I'm trying to implement AES symmetric encryption using the OpenSSL library. In the encryption examples, after calling the EVP_EncryptUpdate
function, the EVP_EncryptFinal_ex
function is immediately called. What is the purpose of calling the EVP_EncryptFinal_ex
function?
Purpose of EVP_EncryptFinal_ex function in OpenSSL
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This is strangely only explained in the API documentation of
EVP_EncryptUpdate()
:In general, it will perform any final calculations that cannot be performed without knowing that the last part of the message are being encrypted. Most (lower level) cryptographic libraries contain an update / final notion. Note that in case of OpenSSL the authentication tag is not considered part of the ciphertext.
Although it is considered good practice to call
EVP_EncryptFinal_ex
, the function doesn't really do much for modes that don't require full blocks of plaintext or padding. Most cryptographic libraries - including OpenSSL - try and encrypt the delivered plaintext as soon as possible; you should however not take that for granted.