src/TortoiseMerge/libsvn_diff/sha1.h

   1 /*
   2  * sha1.h: Converting and comparing SHA1 checksums
   3  *
   4  * ====================================================================
   5  *    Licensed to the Apache Software Foundation (ASF) under one
   6  *    or more contributor license agreements.  See the NOTICE file
   7  *    distributed with this work for additional information
   8  *    regarding copyright ownership.  The ASF licenses this file
   9  *    to you under the Apache License, Version 2.0 (the
  10  *    "License"); you may not use this file except in compliance
  11  *    with the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  *    Unless required by applicable law or agreed to in writing,
  16  *    software distributed under the License is distributed on an
  17  *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  18  *    KIND, either express or implied.  See the License for the
  19  *    specific language governing permissions and limitations
  20  *    under the License.
  21  * ====================================================================
  22  */
  23
  24 #ifndef SVN_LIBSVN_SUBR_SHA1_H
  25 #define SVN_LIBSVN_SUBR_SHA1_H
  26
  27 #include <apr_pools.h>
  28 #include "svn_types.h"
  29
  30 #ifdef __cplusplus
  31 extern "C" {
  32 #endif /* __cplusplus */
  33
  34 \f
  35
  36 /* The SHA1 digest for the empty string. */
  37 const unsigned char *
  38 svn_sha1__empty_string_digest(void);
  39
  40
  41 /* Return the hex representation of DIGEST, which must be
  42  * APR_SHA1_DIGESTSIZE bytes long, allocating the string in POOL.
  43  */
  44 const char *
  45 svn_sha1__digest_to_cstring_display(const unsigned char digest[],
  46                                     apr_pool_t *pool);
  47
  48
  49 /* Return the hex representation of DIGEST, which must be
  50  * APR_SHA1_DIGESTSIZE bytes long, allocating the string in POOL.
  51  * If DIGEST is all zeros, then return NULL.
  52  */
  53 const char *
  54 svn_sha1__digest_to_cstring(const unsigned char digest[],
  55                             apr_pool_t *pool);
  56
  57
  58 /** Compare digests D1 and D2, each APR_SHA1_DIGESTSIZE bytes long.
  59  * If neither is all zeros, and they do not match, then return FALSE;
  60  * else return TRUE.
  61  */
  62 svn_boolean_t
  63 svn_sha1__digests_match(const unsigned char d1[],
  64                         const unsigned char d2[]);
  65
  66 #ifdef __cplusplus
  67 }
  68 #endif /* __cplusplus */
  69
  70 #endif /* SVN_LIBSVN_SUBR_SHA1_H */