aes加密算法的c代码
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⑵ 求AES加密算法 C代码
以前编过的，c++可以用的
#include <iostream>
using namespace std;
long gcd(long a, long b)
{
if(b>a) //a中存放较大的数，b中存放较小的数
{
int temp;
temp=a;
a=b;
b=temp;
}
long n;
while((n=a%b)!=0)
{
a=b;
b=n;
}
return b;
}
//---------------------------------------
long cheng_niyuan(long a, long b)
{
for(long i=1; (i*a)%b!=1; i++);
return i;
}
//---------------------------------------
int mi_mo(int a, int b, int n)
{
int K[100];
int top=-1;
while(b)
{
top++;
K[top]=(b%2);
b/=2;
}
int c=0, f=1;
for(; top>=0; top--)
{
c=2*c;
f=(f*f)%n;
if(K[top]==1)
{
c+=1;
f=(f*a)%n;
}
}
return f;
}
//---------------------------------------
int main()
{
int p=5,q=11;
cout<<"p="<<p<<endl;
cout<<"q="<<q<<endl;
long int n=p*q;
cout<<"n="<<n<<endl;
long int fi_n=(p-1)*(q-1);
cout<<"fi_n="<<fi_n<<endl;
int e=3;
cout<<"e="<<e<<endl;
long d=cheng_niyuan(e,fi_n);
int M, C;
cout<<"请输入明文："<<endl;
cin>>M;
C=mi_mo(M, e, n);
cout<<"对应的密文为："<<endl;
cout<<C<<endl;
cout<<"请输入密文："<<endl;
cin>>C;
M=mi_mo(C, d, n);
cout<<"对应的明文为："<<endl;
cout<<M<<endl;
return 0;
}
⑶ 谁会用C语言实现AES算法，谢谢
1 AES加密、解密算法原理和AVR实现
AES是分组密钥，算法输入128位数据，密钥长度也是128位。用Nr表示对一个数据分组加密的轮数（加密轮数与密钥长度的关系如表1所列）。每一轮都需要一个与输入分组具有相同长度的扩展密钥Expandedkey(i)的参与。由于外部输入的加密密钥K长度有限,所以在算法中要用一个密钥扩展程序(Keyexpansion)把外部密钥K扩展成更长的比特串,以生成各轮的加密和解密密钥。
1.1圈变化
AES每一个圈变换由以下三个层组成:
非线性层——进行Subbyte变换；
线行混合层——进行ShiftRow和MixColumn运算；
密钥加层——进行AddRoundKey运算。
① Subbyte变换是作用在状态中每个字节上的一种非线性字节转换,可以通过计算出来的S盒进行映射。
Schange:
ldi zh,＄01;将指针指向S盒的首地址
mov zl,r2；将要查找的数据作为指针低地址
ldtemp,z+；取出这个对应的数据
mov r2,temp；交换数据完成查表
.
.
.
ret
② ShiftRow是一个字节换位。它将状态中的行按照不同的偏移量进行循环移位，而这个偏移量也是根据Nb的不同而选择的[3]。
shiftrow:;这是一个字节换位的子程序
mov temp,r3;因为是4×4
mov r3,r7; r2 r6 r10 r14 r2 r6 r10 r14
mov r7,r11; r3 r7 r11 r15---r7 r11 r15 r3
mov r11,r15; r4 r8 r12 r17 r12 r17 r4 r8
mov r15,temp; r5 r9 r13 r18 r18 r5 r9 r13
mov temp,r4
mov temp1,r8
mov r4,r12
mov r8,r17
mov r12,temp
mov r17,temp1
mov temp,r18
mov r18,r13
mov r13,r9
mov r9,r5
mov r5,temp
ret
③ 在MixColumn变换中,把状态中的每一列看作GF(28)上的多项式a(x)与固定多项式c(x)相乘的结果。b(x)=c(x)*a(x)的系数这样计算:*运算不是普通的乘法运算,而是特殊的运算，即
b(x)=c(x)·a(x)(mod x4+1)
对于这个运算
b0=02。a0+03。a1+a2+a3
令xtime(a0)=02。a0
其中，符号“。”表示模一个八次不可约多项式的同余乘法[3]。
mov temp,a0;这是一个mixcolimn子程序
rcall xtime;调用xtime程序
mov a0,temp
mov temp,a1
rcall xtime
eor a0,a1
eor a0,temp
eor a0,a2
eor a0,a3;完成b(x)的计算
.
