diff --git a/cmake/FindLibb2.cmake b/cmake/FindLibb2.cmake
new file mode 100644
index 00000000000..18b6e4df04c
--- /dev/null
+++ b/cmake/FindLibb2.cmake
@@ -0,0 +1,7 @@
+find_package(PkgConfig QUIET)
+
+pkg_check_modules(Libb2 libb2 IMPORTED_TARGET)
+
+if (NOT TARGET PkgConfig::Libb2)
+    set(Libb2_FOUND 0)
+endif()
diff --git a/src/corelib/.prev_CMakeLists.txt b/src/corelib/.prev_CMakeLists.txt
index 4ae1329db7a..e143581087b 100644
--- a/src/corelib/.prev_CMakeLists.txt
+++ b/src/corelib/.prev_CMakeLists.txt
@@ -642,6 +642,11 @@ qt_extend_target(Core CONDITION QT_FEATURE_doubleconversion AND NOT QT_FEATURE_s
         ../3rdparty/double-conversion/include
 )
 
+qt_extend_target(Core CONDITION QT_FEATURE_system_libb2
+    LIBRARIES
+        PkgConfig::Libb2
+)
+
 qt_extend_target(Core CONDITION QT_FEATURE_easingcurve
     SOURCES
         tools/qeasingcurve.cpp tools/qeasingcurve.h
@@ -1018,7 +1023,7 @@ qt_extend_target(Core CONDITION QT_FEATURE_mimetype
         mimetypes/qmimetypeparser.cpp mimetypes/qmimetypeparser_p.h
 )
 
-#### Keys ignored in scope 180:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_mimetype:
+#### Keys ignored in scope 181:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_mimetype:
 # MIME_DATABASE = "mimetypes/mime/packages/freedesktop.org.xml"
 # OTHER_FILES = "$$MIME_DATABASE"
 
@@ -1027,7 +1032,7 @@ qt_extend_target(Core CONDITION QT_FEATURE_mimetype AND QT_FEATURE_mimetype_data
         .rcc
 )
 
-#### Keys ignored in scope 181:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_mimetype_database:
+#### Keys ignored in scope 182:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_mimetype_database:
 # QMAKE_EXTRA_COMPILERS = "mimedb"
 # mimedb.commands = "${QMAKE_FILE_IN}" ">" "${QMAKE_FILE_OUT}"
 # mimedb.depends = "$$PWD/mime/generate.pl"
@@ -1035,23 +1040,23 @@ qt_extend_target(Core CONDITION QT_FEATURE_mimetype AND QT_FEATURE_mimetype_data
 # mimedb.output = "$$outpath/qmimeprovider_database.cpp"
 # mimedb.variable_out = "INCLUDED_SOURCES"
 
-#### Keys ignored in scope 182:.:mimetypes:mimetypes/mimetypes.pri:ANDROID:
+#### Keys ignored in scope 183:.:mimetypes:mimetypes/mimetypes.pri:ANDROID:
 # outpath = "$$outpath/$${QT_ARCH}"
 
-#### Keys ignored in scope 184:.:mimetypes:mimetypes/mimetypes.pri:(CMAKE_BUILD_TYPE STREQUAL Debug):
+#### Keys ignored in scope 185:.:mimetypes:mimetypes/mimetypes.pri:(CMAKE_BUILD_TYPE STREQUAL Debug):
 # outpath = "$$outpath/debug"
 
-#### Keys ignored in scope 185:.:mimetypes:mimetypes/mimetypes.pri:else:
+#### Keys ignored in scope 186:.:mimetypes:mimetypes/mimetypes.pri:else:
 # outpath = "$$outpath/release"
 
-#### Keys ignored in scope 186:.:mimetypes:mimetypes/mimetypes.pri:MAKEFILE_GENERATOR___equals___MSVC.NET OR MAKEFILE_GENERATOR___equals___MSBUILD OR QMAKE_SH_ISEMPTY:
+#### Keys ignored in scope 187:.:mimetypes:mimetypes/mimetypes.pri:MAKEFILE_GENERATOR___equals___MSVC.NET OR MAKEFILE_GENERATOR___equals___MSBUILD OR QMAKE_SH_ISEMPTY:
 # mimedb.commands = "cmd" "/c" "$$shell_path($$PWD/mime/generate.bat)"
 # mimedb.depends = "$$PWD/mime/generate.bat" "$$PWD/mime/hexdump.ps1"
 
-#### Keys ignored in scope 187:.:mimetypes:mimetypes/mimetypes.pri:else:
+#### Keys ignored in scope 188:.:mimetypes:mimetypes/mimetypes.pri:else:
 # mimedb.commands = "perl" "$${mimedb.depends}"
 
