(C) Extract a File from a .p7m (PKCS7 Signed-Data)

C example to extract the original file from a .p7m (Signed-Data PKCS7 Format) The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

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#include <C_CkCrypt2.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    BOOL success;
    const char * outFile;
    const char * inFile;

    crypt = CkCrypt2_Create();

    //  Any string argument automatically begins the 30-day trial.

    success = CkCrypt2_UnlockComponent(crypt,"30-day trial");
    if (success != TRUE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        return;
    }

    outFile = "/Users/chilkat/testData/pdf/sample.pdf";

    inFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m";

    //  Verify and restore the original file:
    success = CkCrypt2_VerifyP7M(crypt,inFile,outFile);
    if (success == FALSE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        return;
    }

    printf("Success!\n");

    CkCrypt2_Dispose(crypt);

    }