.
.
xtime:;这是一个子程序
ldi temp1,＄1b
lsl temp
brcs next1;如果最高位是1,则转移
next: ret;否则什么也不变化
next1:eor temp,temp1
rjmp next
对于逆变化,其矩阵C要改变成相应的D,即b(x)=d(x)＊a(x)。
④ 密钥加层运算(addround)是将圈密钥状态中的对应字节按位“异或”。
⑤ 根据线性变化的性质[1],解密运算是加密变化的逆变化。这里不再详细叙述。
1.2轮变化
对不同的分组长度，其对应的轮变化次数是不同的,如表1所列。
1.3密钥扩展
AES算法利用外部输入密钥K(密钥串的字数为Nk),通过密钥的扩展程序得到共计4(Nr+1)字的扩展密钥。它涉及如下三个模块:
① 位置变换(rotword)——把一个4字节的序列[A,B,C,D]变化成[B,C,D,A]；
② S盒变换(subword)——对一个4字节进行S盒代替；
③ 变换Rcon[i]——Rcon[i]表示32位比特字[xi-1,00,00,00]。这里的x是（02），如
Rcon[1]=[01000000]；Rcon[2]=[02000000]；Rcon[3]=[04000000]……
扩展密钥的生成：扩展密钥的前Nk个字就是外部密钥K；以后的字W[[i]]等于它前一个字W[[i-1]]与前第Nk个字W[[i-Nk]]的“异或”,即W[[i]]=W[[i-1]]�W[[i- Nk]]。但是若i为Nk的倍数,则W[i]=W[i-Nk]�Subword(Rotword(W[[i-1]]))�Rcon[i/Nk]。
程序执行的时候,主要调用以上几个子程序，具体实现如下：
Keyexpansion:
rcall rotwoed
rcall subword
rcall Rcon
.
.
.
2 AES加密、解密算法的优化
由以上算法的流程中可以清楚地看到，整个算法中程序耗时最多的就是圈变化部分，因此对于算法的优化也就在此；而圈变化部分可以优化的也就是列变化。因为列变化是一个模乘同余规则。由于AES加密和解密是不对称的,如果不对其进行优化,会使算法的解密速度远远大于加密的速度[1]。
① 加密运算。对列变换（Mixcolumn）可以通过调用xtime子程序进行优化。
另一种有效的优化方法就是离线构造一个表格，即列变化表格。这样只要通过查表的方式就可以提高加密速度。
② 解密算法的优化。由于解密的列变换的系数分别是09、0E、0B和0D。在AVR单片机上实现以上的乘法显然是需要很多的时间,从而导致了解密的性能降低。
优化方法一：对列变化进行分解使倍乘次数降低。
仔细研究解密矩阵的系数，不难发现解密矩阵和加密矩阵有着一定的联系，即解密矩阵等于加密矩阵和一个矩阵的相乘。通过这样的联系，就可以对算法进行优化：
这样一来,只用几个简单的“异或”就可以实现列变化，使倍乘的次数降低,提高解密的速度。
优化方法二：构造表格。
同加密构造方法一样，可以构造四个表格T[ea]=e×a; T[9a]=9×a;T[9a]=9×a;T[ba]=b×a。这样一来，也只需要进行查表和简单的异或就可以完成解密的任务。虽然这种方法将增加额外的开销,但是它却是一种有效的方法。
3 AES加密与解密的实验仿真
根据以上实验步骤和优化方法得出表2、3所列实验结果。
设主密钥为:(128bit)。
加密明文:。
密文:。
解密密文:。
明文:。
总之,AES密码是一个非对称密码体制，它的解密要比加密复杂和费时。解密优化算法没有增加存储空间的基础上,以列变化为基础进行处理，程序比原始的要小，而且节约了时间。解密优化方法速度最快，效率最高，但要增加系统的存储空间,因此它的程序也是最大的一个
流程图省略 朋友参考吧
⑷ 求C语言（不是C++）编写的AES加密程序，能在C-FREE里运行 简单就好 求能用
char keyMaterial[256];
int cnt = 0;
while(cnt < keylen/8) {
for (j = 0; rawkey[j]; j++) {
idx = j % (keylen/8);
ctmp = rawkey[idx];
if (idx != j)
ctmp = rawkey[idx] ^ rawkey[j];
ctmp += cnt;
mdx = (cnt + idx) % (keylen/8);
keyMaterial[2*mdx] = ((tmp=ctmp/16)>9)? tmp+'A'-10 : tmp+'0';
keyMaterial[2*mdx+1] = ((tmp=ctmp%16)>9)? tmp+'A'-10 : tmp+'0';
}
cnt += j;
}
keyMaterial[keylen/4] = 0;
⑸ aes加密算法C代码
完整的！
#include "stdio.h"
#include "memory.h"
#include "time.h"
#include "stdlib.h"
#define PLAIN_FILE_OPEN_ERROR -1
#define KEY_FILE_OPEN_ERROR -2
#define CIPHER_FILE_OPEN_ERROR -3
#define OK 1
typedef char ElemType;
/*初始置换表IP*/
int IP_Table[64] = { 57,49,41,33,25,17,9,1,
59,51,43,35,27,19,11,3,
61,53,45,37,29,21,13,5,
63,55,47,39,31,23,15,7,
56,48,40,32,24,16,8,0,
58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,30,22,14,6};
/*逆初始置换表IP^-1*/
int IP_1_Table[64] = {39,7,47,15,55,23,63,31,
38,6,46,14,54,22,62,30,
37,5,45,13,53,21,61,29,
36,4,44,12,52,20,60,28,
35,3,43,11,51,19,59,27,
34,2,42,10,50,18,58,26,
33,1,41,9,49,17,57,25,
32,0,40,8,48,16,56,24};
/*扩充置换表E*/
int E_Table[48] = {31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8,
