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-.\" Copyright (c) 2003 - 2004 Kungliga Tekniska Högskolan
-.\" (Royal Institute of Technology, Stockholm, Sweden).
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" 3. Neither the name of the Institute nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $Id: krb5_keyblock.3 17385 2006-05-01 08:48:55Z lha $
-.\"
-.Dd May  1, 2006
-.Dt KRB5_KEYBLOCK 3
-.Os HEIMDAL
-.Sh NAME
-.Nm krb5_keyblock ,
-.Nm krb5_keyblock_get_enctype ,
-.Nm krb5_copy_keyblock ,
-.Nm krb5_copy_keyblock_contents ,
-.Nm krb5_free_keyblock ,
-.Nm krb5_free_keyblock_contents ,
-.Nm krb5_generate_random_keyblock ,
-.Nm krb5_generate_subkey ,
-.Nm krb5_generate_subkey_extended ,
-.Nm krb5_keyblock_init ,
-.Nm krb5_keyblock_zero ,
-.Nm krb5_random_to_key
-.Nd Kerberos 5 key handling functions
-.Sh LIBRARY
-Kerberos 5 Library (libkrb5, -lkrb5)
-.Sh SYNOPSIS
-.In krb5.h
-.Pp
-.Li krb5_keyblock ;
-.Ft krb5_enctype
-.Fo krb5_keyblock_get_enctype
-.Fa "const krb5_keyblock *block"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_copy_keyblock
-.Fa "krb5_context context"
-.Fa "krb5_keyblock **to"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_copy_keyblock_contents
-.Fa "krb5_context context"
-.Fa "const krb5_keyblock *inblock"
-.Fa "krb5_keyblock *to"
-.Fc
-.Ft void
-.Fo krb5_free_keyblock
-.Fa "krb5_context context"
-.Fa "krb5_keyblock *keyblock"
-.Fc
-.Ft void
-.Fo krb5_free_keyblock_contents
-.Fa "krb5_context context"
-.Fa "krb5_keyblock *keyblock"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_generate_random_keyblock
-.Fa "krb5_context context"
-.Fa "krb5_enctype type"
-.Fa "krb5_keyblock *key"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_generate_subkey
-.Fa "krb5_context context"
-.Fa "const krb5_keyblock *key"
-.Fa "krb5_keyblock **subkey"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_generate_subkey_extended
-.Fa "krb5_context context"
-.Fa "const krb5_keyblock *key"
-.Fa "krb5_enctype enctype"
-.Fa "krb5_keyblock **subkey"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_keyblock_init
-.Fa "krb5_context context"
-.Fa "krb5_enctype type"
-.Fa "const void *data"
-.Fa "size_t size"
-.Fa "krb5_keyblock *key"
-.Fc
-.Ft void
-.Fo krb5_keyblock_zero
-.Fa "krb5_keyblock *keyblock"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_random_to_key
-.Fa "krb5_context context"
-.Fa "krb5_enctype type"
-.Fa "const void *data"
-.Fa "size_t size"
-.Fa "krb5_keyblock *key"
-.Fc
-.Sh DESCRIPTION
-.Li krb5_keyblock
-holds the encryption key for a specific encryption type.
-There is no component inside
-.Li krb5_keyblock
-that is directly referable.
-.Pp
-.Fn krb5_keyblock_get_enctype
-returns the encryption type of the keyblock.
-.Pp
-.Fn krb5_copy_keyblock
-makes a copy the keyblock
-.Fa inblock
-to the
-output
-.Fa out .
-.Fa out
-should be freed by the caller with
-.Fa krb5_free_keyblock .
-.Pp
-.Fn krb5_copy_keyblock_contents
-copies the contents of
-.Fa inblock
-to the
-.Fa to
-keyblock.
-The destination keyblock is overritten.
-.Pp
-.Fn krb5_free_keyblock
-zeros out and frees the content and the keyblock itself.
-.Pp
-.Fn krb5_free_keyblock_contents
-zeros out and frees the content of the keyblock.
-.Pp
-.Fn krb5_generate_random_keyblock
-creates a new content of the keyblock
-.Fa key
-of type encrytion type
-.Fa type .
-The content of
-.Fa key
-is overwritten and not freed, so the caller should be sure it is
-freed before calling the function.
-.Pp
-.Fn krb5_generate_subkey
-generates a
-.Fa subkey
-of the same type as
-.Fa key .
-The caller must free the subkey with
-.Fa krb5_free_keyblock .
-.Pp
-.Fn krb5_generate_subkey_extended
-generates a
-.Fa subkey
-of the specified encryption type
-.Fa type .
-If
-.Fa type
-is
-.Dv ETYPE_NULL ,
-of the same type as
-.Fa key .
-The caller must free the subkey with
-.Fa krb5_free_keyblock .
-.Pp
-.Fn krb5_keyblock_init
-Fill in
-.Fa key
-with key data of type
-.Fa enctype
-from 
-.Fa data
-of length
-.Fa size .
-Key should be freed using
-.Fn krb5_free_keyblock_contents .
-.Pp
-.Fn krb5_keyblock_zero
-zeros out the keyblock to to make sure no keymaterial is in
-memory.
-Note that
-.Fn krb5_free_keyblock_contents
-also zeros out the memory.
-.Pp
-.Fn krb5_random_to_key
-converts the random bytestring to a protocol key according to Kerberos
-crypto frame work.
-It the resulting key will be of type
-.Fa enctype .
-It may be assumed that all the bits of the input string are equally
-random, even though the entropy present in the random source may be
-limited
-.\" .Sh EXAMPLES
-.Sh SEE ALSO
-.Xr krb5_crypto_init 3 ,
-.Xr krb5 3 ,
-.Xr krb5.conf 5