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-.\" Copyright (c) 2003 - 2006 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_c_make_checksum.3 19066 2006-11-17 22:09:25Z lha $
-.\"
-.Dd Nov  17, 2006
-.Dt KRB5_C_MAKE_CHECKSUM 3
-.Os HEIMDAL
-.Sh NAME
-.Nm krb5_c_block_size ,
-.Nm krb5_c_decrypt ,
-.Nm krb5_c_encrypt ,
-.Nm krb5_c_encrypt_length ,
-.Nm krb5_c_enctype_compare ,
-.Nm krb5_c_get_checksum ,
-.Nm krb5_c_is_coll_proof_cksum ,
-.Nm krb5_c_is_keyed_cksum ,
-.Nm krb5_c_keylength ,
-.Nm krb5_c_make_checksum ,
-.Nm krb5_c_make_random_key ,
-.Nm krb5_c_set_checksum ,
-.Nm krb5_c_valid_cksumtype ,
-.Nm krb5_c_valid_enctype ,
-.Nm krb5_c_verify_checksum ,
-.Nm krb5_c_checksum_length
-.Nd Kerberos 5 crypto API
-.Sh LIBRARY
-Kerberos 5 Library (libkrb5, -lkrb5)
-.Sh SYNOPSIS
-.In krb5.h
-.Pp
-.Ft krb5_error_code
-.Fo krb5_c_block_size
-.Fa "krb5_context context"
-.Fa "krb5_enctype enctype"
-.Fa "size_t *blocksize"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_decrypt
-.Fa "krb5_context context"
-.Fa "const krb5_keyblock key"
-.Fa "krb5_keyusage usage"
-.Fa "const krb5_data *ivec"
-.Fa "krb5_enc_data *input"
-.Fa "krb5_data *output"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_encrypt
-.Fa "krb5_context context"
-.Fa "const krb5_keyblock *key"
-.Fa "krb5_keyusage usage"
-.Fa "const krb5_data *ivec"
-.Fa "const krb5_data *input"
-.Fa "krb5_enc_data *output"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_encrypt_length
-.Fa "krb5_context context"
-.Fa "krb5_enctype enctype"
-.Fa "size_t inputlen"
-.Fa "size_t *length"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_enctype_compare
-.Fa "krb5_context context"
-.Fa "krb5_enctype e1"
-.Fa "krb5_enctype e2"
-.Fa "krb5_boolean *similar"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_make_random_key
-.Fa "krb5_context context"
-.Fa "krb5_enctype enctype"
-.Fa "krb5_keyblock *random_key"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_make_checksum
-.Fa "krb5_context context"
-.Fa "krb5_cksumtype cksumtype"
-.Fa "const krb5_keyblock *key"
-.Fa "krb5_keyusage usage"
-.Fa "const krb5_data *input"
-.Fa "krb5_checksum *cksum"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_verify_checksum
-.Fa "krb5_context context
-.Fa "const krb5_keyblock *key"
-.Fa "krb5_keyusage usage"
-.Fa "const krb5_data *data"
-.Fa "const krb5_checksum *cksum"
-.Fa "krb5_boolean *valid"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_checksum_length
-.Fa "krb5_context context"
-.Fa "krb5_cksumtype cksumtype"
-.Fa "size_t *length"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_get_checksum
-.Fa "krb5_context context"
-.Fa "const krb5_checksum *cksum"
-.Fa "krb5_cksumtype *type"
-.Fa "krb5_data **data"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_set_checksum
-.Fa "krb5_context context"
-.Fa "krb5_checksum *cksum"
-.Fa "krb5_cksumtype type"
-.Fa "const krb5_data *data"
-.Fc
-.Ft krb5_boolean
-.Fo krb5_c_valid_enctype
-.Fa krb5_enctype etype"
-.Fc
-.Ft krb5_boolean
-.Fo krb5_c_valid_cksumtype
-.Fa "krb5_cksumtype ctype"
-.Fc
-.Ft krb5_boolean
-.Fo krb5_c_is_coll_proof_cksum
-.Fa "krb5_cksumtype ctype"
-.Fc
-.Ft krb5_boolean
-.Fo krb5_c_is_keyed_cksum
-.Fa "krb5_cksumtype ctype"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_c_keylengths
-.Fa "krb5_context context"
-.Fa "krb5_enctype enctype"
-.Fa "size_t *inlength"
-.Fa "size_t *keylength"
-.Fc
-.Sh DESCRIPTION
-The functions starting with krb5_c are compat functions with MIT kerberos.
