sha256 add class and cpp functions

Author: pennam

src/sha256/SHA256.cpp

@@ -0,0 +1,23 @@
+/*
+    This file is part of the Arduino_CloudUtils library.
+
+    Copyright (c) 2024 Arduino SA
+
+    This Source Code Form is subject to the terms of the Mozilla Public
+    License, v. 2.0. If a copy of the MPL was not distributed with this
+    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+#include "SHA256.h"
+
+void SHA256::begin() {
+    sha256_init(&_ctx);
+}
+
+void SHA256::update(uint8_t const * data, uint32_t const len) {
+    sha256_update(&_ctx, data, len);
+}
+
+void SHA256::finalize(uint8_t * hash) {
+    sha256_final(&_ctx, hash);
+}

src/sha256/SHA256.h

@@ -0,0 +1,45 @@
+/*
+    This file is part of the Arduino_CloudUtils library.
+
+    Copyright (c) 2024 Arduino SA
+
+    This Source Code Form is subject to the terms of the Mozilla Public
+    License, v. 2.0. If a copy of the MPL was not distributed with this
+    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include "sha256.h"
+
+class SHA256 {
+
+public:
+
+    static constexpr uint32_t HASH_SIZE = SHA256_DIGEST_SIZE;
+
+    void begin();
+    void update(uint8_t const * data, uint32_t const len);
+    void finalize(uint8_t * hash);
+
+private:
+
+    sha256_ctx _ctx;
+};
+
+namespace arduino { namespace sha256 {
+
+    inline void begin(sha256_ctx * ctx) {
+        return sha256_init(ctx);
+    }
+    inline void update(sha256_ctx *ctx, const uint8_t *input, uint32_t length) {
+        return sha256_update(ctx, input, length);
+    }
+    inline void finalize(sha256_ctx * ctx, uint8_t digest[SHA256_DIGEST_SIZE]) {
+        return sha256_final(ctx, digest);
+    }
+    inline void oneshot(const unsigned char *input, unsigned int ilen, unsigned char *output) {
+        ::sha256(input, ilen, output);
+    }
+
+}} // arduino::sha256