7, 8,9,10,11,12,
11,12,13,14,15,16,
15,16,17,18,19,20,
19,20,21,22,23,24,
23,24,25,26,27,28,
27,28,29,30,31, 0};
/*置换函数P*/
int P_Table[32] = {15,6,19,20,28,11,27,16,
0,14,22,25,4,17,30,9,
1,7,23,13,31,26,2,8,
18,12,29,5,21,10,3,24};
/*S盒*/
int S[8][4][16] =
/*S1*/
{{{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7},
{0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8},
{4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0},
{15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}},
/*S2*/
{{15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10},
{3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5},
{0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15},
{13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}},
/*S3*/
{{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8},
{13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1},
{13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7},
{1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12}},
/*S4*/
{{7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15},
{13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9},
{10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4},
{3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14}},
/*S5*/
{{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9},
{14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6},
{4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14},
{11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}},
/*S6*/
{{12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11},
{10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8},
{9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6},
{4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}},
/*S7*/
{{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1},
{13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6},
{1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2},
{6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}},
/*S8*/
{{13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7},
{1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2},
{7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8},
{2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}}};
/*置换选择1*/
int PC_1[56] = {56,48,40,32,24,16,8,
0,57,49,41,33,25,17,
9,1,58,50,42,34,26,
18,10,2,59,51,43,35,
62,54,46,38,30,22,14,
6,61,53,45,37,29,21,
13,5,60,52,44,36,28,
20,12,4,27,19,11,3};
/*置换选择2*/
int PC_2[48] = {13,16,10,23,0,4,2,27,
14,5,20,9,22,18,11,3,
25,7,15,6,26,19,12,1,
40,51,30,36,46,54,29,39,
50,44,32,46,43,48,38,55,
33,52,45,41,49,35,28,31};
/*对左移次数的规定*/
int MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
int ByteToBit(ElemType ch,ElemType bit[8]);
int BitToByte(ElemType bit[8],ElemType *ch);
