Unicode C

Create PKCS7 (CMS) EnvelopedData

Encrypt some data to a recipient by creating a PKCS7 (CMS) EnvelopedData structure. The data will be encrypted using a symmetric content-encryption algorithm (e.g., AES), and the randomly generated symmetric key will be encrypted using the recipient’s RSA public key extracted from their X.509 certificate. Unicode C

#include <C_CkCrypt2W.h>
#include <C_CkCertW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCrypt2W crypt;
    HCkCertW cert;
    const wchar_t *toBeEncrypted;
    const wchar_t *result;

    success = FALSE;

    crypt = CkCrypt2W_Create();

    //  Specify the encryption to be used.
    //  "pki" indicates "Public Key Infrastructure" and will create a PKCS7 encrypted (enveloped-data) message.
    CkCrypt2W_putCryptAlgorithm(crypt,L"pki");
    CkCrypt2W_putPkcs7CryptAlg(crypt,L"aes");
    CkCrypt2W_putKeyLength(crypt,256);
    CkCrypt2W_putOaepHash(crypt,L"sha256");
    CkCrypt2W_putOaepPadding(crypt,TRUE);

    cert = CkCertW_Create();

    //  Use a certificate found in the Windows certificate store.
    success = CkCertW_LoadByCommonName(cert,L"My Certificate");
    if (success != TRUE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        return;
    }

    //  Tell the crypt object to use the certificate.
    CkCrypt2W_SetEncryptCert(crypt,cert);

    toBeEncrypted = L"This string is to be encrypted.";

    //  Get the result in multi-line BASE64 MIME format.
    CkCrypt2W_putEncodingMode(crypt,L"base64_mime");
    CkCrypt2W_putCharset(crypt,L"utf-8");

    result = CkCrypt2W_encryptStringENC(crypt,toBeEncrypted);
    if (success != TRUE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        return;
    }

    //  -------------------------------------------------------------------------
    //  See the following example to decrypt what was created in this example
    //  Decrypt PKCS7 (CMS) EnvelopedData
    //  -------------------------------------------------------------------------

    wprintf(L"%s\n",result);

    //  Sample output:

    //  MIICSgYJKoZIhvcNAQcDoIICOzCCAjcCAQAxggHiMIIB3gIBADCBljCBgTELMAkGA1UEBhMCSVQx
    //  EDAOBgNVBAgMB0JlcmdhbW8xGTAXBgNVBAcMEFBvbnRlIFNhbiBQaWV0cm8xFzAVBgNVBAoMDkFj
    //  dGFsaXMgUy5wLkEuMSwwKgYDVQQDDCNBY3RhbGlzIENsaWVudCBBdXRoZW50aWNhdGlvbiBDQSBH
    //  MwIQPCWvkSv8oQ7xRmEHJ6TzEDA8BgkqhkiG9w0BAQcwL6APMA0GCWCGSAFlAwQCAQUAoRwwGgYJ
    //  KoZIhvcNAQEIMA0GCWCGSAFlAwQCAQUABIIBAKqHAPQNSsQoX7B2NH7QyEOWQRsSVs8oCHXmy8f4
    //  MVZD2er3bvYUCIomxpwbLEAl14qjUIMynahooYGgqip7+4FqL301G+BVjZVfEhHWj+VI1dAWnWuL
    //  VHlvc/pbQNBWqV8rKVJsNIsuAZkdj4WSwLVKxYkYX43B8fh/g71XN2DTJu7Z/824v48KBmgpQBOT
    //  2q7IcDGxNPAFN2p6eavIVGn2LvhEbf/Fszyj+GR5tMcnQP1BOLJ3s3JzUBbvj8hcZrF1Vhl9HnTU
    //  YQx8G/KdW1mR+Wlhl3BWoK0LYKRTbnTx2BXOs0CY1SXOAdhKr01ZYjA+xW4nGzY0lfXS9QZjh9gw
    //  TAYJKoZIhvcNAQcBMB0GCWCGSAFlAwQBKgQQw0xTbfmnt0zjWHo5SaQIp4AgxTVY9E/Ncqy6t+RM
    //  8y4c3Av62/wB8IpPUEmtM2OeuZo=


    CkCrypt2W_Dispose(crypt);
    CkCertW_Dispose(cert);

    }