how to verify if the public_key is valid to decrypt data using RSA_public_decrypt()

[Shaun R.]

I'm using RSA to encrypt/decrypt some text.  I encrypt the data using the 
private key and then decrypt it using RSA_public_decrypt().  One thing i 
noticed was that if the data was not encrypted using the correct private key 
that RSA_public_decrypt() will just set the output to giberish.  Is there 
anyway to check if the public_key is the correct key to decrypt that data 
before actually decrypting it?  That way i can bail out early and say 
invalid data file rather than parsing through a bunch of giberish?

~Shaun 


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