I found this post to this group:
https://groups.google.com/forum/?fromgroups=#!topic/cryptopp-users/kJtKGI6Y0p8
In this example, he seems to be able to successfully use an ArraySink like
this:
byte * PrivateArray;
byte * PublicArray;
CryptoPP::AutoSeededRandomPool rng;
// Specify 1024 bit modulus, accept e = 17
CryptoPP::RSAES_OAEP_SHA_Decryptor Decryptor( rng, 1024 /*, e */ );
CryptoPP::HexEncoder privArray(new
CryptoPP::ArraySink( PrivateArray,sizeof(PrivateArray) )
); // Hex Encoder
Decryptor.DEREncode(privArray);
privArray.MessageEnd();
cout <<" Private key is: ";
CryptoPP::HexEncoder(privArray).Get(PrivateArray,
sizeof (PrivateArray));
cout << endl;
CryptoPP:: RSAES_OAEP_SHA_Encryptor Encryptor(Decryptor);
CryptoPP::HexEncoder pubArray(new
CryptoPP::ArraySink(PublicArray,sizeof(PublicArray) ) ); // Hex
Encoder
Encryptor.DEREncode(pubArray);
pubArray.MessageEnd();
cout <<" Public key is: ";
CryptoPP::HexEncoder(pubArray).Get(PublicArray,
sizeof(PublicArray));
cout << endl;
I'm finding two points confusing:
When he uses this:
CryptoPP::HexEncoder privArray(new
CryptoPP::ArraySink( PrivateArray,sizeof(PrivateArray) )
); // Hex Encoder
The array PrivateArray has been declared, but it has no size, so
"sizeof(PrivateArray)" should be 0 (or NULL?). Does CryptoPP realize this
and take care of it by creating the array at the length it needs? And if
it doesn't, then how would I use any ArraySink without knowing how large it
will need to be ahead of time? (This is especially a problem for Gzip.)
The second is afterwards - I know I'm new to C++ and there's a lot I don't
know, but my understanding is that sizeof(byte*) does not always return an
accurate answer. So how after using an ArraySink, how do I know how long
the array is?
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