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p3elvfktj/AES/source/ECB/aes.c

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AES算法
5 years ago
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "aes.h"
int one;
int two;
int three;
int four;
int index;
int result;
int pArray[4][4];
int cArray[4][4];
int wArray[4][4];
int i,k;
/**
* S<EFBFBD><EFBFBD>
*/
static const int S[16][16] = { 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 };
/**
* <EFBFBD><EFBFBD>S<EFBFBD><EFBFBD>
*/
static const int S2[16][16] = { 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 };
/**
* <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݵĵ<EFBFBD>8λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>4<EFBFBD><EFBFBD>λ
*/
static int getLeft4Bit(int num) {
int left = num & 0x000000f0;
return left >> 4;
}
/**
* <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݵĵ<EFBFBD>8λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>4<EFBFBD><EFBFBD>λ
*/
static int getRight4Bit(int num) {
return num & 0x0000000f;
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>S<EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD>
*/
static int getNumFromSBox(int index) {
int row = getLeft4Bit(index);
int col = getRight4Bit(index);
return S[row][col];
}
/**
* <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*/
static int getIntFromChar(char c) {
int result = (int) c;
return result & 0x000000ff;
}
/**
* <EFBFBD><EFBFBD>16<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD>4X4<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>飬
* <EFBFBD>þ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֽڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD>£<EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>С<EFBFBD>
*/
static void convertToIntArray(char *str, int pa[4][4]) {
int k = 0,i=0,j=0;
for(i = 0; i < 4; i++)
for(j = 0; j < 4; j++) {
pa[j][i] = getIntFromChar(str[k]);
k++;
}
}
/**
* <EFBFBD><EFBFBD>ӡ4X4<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*/
static void printArray(int a[4][4]) {
int i,j;
for(i = 0; i < 4; i++){
for(j = 0; j < 4; j++)
printf("a[%d][%d] = 0x%x ", i, j, a[i][j]);
printf("\n");
}
printf("\n");
}
/**
* <EFBFBD><EFBFBD>ӡ<EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ASSCI<EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>ʮ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD>
*/
static void printASSCI(char *str, int len) {
int i;
for(i = 0; i < len; i++)
printf("0x%x ", getIntFromChar(str[i]));
printf("\n");
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>4<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD>ϲ<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>4<EFBFBD>ֽڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*/
static int getWordFromStr(char *str)
{
one = getIntFromChar(str[0]);
one = one << 24;
two = getIntFromChar(str[1]);
two = two << 16;
three = getIntFromChar(str[2]);
three = three << 8;
four = getIntFromChar(str[3]);
return one | two | three | four;
}
/**
* <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>4<EFBFBD>ֽڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD><EFBFBD>ֽ<EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>4<EFBFBD><EFBFBD>Ԫ<EFBFBD>ص<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>档
*/
static void splitIntToArray(int num, int array[4]) {
one = num >> 24;
array[0] = one & 0x000000ff;
two = num >> 16;
array[1] = two & 0x000000ff;
three = num >> 8;
array[2] = three & 0x000000ff;
array[3] = num & 0x000000ff;
