lib/gcrypt/MD5: add wrapper in lib/crypto/

Prepare for using other crypto libraries, e.g. FFmpeg's libavutil.

src/lib/crypto/MD5.cxx

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2018-2019 Max Kellermann <max.kellermann@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "MD5.hxx"
+#include "lib/gcrypt/MD5.hxx"
+#include "lib/gcrypt/Init.hxx"
+#include "util/HexFormat.hxx"
+
+void
+GlobalInitMD5() noexcept
+{
+	Gcrypt::Init();
+}
+
+std::array<uint8_t, 16>
+MD5(ConstBuffer<void> input) noexcept
+{
+	return Gcrypt::MD5(input);
+}
+
+StringBuffer<33>
+MD5Hex(ConstBuffer<void> input) noexcept
+{
+	const auto raw = MD5(input);
+	return HexFormatBuffer<raw.size()>(&raw.front());
+}

src/lib/crypto/MD5.hxx

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2018-2019 Max Kellermann <max.kellermann@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef MD5_HXX
+#define MD5_HXX
+
+#include "util/StringBuffer.hxx"
+#include "util/Compiler.h"
+
+#include <array>
+
+template<typename T> struct ConstBuffer;
+
+void
+GlobalInitMD5() noexcept;
+
+gcc_pure
+std::array<uint8_t, 16>
+MD5(ConstBuffer<void> input) noexcept;
+
+gcc_pure
+StringBuffer<33>
+MD5Hex(ConstBuffer<void> input) noexcept;
+
+#endif

src/lib/crypto/meson.build

@@ -0,0 +1,18 @@
+if gcrypt_dep.found()
+  crypto_md5 = static_library(
+    'crypto_md5',
+    'MD5.cxx',
+    include_directories: inc,
+    dependencies: [
+      gcrypt_dep,
+    ],
+  )
+
+  crypto_md5_dep = declare_dependency(
+    link_with: crypto_md5,
+  )
+else
+  crypto_md5_dep = dependency('', required: false)
+endif
+
+conf.set('HAVE_MD5', crypto_md5_dep.found())