Author: rinrab
Date: Wed Feb 25 07:55:18 2026
New Revision: 1932040
Log:
Support xdigest checksum backend.
This library is a collection of OpenSSL's checksum algorithm implementations
with focus on performance and simplicity. In other words, it brings the same
performance improvent as OpenSSL but is built to be lightweight.
This feature remains experemental and optional. The current default backend is
APR. Users are expected to explicitly change it if they want to.
* CMakeLists.txt
(SVN_CHECKSUM_BACKEND): Add xdigest to the list of allowed values.
(xdigest): Look for the library if this backend is requested.
* build/cmake/FindXDIGEST.cmake: New module that performs the search.
* subversion/libsvn_subr/checksum_xdigest.c: New backend. Effectivily a copy of
OpenSSL backend, with some tweaks and replace of the backend itself.
(init_status): Declare global state for atomic initilization.
(xdigest_init_once, ensure_xdigest_init): New function to perform library
initilization.
(svn_checksum__md5_ctx_reset, svn_checksum__md5_ctx_update,
svn_checksum__md5_ctx_final, svn_checksum__sha1_ctx_reset,
svn_checksum__sha1_ctx_update, svn_checksum__sha1_ctx_final): Implement the
backend.
Added:
subversion/trunk/build/cmake/FindXDIGEST.cmake
subversion/trunk/subversion/libsvn_subr/checksum_xdigest.c (contents,
props changed)
Modified:
subversion/trunk/CMakeLists.txt
Modified: subversion/trunk/CMakeLists.txt
==============================================================================
--- subversion/trunk/CMakeLists.txt Wed Feb 25 07:28:27 2026
(r1932039)
+++ subversion/trunk/CMakeLists.txt Wed Feb 25 07:55:18 2026
(r1932040)
@@ -114,8 +114,8 @@ cmake_dependent_option(SVN_BUILD_SHARED_
option(SVN_DEBUG "Enables specific features for developer builds" OFF)
cmake_dependent_option(SVN_USE_WIN32_CRASHHANDLER "Enables WIN32 crash
handler." ON "WIN32" OFF)
option(SVN_USE_DSO "Defined if svn should try to load DSOs" OFF)
-set(SVN_CHECKSUM_BACKEND "apr" CACHE STRING "Checksum backend to use (possible
values are 'apr', 'openssl', or 'bcrypt')" )
-set_property(CACHE SVN_CHECKSUM_BACKEND PROPERTY STRINGS "apr" "openssl"
"bcrypt")
+set(SVN_CHECKSUM_BACKEND "apr" CACHE STRING "Checksum backend to use (possible
values are 'apr', 'openssl', 'bcrypt', 'xdigest')" )
+set_property(CACHE SVN_CHECKSUM_BACKEND PROPERTY STRINGS "apr" "openssl"
"bcrypt" "xdigest")
set(SVN_SOVERSION "0" CACHE STRING "Subversion library ABI version")
mark_as_advanced(SVN_SOVERSION)
@@ -410,6 +410,19 @@ elseif (SVN_CHECKSUM_BACKEND STREQUAL "b
"Defined if svn should use BCrypt to compute checksums."
"SVN_CHECKSUM_BACKEND_BCRYPT" "1"
)
+elseif (SVN_CHECKSUM_BACKEND STREQUAL "xdigest")
+ if (SVN_USE_PKG_CONFIG)
+ pkg_check_modules(xdigest REQUIRED IMPORTED_TARGET xdigest)
+ add_library(external-checksum-libs ALIAS PkgConfig::xdigest)
+ else()
+ find_package(XDIGEST REQUIRED)
+ add_library(external-checksum-libs ALIAS XDIGEST::XDIGEST)
+ endif()
+
+ add_private_config_definition(
+ "Defined if svn should use xdigest to compute checksums."
+ "SVN_CHECKSUM_BACKEND_XDIGEST" "1"
+ )
else()
message(SEND_ERROR
"Invalid value of SVN_CHECKSUM_BACKEND: '${SVN_CHECKSUM_BACKEND}'. "
Added: subversion/trunk/build/cmake/FindXDIGEST.cmake
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ subversion/trunk/build/cmake/FindXDIGEST.cmake Wed Feb 25 07:55:18
2026 (r1932040)
@@ -0,0 +1,47 @@
+find_path(XDIGEST_INCLUDE_DIR
+ NAMES "xdigest.h"
+ PATH_SUFFIXES
+ "include/xdigest"
+)
+
+find_library(XDIGEST_LIBRARY
+ NAMES "xdigest"
+ PATH_SUFFIXES "lib"
+)
+
+if(XDIGEST_INCLUDE_DIR AND EXISTS "${XDIGEST_INCLUDE_DIR}/xdigest.h")
+ file(
+ STRINGS "${XDIGEST_INCLUDE_DIR}/xdigest.h" VERSION_STRINGS
+ REGEX "#define
(XDIG_VERSION_MAJOR|XDIG_VERSION_MINOR|XDIG_VERSION_PATCH)"
+ )
+
+ string(REGEX REPLACE ".*XDIG_VERSION_MAJOR +([0-9]+).*" "\\1"
XDIG_VERSION_MAJOR ${VERSION_STRINGS})
