Jonas Arnold
3 years ago
parent
a1e00b5716
commit
5c24e160bc
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<ClCompile Include="XTEA-CBC.c" /> |
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<ClCompile Include="XTEA.c" /> |
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@ -0,0 +1,37 @@ |
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/**
|
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*--------------------------------------------------------------------\n |
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* HSLU T&A Hochschule Luzern Technik+Architektur \n |
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*--------------------------------------------------------------------\n |
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* |
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* \brief model solution for ASYD assignment crypto 01 |
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* \file |
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* \author SIMON FREI, stefano.nicora@hslu.ch |
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* \date 04.10.22 |
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* |
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*-------------------------------------------------------------------- |
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*/ |
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|
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#include <stdint.h> |
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#include "XTEA-CBC.h" |
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#include "XTEA.h" |
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|
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#define INITIALIZATION_VECTOR { 'COFE', 'SIMI' } |
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|
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void encipher_CBC(unsigned int num_cycles, uint32_t v[2], uint32_t const k[4]) { |
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static uint32_t v_prev[2] = INITIALIZATION_VECTOR; |
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v[0] = v[0] ^ v_prev[0]; |
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v[1] = v[1] ^ v_prev[1]; |
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encipher(num_cycles, v, k); |
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v_prev[0] = v[0]; |
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v_prev[1] = v[1]; |
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} |
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|
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void decipher_CBC(unsigned int num_cycles, uint32_t v[2], uint32_t const k[4]) { |
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static uint32_t v_prev[2] = INITIALIZATION_VECTOR; |
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uint32_t v_input[2] = { v[0], v[1] }; |
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decipher(num_cycles, v, k); |
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v[0] = v[0] ^ v_prev[0]; |
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v[1] = v[1] ^ v_prev[1]; |
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v_prev[0] = v_input[0]; |
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v_prev[1] = v_input[1]; |
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} |
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@ -0,0 +1,25 @@ |
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/**
|
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*--------------------------------------------------------------------\n |
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* HSLU T&A Hochschule Luzern Technik+Architektur \n |
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*--------------------------------------------------------------------\n |
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* |
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* \brief model solution for ASYD assignment crypto 01 |
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* \file |
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* \author Stefano Nicora, stefano.nicora@hslu.ch |
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* \date 04.10.22 |
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* |
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*-------------------------------------------------------------------- |
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*/ |
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|
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#ifndef XTEA_CBC_H_ |
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#define XTEA_CBC_H_ |
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#define _CRT_SECURE_NO_WARININGS |
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#pragma warning(disable:4996) |
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|
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#include <stdint.h> |
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|
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void encipher_CBC(unsigned int num_cycles, uint32_t v[2], uint32_t const k[4]); |
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|
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void decipher_CBC(unsigned int num_cycles, uint32_t v[2], uint32_t const k[4]); |
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|
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#endif // !XTEA_CBC_H_
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@ -0,0 +1,39 @@ |
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/**
|
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*--------------------------------------------------------------------\n |
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* HSLU T&A Hochschule Luzern Technik+Architektur \n |
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*--------------------------------------------------------------------\n |
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* |
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* \brief model solution for ASYD assignment crypto 01 |
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* \file |
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* \author Stefano Nicora, stefano.nicora@hslu.ch |
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* \date 04.10.22 |
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* |
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*-------------------------------------------------------------------- |
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*/ |
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|
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#include <stdint.h> |
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#include "XTEA.h" |
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|
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void encipher(unsigned int num_cycles, uint32_t v[2], uint32_t const k[4]) { |
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unsigned int i; |
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const uint32_t delta = 0x9E3779B9; |
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uint32_t v0 = v[0], v1 = v[1], sum = 0; |
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for (i = 0; i < num_cycles; i++) { |
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v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]); |
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sum += delta; |
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v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]); |
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} |
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v[0] = v0; v[1] = v1; |
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} |
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|
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void decipher(unsigned int num_cycles, uint32_t v[2], uint32_t const k[4]) { |
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unsigned int i; |
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const uint32_t delta = 0x9E3779B9; |
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uint32_t v0 = v[0], v1 = v[1], sum = delta * num_cycles; |
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for (i = 0; i < num_cycles; i++) { |
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v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]); |
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sum -= delta; |
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v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]); |
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} |
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v[0] = v0; v[1] = v1; |
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} |
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@ -0,0 +1,26 @@ |
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/**
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*--------------------------------------------------------------------\n |
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* HSLU T&A Hochschule Luzern Technik+Architektur \n |
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*--------------------------------------------------------------------\n |
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* |
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* \brief model solution for ASYD assignment crypto 01 |
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* \file |
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* \author Stefano Nicora, stefano.nicora@hslu.ch |
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* \date 04.10.22 |
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* |
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*-------------------------------------------------------------------- |
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*/ |
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|
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#ifndef XTEA_H_ |
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#define XTEA_H_ |
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#define _CRT_SECURE_NO_WARININGS |
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#pragma warning(disable:4996) |
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#include <stdint.h> |
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|
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void encipher(unsigned int num_cycles, uint32_t v[2], uint32_t const k[4]); |
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|
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void decipher(unsigned int num_cycles, uint32_t v[2], uint32_t const k[4]); |
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|
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#endif // !XTEA_H_
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|
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@ -0,0 +1,163 @@ |
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/**
|
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*--------------------------------------------------------------------\n |
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* HSLU T&A Hochschule Luzern Technik+Architektur \n |
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*--------------------------------------------------------------------\n |
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* |
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* \brief model solution for ASYD assignment crypto 01 |
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* \file |
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* \author Stefano Nicora, stefano.nicora@hslu.ch |
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* \date 12.10.22 |
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* |
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*-------------------------------------------------------------------- |
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*/ |
