Questions about Ciphers

Patrice Guérin <guerinp@xxxxxxxxx> · Thu, 14 Feb 2019 17:42:21 +0100



    Hello,

    
    I have two questions :

    
      I use OBJ_NAME_do_all_sorted() with  OBJ_NAME_TYPE_CIPHER_METH
        to get the list of supported cipher methods

        Is there a difference between lowercase and uppercase names ?

        I've noticed that some do not have uppercase name (ex.
        aes-128-ccm)

        Is there a prefered name to use ?

      
      In the case of GCM usage (with examples found in the OpenSSL
        wiki),

        Is the specific control action to set the tag on decryption can
        be done at the beginning rather than juste before
        EVP_DecryptFinal_ex() ?
    
    Thank you.

    Kind regards,

    Patrice.

    
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