int Char8ToBit64(ElemType ch[8],ElemType bit[64]);
int Bit64ToChar8(ElemType bit[64],ElemType ch[8]);
int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]);
int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]);
int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]);
int DES_ROL(ElemType data[56], int time);
int DES_IP_Transform(ElemType data[64]);
int DES_IP_1_Transform(ElemType data[64]);
int DES_E_Transform(ElemType data[48]);
int DES_P_Transform(ElemType data[32]);
int DES_SBOX(ElemType data[48]);
int DES_XOR(ElemType R[48], ElemType L[48],int count);
int DES_Swap(ElemType left[32],ElemType right[32]);
int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]);
int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48], ElemType plainBlock[8]);
int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile);
int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile);
/*字节转换成二进制*/
int ByteToBit(ElemType ch, ElemType bit[8]){
int cnt;
for(cnt = 0;cnt < 8; cnt++){
*(bit+cnt) = (ch>>cnt)&1;
}
return 0;
}
/*二进制转换成字节*/
int BitToByte(ElemType bit[8],ElemType *ch){
int cnt;
for(cnt = 0;cnt < 8; cnt++){
*ch |= *(bit + cnt)<<cnt;
}
return 0;
}
/*将长度为8的字符串转为二进制位串*/
int Char8ToBit64(ElemType ch[8],ElemType bit[64]){
int cnt;
for(cnt = 0; cnt < 8; cnt++){
ByteToBit(*(ch+cnt),bit+(cnt<<3));
}
return 0;
}
/*将二进制位串转为长度为8的字符串*/
int Bit64ToChar8(ElemType bit[64],ElemType ch[8]){
int cnt;
memset(ch,0,8);
for(cnt = 0; cnt < 8; cnt++){
BitToByte(bit+(cnt<<3),ch+cnt);
}
return 0;
}
/*生成子密钥*/
int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]){
ElemType temp[56];
int cnt;
DES_PC1_Transform(key,temp);/*PC1置换*/
for(cnt = 0; cnt < 16; cnt++){/*16轮跌代，产生16个子密钥*/
DES_ROL(temp,MOVE_TIMES[cnt]);/*循环左移*/
DES_PC2_Transform(temp,subKeys[cnt]);/*PC2置换，产生子密钥*/
}
return 0;
}
/*密钥置换1*/
int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]){
int cnt;
for(cnt = 0; cnt < 56; cnt++){
tempbts[cnt] = key[PC_1[cnt]];
}
return 0;
}
/*密钥置换2*/
int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]){
int cnt;
for(cnt = 0; cnt < 48; cnt++){
tempbts[cnt] = key[PC_2[cnt]];
}
return 0;
}
/*循环左移*/
int DES_ROL(ElemType data[56], int time){
ElemType temp[56];
/*保存将要循环移动到右边的位*/
memcpy(temp,data,time);
memcpy(temp+time,data+28,time);
/*前28位移动*/
memcpy(data,data+time,28-time);
memcpy(data+28-time,temp,time);
/*后28位移动*/
memcpy(data+28,data+28+time,28-time);
memcpy(data+56-time,temp+time,time);
return 0;
}
/*IP置换*/
int DES_IP_Transform(ElemType data[64]){
int cnt;
ElemType temp[64];
for(cnt = 0; cnt < 64; cnt++){
temp[cnt] = data[IP_Table[cnt]];
}
memcpy(data,temp,64);
return 0;
}
/*IP逆置换*/
int DES_IP_1_Transform(ElemType data[64]){
int cnt;
ElemType temp[64];
for(cnt = 0; cnt < 64; cnt++){
temp[cnt] = data[IP_1_Table[cnt]];
}
memcpy(data,temp,64);
return 0;
}
/*扩展置换*/
