Dispose(json);
CkStringBuilderW_Dispose(sb);
CkJsonObjectW_Dispose(jsonBody);
CkHttpW_Dispose(http);
CkHttpResponseW_Dispose(resp);
CkJsonObjectW_Dispose(jsonResp);
return;
}
// A successful response body contains JSON like this:
// Note: Azure's documentation is not very clear, but base64url is the encoding, not "base64".
// {
// "kid": "https://kvchilkat.vault.azure.net/keys/importCert01/7140c8755ed14839b5d86a9f7e7f0497",
// "value": "JzWd2YF21gjtW ... Em37hKOQ"
// }
// Let's validate the signature using the cert's public key.
// This example will load the corresponding certificate from a local file and will verify the signature against the original data.
//
cert = CkCertW_Create();
success = CkCertW_LoadFromFile(cert,L"qa_data/certs/chilkat_code_signing_2024.cer");
if (success == FALSE) {
wprintf(L"%s\n",CkCertW_lastErrorText(cert));
CkJsonObjectW_Dispose(json);
CkStringBuilderW_Dispose(sb);
CkJsonObjectW_Dispose(jsonBody);
CkHttpW_Dispose(http);
CkHttpResponseW_Dispose(resp);
CkJsonObjectW_Dispose(jsonResp);
CkCertW_Dispose(cert);
return;
}
rsa = CkRsaW_Create();
// Tell the RSA object to use the cert's public key.
success = CkRsaW_SetX509Cert(rsa,cert,FALSE);
if (success == FALSE) {
wprintf(L"%s\n",CkRsaW_lastErrorText(rsa));
CkJsonObjectW_Dispose(json);
CkStringBuilderW_Dispose(sb);
CkJsonObjectW_Dispose(jsonBody);
CkHttpW_Dispose(http);
CkHttpResponseW_Dispose(resp);
CkJsonObjectW_Dispose(jsonResp);
CkCertW_Dispose(cert);
CkRsaW_Dispose(rsa);
return;
}
// Verify the signature using the cert's public key against the original string.
CkRsaW_putEncodingMode(rsa,L"base64url");
valid = CkRsaW_VerifyStringENC(rsa,signedString,L"sha-256",CkJsonObjectW_stringOf(jsonResp,L"value"));
wprintf(L"signature valid = %d\n",valid);
CkJsonObjectW_Dispose(json);
CkStringBuilderW_Dispose(sb);
CkJsonObjectW_Dispose(jsonBody);
CkHttpW_Dispose(http);
CkHttpResponseW_Dispose(resp);
CkJsonObjectW_Dispose(jsonResp);
CkCertW_Dispose(cert);
CkRsaW_Dispose(rsa);
}