Correct way to call the EVP_CIPHER_CTX_cleanup()

[tos iro]

Hello
I'm sorry when there is an impoliteness.

I want you to tell me a *correct way to* call the EVP_CIPHER_CTX_cleanup().

I'm writing the program for encrypt independent data one by one.

Should I call EVP_CIPHER_CTX_cleanup() at each EVP_EncryptFinal_ex() to
"Context"?
   function(){
       EVP_CIPHER_CTX    ctx;

       while( File exists ) {
           EVP_CIPHER_CTX_init( &ctx )
           EVP_CIPHER_CTX_set_padding( &ctx )
           EVP_EncryptInit_ex( &ctx )
           EVP_EncryptUpdate( &ctx )
           EVP_EncryptFinal_ex( &ctx )
           EVP_CIPHER_CTX_cleanup( &ctx )
       }
   }

Or, May I call the encryption processing repeatedly by once
EVP_CIPHER_CTX_init() and EVP_CIPHER_CTX_cleanup() to "Context"?
   function(){
       EVP_CIPHER_CTX    ctx;

       EVP_CIPHER_CTX_init( &ctx )
       EVP_CIPHER_CTX_set_padding( &ctx )
       while( File exists ) {
           EVP_EncryptInit_ex( &ctx )
           EVP_EncryptUpdate( &ctx )
           EVP_EncryptFinal_ex( &ctx )
       }
       EVP_CIPHER_CTX_cleanup( &ctx )
   }

I confirmed the above-mentioned both operated, too. However, I want to know
a correct specification,
but I worry about the meaning of the following sentence of manual.
   # EVP_CIPHER_CTX_cleanup() clears all information from a
   # cipher context and free up any allocated memory associate
   # with it. It should be called after all operations using a
   # cipher are complete so sensitive information does not remain
   # in memory.

I appreciate any comments and suggestions.
Regards
Tos