int DES_E_Transform(ElemType data[48]){
int cnt;
ElemType temp[48];
for(cnt = 0; cnt < 48; cnt++){
temp[cnt] = data[E_Table[cnt]];
}
memcpy(data,temp,48);
return 0;
}
/*P置换*/
int DES_P_Transform(ElemType data[32]){
int cnt;
ElemType temp[32];
for(cnt = 0; cnt < 32; cnt++){
temp[cnt] = data[P_Table[cnt]];
}
memcpy(data,temp,32);
return 0;
}
/*异或*/
int DES_XOR(ElemType R[48], ElemType L[48] ,int count){
int cnt;
for(cnt = 0; cnt < count; cnt++){
R[cnt] ^= L[cnt];
}
return 0;
}
/*S盒置换*/
int DES_SBOX(ElemType data[48]){
int cnt;
int line,row,output;
int cur1,cur2;
for(cnt = 0; cnt < 8; cnt++){
cur1 = cnt*6;
cur2 = cnt<<2;
/*计算在S盒中的行与列*/
line = (data[cur1]<<1) + data[cur1+5];
row = (data[cur1+1]<<3) + (data[cur1+2]<<2)
+ (data[cur1+3]<<1) + data[cur1+4];
output = S[cnt][line][row];
/*化为2进制*/
data[cur2] = (output&0X08)>>3;
data[cur2+1] = (output&0X04)>>2;
data[cur2+2] = (output&0X02)>>1;
data[cur2+3] = output&0x01;
}
return 0;
}
/*交换*/
int DES_Swap(ElemType left[32], ElemType right[32]){
ElemType temp[32];
memcpy(temp,left,32);
memcpy(left,right,32);
memcpy(right,temp,32);
return 0;
}
/*加密单个分组*/
int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]){
ElemType plainBits[64];
ElemType Right[48];
int cnt;
Char8ToBit64(plainBlock,plainBits);
/*初始置换（IP置换）*/
DES_IP_Transform(plainBits);
/*16轮迭代*/
for(cnt = 0; cnt < 16; cnt++){
memcpy(Right,plainBits+32,32);
/*将右半部分进行扩展置换，从32位扩展到48位*/
DES_E_Transform(Right);
/*将右半部分与子密钥进行异或操作*/
DES_XOR(Right,subKeys[cnt],48);
/*异或结果进入S盒，输出32位结果*/
DES_SBOX(Right);
/*P置换*/
DES_P_Transform(Right);
/*将明文左半部分与右半部分进行异或*/
DES_XOR(plainBits,Right,32);
if(cnt != 15){
/*最终完成左右部的交换*/
DES_Swap(plainBits,plainBits+32);
}
}
/*逆初始置换（IP^1置换）*/
DES_IP_1_Transform(plainBits);
Bit64ToChar8(plainBits,cipherBlock);
return 0;
}
/*解密单个分组*/
int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48],ElemType plainBlock[8]){
ElemType cipherBits[64];
ElemType Right[48];
int cnt;
Char8ToBit64(cipherBlock,cipherBits);
/*初始置换（IP置换）*/
DES_IP_Transform(cipherBits);
/*16轮迭代*/
for(cnt = 15; cnt >= 0; cnt--){
memcpy(Right,cipherBits+32,32);
/*将右半部分进行扩展置换，从32位扩展到48位*/
DES_E_Transform(Right);
/*将右半部分与子密钥进行异或操作*/
DES_XOR(Right,subKeys[cnt],48);
/*异或结果进入S盒，输出32位结果*/
DES_SBOX(Right);
/*P置换*/
DES_P_Transform(Right);
/*将明文左半部分与右半部分进行异或*/
DES_XOR(cipherBits,Right,32);
if(cnt != 0){
/*最终完成左右部的交换*/
DES_Swap(cipherBits,cipherBits+32);
}
}
/*逆初始置换（IP^1置换）*/
DES_IP_1_Transform(cipherBits);
Bit64ToChar8(cipherBits,plainBlock);
return 0;
}
/*加密文件*/
int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile){
FILE *plain,*cipher;
int count;
ElemType plainBlock[8],cipherBlock[8],keyBlock[8];
ElemType bKey[64];
ElemType subKeys[16][48];
if((plain = fopen(plainFile,"rb")) == NULL){
return PLAIN_FILE_OPEN_ERROR;
}
if((cipher = fopen(cipherFile,"wb")) == NULL){
