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-.\" Copyright (c) 1999 - 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_encrypt.3 22071 2007-11-14 20:04:50Z lha $
-.\"
-.Dd March 20, 2004
-.Dt KRB5_ENCRYPT 3
-.Os HEIMDAL
-.Sh NAME
-.Nm krb5_crypto_getblocksize ,
-.Nm krb5_crypto_getconfoundersize
-.Nm krb5_crypto_getenctype ,
-.Nm krb5_crypto_getpadsize ,
-.Nm krb5_crypto_overhead ,
-.Nm krb5_decrypt ,
-.Nm krb5_decrypt_EncryptedData ,
-.Nm krb5_decrypt_ivec ,
-.Nm krb5_decrypt_ticket ,
-.Nm krb5_encrypt ,
-.Nm krb5_encrypt_EncryptedData ,
-.Nm krb5_encrypt_ivec ,
-.Nm krb5_enctype_disable ,
-.Nm krb5_enctype_keysize ,
-.Nm krb5_enctype_to_string ,
-.Nm krb5_enctype_valid ,
-.Nm krb5_get_wrapped_length ,
-.Nm krb5_string_to_enctype
-.Nd "encrypt and decrypt data, set and get encryption type parameters"
-.Sh LIBRARY
-Kerberos 5 Library (libkrb5, -lkrb5)
-.Sh SYNOPSIS
-.In krb5.h
-.Ft krb5_error_code
-.Fo krb5_encrypt
-.Fa "krb5_context context"
-.Fa "krb5_crypto crypto"
-.Fa "unsigned usage"
-.Fa "void *data"
-.Fa "size_t len"
-.Fa "krb5_data *result"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_encrypt_EncryptedData
-.Fa "krb5_context context"
-.Fa "krb5_crypto crypto"
-.Fa "unsigned usage"
-.Fa "void *data"
-.Fa "size_t len"
-.Fa "int kvno"
-.Fa "EncryptedData *result"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_encrypt_ivec
-.Fa "krb5_context context"
-.Fa "krb5_crypto crypto"
-.Fa "unsigned usage"
-.Fa "void *data"
-.Fa "size_t len"
-.Fa "krb5_data *result"
-.Fa "void *ivec"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_decrypt
-.Fa "krb5_context context"
-.Fa "krb5_crypto crypto"
-.Fa "unsigned usage"
-.Fa "void *data"
-.Fa "size_t len"
-.Fa "krb5_data *result"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_decrypt_EncryptedData
-.Fa "krb5_context context"
-.Fa "krb5_crypto crypto"
-.Fa "unsigned usage"
-.Fa "EncryptedData *e"
-.Fa "krb5_data *result"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_decrypt_ivec
-.Fa "krb5_context context"
-.Fa "krb5_crypto crypto"
-.Fa "unsigned usage"
-.Fa "void *data"
-.Fa "size_t len"
-.Fa "krb5_data *result"
-.Fa "void *ivec"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_decrypt_ticket
-.Fa "krb5_context context"
-.Fa "Ticket *ticket"
-.Fa "krb5_keyblock *key"
-.Fa "EncTicketPart *out"
-.Fa "krb5_flags flags"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_crypto_getblocksize
-.Fa "krb5_context context"
-.Fa "size_t *blocksize"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_crypto_getenctype
-.Fa "krb5_context context"
-.Fa "krb5_crypto crypto"
-.Fa "krb5_enctype *enctype"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_crypto_getpadsize
-.Fa "krb5_context context"
-.Fa size_t *padsize"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_crypto_getconfoundersize
-.Fa "krb5_context context"
-.Fa "krb5_crypto crypto
-.Fa size_t *confoundersize"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_enctype_keysize
-.Fa "krb5_context context"
-.Fa "krb5_enctype type"
-.Fa "size_t *keysize"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_crypto_overhead
-.Fa "krb5_context context"
-.Fa size_t *padsize"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_string_to_enctype
-.Fa "krb5_context context"
-.Fa "const char *string"
-.Fa "krb5_enctype *etype"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_enctype_to_string
-.Fa "krb5_context context"
-.Fa "krb5_enctype etype"
-.Fa "char **string"
-.Fc
-.Ft krb5_error_code
-.Fo krb5_enctype_valid
-.Fa "krb5_context context"
-.Fa "krb5_enctype etype"
-.Fc
-.Ft void
-.Fo krb5_enctype_disable
-.Fa "krb5_context context"
-.Fa "krb5_enctype etype"
-.Fc
-.Ft size_t
-.Fo krb5_get_wrapped_length
-.Fa "krb5_context context"
-.Fa "krb5_crypto crypto"
-.Fa "size_t data_len"
-.Fc
-.Sh DESCRIPTION
-These functions are used to encrypt and decrypt data.
-.Pp
-.Fn krb5_encrypt_ivec
-puts the encrypted version of
-.Fa data
-(of size
-.Fa len )
-in
-.Fa result .
-If the encryption type supports using derived keys,
-.Fa usage
-should be the appropriate key-usage.
-.Fa ivec
-is a pointer to a initial IV, it is modified to the end IV at the end of
-the round.
-Ivec should be the size of 
-If
-.Dv NULL
-is passed in, the default IV is used.
-.Fn krb5_encrypt
-does the same as
-.Fn krb5_encrypt_ivec
-but with
-.Fa ivec
-being
-.Dv NULL .
-.Fn krb5_encrypt_EncryptedData
-does the same as
-.Fn krb5_encrypt ,
-but it puts the encrypted data in a
-.Fa EncryptedData
-structure instead. If
-.Fa kvno
-is not zero, it will be put in the (optional)
-.Fa kvno
-field in the
-.Fa EncryptedData .
-.Pp
-.Fn krb5_decrypt_ivec ,
-.Fn krb5_decrypt ,
-and
-.Fn krb5_decrypt_EncryptedData
-works similarly.
-.Pp
-.Fn krb5_decrypt_ticket
-decrypts the encrypted part of 
-.Fa ticket
-with
-.Fa key .
-.Fn krb5_decrypt_ticket
-also verifies the timestamp in the ticket, invalid flag and if the KDC
-haven't verified the transited path, the transit path.
-.Pp
-.Fn krb5_enctype_keysize ,
-.Fn krb5_crypto_getconfoundersize ,
-.Fn krb5_crypto_getblocksize ,
-.Fn krb5_crypto_getenctype ,
-.Fn krb5_crypto_getpadsize ,
-.Fn krb5_crypto_overhead
-all returns various (sometimes) useful information from a crypto context.
-.Fn krb5_crypto_overhead
-is the combination of krb5_crypto_getconfoundersize,
-krb5_crypto_getblocksize and krb5_crypto_getpadsize and return the
-maximum overhead size.
-.Pp
-.Fn krb5_enctype_to_string
-converts a encryption type number to a string that can be printable
-and stored. The strings returned should be freed with
-.Xr free 3 .
-.Pp
-.Fn krb5_string_to_enctype
-converts a encryption type strings to a encryption type number that
-can use used for other Kerberos crypto functions.
-.Pp
-.Fn krb5_enctype_valid
-returns 0 if the encrypt is supported and not disabled, otherwise and
-error code is returned.
-.Pp
-.Fn krb5_enctype_disable
-(globally, for all contextes) disables the
-.Fa enctype .
-.Pp
-.Fn krb5_get_wrapped_length
-returns the size of an encrypted packet by
-.Fa crypto
-of length
-.Fa data_len .
-.\" .Sh EXAMPLE
-.\" .Sh BUGS
-.Sh SEE ALSO
-.Xr krb5_create_checksum 3 ,
-.Xr krb5_crypto_init 3