Function ChangePassphrase

src/twadmin/twadmincl.cpp:2059–2094

// cTWAModeChangePassphrases

static bool ChangePassphrase(const TCHAR* keyPath, wc16_string passphraseOld, wc16_string passphrase)
{
    // in order to leave original password data intact upon return,
    // we must allocate a BIGENDIAN copy
    // and delete it before we return.
    // auto_ptr does not help (won't work with arrays).
    size_t passphraseLenOld  = passphraseOld.length() * sizeof(WCHAR16);
    size_t passphraseLen     = passphrase.length() * sizeof(WCHAR16);
    int8*  passphraseCopyOld = new int8[passphraseLenOld];
    int8*  passphraseCopy    = new int8[passphraseLen];
#ifdef WORDS_BIGENDIAN
    memcpy(passphraseCopyOld, passphraseOld.data(), passphraseLenOld);
    memcpy(passphraseCopy, passphrase.data(), passphraseLen);
#else
    swab(passphraseOld.data(), passphraseCopyOld, passphraseLenOld);
    swab(passphrase.data(), passphraseCopy, passphraseLen);
#endif

    bool result;
    try
    {
        cKeyFile keyfile;
        keyfile.ReadFile(keyPath);
        keyfile.ChangePassphrase(passphraseCopyOld, passphraseLenOld, passphraseCopy, passphraseLen);
        keyfile.WriteFile(keyPath);
        result = true;
    }
    catch (eKeyFile& e)
    {
        cTWUtil::PrintErrorMsg(e);
        result = false;
    }
    delete [] passphraseCopyOld;
    delete [] passphraseCopy;
    return result;
}

class cTWAModeChangePassphrases : public cTWAModeCommon
{