0caadd8b18
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@12329 ec53bebd-3082-4978-b11e-865c3cabbd6b
96 lines
3.6 KiB
Groff
96 lines
3.6 KiB
Groff
.\" Copyright (c) 1999 Kungliga Tekniska Högskolan
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.\" (Royal Institute of Technology, Stockholm, Sweden).
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" 3. Neither the name of the Institute nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id$
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.\"
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.Dd April 7, 1999
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.Dt NAME 3
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.Os HEIMDAL
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.Sh NAME
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.Nm krb5_checksum_is_collision_proof ,
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.Nm krb5_checksum_is_keyed ,
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.Nm krb5_checksumsize ,
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.Nm krb5_create_checksum ,
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.Nm krb5_verify_checksum
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.Nd creates and verifies checksums
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.Sh LIBRARY
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Kerberos 5 Library (libkrb5, -lkrb5)
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.Sh SYNOPSIS
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.In krb5.h
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.Ft krb5_error_code
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.Fn krb5_create_checksum "krb5_context context" "krb5_crypto crypto" "unsigned usage_or_type" "void *data" "size_t len" "Checksum *result"
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.Ft krb5_error_code
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.Fn krb5_verify_checksum "krb5_context context" "krb5_crypto crypto" "krb5_key_usage usage" "void *data" "size_t len" "Checksum *cksum"
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.Ft krb5_boolean
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.Fn krb5_checksum_is_collision_proof "krb5_context context" "krb5_cksumtype type"
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.Ft krb5_boolean
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.Fn krb5_checksum_is_keyed "krb5_context context" "krb5_cksumtype type"
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.Sh DESCRIPTION
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These functions are used to create and verify checksums.
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.Fn krb5_create_checksum
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creates a checksum of the specified data, and puts it in
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.Fa result .
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If
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.Fa crypto
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is
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.Dv NULL ,
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.Fa usage_or_type
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specifies the checksum type to use; it must not be keyed. Otherwise
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.Fa crypto
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is an encryption context created by
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.Fn krb5_crypto_init ,
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and
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.Fa usage_or_type
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specifies a key-usage.
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.Pp
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.Fn krb5_verify_checksum
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verifies the
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.Fa checksum ,
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against the provided data.
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.Pp
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.Fn krb5_checksum_is_collision_proof
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returns true is the specified checksum is collision proof (that it's
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very unlikely that two strings has the same hash value, and that it's
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hard to find two strings that has the same hash). Examples of
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collision proof checksums are MD5, and SHA1, while CRC32 is not.
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.Pp
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.Fn krb5_checksum_is_keyed
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returns true if the specified checksum type is keyed (that the hash
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value is a function of both the data, and a separate key). Examples of
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keyed hash algorithms are HMAC-SHA1-DES3, and RSA-MD5-DES. The
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.Dq plain
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hash functions MD5, and SHA1 are not keyed.
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.\" .Sh EXAMPLE
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.\" .Sh BUGS
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.Sh SEE ALSO
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.Xr krb5_crypto_init 3 ,
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.Xr krb5_encrypt 3
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