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-Kerberos v5 has the ability to use multiple encryption systems.  Any
-encryption system which desires to link with and be usable from the MIT
-Kerberos v5 implementation must implement at least this interface:
-
-\subsection{Functional interface}
-
-\begin{funcdecl}{encrypt_func}{krb5_error_code}{\funcvoid}
-\funcarg{krb5_const_pointer}{in}
-\funcarg{krb5_pointer}{out}
-\funcarg{const size_t}{size}
-\funcarg{krb5_encrypt_block *}{eblock}
-\funcarg{krb5_pointer}{ivec}
-\end{funcdecl}
-Encrypts \funcparam{size} bytes at \funcparam{in}, storing result in
-\funcparam{out}.  \funcparam{eblock} points to an encrypt block which
-has been initialized by \funcname{process_key}.
-
-\funcparam{in} must include sufficient space beyond the \funcparam{size}
-bytes of input data to hold pad and redundancy check bytes; the macro
-\funcname{krb5_encrypt_size} can be used to compute this size.
-
-\funcparam{out} must be preallocated by the caller to contain sufficient
-storage to hold the output; the macro \funcname{krb5_encrypt_size} can
-be used to compute this size.
-
-\funcparam{ivec} points to an initial vector/seed to be used in the encryption.
-If null, the cryptosystem may choose an appropriate initialization vector.
-
-%Errors: Returns errors.
-
-\begin{funcdecl}{decrypt_func}{krb5_error_code}{\funcvoid}
-\funcarg{krb5_const_pointer}{in}
-\funcarg{krb5_pointer}{out}
-\funcarg{const size_t}{size}
-\funcarg{krb5_encrypt_block *}{eblock}
-\funcarg{krb5_pointer}{ivec}
-\end{funcdecl}
-Decrypts \funcparam{size} bytes at \funcparam{in}, storing result in
-\funcparam{out}.
-\funcparam{eblock} points to an encrypt block which has been initialized
-by \funcname{process_key}.
-
-\funcparam{size} must be a multiple of the encryption block size.
-
-\funcparam{out} must be preallocated by the caller to contain sufficient
-storage to hold the output; this is guaranteed to be no more than
-the input size.
-
-\funcparam{ivec} points to an initial vector/seed to be used in the decryption.
-If null, the cryptosystem may choose an appropriate ivec.
-
-%Errors: Returns errors.
-
-\begin{funcdecl}{process_key}{krb5_error_code}{\funcvoid}
-\funcarg{krb5_encrypt_block *}{eblock}
-\funcarg{const krb5_keyblock *}{keyblock}
-\end{funcdecl}
-Does any necessary key preprocessing (such as computing key
-schedules for DES).
-\funcparam{eblock{\ptsto}crypto_entry} must be set by the caller; the
-other elements of \funcparam{eblock} are to be assigned by this function.
-[In particular, \funcparam{eblock{\ptsto}key} must be set by this
-function if the key is needed in raw form by the encryption routine.]
-
-The caller may not move or reallocate \funcparam{keyblock} before calling
-\funcname{finish_key} on \funcparam{eblock}.
-
-%Errors: Returns errors.
-
-\begin{funcdecl}{finish_key}{krb5_error_code}{\funcvoid}
-\funcarg{krb5_encrypt_block *}{eblock}
-\end{funcdecl}
-Does any necessary clean-up on \funcparam{eblock} (such as releasing
-resources held by \funcparam{eblock{\ptsto}priv}.
-
-%Errors: Returns errors.
-
-\begin{funcdecl}{string_to_key}{krb5_error_code}{\funcvoid}
-\funcarg{const krb5_keytype}{keytype}
-\funcarg{krb5_keyblock *}{keyblock}
-\funcarg{const krb5_data *}{data}
-\funcarg{const krb5_data}{salt}
-\end{funcdecl}
-Converts the string pointed to by \funcparam{data} into an encryption key
-of type \funcparam{keytype}.  \funcparam{*keyblock} is filled in with
-the key info; in particular, \funcparam{keyblock{\ptsto}contents} is to
-be set to allocated storage. It is the responsibility of the caller to
-release this storage when the generated key no longer needed.
-
-The routine may use \funcparam{salt} to seed or alter the conversion
-algorithm.
-
-If the particular function called does not know how to make a
-key of type \funcparam{keytype}, an error may be returned.
-
-%Errors: Returns errors.
-
-\begin{funcdecl}{init_random_key}{krb5_error_code}{\funcvoid}
-\funcarg{const krb5_keyblock *}{seedblock}
-\funcarg{krb5_pointer *}{seed}
-\end{funcdecl}
-
-Initialize the random key generator using the encryption key
-\funcparam{seedblock} and allocating private sequence information, filling
-in \funcparam{*seed} with the address of such information.
-\funcparam{*seed} is to be passed to \funcname{random_key} to provide
-sequence information.
-
-\begin{funcdecl}{finish_random_key}{krb5_error_code}{\funcvoid}
-\funcarg{krb5_pointer *}{seed}
-\end{funcdecl}
-
-Free any resources held by \funcparam{seed} and assigned by
-\funcname{init_random_key}. 
-
-\begin{funcdecl}{random_key}{krb5_error_code}{\funcvoid}
-\funcarg{krb5_pointer *}{seed}
-\funcarg{krb5_keyblock **}{keyblock}
-\end{funcdecl}
-
-Generate a random encryption key, allocating storage for it and
-filling in the keyblock address in \funcparam{*keyblock}.
-When the caller has finished using the keyblock, he should call
-\funcname{krb5_free_keyblock} to release its storage.
-
-%\begin{funcdecl}{combine_keys}{krb5_error_code}{\funcin}
-%\funcarg{const krb5_keyblock *}{key1}
-%\funcarg{const krb5_keyblock *}{key2}
-%\funcout
-%\funcarg{krb5_keyblock **}{outkey}
-%\end{funcdecl}
-%Combine the two encryption keys \funcparam{key1} and \funcparam{key2} to
-%generate a new output key \funcparam{outkey}.  \funcparam{outkey} is
-%filled in to point to the freshly-allocated key.  When the caller is
-%finished using the \funcparam{*outkey}, it should be freed with
-%\funcname{krb5_free_keyblock}.
-
-\subsection{Other data elements}
-In addition to the above listed function entry points, each encryption
-system should have an entry in \globalname{krb5_csarray} and a
-\datatype{krb5_cryptosystem_entry} structure describing the entry points
-and key and padding sizes for the encryption system.
-
-\subsection{DES functions}
-The DES functions conform to the encryption interface required by the
-Kerberos version 5 library, and provide an encryption mechanism based on
-the DES Cipher-block chaining mode (CBC), with the addition of a
-cyclical redundancy check (CRC-32) for integrity checking upon
-decryption.
-
-The functions have the same signatures as those described by the main
-library document; the names are:
-{\obeylines
-\funcname{mit_des_encrypt_func}
-\funcname{mit_des_decrypt_func}
-\funcname{mit_des_process_key}
-\funcname{mit_des_finish_key}
-\funcname{mit_des_string_to_key}
-\funcname{mit_des_init_random_key}
-\funcname{mit_des_finish_random_key}
-\funcname{mit_des_random_key}
-}
-The \datatype{krb5_cryptosystem_entry} for this cryptosystem is
-\globalname{mit_des_cryptosystem_entry}.