[C++]AES128
AES.h
#ifndef __AES_H__ #define __AES_H__ #define AES_128 //#define AES_192 //#define AES_256 #ifdef AES_128 #define BLOCK_LEN 16 //分组长度（字节） #define KEY_LEN 16 //秘钥长度（字节） #define ENCRYPT_NUM 10 //加密轮数 #elif AES_192 #define BLOCK_LEN 16 //分组长度（字节） #define KEY_LEN 24 //秘钥长度（字节） #define ENCRYPT_NUM 12 //加密轮数 #else #define BLOCK_LEN 16 //分组长度（字节） #define KEY_LEN 32 //秘钥长度（字节） #define ENCRYPT_NUM 14 //加密轮数 #endif void AES(u8 *plaintext, u8 *key, u8 *ciphertext); void DeAES(u8 *ciphertext, u8 *key, u8 *plaintext); #endif
type.h
#ifndef __TYPE_H__ #define __TYPE_H__ #include <stdio.h> typedef unsigned char u8; typedef unsigned short u16; typedef unsigned int u32; typedef unsigned long long u64; typedef unsigned char BOOL; #define FALSE 0 #define TRUE 1 #endif
AES.c
#include <stdio.h> #include "type.h" #include "AES.h" /*AES加密算法是对称算法，明文和秘钥长度固定，根据不同AES算法长度不同 * AES 秘钥长度(32位比特字) 分组长度(32位比特字) 加密轮数 * AES-128 4 4 10 * AES-192 6 4 12 * AES-256 8 4 14 * *本代码仅实现AES-128 */ u32 W[44];//存放扩展秘钥 /**S盒***/ static const u8 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 }; /**逆S盒***/ static const u8 S_INVERSE[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 }; /**列混淆左乘的矩阵*/ static const u8 GF[4][4] = { 0x02, 0x03, 0x01, 0x01, 0x01, 0x02, 0x03, 0x01, 0x01, 0x01, 0x02, 0x03, 0x03, 0x01, 0x01, 0x02}; /**逆向列混淆左乘的矩阵*/ static const u8 GF_INVERSE[4][4] = { 0x0E, 0x0B, 0x0D, 0x09, 0x09, 0x0E, 0x0B, 0x0D, 0x0D, 0x09, 0x0E, 0x0B, 0x0B, 0x0D, 0x09, 0x0E}; /*扩展秘钥用的常量*/ static const u8 RC[11]={0x00,0x01,0x02,0x04,0x08,0x10, 0x20,0x40,0x80,0x1B,0x36}; /************************************************* *function name:AddRoundKey *function:轮秘钥加 *input: plaintext-明文 * W-扩展秘钥 * value-明文和秘钥异或后的值 *output:void **************************************************/ static void AddRoundKey(u8 *plaintext, u32 *W, u8 *value) { u8 i; for(i=0;i<KEY_LEN;i++) value[i] = plaintext[i]^((W[i/4]>>((3-i%4)<<3))&0x000000ff); } /************************************************* *function name:SubstituteBytes *function:字节替换 *input: value-轮秘钥加后的值，字节替换后为新值 *output:void **************************************************/ static void SubstituteBytes(u8 *value) { u8 i; for(i=0;i<KEY_LEN;i++) value[i] = S[(value[i]>>4)&0x0f][value[i]&0x0f]; } /************************************************* *function name:InverseSubstituteBytes *function:逆向字节替换 *input: value-需字节替换的值 *output:void **************************************************/ static void InverseSubstituteBytes(u8 *value) { u8 i; for(i=0;i<KEY_LEN;i++) value[i] = S_INVERSE[(value[i]>>4)&0x0f][value[i]&0x0f]; } /************************************************* *function name:ShiftRows *function:行位移 *input: value-字节替换后的值，行位移后为新值 *output:void **************************************************/ static void ShiftRows(u8 *value) { u8 i,j; u8 temp[BLOCK_LEN]; for(i=0;i<BLOCK_LEN;i++)//存放在临时变量 