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    <p>Microsoft Crypto API contain high-level functions for asymmetric encryption and decryption with certificates. Look at <code>CryptEncryptessage</code> and <code>CryptDecryptMessage</code>.</p> <p>In decryption case your CERT_CONTEXT must have a <code>CERT_KEY_PROV_INFO_PROP_ID</code> property.</p> <p>I can give you an examples of usage:</p> <pre><code>const wchar_t message[] = L"This is a simple test message."; PCCERT_CONTEXT hCert = NULL; HCERTSTORE hStore = NULL; static bool openCertStoreMY(CDialog *parent) { if(!hStore) { hStore = CertOpenSystemStore(NULL, L"MY"); if(!hStore) { parent-&gt;MessageBox(L"Cannot open \"MY\"", L"Error", MB_ICONERROR); return false; } } return true; } void CTestDlg::OnEncryptClicked() { if(!hCert) { if(!openCertStoreMY(this)) return; hCert = CryptUIDlgSelectCertificateFromStore(hStore, GetSafeHwnd(), NULL, NULL, 0, 0, 0); if(!hCert) return; } CRYPT_ENCRYPT_MESSAGE_PARA params; memset(&amp;params, 0, sizeof(CRYPT_ENCRYPT_MESSAGE_PARA)); params.cbSize = sizeof(CRYPT_ENCRYPT_MESSAGE_PARA); params.dwMsgEncodingType = X509_ASN_ENCODING | PKCS_7_ASN_ENCODING; params.ContentEncryptionAlgorithm.pszObjId = "2.16.840.1.101.3.4.1.2"; //AES128 DWORD msz; DWORD cbMsg = sizeof(message); const BYTE *pbMsg = (PBYTE)message; if(!CryptEncryptMessage(&amp;params, 1, &amp;hCert, pbMsg, cbMsg, NULL, &amp;msz)) return; PBYTE outBuf = new BYTE[msz]; if(CryptEncryptMessage(&amp;params, 1, &amp;hCert, pbMsg, cbMsg, outBuf, &amp;msz)) { FILE *fil = _wfopen(filename, L"wb"); if(fil) { fwrite(outBuf, 1, msz, fil); fclose(fil); MessageBox(L"Complete"); } else MessageBox(L"Cannot open file", L"Error", MB_ICONERROR); } delete [] outBuf; } void CTestDlg::OnDecryptClicked() { if(!openCertStoreMY(this)) return; CRYPT_DECRYPT_MESSAGE_PARA params; params.cbSize = sizeof(CRYPT_DECRYPT_MESSAGE_PARA); params.dwMsgAndCertEncodingType = X509_ASN_ENCODING | PKCS_7_ASN_ENCODING; params.cCertStore = 1; params.rghCertStore = &amp;hStore; params.dwFlags = 0; DWORD cbMsg; PBYTE pbMsg; FILE *fil = _wfopen(filename, L"rb"); if(fil) { fseek(fil, 0 ,2); cbMsg = ftell(fil); fseek(fil, 0, 0); pbMsg = new BYTE[cbMsg]; fread(pbMsg, 1, cbMsg, fil); fclose(fil); } else { MessageBox(L"Cannot open file", L"Error", MB_ICONERROR); return; } DWORD msz; if(!CryptDecryptMessage(&amp;params, pbMsg, cbMsg, NULL, &amp;msz, NULL)) { delete [] pbMsg; return; } PBYTE outBuf = new BYTE[msz]; if(CryptDecryptMessage(&amp;params, pbMsg, cbMsg, outBuf, &amp;msz, NULL)) MessageBox((LPCWSTR)outBuf); delete [] pbMsg; delete [] outBuf; } </code></pre>
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    1. POHow to encrypt data using a certificate?
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