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