Re: [pdf-devel] [PATCH] Crypt filters

[David Vazquez]

Ok jemarch. I have written some examples for libgcrypt and I can do it
works incrementally, but we would change the crypt API. So, I propose
the following changes:

1. Edit crypt module (AESV2 only) in order to it doesn't pad the
   content.

2. Provide a function:

   void pdf_crypt_cipher_pad (CIPHER, OUT, OUT_SIZE, BUFFER, SIZE)

   Pad a buffer in memory. The new buffer is written in OUT.

3. Provide high level functions:

      pdf_status_t pdf_crypt_encrypt_buffer (ALGO, OUT, OUT_SIZE, IN, IN_SIZE);
      pdf_status_t pdf_crypt_decrypt_buffer (ALGO, OUT, OUT_SIZE, IN, IN_SIZE);

   which they work with a buffer in memory (with padding).


In this way, crypt filters only will need to use `pdf_crypt_cipher_pad'
in `finish_p'.


What do you think? If you agree, I write this.