testing

Advanced-Encryption-Standard/README.md

@@ -0,0 +1,14 @@
+# AES Encryption Algorithm
+
+## Description
+This project implements a basic version of the AES-128 encryption algorithm, with simplified transformations for SubBytes, ShiftRows, MixColumns, and AddRoundKey.
+
+## How to Build
+1. Navigate to the `build` directory.
+2. Run `make` to compile the project.
+
+## How to Run
+1. After building, run the `aes` executable using `./aes`.
+
+## How to Clean
+- Run `make clean` to remove all compiled files.

Advanced-Encryption-Standard/build/Makefile

@@ -0,0 +1,28 @@
+# Variables
+CC = gcc
+CFLAGS = -I../include -Wall -Wextra
+OBJDIR = ../obj
+SRCDIR = ../src
+BINDIR = ../build
+
+# Source files
+SOURCES = $(SRCDIR)/main.c $(SRCDIR)/aes.c
+OBJECTS = $(OBJDIR)/main.o $(OBJDIR)/aes.o
+
+# Build target
+TARGET = aes
+
+# Rules
+all: $(BINDIR)/$(TARGET)
+
+$(BINDIR)/$(TARGET): $(OBJECTS)
+	$(CC) $(OBJECTS) -o $(BINDIR)/$(TARGET)
+
+$(OBJDIR)/%.o: $(SRCDIR)/%.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+clean:
+	rm -f $(OBJDIR)/*.o $(BINDIR)/$(TARGET)
+
+.PHONY: all clean
+

Advanced-Encryption-Standard/include/aes.h

@@ -0,0 +1,9 @@
+#ifndef AES_H
+#define AES_H
+
+#include <stdint.h> 
+
+void aes_encrypt(uint8_t *message, uint8_t *key);
+void aes_decrypt(uint8_t *message, uint8_t *key);
+
+#endif // AES_H

