I am new to cryptopp library, even new to C++ coding, and facing some issue
in C++ cryptopp library.
I have written following code for Encryption:
try{
AES::Encryption aesEncryption(pass,
AES_256);
CBC_Mode_ExternalCipher::Encryption cbcEncryption(aesEncryption,
true_iv);
StreamTransformationFilter *encryptor;
encryptor = new StreamTransformationFilter(cbcEncryption,
new FileSink(outputFileName)
);
encryptor->Put(iv, AES_256);
FileSource(inputFileName, true, encryptor);
return true;
}catch(CryptoPP::Exception &e)
{
cerr << "Caught exception during decryption!" << endl;
return false;
}
Following code for Decryption:
try {
StringSource(password, true, new HashFilter(*(new SHA256), new
ArraySink(pass,AES_256
)));
CryptoPP::AES::Decryption aesDecryption(pass,
AES_256);
CryptoPP::CBC_Mode_ExternalCipher::Decryption
cbcDecryption(aesDecryption, iv);
StreamTransformationFilter *decryptor;
decryptor = new
StreamTransformationFilter(cbcDecryption, new
FileSink(outputFileName));
char garbage[AES_256], iv_garbage[AES_256];
ifstream inf;
inf.open(inputFileName); inf.read(iv_garbage, AES_256);
cbcDecryption.ProcessData((byte *)garbage, (const byte
*)iv_garbage, AES_256);
FileSource(inf, true, decryptor);
inf.close();
return true;
}
catch(CryptoPP::Exception &e)
{
cerr << "Caught exception during decryption!" << endl;
return false;
}
My problem is when I use this code on iOS and Android platforms, it is
working like Magic and encrypting and decrypting files.
However on Windows platform I am getting following errors while Decryption.
- PKCS#7 padding error for some files
- Cipher text is not of block size for others.
None of the files are getting Decrypted. Although Encryption is working
fine. I am sure about Encryption, because I have encrypted one file on
Windows Platform and decrypted the same on iOS, it worked. So I am almost
sure that Encryption is not issue on Windows, only Decryption is causing me
problems.
Any help would be appreciated. I have searched for above errors a lot on
this and other groups, lots of solutions are present none of them worked
till now for me.
Please help. Thanks in advance.
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