下面是c版本的
AES加密算法源代码
//AES.h
#define decrypt TRUE
#define encrypt FALSE
#define TYPE BOOL
typedef struct _AES{
int Nb
int Nr
int Nk
unsigned long *Word
unsigned long *State
}AES
/*
加密数据
byte *input 明文
byte *inSize 明文长
byte *out 密文存放的地方
byte *key 密钥key
byte *keySize 密钥长
*/
void Cipher(
unsigned char* input,
int inSize,
unsigned char* out,
unsigned char* key,
int keySize)
/*
解密数据
byte *input 密文
int *inSize 密文长
byte *out 明文存放的地方
byte *key 密钥key
int *keySize 密钥长
*/
void InvCipher(
unsigned char* input,
int inSize,
unsigned char* out,
unsigned char* key,
int keySize)
/*
生成加密用的参数AES结构
int inSize 块大小
byte* 密钥
int 密钥长
unsigned long 属性(标实类型)
返回AES结构指针
*/
AES *InitAES(AES *aes,
int inSize,
unsigned char* key,
int keySize, TYPE type)
/*
生成加密用的参数AES结构
int inSize 块大小
byte* 密钥
int 密钥长
返回AES结构指针
*/
AES *InitAES(
int inSize,
unsigned char* key,
int keySize, BOOL )
/*
加密时进行Nr轮运算
AES * aes 运行时参数
*/
void CipherLoop(
AES *aes)
/*
解密时进行Nr轮逆运算
AES * aes 运行时参数
*/
void InvCipherLoop(
AES *aes)
/*
释放AES结构和State和密钥库word
*/
void freeAES(
AES *aes)
//AES.cpp
#include "stdafx.h"
#include
#include
#include "AES.h"
unsigned char* SubWord(unsigned char* word)
unsigned long* keyExpansion(unsigned char* key, int Nk, int Nr,int)
/*
加密数据
byte *input 明文
byte *inSize 明文长
byte *out 密文存放的地方
byte *key 密钥key
byte *keySize 密钥长
*/
void Cipher(unsigned char* input, int inSize, unsigned char* out, unsigned char* key, int keySize)
{
AES aes
InitAES(&aes,inSize,key,keySize,encrypt)
memcpy(aes.State,input,inSize)
CipherLoop(&aes)
memcpy(out,aes.State,inSize)
}
/*
解密数据
byte *input 密文
int *inSize 密文长
byte *out 明文存放的地方
byte *key 密钥key
int *keySize 密钥长
*/
void InvCipher(unsigned char* input, int inSize, unsigned char* out, unsigned char* key, int keySize)
{
AES aes
InitAES(&aes,inSize,key,keySize,decrypt)
memcpy(aes.State,input,inSize)
InvCipherLoop(&aes)
memcpy(aes.State,out,inSize)
}
/*
生成加密用的参数AES结构
int inSize 块大小
byte* 密钥
int 密钥长
返回AES结构指针
*/
AES *InitAES(AES *aes,int inSize, unsigned char *key, int keySize, TYPE type)
{
int Nb = inSize >>2,
Nk = keySize >>2,
Nr = Nb <Nk ? Nk:Nb+6
aes->Nb = Nb
aes->Nk = Nk
aes->Nr = Nr
aes->Word = keyExpansion(key,Nb,Nr,Nk)
aes->State = new unsigned long[Nb+3]
if(type)
aes->State += 3
return aes
}
/*
生成加密用的参数AES结构
int inSize 块大小
byte* 密钥
int 密钥长
返回AES结构指针
*/
AES *InitAES(int inSize, unsigned char* key, int keySize,unsigned long type)
{
return InitAES(new AES(),inSize,key,keySize,type)
}
/*
*/
void CipherLoop(AES *aes)
{
unsigned char temp[4]
unsigned long *word8 = aes->Word,
*State = aes->State
int Nb = aes->Nb,
Nr = aes->Nr
int r
for (r = 0r <Nb++r)
{
State[r] ^= word8[r]
}
for (int round =1round {
word8 += Nb
/*
假设Nb=4
---------------------
| s0 | s1 | s2 | s3 |
---------------------
| s4 | s5 | s6 | s7 |
---------------------
| s8 | s9 | sa | sb |
---------------------
| sc | sd | se | sf |
---------------------
| | | | |
---------------------
| | | | |
---------------------
| | | | |
---------------------
*/
memcpy(State+Nb,State,12)
/*
Nb=4
---------------------
| s0 | | | |
---------------------
| s4 | s5 | | |
---------------------
| s8 | s9 | sa | |
---------------------
| sc | sd | se | sf |
---------------------
| | s1 | s2 | s3 |
---------------------
| | | s6 | s7 |
---------------------
| | | | sb |
---------------------
*/
for(r =0r {
/*
temp = {Sbox[s0],Sbox[s5],Sbox[sa],Sbox[sf]}
*/
temp[0] = Sbox[*((unsigned char*)State)]
temp[1] = Sbox[*((unsigned char*)(State+1)+1)]
temp[2] = Sbox[*((unsigned char*)(State+2)+2)]
temp[3] = Sbox[*((unsigned char*)(State+3)+3)]
*((unsigned char*)State) = Log_02[temp[0]] ^ Log_03[temp[1]] ^ temp[2] ^ temp[3]
*((unsigned char*)State+1) = Log_02[temp[1]] ^ Log_03[temp[2]] ^ temp[3] ^ temp[0]