Advanced-Encryption-Standard/src/aes.c

@@ -0,0 +1,210 @@
+#include "aes.h"
+#include <stdint.h>
+#include <string.h>
+
+// Real AES S-box
+static const uint8_t sbox[256] = {
+    0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
+    0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
+    0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
+    0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
+    0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
+    0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
+    0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
+    0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
+    0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
+    0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
+    0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
+    0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
+    0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
+    0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
+    0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
+    0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
+};
+
+// Real AES inverse S-box
+static const uint8_t inv_sbox[256] = {
+    0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
+    0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
+    0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
+    0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
+    0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
+    0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
+    0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
+    0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
+    0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
+    0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
+    0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
+    0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
+    0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
+    0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
+    0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
+    0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
+};
+
+// Add round key step
+static void add_round_key(uint8_t *state, uint8_t *round_key) {
+    for (int i = 0; i < 16; i++) {
+        state[i] ^= round_key[i];
+    }
+}
+
+// Substitute bytes using the S-box
+static void sub_bytes(uint8_t *state) {
+    for (int i = 0; i < 16; i++) {
+        state[i] = sbox[state[i]];
+    }
+}
+
+// Inverse substitute bytes using the inverse S-box
+static void inv_sub_bytes(uint8_t *state) {
+    for (int i = 0; i < 16; i++) {
+        state[i] = inv_sbox[state[i]];
+    }
+}
+
+// Shift rows step (left shift each row by its row number)
+static void shift_rows(uint8_t *state) {
+    uint8_t temp;
+
+    // Row 1 shift (1-byte left)
+    temp = state[1];
+    state[1] = state[5];
+    state[5] = state[9];
+    state[9] = state[13];
+    state[13] = temp;
+
+    // Row 2 shift (2-byte left)
+    temp = state[2];
+    state[2] = state[10];
+    state[10] = temp;
+    temp = state[6];
+    state[6] = state[14];
+    state[14] = temp;
+
+    // Row 3 shift (3-byte left)
+    temp = state[3];
+    state[3] = state[15];
+    state[15] = state[11];
+    state[11] = state[7];
+    state[7] = temp;
+}
+
+// Inverse ShiftRows step (right shift each row by its row number)
+static void inv_shift_rows(uint8_t *state) {
+    uint8_t temp;
+
+    // Row 1 shift (1-byte right)
+    temp = state[13];
+    state[13] = state[9];
+    state[9] = state[5];
+    state[5] = state[1];
+    state[1] = temp;
+
+    // Row 2 shift (2-byte right)
+    temp = state[2];
+    state[2] = state[10];
+    state[10] = temp;
+    temp = state[6];
+    state[6] = state[14];
+    state[14] = temp;
+
+    // Row 3 shift (3-byte right)
+    temp = state[3];
+    state[3] = state[7];
+    state[7] = state[11];
+    state[11] = state[15];
+    state[15] = temp;
+}
+
+// Galois field multiplication for MixColumns
+static uint8_t gmul(uint8_t a, uint8_t b) {
+    uint8_t p = 0;
+    while (b) {
+        if (b & 1) p ^= a;
+        if (a & 0x80) a = (a << 1) ^ 0x1b;
+        else a <<= 1;
+        b >>= 1;
+    }
+    return p;
+}
+
+// MixColumns step
+static void mix_columns(uint8_t *state) {
+    for (int i = 0; i < 4; i++) {
+        uint8_t a = state[i * 4 + 0];
+        uint8_t b = state[i * 4 + 1];
+        uint8_t c = state[i * 4 + 2];
+        uint8_t d = state[i * 4 + 3];
+
+        state[i * 4 + 0] = gmul(a, 0x02) ^ gmul(b, 0x03) ^ c ^ d;
+        state[i * 4 + 1] = a ^ gmul(b, 0x02) ^ gmul(c, 0x03) ^ d;
+        state[i * 4 + 2] = a ^ b ^ gmul(c, 0x02) ^ gmul(d, 0x03);
+        state[i * 4 + 3] = gmul(a, 0x03) ^ b ^ c ^ gmul(d, 0x02);
+    }
+}
+
+// Inverse MixColumns step
+static void inv_mix_columns(uint8_t *state) {
+    for (int i = 0; i < 4; i++) {
+        uint8_t a = state[i * 4 + 0];
+        uint8_t b = state[i * 4 + 1];
+        uint8_t c = state[i * 4 + 2];
+        uint8_t d = state[i * 4 + 3];
+
+        state[i * 4 + 0] = gmul(a, 0x0e) ^ gmul(b, 0x0b) ^ gmul(c, 0x0d) ^ gmul(d, 0x09);
+        state[i * 4 + 1] = gmul(a, 0x09) ^ gmul(b, 0x0e) ^ gmul(c, 0x0b) ^ gmul(d, 0x0d);
+        state[i * 4 + 2] = gmul(a, 0x0d) ^ gmul(b, 0x09) ^ gmul(c, 0x0e) ^ gmul(d, 0x0b);
+        state[i * 4 + 3] = gmul(a, 0x0b) ^ gmul(b, 0x0d) ^ gmul(c, 0x09) ^ gmul(d, 0x0e);
+    }
+}
+
+// Perform AES encryption
+void aes_encrypt(uint8_t *message, uint8_t *key) {
+    uint8_t state[16];
+    memcpy(state, message, 16);
+
+    // Perform the initial round key addition
+    add_round_key(state, key);
+
+    // Perform 9 rounds of AES transformations
+    for (int round = 0; round < 9; round++) {
+        sub_bytes(state);
+        shift_rows(state);
+        mix_columns(state);
+        add_round_key(state, key);  // Using the same key as a placeholder
+    }
+
+    // Final round (no MixColumns)
+    sub_bytes(state);
+    shift_rows(state);
+    add_round_key(state, key);
+
+    // Copy the result back into the message
+    memcpy(message, state, 16);
+}
+
+// Perform AES decryption (inverse operations)
+void aes_decrypt(uint8_t *message, uint8_t *key) {
+    uint8_t state[16];
+    memcpy(state, message, 16);
+
+    // Initial round key addition (same as the last round of encryption)
+    add_round_key(state, key);
+
+    // Perform 9 rounds of inverse AES transformations
+    for (int round = 0; round < 9; round++) {
+        inv_shift_rows(state);
+        inv_sub_bytes(state);
+        add_round_key(state, key);  // Using the same key as a placeholder
+        inv_mix_columns(state);
+    }
+
+    // Final round (no InvMixColumns)
+    inv_shift_rows(state);
+    inv_sub_bytes(state);
+    add_round_key(state, key);
+
+    // Copy the result back into the message
+    memcpy(message, state, 16);
+}

Advanced-Encryption-Standard/src/main.c

@@ -0,0 +1,31 @@
+#include "aes.h"
+#include <stdio.h>
+#include <stdint.h>
+
+int main() {
+    // Example 128-bit key and plaintext (16 bytes each)
+    uint8_t message[16] = {0x32, 0x43, 0xf6, 0xa8, 0x88, 0x5a, 0x30, 0x8d,
+                           0x31, 0x31, 0x98, 0xa2, 0xe0, 0x37, 0x07, 0x34};
+    uint8_t key[16] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
+                       0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c};
+
+    printf("Original message: ");
+    for (int i = 0; i < 16; i++) printf("%02x ", message[i]);
+    printf("\n");
+
+    // Encrypt the message
+    aes_encrypt(message, key);
+
+    printf("Encrypted message: ");
+    for (int i = 0; i < 16; i++) printf("%02x ", message[i]);
+    printf("\n");
+
+    // Decrypt the message
+    aes_decrypt(message, key);
+
+    printf("Decrypted message: ");
+    for (int i = 0; i < 16; i++) printf("%02x ", message[i]);
+    printf("\n");
+
+    return 0;
+}