asked on

Rijndael string encryption in C++

I am working on a program that users can read and write AES encrypted string values. I am talking about a string that would fit in an Edit box for example. Not encryption/decryption of an entire file. I see a lot of examples of file encryption, using larger memory blocks, etc. But I am not finding anything for just individual strings.

Can anyone point me in the right direction.

jkr

It's actually quite straightfoward using e.g. CryptoPP (http://www.cryptopp.com/), e.g.

        std::string strEncrypted, strDecrypted; // source and target

        // ...

        CryptoPP::AutoSeededRandomPool rng;   

		RSA::PrivateKey k1;
		// load/assign key

		////////////////////////////////////////////////////////////////////////////////////

		if(!k1.Validate(rng, 3)) // validate
			throw "Rsa private key validation failed";

		////////////////////////////////////////////////
		// Decryption
		CryptoPP::RSAES_OAEP_SHA_Decryptor d(k1);

			CryptoPP::StringSource( strEncrypted, true,
				new CryptoPP::PK_DecryptorFilter( rng, d,
					new CryptoPP::StringSink(strDecrypted)
				) // PK_DecryptorFilter
			 ); // StringSource

Open in new window

ASKER CERTIFIED SOLUTION

jkr

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

Karrtik Iyer

The below link also gives more examples for download on cryptocpp.
http://www.cryptopp.com/wiki/Advanced_Encryption_Standard