Hello, > I am still having a problem running RSA_verify which returns 'Data too large > for modulus' errors. If I check the big number value of the 'signatureValue' > and 'Modulus' they are 268628280 and 268628488 respectively which obviously > explains the error I am receiving. Not exactly, modulus is 1024 bit integer so number 268628280 does not look as RSA modulus from 1024 bit key.
Suppose this is only printing error and your conversion routine works good, you should check that your signature is made with private key with the same modulus as your public key - this numbers must be equal. If this keys differ then there may be situation where signed data is bigger then public key modulus. Best regards, -- Marek Marcola <[EMAIL PROTECTED]>