Re: Best format for input to EVP_EncryptInit

[Ashutosh Jaiswal]

Hi Everyone, Just a quick question. I'm trying to encrypt a PKCS7 document with EVP_EncryptInit (for symmetric key encryption). What would be the best format to output the PKCS7 document (ASN/PEM/SMIME) to be used as an input for EVP_EncryptInit (which takes unsigned char as input)? I'm guessing SMIME (which would have to be encoded into uchar), but I would like to hear from others as well. EVP_EncryptInit() initializes contexts and keys and doesn't have anything ot do with S/MIME. If you mean the data to be encrypted being fed to EVP_EncryptUpdate() and EVP_EncryptFinal() the format doesn't matter: it isn't interpreted in any way and you get exactly the same data back when you decrypt. Steve. Sorry I meant, EVP_EncryptUpdate and EVP_EncryptFinal. My question was, if I want to feed the output of a function which generates a PKCS7 structure to the about EVP functions, what kind of conversion options do I have, so as to feed the PKCS7 structure (or the structure converted to ASN/PEM/SMIME) to the EVP functions. Would a simple cast do the work, or would I need to take some more elaborate measures? thanks, Ashu