-.Pp
-The
-.Li krb5_enc_data
-structure holds and encrypted data.
-There are two public accessable members of
-.Li krb5_enc_data .
-.Li enctype
-that holds the encryption type of the data encrypted and
-.Li ciphertext
-that is a
-.Ft krb5_data
-that might contain the encrypted data.
-.Pp
-.Fn krb5_c_block_size
-returns the blocksize of the encryption type.
-.Pp
-.Fn krb5_c_decrypt
-decrypts
-.Fa input
-and store the data in
-.Fa output.
-If 
-.Fa ivec
-is
-.Dv NULL
-the default initialization vector for that encryption type will be used.
-.Pp
-.Fn krb5_c_encrypt
-encrypts the plaintext in
-.Fa input
-and store the ciphertext in
-.Fa output .
-.Pp
-.Fn krb5_c_encrypt_length
-returns the length the encrypted data given the plaintext length.
-.Pp
-.Fn krb5_c_enctype_compare
-compares to encryption types and returns if they use compatible
-encryption key types.
-.Pp
-.Fn krb5_c_make_checksum
-creates a checksum
-.Fa cksum
-with the checksum type
-.Fa cksumtype
-of the data in
-.Fa data .
-.Fa key
-and
-.Fa usage
-are used if the checksum is a keyed checksum type.
-Returns 0 or an error code.
-.Pp
-.Fn krb5_c_verify_checksum
-verifies the checksum
-of
-.Fa data
-in
-.Fa cksum
-that was created with
-.Fa key
-using the key usage
-.Fa usage .
-.Fa verify
-is set to non-zero if the checksum verifies correctly and zero if not.
-Returns 0 or an error code.
-.Pp
-.Fn krb5_c_checksum_length
-returns the length of the checksum.
-.Pp
-.Fn krb5_c_set_checksum
-sets the
-.Li krb5_checksum
-structure given
-.Fa type
-and
-.Fa data .
-The content of
-.Fa cksum
-should be freeed with
-.Fn krb5_c_free_checksum_contents .
-.Pp
-.Fn krb5_c_get_checksum
-retrieves the components of the
-.Li krb5_checksum .
-structure.
-.Fa data
-should be free with
-.Fn krb5_free_data .
-If some either of
-.Fa data
-or
-.Fa checksum
-is not needed for the application, 
-.Dv NULL
-can be passed in.
-.Pp
-.Fn krb5_c_valid_enctype
-returns true if
-.Fa etype
-is a valid encryption type.
-.Pp
-.Fn krb5_c_valid_cksumtype
-returns true if
-.Fa ctype
-is a valid checksum type.
-.Pp
-.Fn krb5_c_is_keyed_cksum
-return true if
-.Fa ctype
-is a keyed checksum type.
-.Pp
-.Fn krb5_c_is_coll_proof_cksum
-returns true if
-.Fa ctype
-is a collition proof checksum type.
-.Pp
-.Fn krb5_c_keylengths
-return the minimum length (
-.Fa inlength )
-bytes needed to create a key and the
-length (
-.Fa keylength )
-of the resulting key
-for the
-.Fa enctype .
-.Sh SEE ALSO
-.Xr krb5 3 ,
-.Xr krb5_create_checksum 3 ,
-.Xr krb5_free_data 3 ,
-.Xr kerberos 8