return CIPHER_FILE_OPEN_ERROR;
}
/*设置密钥*/
memcpy(keyBlock,keyStr,8);
/*将密钥转换为二进制流*/
Char8ToBit64(keyBlock,bKey);
/*生成子密钥*/
DES_MakeSubKeys(bKey,subKeys);
while(!feof(plain)){
/*每次读8个字节，并返回成功读取的字节数*/
if((count = fread(plainBlock,sizeof(char),8,plain)) == 8){
DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
fwrite(cipherBlock,sizeof(char),8,cipher);
}
}
if(count){
/*填充*/
memset(plainBlock + count,'\0',7 - count);
/*最后一个字符保存包括最后一个字符在内的所填充的字符数量*/
plainBlock[7] = 8 - count;
DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
fwrite(cipherBlock,sizeof(char),8,cipher);
}
fclose(plain);
fclose(cipher);
return OK;
}
/*解密文件*/
int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile){
FILE *plain, *cipher;
int count,times = 0;
long fileLen;
ElemType plainBlock[8],cipherBlock[8],keyBlock[8];
ElemType bKey[64];
ElemType subKeys[16][48];
if((cipher = fopen(cipherFile,"rb")) == NULL){
return CIPHER_FILE_OPEN_ERROR;
}
if((plain = fopen(plainFile,"wb")) == NULL){
return PLAIN_FILE_OPEN_ERROR;
}
/*设置密钥*/
memcpy(keyBlock,keyStr,8);
/*将密钥转换为二进制流*/
Char8ToBit64(keyBlock,bKey);
/*生成子密钥*/
DES_MakeSubKeys(bKey,subKeys);
/*取文件长度 */
fseek(cipher,0,SEEK_END);/*将文件指针置尾*/
fileLen = ftell(cipher); /*取文件指针当前位置*/
rewind(cipher); /*将文件指针重指向文件头*/
while(1){
/*密文的字节数一定是8的整数倍*/
fread(cipherBlock,sizeof(char),8,cipher);
DES_DecryptBlock(cipherBlock,subKeys,plainBlock);
times += 8;
if(times < fileLen){
fwrite(plainBlock,sizeof(char),8,plain);
}
else{
break;
}
}
/*判断末尾是否被填充*/
if(plainBlock[7] < 8){
for(count = 8 - plainBlock[7]; count < 7; count++){
if(plainBlock[count] != '\0'){
break;
}
}
}
if(count == 7){/*有填充*/
fwrite(plainBlock,sizeof(char),8 - plainBlock[7],plain);
}
else{/*无填充*/
fwrite(plainBlock,sizeof(char),8,plain);
}
fclose(plain);
fclose(cipher);
return OK;
}
int main()
{
clock_t a,b;
a = clock();
DES_Encrypt("1.txt","key.txt","2.txt");
b = clock();
printf("加密消耗%d毫秒\n",b-a);
system("pause");
a = clock();
DES_Decrypt("2.txt","key.txt","3.txt");
b = clock();
printf("解密消耗%d毫秒\n",b-a);
getchar();
return 0;
}
⑹ AES加密算法对”文件“进行加密。。要求用C++实现
1.加密，是以某种特殊的算法改变原有的信息数据，使得未授权的用户即使获得了已加密的信息，但因不知解密的方法，仍然无法了解信息的内容。例如对称算法亦或加密。
2.什么是异或算法
异或的特点是原始值经过两次异或某一个数后会变成原来的值，所以有时利用这个特性来进行加密，加密端把数据与一个密钥进行异或操作，生成密文。接收方收到密文后利用加密方提供的密钥进行再次异或操作就能得到明文。
3.例程：
/*以DWORD为单位对文件进行加密，将每个DWORD与0xfcba0000(密钥)做异或，写入另一个文件*/
#include
<stdio.h>
#include
<stdlib.h>
#define
DWORD
unsigned
long
#define
BYTE
unsigned
char
#define
false
0
#define
true
1
int
main(int
argc,
char
*argv[])
{
FILE
*hSource;
FILE
*hDestination;
DWORD
dwKey=0xfcba0000;
char*
pbBuffer;
DWORD
dwBufferLen=sizeof(DWORD);
DWORD
dwCount;
DWORD
dwData;
if(argv[1]==0||argv[2]==0)
{
printf("missing
argument!\n");
return
false;
}
char*
szSource=argv[1];
char*
szDestination=argv[2];
hSource
=
fopen(szSource,"rb");//
打开源文件.