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>Ԫ<EFBFBD><EFBFBD>ѭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>stepλ
*/
static void leftLoop4int(int array[4], int step) {
int temp[4];
int i;
for(i = 0; i < 4; i++)
temp[i] = array[i];
index = step % 4 == 0 ? 0 : step % 4;
for(i = 0; i < 4; i++){
array[i] = temp[index];
index++;
index = index % 4;
}
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еĵ<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD>طֱ<EFBFBD><EFBFBD><EFBFBD>Ϊ
* 4<EFBFBD>ֽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>͵ĵ<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֽڣ<EFBFBD><EFBFBD>ϲ<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>4<EFBFBD>ֽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*/
static int mergeArrayToInt(int array[4]) {
int one = array[0] << 24;
int two = array[1] << 16;
int three = array[2] << 8;
int four = array[3];
return one | two | three | four;
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD>
*/
static const int Rcon[10] = { 0x01000000, 0x02000000,
0x04000000, 0x08000000,
0x10000000, 0x20000000,
0x40000000, 0x80000000,
0x1b000000, 0x36000000 };
/**
* <EFBFBD><EFBFBD>Կ<EFBFBD><EFBFBD>չ<EFBFBD>е<EFBFBD>T<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*/
static int T(int num, int round) {
int numArray[4];
splitIntToArray(num, numArray);
leftLoop4int(numArray, 1);//<2F><>ѭ<EFBFBD><D1AD>
//<2F>ֽڴ<D6BD><DAB4><EFBFBD>
for(i = 0; i < 4; i++)
numArray[i] = getNumFromSBox(numArray[i]);
result = mergeArrayToInt(numArray);
return result ^ Rcon[round];
}
//<2F><>Կ<EFBFBD><D4BF>Ӧ<EFBFBD><D3A6><EFBFBD><EFBFBD>չ<EFBFBD><D5B9><EFBFBD><EFBFBD>
static int w[44];
/**
* <EFBFBD><EFBFBD>չ<EFBFBD><EFBFBD>Կ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD>w[44]<EFBFBD>е<EFBFBD>ÿ<EFBFBD><EFBFBD>Ԫ<EFBFBD>س<EFBFBD>ʼ<EFBFBD><EFBFBD>
*/
static void extendKey(char *key)
{
int i,j;
for(i = 0; i < 4; i++)
w[i] = getWordFromStr(key + i * 4);
for(i = 4, j = 0; i < 44; i++)
{
if( i % 4 == 0)
{
w[i] = w[i - 4] ^ T(w[i - 1], j);
j++;//<2F><>һ<EFBFBD><D2BB>
}
else
w[i] = w[i - 4] ^ w[i - 1];
}
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>Կ<EFBFBD><EFBFBD>
*/
static void addRoundKey(int array[4][4], int round) {
int warray[4];
int i,j;
for(i = 0; i < 4; i++) {
splitIntToArray(w[ round * 4 + i], warray);
for(j = 0; j < 4; j++) {
array[j][i] = array[j][i] ^ warray[j];
}
}
}
/**
* <EFBFBD>ֽڴ<EFBFBD><EFBFBD><EFBFBD>
*/
static void subBytes(int array[4][4]){
int i,j;
for(i = 0; i < 4; i++)
for( j = 0; j < 4; j++)
array[i][j] = getNumFromSBox(array[i][j]);
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ
*/
static void shiftRows(int array[4][4]) {
int rowTwo[4], rowThree[4], rowFour[4];
//<2F><><EFBFBD><EFBFBD>״̬<D7B4><CCAC><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD>2,3,4<><34>
int i;
for(i = 0; i < 4; i++) {
rowTwo[i] = array[1][i];
rowThree[i] = array[2][i];
rowFour[i] = array[3][i];
}
//ѭ<><D1AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6>λ<EFBFBD><CEBB>
leftLoop4int(rowTwo, 1);
leftLoop4int(rowThree, 2);
leftLoop4int(rowFour, 3);
//<2F><><EFBFBD><EFBFBD><EFBFBD>ƺ<EFBFBD><C6BA><EFBFBD><EFBFBD>и<EFBFBD><D0B8>ƻ<EFBFBD>״̬<D7B4><CCAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
for( i = 0; i < 4; i++) {
array[1][i] = rowTwo[i];
array[2][i] = rowThree[i];
array[3][i] = rowFour[i];
}
}
/**
* <EFBFBD>л<EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD>õ<EFBFBD><EFBFBD>ľ<EFBFBD><EFBFBD><EFBFBD>
