I am attempting to sign a message using the test application that ships with the Crypto++ library (which uses RSASS to sign a message). If I use a very small key to sign a very large file, I get a KeyTooSmall exception. I know that in the real world hashes of messages are signed rather than the messages themselves to alleviate this problem, but for the sake of argument, is there a way to tell at run time that maximum message size that can be signed for a given private key?
Thanks in advance for your help! David Brownell
