How can I use RSA classes of cryptography api?

[ageOfmacio]

Hi All,

how can I use RSA classes of cryptography api?

I try to use function DecryptL() of class CRSAPKCS1v15Decryptor.

But the function is not available.
Compilation OK.
At debug following hint is given:
dec -> DecryptL(cipherText,plainText);
dec -> DecryptL = identifier is not a valid struct/union/class member

CRSAPKCS1v15Decryptor* dec = CRSAPKCS1v15Decryptor::NewL((CRSAPrivateKey&)privKey);

Thanks,
Andree

[wizard_hu_]

CRSAPKCS1v15Decryptor::DecryptL is properly declared in cryptoasymmetric.h, re-check what you are doing (for example make sure that "dec" is accessible in the given scope).

[ageOfmacio]

CRSAPKCS1v15Decryptor:ecryptL is properly declared in cryptoasymmetric.h, re-check what you are doing (for example make sure that "dec" is accessible in the given scope).

I'm sure "dec" is accessible in the given scope.

Enclosed the given function.

void CDecryptView::decryptData() {

     _LIT8(aD,"12345678");
     _LIT8(aN,"123456789");
     
     //Prepare Key & Decryptor
    RInteger iN = RInteger::NewL(aN);
    RInteger iD = RInteger::NewL(aD);
    
    const CRSAPrivateKeyStandard* privKey = CRSAPrivateKeyStandard::NewLC(iN, iD);
    CRSAPKCS1v15Decryptor* dec = CRSAPKCS1v15Decryptor::NewL((CRSAPrivateKey&)privKey);
    
    //Prepare filesessionserver
    RFs fsSession;
    fsSession.Connect();
    RFile inFile, outFile;
    
    //Open, Read, Flush and Close inputFile
    inFile.Open(fsSession,_L("C:\\shared\\test_0_cipher.txt"),EFileRead);
    TBuf8<1024> cipherText;
    TInt size;
    inFile.Size(size);
    inFile.Read(cipherText,size);
    inFile.Flush();
    inFile.Close();
    
    //Decrypt
    TBuf8<1024> plainText;
    TInt maxInputLength;
    TInt maxOutputLength;
    maxInputLength = dec->MaxInputLength(); // no error
    maxOutputLength = dec->MaxOutputLength(); // no error

    dec->DecryptL(cipherText,plainText); // ERROR
    
    //Open, Write, Flush and Close outputFile
    TInt err = outFile.Open(fsSession,_L("c:\\shared\\test_0_cipher_out.txt"),EFileWrite);
    if (err==KErrNotFound) // 
    outFile.Create(fsSession,_L("c:\\shared\\test_0_cipher_out.txt"),EFileStreamText|EFileWrite|EFileShareAny);

    outFile.Write(plainText,size);
    outFile.Flush();
    outFile.Close();
    
    RFileLogger::WriteFormat(fileDir, fileName, EFileLoggingModeAppend,
                  Exception, 10000);

}

Any other idea?


Thanks,

Andree

[Paul.Todd]

This looks like you have not #included cryptoasymetric.h

[ageOfmacio]

This looks like you have not #included cryptoasymetric.h

In this case previous lines must also faulty. Or not?

The line is available.

[Paul.Todd]

No, because you can forward declare the class asits a pointer

[wizard_hu_]

The strange thing is that the NewL seems to be accepted just a few lines above. Though it might happen that the error messages are not ordered by lines, and the NewL also has its error somewhere else.

EDIT: oops, I was trying to reply #4...

[Paul.Todd]

Well it works for us
CRSAPKCS1v15Encryptor * encryptor = CRSAPKCS1v15Encryptor::NewLC(aPublic);
CRSAPKCS1v15Decryptor * decryptor = CRSAPKCS1v15Decryptor::NewLC(aPrivate);

....

encryptor->EncryptL(raw, encrypted);
decryptor->DecryptL(encrypted, decrypted);
test(decrypted.Compare(raw) == 0);
CleanupStack::PopAndDestroy(2, encryptor);

In the original example there was a space between the -> and Decrypt is that the case.

Can you also post the actual error from carbide or the output build log

[ageOfmacio]

In the original example there was a space between the -> and Decrypt is that the case.

Orignal example? What do you think?
I cleared the spaces.

Can you also post the actual error from carbide or the output build log

Please patient. I must restart my computer.

[ageOfmacio]

I replace the Sourceline with

TRAPD(err3, dec->DecryptL(cipherText,plainText));

After execution err3 is -5 (= KErrNotSupported = The operation requested is not supported).

Has anybody an validated example?
Ideally as Carbide.c++ 1.3 project.

Thanks,
Andree