There is no direct support for this in Crypto++, but you can do it in a few
steps. Use the RSAFunction and InvertibleRSAFunction classes in rsa.h to
encrypt and decrypt, and use Integer::Encode and Integer::Decode to convert
byte arrays to and from Integer.
----- Original Message -----
From: "jduffy" <[EMAIL PROTECTED]>
To: "Crypto++ Users" <[EMAIL PROTECTED]>
Sent: Thursday, January 18, 2007 3:04 AM
Subject: Straight RSA Decryption with No Padding
All,
I checked previous posts, but I couldn't find the answer to this
question. If it's there, my apologies.
I'm looking for some direction on how to properly decrypt a message
using a public key without any padding.
Our application uses a challenge response algorithm between a client
and server. Simply, the challenge is issued, and the client proves it
has possession of the private key by signed the issued challenge.
Since the challenge is designed to be the same length as the key, our
Java-server signs the challenge with NO padding.
However, when I look through crypto++, all I find are the OAEP and PKCS
padding schemes. As neither seem to work, how to I setup crypto++ to
decrypt these non-padded messages?
Thanks for all your help in advance.
Best,
John
>
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