hDestination
=
fopen(szDestination,"wb");
//打开目标文件
if
(hSource==NULL)
{printf("open
Source
File
error
!");
return
false
;}
if
(hDestination==NULL){
printf("open
Destination
File
error
!");
return
false
;}
//分配缓冲区
pbBuffer=(char*
)malloc(dwBufferLen);
do
{
//
从源文件中读出dwBlockLen个字节
dwCount
=
fread(pbBuffer,
1,
dwBufferLen,
hSource);
//加密数据
dwData
=
*(DWORD*)pbBuffer;
//char*
TO
dword
dwData^=dwKey;
//xor
operation
pbBuffer
=
(char
*)
&dwData;
//
将加密过的数据写入目标文件
fwrite(pbBuffer,
1,
dwCount,
hDestination);
}
while(!feof(hSource));
//关闭文件、释放内存
fclose(hSource);
fclose(hDestination);
printf("%s
is
encrypted
to
%s\n",szSource,szDestination);
return
0;
}
⑺ 使用C/C++语言,将DES/AES加密算法,用代码实现
哎，学校大作业吧。核心是des和aes的算法呗，自己一点点写代码量不很少呢。没时间给你写了。
不过有个很好的偷懒办法：建议lz你去找一下OpenSSL的源码。里面有AES，DES的原生C实现。现成函数。lz你直接从里面抠出来复制到你工程里就行了。。
⑻ ASE加密算法，C语言实现
Rijdeal的AES算法吧？
实现：
#include"stdio.h"
typedef unsigned char word8;
typedef unsigned int word32;
word8 Logtable[256] =
{
0,0,25,1,50,2,26,198,75,199,27,104,51,238,223,3,100,4,
224,14,52,141,129,239,76,113,8,200,248,105,28,193,125,194,29,
181,249,185,39,106,77,228,166,114,154,201,9,120,101,47,138,
5,33,15,225,36,18,240,130,69,53,147,218,142,150,143,219,189,
54,208,206,148,19,92,210,241,64,70,131,56,102,221,253,48,
191,6,139,98,179,37,226,152,34,136,145,16,126,110,72,195,163,
182,30,66,58,107,40,84,250,133,61,186,43,121,10,21,155,159,
94,202,78,212,172,229,243,115,167,87,175,88,168,80,244,234,
214,116,79,174,233,213,231,230,173,232,44,215,117,122,235,
22,11,245,89,203,95,176,156,169,81,160,127,12,246,111,23,196,
73,236,216,67,31,45,164,118,123,183,204,187,62,90,251,96,
177,134,59,82,161,108,170,85,41,157,151,178,135,144,97,190,
220,252,188,149,207,205,55,63,91,209,83,57,132,60,65,162,109,
71,20,42,158,93,86,242,211,171,68,17,146,217,35,32,46,137,
180,124,184,38,119,153,227,165,103,74,237,222,197,49,254,
24,13,99,140,128,192,247,112,7,
};
word8 Alogtable[256]=
{
1,3,5,15,17,51,85,255,26,46,114,150,161,248,19,53,95,225,
56,72,216,115,149,164,247,2,6,10,30,34,102,170,229,52,92,
228,55,89,235,38,106,190,217,112,144,171,230,49,83,245,4,12,
20,60,68,204,79,209,104,184,211,110,178,205,76,212,103,169,
224,59,77,215,98,166,241,8,24,40,120,136,131,158,185,208,107,
189,220,127,129,152,179,206,73,219,118,154,181,196,87,249,
16,48,80,240,11,29,39,105,187,214,97,163,254,25,43,125,135,
146,173,236,47,113,147,174,233,32,96,160,251,22,58,78,210,
109,183,194,93,231,50,86,250,21,63,65,195,94,226,61,71,201,
64,192,91,237,44,116,156,191,218,117,159,186,213,100,172,239,
42,126,130,157,188,223,122,142,137,128,155,182,193,88,232,
35,101,175,234,37,111,177,200,67,197,84,252,31,33,99,165,
244,7,9,27,45,119,153,176,203,70,202,69,207,74,222,121,139,
134,145,168,227,62,66,198,81,243,14,18,54,90,238,41,123,141,
140,143,138,133,148,167,242,13,23,57,75,221,124,132,151,162,
253,28,36,108,199,82,246,1,
};
word8 S[256]=
{
99,124,119,123,242,107,111,197,48,1,103,43,254,215,171,
118,202,130,201,125,250,89,71,240,173,212,162,175,156,164,
114,192,183,253,147,38,54,63,247,204,52,165,229,241,113,216,
49,21,4,199,35,195,24,150,5,154,7,18,128,226,235,39,178,117,
9,131,44,26,27,110,90,160,82,59,214,179,41,227,47,132,83,209,
0,237,32,252,177,91,106,203,190,57,74,76,88,207,208,239,