-#### Keys ignored in scope 188:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_zstd:
+#### Keys ignored in scope 189:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_zstd:
 # mimedb.commands = "--zstd"
 
 qt_extend_target(Core CONDITION WASM
diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index 5d79b00bf99..4a3204e3816 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -247,13 +247,13 @@ qt_add_module(Core
         # ../3rdparty/md5 # special case remove
         # ../3rdparty/sha3 # special case remove
         ../3rdparty/tinycbor/src
+    LIBRARIES
+        Qt::GlobalConfigPrivate # special case
+        Threads::Threads # special case
     PRECOMPILED_HEADER
         "global/qt_pch.h"
     NO_PCH_SOURCES
         "text/qstring_compat.cpp"
-    LIBRARIES
-        Qt::GlobalConfigPrivate # special case
-        Threads::Threads # special case
     PUBLIC_LIBRARIES  # special case:
         Qt::Platform # special case:
     # special case begin
@@ -747,6 +747,11 @@ qt_extend_target(Core CONDITION QT_FEATURE_doubleconversion AND NOT QT_FEATURE_s
         ../3rdparty/double-conversion/include
 )
 
+qt_extend_target(Core CONDITION QT_FEATURE_system_libb2
+    LIBRARIES
+        PkgConfig::Libb2
+)
+
 qt_extend_target(Core CONDITION QT_FEATURE_easingcurve
     SOURCES
         tools/qeasingcurve.cpp tools/qeasingcurve.h
@@ -1123,7 +1128,7 @@ qt_extend_target(Core CONDITION QT_FEATURE_mimetype
         mimetypes/qmimetypeparser.cpp mimetypes/qmimetypeparser_p.h
 )
 
-#### Keys ignored in scope 180:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_mimetype:
+#### Keys ignored in scope 181:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_mimetype:
 # MIME_DATABASE = "mimetypes/mime/packages/freedesktop.org.xml"
 # OTHER_FILES = "$$MIME_DATABASE"
 
@@ -1134,7 +1139,7 @@ qt_extend_target(Core CONDITION QT_FEATURE_mimetype
 #)
 # special case end
 
-#### Keys ignored in scope 181:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_mimetype_database:
+#### Keys ignored in scope 182:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_mimetype_database:
 # QMAKE_EXTRA_COMPILERS = "mimedb"
 # mimedb.commands = "${QMAKE_FILE_IN}" ">" "${QMAKE_FILE_OUT}"
 # mimedb.depends = "$$PWD/mime/generate.pl"
@@ -1142,23 +1147,23 @@ qt_extend_target(Core CONDITION QT_FEATURE_mimetype
 # mimedb.output = "$$outpath/qmimeprovider_database.cpp"
 # mimedb.variable_out = "INCLUDED_SOURCES"
 
-#### Keys ignored in scope 182:.:mimetypes:mimetypes/mimetypes.pri:ANDROID:
+#### Keys ignored in scope 183:.:mimetypes:mimetypes/mimetypes.pri:ANDROID:
 # outpath = "$$outpath/$${QT_ARCH}"
 
-#### Keys ignored in scope 184:.:mimetypes:mimetypes/mimetypes.pri:(CMAKE_BUILD_TYPE STREQUAL Debug):
+#### Keys ignored in scope 185:.:mimetypes:mimetypes/mimetypes.pri:(CMAKE_BUILD_TYPE STREQUAL Debug):
 # outpath = "$$outpath/debug"
 
-#### Keys ignored in scope 185:.:mimetypes:mimetypes/mimetypes.pri:else:
+#### Keys ignored in scope 186:.:mimetypes:mimetypes/mimetypes.pri:else:
 # outpath = "$$outpath/release"
 
-#### Keys ignored in scope 186:.:mimetypes:mimetypes/mimetypes.pri:MAKEFILE_GENERATOR___equals___MSVC.NET OR MAKEFILE_GENERATOR___equals___MSBUILD OR QMAKE_SH_ISEMPTY:
+#### Keys ignored in scope 187:.:mimetypes:mimetypes/mimetypes.pri:MAKEFILE_GENERATOR___equals___MSVC.NET OR MAKEFILE_GENERATOR___equals___MSBUILD OR QMAKE_SH_ISEMPTY:
 # mimedb.commands = "cmd" "/c" "$$shell_path($$PWD/mime/generate.bat)"
 # mimedb.depends = "$$PWD/mime/generate.bat" "$$PWD/mime/hexdump.ps1"
 
-#### Keys ignored in scope 187:.:mimetypes:mimetypes/mimetypes.pri:else:
+#### Keys ignored in scope 188:.:mimetypes:mimetypes/mimetypes.pri:else:
 # mimedb.commands = "perl" "$${mimedb.depends}"
 
