(Unicode C) Extract PKCS7 from MIME and Decrypt

Extracts the base64-encoded PKCS7 body of a MIME message to a file, and then decrypts using Chilkat Crypt2.

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <C_CkMimeW.h>
#include <C_CkCrypt2W.h>

void ChilkatSample(void)
    {
    HCkMimeW mime;
    BOOL success;
    HCkCrypt2W crypt;
    const wchar_t *inPath;
    const wchar_t *outPath;

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

    mime = CkMimeW_Create();

    success = CkMimeW_LoadMimeFile(mime,L"c:/aaworkarea/EmailInBytes.txt");
    if (success != TRUE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkMimeW_Dispose(mime);
        return;
    }

    success = CkMimeW_SaveBody(mime,L"c:/aaworkarea/smime.p7m");
    if (success != TRUE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkMimeW_Dispose(mime);
        return;
    }

    crypt = CkCrypt2W_Create();

    success = CkCrypt2W_AddPfxSourceFile(crypt,L"c:/aaworkarea/my.pfx",L"pfxPassword");
    if (success == FALSE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkMimeW_Dispose(mime);
        CkCrypt2W_Dispose(crypt);
        return;
    }

    // Indicate the public-key (PKCS7) encryption/decryption should be used:
    CkCrypt2W_putCryptAlgorithm(crypt,L"pki");

    inPath = L"c:/aaworkarea/smime.p7m";
    outPath = L"c:/aaworkarea/decrypted.dat";

    success = CkCrypt2W_CkDecryptFile(crypt,inPath,outPath);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkMimeW_Dispose(mime);
        CkCrypt2W_Dispose(crypt);
        return;
    }

    wprintf(L"Success.\n");


    CkMimeW_Dispose(mime);
    CkCrypt2W_Dispose(crypt);

    }