MIME S/MIME Encryption Algorithm Properties

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Demonstrates the properties that control S/MIME encryption: Pkcs7CryptAlg (the symmetric content-encryption algorithm), Pkcs7KeyLength (the content-encryption key length in bits), OaepPadding (whether RSAES-OAEP key transport is used instead of RSAES-PKCS1-v1_5), and the OAEP hash settings OaepHash and OaepMgfHash. The properties are configured before calling Encrypt.

#include <CkMimeW.h>
#include <CkCertW.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkMimeW mime;
    success = mime.SetBodyFromPlainText(L"This message will be encrypted.");
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    //  Pkcs7CryptAlg is the symmetric content-encryption algorithm.  Supported values are aes, aes-gcm,
    //  des, 3des, and rc2.  The default is aes.
    mime.put_Pkcs7CryptAlg(L"aes");

    //  Pkcs7KeyLength is the content-encryption key length in bits.  The default is 128.
    mime.put_Pkcs7KeyLength(256);

    //  OaepPadding selects the RSA key-transport padding.  The default is false (RSAES-PKCS1-v1_5).
    //  Set true to use RSAES-OAEP, in which case the OAEP hash settings apply.
    mime.put_OaepPadding(true);
    mime.put_OaepHash(L"sha256");
    mime.put_OaepMgfHash(L"sha256");

    //  Load the recipient certificate (public key is sufficient for encrypting).
    CkCertW cert;
    success = cert.LoadFromFile(L"qa_data/recipient.cer");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    //  Encrypt using the algorithm settings configured above.
    success = mime.Encrypt(cert);
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    wprintf(L"Encrypted with %s %d-bit key.\n",mime.pkcs7CryptAlg(),mime.get_Pkcs7KeyLength());
    }