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lib/PrettyOTA/src/MD5Hasher.h

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+/*
+
+Copyright (c) 2025 Marc Schöndorf
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Branding or white-labeling (changing the logo and name of PrettyOTA) is permitted only
+with a commercial license. See README for details.
+
+Permission is granted to anyone to use this software for private and commercial
+applications, to alter it and redistribute it, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented. You must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment is required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. You are not allowed to change the logo or name of PrettyOTA without a commercial
+   license, even when redistributing modified source code.
+4. This notice may not be removed or altered from any source distribution.
+
+
+******************************************************
+*                    PRETTY OTA                      *
+*                                                    *
+* A better looking Web-OTA.                          *
+******************************************************
+
+Description:
+    Helper class for building MD5 hashes.
+
+*/
+
+#pragma once
+
+#include <string>   // For std::string
+#include <string.h> // For memcpy, memset
+
+#include <esp_system.h>
+#include <esp_rom_md5.h>
+
+namespace NSPrettyOTA
+{
+    class MD5Hasher
+    {
+    private:
+        md5_context_t m_Context;
+        uint8_t       m_Buffer[ESP_ROM_MD5_DIGEST_LEN] = {0};
+
+    public:
+        static const uint8_t MD5_HASH_STR_SIZE = (2 * ESP_ROM_MD5_DIGEST_LEN + 1);
+
+        MD5Hasher() = default;
+
+        void Begin();
+        void AddData(const uint8_t* data, uint32_t size);
+        void AddData(const char* data, uint32_t size);
+        void Calculate();
+
+        void GetHashAsBytes(uint8_t out[ESP_ROM_MD5_DIGEST_LEN]) const;
+        std::string GetHashAsString() const;
+    };
+}