*((unsigned char*)State+2) = Log_02[temp[2]] ^ Log_03[temp[3]] ^ temp[0] ^ temp[1]
*((unsigned char*)State+3) = Log_02[temp[3]] ^ Log_03[temp[0]] ^ temp[1] ^ temp[2]
*State ^= word8[r]
State++
}
State -= Nb
}
memcpy(State+Nb,State,12)
word8 += Nb
for(r =0r {
*((unsigned char*)State) = Sbox[*(unsigned char*)State]
*((unsigned char*)State+1) = Sbox[*((unsigned char*)(State+1)+1)]
*((unsigned char*)State+2) = Sbox[*((unsigned char*)(State+2)+2)]
*((unsigned char*)State+3) = Sbox[*((unsigned char*)(State+3)+3)]
*State ^= word8[r]
State++
}
}
/*
解密时进行Nr轮逆运算
AES * aes 运行时参数
*/
void InvCipherLoop(AES *aes)
{
unsigned long *Word = aes->Word,
*State = aes->State
int Nb = aes->Nb,
Nr = aes->Nr
unsigned char temp[4]
int r =0
Word += Nb*Nr
for (r = 0r <Nb++r)
{
State[r] ^= Word[r]
}
State -= 3
for (int round = Nr-1round >0--round)
{
/*
假设Nb=4
---------------------
| | | | |
---------------------
| | | | |
---------------------
| | | | |
---------------------
| s0 | s1 | s2 | s3 |
---------------------
| s4 | s5 | s6 | s7 |
---------------------
| s8 | s9 | sa | sb |
---------------------
| sc | sd | se | sf |
---------------------
*/
memcpy(State,State+Nb,12)
/*
Nb=4
---------------------
| | | | s7 |
---------------------
| | | sa | sb |
---------------------
| | sd | se | sf |
---------------------
| s0 | s1 | s2 | s3 |
---------------------
| s4 | s5 | s6 | |
---------------------
| s8 | s9 | | |
---------------------
| sc | | | |
---------------------
*/
Word -= Nb
State += Nb+2
for(r = Nb-1r >= 0r--)
{
/*
temp = {iSbox[s0],iSbox[sd],iSbox[sa],iSbox[s7]}
*/
temp[0] = iSbox[*(byte*)State]
temp[1] = iSbox[*((byte*)(State-1)+1)]
temp[2] = iSbox[*((byte*)(State-2)+2)]
temp[3] = iSbox[*((byte*)(State-3)+3)]
*(unsigned long*)temp ^= Word[r]
*(unsigned char*)State = Log_0e[temp[0]] ^ Log_0b[temp[1]] ^ Log_0d[temp[2]] ^ Log_09[temp[3]]
*((unsigned char*)State+1) = Log_0e[temp[1]] ^ Log_0b[temp[2]] ^ Log_0d[temp[3]] ^ Log_09[temp[0]]
*((unsigned char*)State+2) = Log_0e[temp[2]] ^ Log_0b[temp[3]] ^ Log_0d[temp[0]] ^ Log_09[temp[1]]
*((unsigned char*)State+3) = Log_0e[temp[3]] ^ Log_0b[temp[0]] ^ Log_0d[temp[1]] ^ Log_09[temp[2]]
State --
}
State -= 2
}
Word -= Nb
memcpy(State,State+Nb,12)
State += Nb+2
for(r = Nb-1r >= 0r--)
{
*(unsigned char*)State = iSbox[*(unsigned char*)State]
*((unsigned char*)State+1) = iSbox[*((unsigned char*)(State-1)+1)]
*((unsigned char*)State+2) = iSbox[*((unsigned char*)(State-2)+2)]
*((unsigned char*)State+3) = iSbox[*((unsigned char*)(State-3)+3)]
*State ^= Word[r]
State --
}
}
/*
*--------------------------------------------
*|k0|k1|k2|k3|k4|k5|k6|k7|k8|k9|.......|Nk*4|
*--------------------------------------------
*Nr轮密钥库
*每个密钥列长度为Nb
*---------------------
*| k0 | k1 | k2 | k3 |
*---------------------
*| k4 | k5 | k6 | k7 |
*---------------------
*| k8 | k9 | ka | kb |
*---------------------
*| kc | kd | ke | kf |
*---------------------
*/
unsigned long* keyExpansion(byte* key, int Nb, int Nr, int Nk)
{
unsigned long *w =new unsigned long[Nb * (Nr+1)]// 4 columns of bytes corresponds to a word
memcpy(w,key,Nk<<2)
unsigned long temp
for (int c = Nkc <Nb * (Nr+1)++c)
{
//把上一轮的最后一行放入temp
temp = w[c-1]
//判断是不是每一轮密钥的第一行
if (c % Nk == 0)
{
//左旋8位
temp = (temp<<8)|(temp>>24)
//查Sbox表
SubWord((byte*)&temp)
temp ^= Rcon[c/Nk]
}
else if ( Nk >6 &&(c % Nk == 4) )
{
SubWord((byte*)&temp)
}
//w[c-Nk] 为上一轮密钥的第一行
w[c] = w[c-Nk] ^ temp
}
return w
}
unsigned char* SubWord(unsigned char* word)
{
word[0] = Sbox[ word[0] ]
word[1] = Sbox[ word[1] ]
word[2] = Sbox[ word[2] ]
word[3] = Sbox[ word[3] ]
return word
}
/*
释放AES结构和State和密钥库word
*/
void freeAES(AES *aes)
{
// for(int i=0iNbi++)
// {
// printf("%d\n",i)
// free(aes->State[i])
// free(aes->Word[i])
// }
// printf("sdffd")
}
