Stream Encription

[Ilya Yurkevich]

Hello,
I have a client, that sends me data, that I need to encrypt, in few steps. I 
can use such functions in PKCS11: C_EncryptInit (...), C_EncryptUpdate (...), 
C_EncryptFinal (...). It allows me add data, that will be encrypted at every 
step, using C_EncryptUpdate   function.
 
In OpenSSL I found CMS_encrypt (...) with flag = CMS_STREAM, but I can't 
understand how I can add data as I described above or another way? I get data 
in unsigned char* every time. Any help would be appreciated. Thanks.