(Copyright): Added copyright information for

serpent.
(Miscellaneous functions): Started writing documentation on the CBC
functions.

Rev: src/nettle/nettle.texinfo:1.3

nettle.texinfo

@@ -185,7 +185,7 @@ Released into the public domain.
 @item SERPENT
 The implementation of the SERPENT cipher is written by Ross Anderson,
 Eli Biham, and Lars Knudsen, adapted to LSH by Rafael Sevilla, and to
-Nettle by Niels Möller.
+Nettle by Niels Möller. Released under the GPL.
 
 @item SHA1
 The implementation of the SHA1 message digest is written by Peter
@@ -441,7 +441,7 @@ However, using ECB is usually a bad idea. For a start, plaintext blocks
 that are equal are transformed to ciphertext blocks that are equal; that
 leaks information about the plaintext. Usually you should apply the
 cipher is some feedback mode, @dfn{CBC} (Cipher Block Chaining) being one
-of the most popular.
+of the most popular. XXX Add reference 
 
 A stream cipher can be used for messages of arbitrary length; a typical
 stream cipher is a keyed pseudorandom generator. To encrypt a plaintext
@@ -809,6 +809,18 @@ doesn't follow the Nettle conventions, because it is intended to be
 similar to the ANSI-C @code{memcpy} function.
 @end deftypefun
 
+@deftypefun {void} cbc_encrypt (void *@var{ctx}, void (*@var{f})(), unsigned @var{block_size}, uint8_t *@var{iv}, unsigned @var{length}, uint8_t *@var{dst}, const uint8_t *@var{src})
+@deftypefunx {void} cbc_decrypt (void *@var{ctx}, void (*@var{f})(), unsigned @var{block_size}, uint8_t *@var{iv}, unsigned @var{length}, uint8_t *@var{dst}, const uint8_t *@var{src})
+Utility functions for applying a block cipher in Cipher Block Chaining
+(CBC) mode. The function f is really typed as @code{void f (void
+*@var{ctx}, unsigned @var{length}, uint8_t @var{dst}, const uint8_t
+*@var{src}), and the @code{cbc_encrypt} and @code{cbc_decrypt} functions
+pass their argument @var{ctx} on to @code{f}.
+
+There are also some macros to help use these functions correctly, XXX
+describe CBC_SET_IV, CBC_ENCRYPT and CBC_DECRYPT.
+
+@end example
 @node Installation, Index, Reference, Top
 @comment  node-name,  next,  previous,  up
 @chapter Installation