170,251,67,77,51,133,69,249,2,127,80,60,159,168,81,163,64,143,
146,157,56,245,188,182,218,33,16,255,243,210,205,12,19,236,
95,151,68,23,196,167,126,61,100,93,25,115,96,129,79,220,
34,42,144,136,70,238,184,20,222,94,11,219,224,50,58,10,73,6,
36,92,194,211,172,98,145,149,228,121,231,200,55,109,141,213,
78,169,108,86,244,234,101,122,174,8,186,120,37,46,28,166,
180,198,232,221,116,31,75,189,139,138,112,62,181,102,72,3,246,
14,97,53,87,185,134,193,29,158,225,248,152,17,105,217,142,
148,155,30,135,233,206,85,40,223,140,161,137,13,191,230,66,
104,65,153,45,15,176,84,187,22,
};
word8 Si[256]=
{
82,9,106,213,48,54,165,56,191,64,163,158,129,243,215,251,
124,227,57,130,155,47,255,135,52,142,67,68,196,222,233,203,
84,123,148,50,166,194,35,61,238,76,149,11,66,250,195,78,8,
46,161,102,40,217,36,178,118,91,162,73,109,139,209,37,114,
248,246,100,134,104,152,22,212,164,92,204,93,101,182,146,108,
112,72,80,253,237,185,218,94,21,70,87,167,141,157,132,144,
216,171,0,140,188,211,10,247,228,88,5,184,179,69,6,208,44,
30,143,202,63,15,2,193,175,189,3,1,19,138,107,58,145,17,65,
79,103,220,234,151,242,207,206,240,180,230,115,150,172,116,
34,231,173,53,133,226,249,55,232,28,117,223,110,71,241,26,
113,29,41,197,137,111,183,98,14,170,24,190,27,252,86,62,75,
198,210,121,32,154,219,192,254,120,205,90,244,31,221,168,51,
136,7,199,49,177,18,16,89,39,128,236,95,96,81,127,169,25,181,
74,13,45,229,122,159,147,201,156,239,160,224,59,77,174,42,
245,176,200,235,187,60,131,83,153,97,23,43,4,126,186,119,
214,38,225,105,20,99,85,33,12,125,
};
word32 Rc[30]=
{
0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1B,0x36,
0x6C,0xD8,0xAB,0x4D,0x9A,0x2F,0x5E,0xBC,0x63,0x97,0x35,
0x6A,0xD4,0xB3,0x7D,0xFA,0xEF,0xC5
};
#define MAXBC 8
#define MAXKC 8
#define MAXROUNDS 14
static word8 shifts[5][4]={
0,1,2,3,
0,1,2,3,
0,1,2,3,
0,1,2,4,
0,1,3,4,};
static int numrounds[5][5]={
10,11,12,13,14,
11,11,12,13,14,
12,12,12,13,14,
13,13,13,13,14,
14,14,14,14,14,};
int BC,KC,ROUNDS;
word8 mul(word8 a, word8 b){
//multiply two elements of GF(256)
//required for MixColumns and InvMixColumns
if (a&&b) return Alogtable[(Logtable[a]+Logtable[b])%255];
else return 0;
}
void AddRoundKey(word8 a[4][MAXBC],word8 rk[4][MAXBC])
{
//XOR corresponding text input and round key input bytes
int i,j;
for(i=0;i<4;i++)
for(j=0;j<BC;j++)
a[i][j]^=rk[i][j];
}
void SubBytes(word8 a[4][MAXBC],word8 box[256]){
//replace every byte if the input by the byte at that place
//in the non-linear S-box
int i,j;
for(i=0;i<4;i++)
for(j=0;i<BC;j++)
a[i][j]=box[a[i][j]];
}
void ShiftRows(word8 a[4][MAXBC],word8 d){
//row 0 remains unchanged
//the other three rows are shifted a variable amount
word8 tmp[MAXBC];
int i,j;
if(d==0){
for(i=0;i<4;i++){
for(j=0;j<BC;j++)
tmp[j]=a[i][(j+shifts[BC-4][i])%BC];
for(j=0;j<BC;j++) a[i][j]=tmp[j];
}
}
else {
for (i=0;i<4;i++){
for(j=0;j<BC;j++)
tmp[j]=a[i][(BC+j-shifts[BC-4][i])%BC];
for(j=0;j<BC;j++)
a[i][j]=tmp[j];
}
}
}
int main()
{
return 0;
}
密码制作者Joan Daemen和Vincent Rijmen的书上看到的，版权归出版商和作者，转载请注明出处
⑼ 初学者，求高手给一个完整的AES加密解密算法的程序(C/C++) 希望能满足如下要求
/*128bits密钥长度及分组长度AES加解密代码
*作者：Jeffrey.zhu
*/
⑽ 谁知道哪里有AES算法加密，解密c++/C语言代码
推荐用java，因为有现成的class给你用。。。如果用C++有好多东西需要自己写。可能java里面20行能搞定加密和解密的所有步骤，如果C++自己把所有算法加上各种数据类型转换之类的，无法估计多多少倍的代码了。前提还是你已经会写如果做密钥。