AES方法.docx

1、AES方法AES加密源代码之C版（二） 2007-11-14 23:08:19| 分类： 学习心得 | 标签： |字号大中小 订阅/AES.h#define decrypt TRUE#define encrypt FALSE#define TYPE BOOLtypedef struct _AESint 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keybyte *keySize 密钥长*

2、/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keyint *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 in

3、Size 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 *

4、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.hunsigned char* SubWord(unsigned char* word);unsigned long* keyExpansion(unsigned char* key, int Nk, int Nr,int);/*加密数据byte *input 明

5、文byte *inSize 明文长byte *out 密文存放的地方byte *key 密钥keybyte *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b

6、yte *input 密文int *inSize 密文长byte *out 明文存放的地方byte *key 密钥keyint *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,

7、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 Nb = Nb;aes-Nk = Nk;aes-Nr = Nr;aes-Word = keyExpansion(key,Nb,Nr,Nk);aes-State = new unsigned longNb+3;if(type)aes-Sta

8、te += 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 temp4;unsigned long *word8 = aes-Word,*State = aes-State;i

9、nt Nb = aes-Nb,Nr = aes-Nr;int r;for (r = 0; r Word,*State = aes-State;int Nb = aes-Nb,Nr = aes-Nr;unsigned char temp4;int r =0;Word += Nb*Nr;for (r = 0; r 0; -round)/*假设Nb=4;-| | | | |-| | | | |-| | | | |-| s0 | s1 | s2 | s3 |-| s4 | s5 | s6 | s7 |-| s8 | s9 | sa | sb |-| sc | sd | se | sf |-*/memc

10、py(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-1; r = 0; r-)/*temp = iSboxs0,iSboxsd,iSboxsa,iSboxs7;*/temp0 = iSbox*(byte*)State;temp1 = iSbox*(byte*)(State-1)+

11、1);temp2 = iSbox*(byte*)(State-2)+2);temp3 = iSbox*(byte*)(State-3)+3);*(unsigned long*)temp = Wordr;*(unsigned char*)State = Log_0etemp0 Log_0btemp1 Log_0dtemp2 Log_09temp3;*(unsigned char*)State+1) = Log_0etemp1 Log_0btemp2 Log_0dtemp3 Log_09temp0;*(unsigned char*)State+2) = Log_0etemp2 Log_0btemp

12、3 Log_0dtemp0 Log_09temp1;*(unsigned char*)State+3) = Log_0etemp3 Log_0btemp0 Log_0dtemp1 Log_09temp2;State -;State -= 2;Word -= Nb;memcpy(State,State+Nb,12);State += Nb+2;for(r = Nb-1; r = 0; r-)*(unsigned char*)State = iSbox*(unsigned char*)State;*(unsigned char*)State+1) = iSbox*(unsigned char*)(

13、State-1)+1);*(unsigned char*)State+2) = iSbox*(unsigned char*)(State-2)+2);*(unsigned char*)State+3) = iSbox*(unsigned char*)(State-3)+3);*State = Wordr;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 |*-*|

14、kc | kd | ke | kf |*-*/unsigned long* keyExpansion(byte* key, int Nb, int Nr, int Nk)unsigned long *w =new unsigned longNb * (Nr+1); / 4 columns of bytes corresponds to a wordmemcpy(w,key,Nk2);unsigned long temp;for (int c = Nk; c Nb * (Nr+1); +c)/把上一轮的最后一行放入temptemp = wc-1;/判断是不是每一轮密钥的第一行if (c % Nk

15、 = 0)/左旋8位temp = (temp24);/查Sbox表SubWord(byte*)&temp);temp = Rconc/Nk;else if ( Nk 6 & (c % Nk = 4) )SubWord(byte*)&temp);/wc-Nk 为上一轮密钥的第一行wc = wc-Nk temp;return w;unsigned char* SubWord(unsigned char* word)word0 = Sbox word0 ;word1 = Sbox word1 ;word2 = Sbox word2 ;word3 = Sbox word3 ;return word;/*释放AES结构和State和密钥库word*/void freeAES(AES *aes)/ for(int i=0;iNb;i+)/ / printf(%d ,i);/ free(aes-Statei);/ free(aes-Wordi);/ / printf(sdffd);