-#### Keys ignored in scope 188:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_zstd:
+#### Keys ignored in scope 189:.:mimetypes:mimetypes/mimetypes.pri:QT_FEATURE_zstd:
 # mimedb.commands = "--zstd"
 # Resources:
 # special case begin
diff --git a/src/corelib/configure.cmake b/src/corelib/configure.cmake
index 7f565437cd8..21a525bd039 100644
--- a/src/corelib/configure.cmake
+++ b/src/corelib/configure.cmake
@@ -6,6 +6,10 @@
 set(INPUT_doubleconversion "undefined" CACHE STRING "")
 set_property(CACHE INPUT_doubleconversion PROPERTY STRINGS undefined no qt system)
 
+# input libb2
+set(INPUT_libb2 "undefined" CACHE STRING "")
+set_property(CACHE INPUT_libb2 PROPERTY STRINGS undefined no qt system)
+
 
 
 #### Libraries
@@ -18,6 +22,7 @@ if(QT_FEATURE_dlopen)
 endif()
 qt_find_package(Libsystemd PROVIDED_TARGETS PkgConfig::Libsystemd MODULE_NAME core QMAKE_LIB journald)
 qt_find_package(WrapAtomic PROVIDED_TARGETS WrapAtomic::WrapAtomic MODULE_NAME core QMAKE_LIB libatomic)
+qt_find_package(Libb2 PROVIDED_TARGETS PkgConfig::Libb2 MODULE_NAME core QMAKE_LIB libb2)
 qt_find_package(WrapRt PROVIDED_TARGETS WrapRt::WrapRt MODULE_NAME core QMAKE_LIB librt)
 qt_find_package(LTTngUST PROVIDED_TARGETS LTTng::UST MODULE_NAME core QMAKE_LIB lttng-ust)
 qt_add_qmake_lib_dependency(lttng-ust libdl)
@@ -607,6 +612,13 @@ qt_feature("journald" PRIVATE
     AUTODETECT OFF
     CONDITION Libsystemd_FOUND
 )
+# Used by QCryptographicHash for the BLAKE2 hashing algorithms
+qt_feature("system-libb2" PRIVATE
+    LABEL "Using system libb2"
+    CONDITION Libb2_FOUND
+    ENABLE INPUT_libb2 STREQUAL 'system'
+    DISABLE INPUT_libb2 STREQUAL 'no' OR INPUT_libb2 STREQUAL 'qt'
+)
 # Currently only used by QTemporaryFile; linkat() exists on Android, but hardlink creation fails due to security rules
 qt_feature("linkat" PRIVATE
     LABEL "linkat()"
@@ -956,6 +968,7 @@ qt_configure_add_summary_entry(ARGS "doubleconversion")
 qt_configure_add_summary_entry(ARGS "system-doubleconversion")
 qt_configure_add_summary_entry(ARGS "glib")
 qt_configure_add_summary_entry(ARGS "icu")
+qt_configure_add_summary_entry(ARGS "system-libb2")
 qt_configure_add_summary_entry(ARGS "mimetype-database")
 qt_configure_add_summary_entry(
     TYPE "firstAvailableFeature"
diff --git a/src/corelib/configure.json b/src/corelib/configure.json
index 2610392ad12..966bc7684a0 100644
--- a/src/corelib/configure.json
+++ b/src/corelib/configure.json
@@ -10,6 +10,7 @@
             "icu": "boolean",
             "inotify": "boolean",
             "journald": "boolean",
+            "libb2": { "type": "enum", "values": [ "no", "qt", "system" ] },
             "mimetype-database": "boolean",
             "pcre": { "type": "enum", "values": [ "no", "qt", "system" ] },
             "posix-ipc": { "type": "boolean", "name": "ipc_posix" },
@@ -111,6 +112,16 @@
                 "-latomic"
             ]
         },
+        "libb2": {
+            "label": "libb2",
+            "test": {
+                "main": "BLAKE2B_BLOCKBYTES;"
+            },
+            "headers": "blake2.h",
+            "sources": [
+                { "type": "pkgConfig", "args": "libb2" }
+            ]
+        },
         "librt": {
             "label": "clock_gettime()",
             "test": {
@@ -647,6 +658,14 @@
             "condition": "libs.journald",
             "output": [ "privateFeature" ]
         },
+        "system-libb2": {
+            "label": "Using system libb2",
+            "comment": "Used by QCryptographicHash for the BLAKE2 hashing algorithms",
+            "disable": "input.libb2 == 'no' || input.libb2 == 'qt'",
+            "enable": "input.libb2 == 'system'",
+            "condition": "libs.libb2",
+            "output": [ "privateFeature" ]
+        },
         "linkat": {
             "label": "linkat()",
             "comment": "Currently only used by QTemporaryFile; linkat() exists on Android, but hardlink creation fails due to security rules",
@@ -1074,6 +1093,7 @@ Note that this is required for plugin loading. Qt GUI needs QPA plugins for basi
                 "system-doubleconversion",
                 "glib",
                 "icu",
+                "system-libb2",
                 "mimetype-database",
                 {
                     "message": "Tracing backend",
diff --git a/src/corelib/tools/qcryptographichash.cpp b/src/corelib/tools/qcryptographichash.cpp
index 9f98475dc0e..d5a6c4e5a0a 100644
--- a/src/corelib/tools/qcryptographichash.cpp
+++ b/src/corelib/tools/qcryptographichash.cpp
@@ -165,8 +165,12 @@ static inline int SHA384_512AddLength(SHA512Context *context, unsigned int lengt
   return SHA384_512AddLengthM(context, length);
 }
 
