C++

openssl smime -encrypt -des3 -in <file> <pem file>

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OpenSSL SMIME encrypt file using PEM containing a certificate. C++

#include <CkPem.h>
#include <CkCert.h>
#include <CkCrypt2.h>
#include <CkBinData.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    // Load the cert from a PEM file.

    CkPem pem;
    // Our particular PEM was not encrypted, so we pass an empty password.
    // Also, a private key is not needed for encryption.  The PEM used to test this example
    // happens to have a private key, but it's not actually used.
    success = pem.LoadPemFile("qa_data/openssl/rsaCertAndKey.pem","");
    if (success == false) {
        std::cout << pem.lastErrorText() << "\r\n";
        return;
    }

    if (pem.get_NumCerts() == 0) {
        std::cout << "PEM does not contain any certificates." << "\r\n";
        return;
    }

    CkCert *cert = pem.GetCert(0);
    if (pem.get_LastMethodSuccess() == false) {
        std::cout << pem.lastErrorText() << "\r\n";
        return;
    }

    // -------------------------------------------------------------------------------------
    // Duplicate this OpenSSL command:   openssl smime -encrypt -des3 -in <file> <pem file>
    // -------------------------------------------------------------------------------------
    CkCrypt2 crypt;
    success = crypt.SetEncryptCert(*cert);
    if (success == false) {
        std::cout << crypt.lastErrorText() << "\r\n";
        delete cert;
        return;
    }

    delete cert;

    crypt.put_CryptAlgorithm("PKI");
    crypt.put_Pkcs7CryptAlg("3des");
    crypt.put_KeyLength(168);

    // Load the file to be encrypted.
    CkBinData bd;
    success = bd.LoadFile("qa_data/openssl/hello.txt");
    if (success == false) {
        std::cout << "Failed to load the input file." << "\r\n";
        return;
    }

    // Encrypt.
    success = crypt.EncryptBd(bd);
    if (success == false) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    // The openssl smime -encrypt command produces encrypte MIME such as this:

    // MIME-Version: 1.0
    // Content-Disposition: attachment; filename="smime.p7m"
    // Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data; name="smime.p7m"
    // Content-Transfer-Encoding: base64
    // 
    // MIICzwYJKoZIhvcNAQcDoIICwDCCArwCAQAxggF8MIIBeAIBADBgMEoxCzAJBgNVBAYTAlVTMRYw
    // FAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQDExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBY
    // MwISA9Nqgb1dH/XTDNeKzN1nR85iMA0GCSqGSIb3DQEBAQUABIIBAIQqPexjxWovgxwKV/r3HL/U
    // EP9Yozvz5hBeX5VvRZjKSi4FRw5wapElPK+4FB82hiAR9Mi3c16PvPSVkJv3l78Mv5uaaOs/OmUz
    // mIHFB6Z+l2E52BDmUVWJZTQ09vdWy6+NIRlg2R9Z1NkmZ4BZCJk6mHB/Yx03IaOxK8LnwieDMthM
    // SvxbhJnIOISN7k7ofs+/0vTXUpdQ+tlmwyVySMGQ6VMk+z4sqZJ2stacqCPtt/aiSwJ9p0OKmihf
    // 3KDJceXJtavIQeA97yz1LqPvle35mmd5sBhV9qQYdTV/KJ+YM5uEZ9BHYbvMJbADFHwKzhcEY3qA
    // 7T9acmEsb7NycOIwggE1BgkqhkiG9w0BBwEwFAYIKoZIhvcNAwcECERX/ZoHweSkgIIBEMmCMx49
    // zjVAnGqRaBbvzQT1hg0uQSxIJjxMxC+HSuM+eY9oSOsbrw4uIijHKH9NdOpeDsdRzg2z5EBM7AlP
    // Ht9DyPW5C2deV6RPX4F8gyExz+JUXrd+3Yb3AKTdpDkTWDmNCeO0r/YSqp518+mfU5hG8e336u51
    // HAM44FeknA8oThWsD/wUB1e8vzsatK4UXW/KSu/166V7z+VT86kd+IHa7t60U9Yp0ZXgcM5Pb5Ni
    // 69Qc5MKPzom2801H5UR/WjCgsxOIjOj49sKisjRy79skrJzxY5ZG05T0dKn6KC3TjRpIEEeOyhCd
    // Nm2Y7dcW8GLMepdhWay5vePmQxmvmhbAtBprIem14NcrYeG6D5wP

    // We have the body in bd
    // Construct the header and base64 body...
    CkStringBuilder sbEncryptedMime;

    sbEncryptedMime.AppendLine("MIME-Version: 1.0",true);
    sbEncryptedMime.AppendLine("Content-Disposition: attachment; filename=\"smime.p7m\"",true);
    sbEncryptedMime.AppendLine("Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data; name=\"smime.p7m\"",true);
    sbEncryptedMime.AppendLine("Content-Transfer-Encoding: base64",true);
    sbEncryptedMime.AppendLine("",true);
    sbEncryptedMime.AppendLine(bd.getEncoded("base64_mime"),true);

    // Show the result.
    std::cout << sbEncryptedMime.getAsString() << "\r\n";

    // or save to a file..
    success = sbEncryptedMime.WriteFile("qa_output/encryptedMime.txt","utf-8",false);
    }