(C) Determine if a Zip is Encrypted or Password-Protected

Determins whether or not a zip archive is AES encrypted or password-protected.

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MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

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C++ Builder Libraries

FreeBSD C++ Libraries

HP-UX C++ Libraries

BlackBerry QNX C++ Libraries

#include <C_CkZip.h>

void ChilkatSample(void)
    {
    HCkZip zip;
    BOOL success;
    BOOL bPwdProt;
    long encValue;

    zip = CkZip_Create();

    //  Any string unlocks the component for the 1st 30-days.
    success = CkZip_UnlockComponent(zip,"Anything for 30-day trial");
    if (success != TRUE) {
        printf("%s\n",CkZip_lastErrorText(zip));
        return;
    }

    //  An encrypted or password-protected zip can be opened
    //  without specifying the password.  However, the contents
    //  of the files cannot be unzipped without providing the correct
    //  password.

    success = CkZip_OpenZip(zip,"something.zip");
    if (success != TRUE) {
        printf("%s\n",CkZip_lastErrorText(zip));
        return;
    }

    //  If the zip is password-protected, meaning that it uses
    //  the old (insecure) Zip 2.0 encryption, then the
    //  PasswordProtect property will be TRUE

    bPwdProt = CkZip_getPasswordProtect(zip);
    if (bPwdProt) {
        printf("This zip is password-protected.\n");
    }

    //  If the zip is AES encrypted (WinZip compatible) then
    //  the Encryption property will be equal to 4.

    encValue = CkZip_getEncryption(zip);
    if (encValue == 4) {
        printf("This zip is AES encrypted.\n");
    }

    //  If the Encryption property = 0, then the zip is NOT
    //  strong encrypted, and is either password-protected or
    //  entirely unencrypted, depending on the value of the
    //  PasswordProtect property.

    //  If the Encryption property = 1, 2, or 3, then the zip was
    //  encrypted using AES, Blowfish, or Twofish using a
    //  Chilkat-specific encryption format that was implemented
    //  prior to the publication of the Zip AES standard.

    CkZip_CloseZip(zip);

    CkZip_Dispose(zip);

    }