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#include <stdint.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include "XTEA-CBC.h" |
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|
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void encrypt(uint32_t key[4], uint8_t numberOfCycles); |
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void decrypt(uint32_t key[4], uint8_t numberOfCycles); |
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/* source: https://en.wikipedia.org/wiki/XTEA */ |
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/* filenames as of this code:
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* plaintext.txt => holds the message you want to encrypt |
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* encrypted.cip => holds the encrypted message |
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* decrypted.txt => holds the decrypted output from "encrypted.cip" |
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*/ |
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void main(void) { |
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uint32_t key[4] = { 1, 3, 1, 2}; |
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encrypt(key, 32); |
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decrypt(key, 32); |
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} |
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|
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void encrypt(uint32_t key[4], uint8_t numberOfCycles) { |
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/* duplicate code that hasn't been moved to a separate function for readability reasons */ |
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/* -------------------------------------------------------------------- */ |
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/* variables */ |
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uint32_t amountOfCharsInFile = 0; |
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/* https://www.programiz.com/c-programming/c-file-input-output */ |
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FILE* fileHandle = fopen("plaintext.txt", "r"); |
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if (fileHandle == NULL) { |
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return; |
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} |
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|
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/* get total number of characters in file to encrypt */ |
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while (getc(fileHandle) != EOF) { |
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amountOfCharsInFile++; |
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} |
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|
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/* allocate enough memory for the whole file to be read */ |
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char* inputText = (char*)calloc(amountOfCharsInFile + 8, sizeof(char)); /* add 8 for extra padding in case the file contains some sort of rest in regards to amountOfCharsInFile % 8 */ |
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if (inputText == NULL) { |
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return; |
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} |
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|
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/* close and reopen file to start at the beginning of the file again */ |
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fclose(fileHandle); |
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fileHandle = fopen("plaintext.txt", "r"); |
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if (fileHandle == NULL) { |
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return; |
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} |
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|
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/* read the whole file into memory */ |
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for (uint32_t i = 0; i < amountOfCharsInFile; i++) { |
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inputText[i] = getc(fileHandle); |
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} |
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fclose(fileHandle); |
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/* -------------------------------------------------------------------- */ |
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|
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/* loop through the whole array to encrypt the whole message
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This happens two blocks of 32bit (= 8 characters) at a time |
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Hence the increase of "i" by 8 |
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*/ |
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for (uint32_t i = 0; i < amountOfCharsInFile; i += 8) { /* + 8 to compensate for the requested element size of the encipher function (32 bit) */ |
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/* dereferencing and forwarding the address of the key ensures,
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* that we don't ready from a random address in memory. Rookie mistakes happen :) */ |
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encipher_CBC(numberOfCycles, &(inputText[i]), &(*key)); |
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} |
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|
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/* generate new file where encryption is stored */ |
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fileHandle = fopen("encrypted.cip", "w"); |
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if (fileHandle == NULL) { |
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return; |
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} |
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/* fill new file with content */ |
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/* to get the extra character padding we might unintentionally drop
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* we need to read up to a multiple of 8 (32 bit) |
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*/ |
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for (uint32_t i = 0; i < (amountOfCharsInFile + (8-(amountOfCharsInFile%8))); i++) { |
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putc(inputText[i], fileHandle); |
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} |
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fclose(fileHandle); |
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free(inputText); |
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} |
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|
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void decrypt(uint32_t key[4], uint8_t numberOfCycles) { |
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|
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/* duplicate code that hasn't been moved to a separate function for readability reasons */ |
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/* -------------------------------------------------------------------- */ |
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|
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/* variables */ |
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uint32_t amountOfCharsInFile = 0; |
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/* https://www.programiz.com/c-programming/c-file-input-output */ |
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FILE* fileHandle = fopen("encrypted.cip", "r"); |
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if (fileHandle == NULL) { |
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return; |
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} |
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|
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/* get total number of characters in file to decrypt */ |
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while (getc(fileHandle) != EOF) { |
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amountOfCharsInFile++; |
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} |
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|
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/* allocate memory for the whole file to be read */ |
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char* inputText = (char*)calloc(amountOfCharsInFile + 10, sizeof(char)); /* add 10 for extra padding */ |
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if (inputText == NULL) { |
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return; |
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} |
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|
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/* close and reopen file to start at the beginning of the file again */ |
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fclose(fileHandle); |
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fileHandle = fopen("encrypted.cip", "r"); |
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if (fileHandle == NULL) { |
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return; |
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} |
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|
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/* read the whole file into memory */ |
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for (uint32_t i = 0; i < amountOfCharsInFile; i++) { |
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inputText[i] = getc(fileHandle); |
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} |
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fclose(fileHandle); |
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|
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/* -------------------------------------------------------------------- */ |
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|
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/* loop through the whole array to encrypt the whole message
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This happens two blocks of 32bit (= 4 characters) at a time |
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Hence the increase of "i" by 8 |
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*/ |
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|
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for (uint32_t i = 0; i < amountOfCharsInFile; i += 8) { /* i += 8*/ |
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/* dereferencing and forwarding the address of the key ensures,
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* that we don't ready from a random address in memory. Rookie mistakes happen :) */ |
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decipher_CBC(numberOfCycles, &(inputText[i]), &(*key)); |
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} |
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|
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/* generate new file where the decryption is stored */ |
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fileHandle = fopen("decrypted.txt", "w"); |
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if (fileHandle == NULL) { |
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return; |
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} |
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/* fill new file with content */ |
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for (uint32_t i = 0; i < amountOfCharsInFile; i++) { |
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putc(inputText[i], fileHandle); |
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} |
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fclose(fileHandle); |
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free(inputText); |
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} |
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