| /* |
| * sha1.c: SHA1 checksum routines |
| * |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * ==================================================================== |
| */ |
| |
| #include <apr_sha1.h> |
| |
| #include "sha1.h" |
| |
| |
| |
| /* The SHA1 digest for the empty string. */ |
| static const unsigned char svn_sha1__empty_string_digest_array[] = { |
| 0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d, 0x32, 0x55, |
| 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90, 0xaf, 0xd8, 0x07, 0x09 |
| }; |
| |
| const unsigned char * |
| svn_sha1__empty_string_digest(void) |
| { |
| return svn_sha1__empty_string_digest_array; |
| } |
| |
| |
| const char * |
| svn_sha1__digest_to_cstring_display(const unsigned char digest[], |
| apr_pool_t *pool) |
| { |
| static const char *hex = "0123456789abcdef"; |
| char *str = apr_palloc(pool, (APR_SHA1_DIGESTSIZE * 2) + 1); |
| int i; |
| |
| for (i = 0; i < APR_SHA1_DIGESTSIZE; i++) |
| { |
| str[i*2] = hex[digest[i] >> 4]; |
| str[i*2+1] = hex[digest[i] & 0x0f]; |
| } |
| str[i*2] = '\0'; |
| |
| return str; |
| } |
| |
| |
| const char * |
| svn_sha1__digest_to_cstring(const unsigned char digest[], apr_pool_t *pool) |
| { |
| static const unsigned char zeros_digest[APR_SHA1_DIGESTSIZE] = { 0 }; |
| |
| if (memcmp(digest, zeros_digest, APR_SHA1_DIGESTSIZE) != 0) |
| return svn_sha1__digest_to_cstring_display(digest, pool); |
| else |
| return NULL; |
| } |
| |
| |
| svn_boolean_t |
| svn_sha1__digests_match(const unsigned char d1[], const unsigned char d2[]) |
| { |
| static const unsigned char zeros[APR_SHA1_DIGESTSIZE] = { 0 }; |
| |
| return ((memcmp(d1, zeros, APR_SHA1_DIGESTSIZE) == 0) |
| || (memcmp(d2, zeros, APR_SHA1_DIGESTSIZE) == 0) |
| || (memcmp(d1, d2, APR_SHA1_DIGESTSIZE) == 0)); |
| } |