*/
static const int colM[4][4] = { 2, 3, 1, 1,
1, 2, 3, 1,
1, 1, 2, 3,
3, 1, 1, 2 };
static int GFMul2(int s) {
int result = s << 1;
int a7 = result & 0x00000100;
if(a7 != 0) {
result = result & 0x000000ff;
result = result ^ 0x1b;
}
return result;
}
static int GFMul3(int s) {
return GFMul2(s) ^ s;
}
static int GFMul4(int s) {
return GFMul2(GFMul2(s));
}
static int GFMul8(int s) {
return GFMul2(GFMul4(s));
}
static int GFMul9(int s) {
return GFMul8(s) ^ s;
}
static int GFMul11(int s) {
return GFMul9(s) ^ GFMul2(s);
}
static int GFMul12(int s) {
return GFMul8(s) ^ GFMul4(s);
}
static int GFMul13(int s) {
return GFMul12(s) ^ s;
}
static int GFMul14(int s) {
return GFMul12(s) ^ GFMul2(s);
}
/**
* GF<EFBFBD>ϵĶ<EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*/
static int GFMul(int n, int s) {
int result;
if(n == 1)
result = s;
else if(n == 2)
result = GFMul2(s);
else if(n == 3)
result = GFMul3(s);
else if(n == 0x9)
result = GFMul9(s);
else if(n == 0xb)//11
result = GFMul11(s);
else if(n == 0xd)//13
result = GFMul13(s);
else if(n == 0xe)//14
result = GFMul14(s);
return result;
}
/**
* <EFBFBD>л<EFBFBD><EFBFBD><EFBFBD>
*/
static void mixColumns(int array[4][4]) {
int tempArray[4][4];
int i,j;
for(i = 0; i < 4; i++)
for(j = 0; j < 4; j++)
tempArray[i][j] = array[i][j];
for(i = 0; i < 4; i++)
for(j = 0; j < 4; j++){
array[i][j] = GFMul(colM[i][0],tempArray[0][j]) ^ GFMul(colM[i][1],tempArray[1][j])
^ GFMul(colM[i][2],tempArray[2][j]) ^ GFMul(colM[i][3], tempArray[3][j]);
}
}
/**
* <EFBFBD><EFBFBD>4X4<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>
*/
static void convertArrayToStr(int array[4][4], char *str) {
int i,j;
for(i = 0; i < 4; i++)
for(j = 0; j < 4; j++)
*str++ = (char)array[j][i];
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Կ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*/
static int checkKeyLen(int len) {
if(len == 16)
return 1;
else
return 0;
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> p: <EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>顣
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> plen: <EFBFBD><EFBFBD><EFBFBD>ĵij<EFBFBD><EFBFBD>ȡ<EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> key: <EFBFBD><EFBFBD>Կ<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>顣
*/
void aes(char *p, int plen, char *key){
int keylen = strlen(key);
if(!checkKeyLen(keylen)) {
printf("keylen erro;keylen=%d\n",keylen);
exit(0);
}
extendKey(key);//<2F><>չ<EFBFBD><D5B9>Կ
for(k = 0; k < plen; k += 16) {
convertToIntArray(p + k, pArray);
addRoundKey(pArray, 0);//һ<><D2BB>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Կ<EFBFBD><D4BF>
for(i = 1; i < 10; i++){//ǰ9<C7B0><39>
subBytes(pArray);//<2F>ֽڴ<D6BD><DAB4><EFBFBD>
shiftRows(pArray);//<2F><><EFBFBD><EFBFBD>λ
mixColumns(pArray);//<2F>л<EFBFBD><D0BB><EFBFBD>
addRoundKey(pArray, i);
}
//<2F><>10<31><30>
subBytes(pArray);//<2F>ֽڴ<D6BD><DAB4><EFBFBD>
shiftRows(pArray);//<2F><><EFBFBD><EFBFBD>λ
addRoundKey(pArray, 10);
convertArrayToStr(pArray, p + k);
}
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>S<EFBFBD><EFBFBD><EFBFBD>л<EFBFBD>ȡֵ
*/
static int getNumFromS1Box(int index) {
int row = getLeft4Bit(index);
int col = getRight4Bit(index);
return S2[row][col];
}
/**
* <EFBFBD><EFBFBD><EFBFBD>ֽڱ任
*/
static void deSubBytes(int array[4][4]) {
int i,j;
for( i = 0; i < 4; i++)
for(j = 0; j < 4; j++)
array[i][j] = getNumFromS1Box(array[i][j]);
}
/**
* <EFBFBD><EFBFBD>4<EFBFBD><EFBFBD>Ԫ<EFBFBD>ص<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>stepλ
