initial commit

libTinyEncrypt/libEncrypt_SHA256.h

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+#pragma once
+
+#include <stdint.h>
+
+#include <array>
+#include <string>
+
+typedef struct {
+    uint64_t length;
+    uint32_t state[8];
+    uint32_t curlen;
+    uint8_t buf[64];
+} Sha256Context;
+
+typedef std::array<uint8_t, 32> Sha256Digest;
+
+//  Initialises a SHA256 Context. Use this to initialise/reset a context.
+void sha256Initialise(Sha256Context* Context);
+
+//  Adds data to the SHA256 context. This will process the data and update the
+//  internal state of the context. Keep on calling this function until all the
+//  data has been added. Then call Sha256Finalise to calculate the hash.
+void sha256Update(Sha256Context* Context, void const* Buffer, uint32_t BufferSize);
+
+//  Performs the final calculation of the hash and returns the digest (32 byte
+//  buffer containing 256bit hash). After calling this, Sha256Initialised must
+//  be used to reuse the context.
+void sha256Finalise(Sha256Context* Context, Sha256Digest& Digest);
+
+//  Combines Sha256Initialise, Sha256Update, and Sha256Finalise into one
+//  function. Calculates the SHA256 hash of the buffer.
+void sha256Calculate(void const* Buffer, uint32_t BufferSize, Sha256Digest& Digest);
+
+//  Converts a SHA256_HASH to a human-readable string.
+std::string sha256ToString(const Sha256Digest& Digest);