+#if QT_CONFIG(system_libb2)
+#include <blake2.h>
+#else
 #include "../../3rdparty/blake2/src/blake2b-ref.c"
 #include "../../3rdparty/blake2/src/blake2s-ref.c"
+#endif
 #endif // QT_CRYPTOGRAPHICHASH_ONLY_SHA1
 
 QT_BEGIN_NAMESPACE
diff --git a/src/corelib/tools/qmessageauthenticationcode.cpp b/src/corelib/tools/qmessageauthenticationcode.cpp
index d84b1b0b6cb..ada502ecb83 100644
--- a/src/corelib/tools/qmessageauthenticationcode.cpp
+++ b/src/corelib/tools/qmessageauthenticationcode.cpp
@@ -40,6 +40,8 @@
 #include "qmessageauthenticationcode.h"
 #include "qvarlengtharray.h"
 
+#include "qtcore-config_p.h"
+
 /*
     These #defines replace the typedefs needed by the RFC6234 code. Normally
     the typedefs would come from from stdint.h, but since this header is not
@@ -75,7 +77,11 @@
 // sha1.h - commented out '#include <stdint.h>' on line 74
 #include "../../3rdparty/rfc6234/sha.h"
 
+#if QT_CONFIG(system_libb2)
+#include <blake2.h>
+#else
 #include "../../3rdparty/blake2/src/blake2.h"
+#endif
 
 #undef uint64_t
 #undef uint32_t
diff --git a/src/corelib/tools/tools.pri b/src/corelib/tools/tools.pri
index 4d3b5e25ff7..c8ce79ce36b 100644
--- a/src/corelib/tools/tools.pri
+++ b/src/corelib/tools/tools.pri
@@ -99,6 +99,10 @@ qtConfig(system-doubleconversion) {
     include($$PWD/../../3rdparty/double-conversion/double-conversion.pri)
 }
 
+qtConfig(system-libb2) {
+    QMAKE_USE_PRIVATE += libb2
+}
+
 qtConfig(easingcurve) {
     HEADERS += \
         tools/qeasingcurve.h \
diff --git a/util/cmake/helper.py b/util/cmake/helper.py
index 02a241b0181..c2aa49168c0 100644
--- a/util/cmake/helper.py
+++ b/util/cmake/helper.py
@@ -412,6 +412,7 @@ _library_map = [
     LibraryMapping("journald", "Libsystemd", "PkgConfig::Libsystemd"),
     LibraryMapping("jpeg", "JPEG", "JPEG::JPEG"),  # see also libjpeg
     LibraryMapping("libatomic", "WrapAtomic", "WrapAtomic::WrapAtomic"),
+    LibraryMapping("libb2", "Libb2", "PkgConfig::Libb2"),
     LibraryMapping("libclang", "WrapLibClang", "WrapLibClang::WrapLibClang"),
     LibraryMapping("libdl", None, "${CMAKE_DL_LIBS}"),
     LibraryMapping("libinput", "Libinput", "Libinput::Libinput"),
diff --git a/util/cmake/pro2cmake.py b/util/cmake/pro2cmake.py
index defadee3f33..a01795a8337 100755
--- a/util/cmake/pro2cmake.py
+++ b/util/cmake/pro2cmake.py
@@ -1645,6 +1645,7 @@ def map_condition(condition: str) -> str:
                     and not feature_name.startswith("system_doubleconversion")
                     and not feature_name.startswith("system_sqlite")
                     and not feature_name.startswith("system_hunspell")
+                    and not feature_name.startswith("system_libb2")
                 ):
                     part = "ON"
                 elif feature == "dlopen":