*/
static void rightLoop4int(int array[4], int step) {
int temp[4];
int i;
for(i = 0; i < 4; i++)
temp[i] = array[i];
index = step % 4 == 0 ? 0 : step % 4;
index = 3 - index;
for(i = 3; i >= 0; i--) {
array[i] = temp[index];
index--;
index = index == -1 ? 3 : index;
}
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ
*/
static void deShiftRows(int array[4][4]) {
int rowTwo[4], rowThree[4], rowFour[4];
int i;
for(i = 0; i < 4; i++) {
rowTwo[i] = array[1][i];
rowThree[i] = array[2][i];
rowFour[i] = array[3][i];
}
rightLoop4int(rowTwo, 1);
rightLoop4int(rowThree, 2);
rightLoop4int(rowFour, 3);
for(i = 0; i < 4; i++) {
array[1][i] = rowTwo[i];
array[2][i] = rowThree[i];
array[3][i] = rowFour[i];
}
}
/**
* <EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD><EFBFBD>ľ<EFBFBD><EFBFBD><EFBFBD>
*/
static const int deColM[4][4] = { 0xe, 0xb, 0xd, 0x9,
0x9, 0xe, 0xb, 0xd,
0xd, 0x9, 0xe, 0xb,
0xb, 0xd, 0x9, 0xe };
/**
* <EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD>
*/
static void deMixColumns(int array[4][4]) {
int tempArray[4][4];
int i,j;
for(i = 0; i < 4; i++)
for(j = 0; j < 4; j++)
tempArray[i][j] = array[i][j];
for(i = 0; i < 4; i++)
for(j = 0; j < 4; j++){
array[i][j] = GFMul(deColM[i][0],tempArray[0][j]) ^ GFMul(deColM[i][1],tempArray[1][j])
^ GFMul(deColM[i][2],tempArray[2][j]) ^ GFMul(deColM[i][3], tempArray[3][j]);
}
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>4X4<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*/
static void addRoundTowArray(int aArray[4][4],int bArray[4][4]) {
int i,j;
for(i = 0; i < 4; i++)
for(j = 0; j < 4; j++)
aArray[i][j] = aArray[i][j] ^ bArray[i][j];
}
/**
* <EFBFBD><EFBFBD>4<EFBFBD><EFBFBD>32λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Կ<EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD>4X4<EFBFBD><EFBFBD><EFBFBD>飬
* <EFBFBD><EFBFBD><EFBFBD>ڽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD>
*/
static void getArrayFrom4W(int i, int array[4][4]) {
int index = i * 4;
int colOne[4], colTwo[4], colThree[4], colFour[4];
splitIntToArray(w[index], colOne);
splitIntToArray(w[index + 1], colTwo);
splitIntToArray(w[index + 2], colThree);
splitIntToArray(w[index + 3], colFour);
for(i = 0; i < 4; i++) {
array[i][0] = colOne[i];
array[i][1] = colTwo[i];
array[i][2] = colThree[i];
array[i][3] = colFour[i];
}
}
/**
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> c: <EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>顣
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> clen: <EFBFBD><EFBFBD><EFBFBD>ĵij<EFBFBD><EFBFBD>ȡ<EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> key: <EFBFBD><EFBFBD>Կ<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>顣
*/
void deAes(char *c, int clen, char *key) {
int keylen = strlen(key);
if(clen == 0 || clen % 16 != 0) {
printf("Ciphertext characters must be a multiple of 16! Now the length is zero:%d\n",clen);
exit(0);
}
if(!checkKeyLen(keylen)) {
printf("Key character length error! The lengths must be 16, 24, and 32. The current length is:%d\n",keylen);
exit(0);
}
extendKey(key);//<2F><>չ<EFBFBD><D5B9>Կ
for(k = 0; k < clen; k += 16) {
convertToIntArray(c + k, cArray);
addRoundKey(cArray, 10);
for(i = 9; i >= 1; i--) {
deSubBytes(cArray);
deShiftRows(cArray);
deMixColumns(cArray);
getArrayFrom4W(i, wArray);
deMixColumns(wArray);
addRoundTowArray(cArray, wArray);
}
deSubBytes(cArray);
deShiftRows(cArray);
addRoundKey(cArray, 0);
convertArrayToStr(cArray, c + k);
}
}