Create README.md

README.md

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+# AES-CBC-MetaTrader
+AES 256 bit algorithm in CBC mode for MetaTrader
+
+This is an implementation of the AES algorithm, specifically CBC mode.
+
+Based on the code https://github.com/kokke/tiny-AES-c. There you can see the code's comments that have been removed here.
+
+## Usage
+```C
+   // Initialize context calling one of:
+   void AES_init_ctx(AES_ctx& ctx, const uchar &key[]);
+   void AES_init_ctx_iv(AES_ctx &ctx, const uchar &key[], const uchar &iv[]);
+
+   // Set IV
+   void AES_ctx_set_iv(AES_ctx &ctx, const uchar &iv[]);
+
+   // Then start encrypting and decrypting with the functions below:
+   void AES_CBC_encrypt_buffer(AES_ctx &ctx, uchar &buf[], uchar &out[]);
+   void AES_CBC_decrypt_buffer(AES_ctx &ctx, uchar &buf[], uchar &out[]);
+
+   // Padding the buffer
+   void fillPadding_PKCS7(uchar &buf[]);
+
+   // Checks if padding is filled in correctly
+   bool checkPadding_PKCS7(const uchar &buf[]);
+
+   // Removes padding
+   void unFillPadding_PKCS7(uchar &buf[]);
+```