1 files changed, 82 insertions, 0 deletions
diff --git a/subversion/libsvn_subr/sha1.c b/subversion/libsvn_subr/sha1.c
new file mode 100644
index 0000000..45470cb
--- /dev/null
+++ b/subversion/libsvn_subr/sha1.c
@@ -0,0 +1,82 @@
+/*
+ * 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));
+}