develop/ktcc: Post-SVN tidy

- Move source code from `trunk` into program root directory.
- Update build files and include paths.
- These changes also update the CI build files in `.gitea/workflows/`.
- Note: Line endings standardised from `CRLF` > `LF`, so best to view diffs with whitespace changes hidden.

programs/develop/ktcc/libc.obj/include/cryptal/des.h

@@ -0,0 +1,37 @@
+/*********************************************************************
+* Filename:   des.h
+* Author:     Brad Conte (brad AT bradconte.com)
+* Copyright:
+* Disclaimer: This code is presented "as is" without any guarantees.
+* Details:    Defines the API for the corresponding DES implementation.
+              Note that encryption and decryption are defined by how
+              the key setup is performed, the actual en/de-cryption is
+              performed by the same function.
+*********************************************************************/
+
+#ifndef DES_H
+#define DESH
+
+/*************************** HEADER FILES ***************************/
+#include <stddef.h>
+
+/****************************** MACROS ******************************/
+#define DES_BLOCK_SIZE 8                // DES operates on 8 bytes at a time
+
+/**************************** DATA TYPES ****************************/
+typedef unsigned char BYTE;             // 8-bit byte
+typedef unsigned int  WORD;             // 32-bit word, change to "long" for 16-bit machines
+
+typedef enum {
+	DES_ENCRYPT,
+	DES_DECRYPT
+} DES_MODE;
+
+/*********************** FUNCTION DECLARATIONS **********************/
+void des_key_setup(const BYTE key[], BYTE schedule[][6], DES_MODE mode);
+void des_crypt(const BYTE in[], BYTE out[], const BYTE key[][6]);
+
+void three_des_key_setup(const BYTE key[], BYTE schedule[][16][6], DES_MODE mode);
+void three_des_crypt(const BYTE in[], BYTE out[], const BYTE key[][16][6]);
+
+#endif   // DES_H