+ string(REGEX REPLACE ".*XDIG_VERSION_MINOR +([0-9]+).*" "\\1"
XDIG_VERSION_MINOR ${VERSION_STRINGS})
+ string(REGEX REPLACE ".*XDIG_VERSION_PATCH +([0-9]+).*" "\\1"
XDIG_VERSION_PATCH ${VERSION_STRINGS})
+
+ set(XDIGEST_VERSION
"${XDIG_VERSION_MAJOR}.${XDIG_VERSION_MINOR}.${XDIG_VERSION_PATCH}")
+endif()
+
+mark_as_advanced(
+ XDIGEST_INCLUDE_DIR
+ XDIGEST_LIBRARY
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(
+ XDIGEST
+ REQUIRED_VARS
+ XDIGEST_LIBRARY
+ XDIGEST_INCLUDE_DIR
+ VERSION_VAR
+ XDIGEST_VERSION
+)
+
+if(XDIGEST_FOUND)
+ add_library(XDIGEST::XDIGEST IMPORTED STATIC)
+
+ set_target_properties(XDIGEST::XDIGEST PROPERTIES
+ IMPORTED_LOCATION ${XDIGEST_LIBRARY}
+ INTERFACE_INCLUDE_DIRECTORIES ${XDIGEST_INCLUDE_DIR}
+ )
+endif()
Added: subversion/trunk/subversion/libsvn_subr/checksum_xdigest.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ subversion/trunk/subversion/libsvn_subr/checksum_xdigest.c Wed Feb 25
07:55:18 2026 (r1932040)
@@ -0,0 +1,148 @@
+/*
+ * checksum_xdigest.c: xdigest backed checksums
+ *
+ * ====================================================================
+ * 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 "svn_private_config.h"
+#ifdef SVN_CHECKSUM_BACKEND_XDIGEST
+
+#include <apr_md5.h>
+#include <apr_sha1.h>
+#include <private/svn_atomic.h>
+
+#include "svn_error.h"
+#include "checksum.h"
+
+#include <xdigest.h>
+#include <xdigest_md5.h>
+#include <xdigest_sha1.h>
+
+static svn_atomic_t init_status = 0;
+
+/* This implements svn_atomic__void_init_func_t */
+static void
+xdigest_init_once(void *null_baton)
+{
+ xdig_init();
+}
+
+static void
+ensure_xdigest_init(void)
+{
+ svn_atomic__init_once_void(&init_status, xdigest_init_once, NULL);
+}
+
+/*** MD5 checksum ***/
+svn_error_t *
+svn_checksum__md5(unsigned char *digest,
+ const void *data,
+ apr_size_t len)
+{
+ ensure_xdigest_init();
+
+ xdig_md5(digest, data, len);
+ return SVN_NO_ERROR;
+}
+
+svn_checksum__md5_ctx_t *
+svn_checksum__md5_ctx_create(apr_pool_t *pool)
+{
+ ensure_xdigest_init();
+
+ xdig_md5_ctx_t *result = apr_palloc(pool, xdig_md5_ctx_size());
+ xdig_md5_ctx_init(result);
+ return (svn_checksum__md5_ctx_t *)result;
+}
+
+svn_error_t *
+svn_checksum__md5_ctx_reset(svn_checksum__md5_ctx_t *ctx)
+{
+ memset(ctx, 0, xdig_md5_ctx_size());
+ xdig_md5_ctx_init((xdig_md5_ctx_t *)ctx);
+ return SVN_NO_ERROR;
+}
+
+svn_error_t *
+svn_checksum__md5_ctx_update(svn_checksum__md5_ctx_t *ctx,
+ const void *data,
+ apr_size_t len)
+{
+ xdig_md5_ctx_update((xdig_md5_ctx_t *)ctx, data, len);
+ return SVN_NO_ERROR;
+}
+
+svn_error_t *
+svn_checksum__md5_ctx_final(unsigned char *digest,
+ svn_checksum__md5_ctx_t *ctx)
+{
+ xdig_md5_ctx_final((xdig_md5_ctx_t *)ctx, digest);
+ return SVN_NO_ERROR;
+}
+
+
+/*** SHA1 checksum ***/
+svn_error_t *
+svn_checksum__sha1(unsigned char *digest,
+ const void *data,
+ apr_size_t len)
+{
+ ensure_xdigest_init();
+
+ xdig_sha1(digest, data, len);
+ return SVN_NO_ERROR;
+}
+
+svn_checksum__sha1_ctx_t *
+svn_checksum__sha1_ctx_create(apr_pool_t *pool)
+{
+ ensure_xdigest_init();
+
+ xdig_sha1_ctx_t *result = apr_palloc(pool, xdig_sha1_ctx_size());
+ xdig_sha1_ctx_init(result);
+ return (svn_checksum__sha1_ctx_t *)result;
+}
+
+svn_error_t *
+svn_checksum__sha1_ctx_reset(svn_checksum__sha1_ctx_t *ctx)
+{
+ memset(ctx, 0, xdig_sha1_ctx_size());
+ xdig_sha1_ctx_init((xdig_sha1_ctx_t *)ctx);
+ return SVN_NO_ERROR;
+}
+
+svn_error_t *
+svn_checksum__sha1_ctx_update(svn_checksum__sha1_ctx_t *ctx,
+ const void *data,
+ apr_size_t len)
+{
+ xdig_sha1_ctx_update((xdig_sha1_ctx_t *)ctx , data, len);
+ return SVN_NO_ERROR;
+}
+
+svn_error_t *
+svn_checksum__sha1_ctx_final(unsigned char *digest,
+ svn_checksum__sha1_ctx_t *ctx)
+{
+ xdig_sha1_ctx_final((xdig_sha1_ctx_t *)ctx, digest);
+ return SVN_NO_ERROR;
+}
+
+#endif /* SVN_CHECKSUM_BACKEND_XDIGEST */