temp[i] = value[i]; value[1]=temp[5]; value[5]=temp[9]; value[9]=temp[13];value[13]=temp[1]; value[2]=temp[10];value[6]=temp[14];value[10]=temp[2];value[14]=temp[6]; value[3]=temp[15];value[7]=temp[3]; value[11]=temp[7];value[15]=temp[11]; } /************************************************* *function name:InverseShiftRows *function:逆向行位移 *input: value-需逆向行位移的值 *output:void **************************************************/ static void InverseShiftRows(u8 *value) { u8 i; u8 temp[BLOCK_LEN]; for(i=0;i<BLOCK_LEN;i++)//存放在临时变量 temp[i] = value[i]; value[1]=temp[13]; value[5]=temp[1]; value[9]=temp[5];value[13]=temp[9]; value[2]=temp[10];value[6]=temp[14];value[10]=temp[2];value[14]=temp[6]; value[3]=temp[7];value[7]=temp[11]; value[11]=temp[15];value[15]=temp[3]; } /* * Multiplication in GF(2^8) * http://en.wikipedia.org/wiki/Finite_field_arithmetic * Irreducible polynomial m(x) = x8 + x4 + x3 + x + 1 * input:a-GF矩阵值 * b-与GF矩阵相乘的值 */ u8 gmult(u8 a, u8 b) { u8 p = 0, i = 0, hbs = 0; for (i = 0; i < 8; i++) { if (b & 1) { p ^= a; } hbs = a & 0x80; a <<= 1; if (hbs) a ^= 0x1b; // 0000 0001 0001 1011 b >>= 1; } return (u8)p; } /************************************************* *function name:MixColumns *function:列混淆 *input: value-行位移后的值，列混淆后为新值 *output:void **************************************************/ static void MixColumns(u8 *value) { u8 i,j,k,temp,sum; u8 tempvalue[16]; for(i=0;i<16;i++)//value值存放在临时变量中 tempvalue[i] = value[i]; for(i=0;i<4;i++) { for(j=0;j<4;j++) { sum = 0; for(k=0;k<4;k++) { temp = tempvalue[j*4+k];//取值 if(temp&0x80 && GF[i][k]>1)//原始数据最高位为1且有移位发生 { temp = (temp<<(GF[i][k]/2))^((GF[i][k]==3)?temp:0x00); temp ^= 0x1B;//异或0001 1011 } else temp = (temp<<GF[i][k]/2)^((GF[i][k]==3)?temp:0x00); sum ^=temp; } value[i+j*4]=sum; } } }/************************************************* *function name:InverseMixColumns *function:逆向列混淆 *input: value-需列混淆的值 *output:void **************************************************/ static void InverseMixColumns(u8 *value) { u8 i,j,k,l,temp,sum; u8 tempvalue[16]; for(i=0;i<16;i++)//value值存放在临时变量中 tempvalue[i] = value[i]; for(i=0;i<4;i++)//行 { for(j=0;j<4;j++)//列 { //sum = 0; temp = 0; for(k=0;k<4;k++) { ////temp = tempvalue[j*4+k];//取值 ////temp = 0; //for(l=0;l<8;l++)//循环8位 //{ // if(GF_INVERSE[i][k]&(0x01<<l)) // { // temp ^= tempvalue[j*4+k]<<l; // if((tempvalue[j*4+k])&(0x01<<(8-l)))//最高位为1 // temp ^= 0x1B; // } //} //sum ^=temp; temp ^= gmult(GF_INVERSE[i][k],tempvalue[j*4+k]); } //value[i+j*4]=sum; value[i+j*4]=temp; } } } /************************************************* *function name:g *function:扩展秘钥用到的函数 *input: key j *return:32比特字 **************************************************/ static u32 g(u32 W,u8 j) { u8 temp[4]; u32 value=0; u8 i; for(i=0;i<4;i++)//将字转换成字节 { temp[i] = (u8)(W>>(8*(3-i))&0xff); temp[i] = S[(temp[i]>>4)&0x0f][temp[i]&0x0f]; } temp[1] ^= RC[j/4]; value = (u32)(temp[1]<<24)|(u32)(temp[2]<<16)|(u32)(temp[3]<<8)|(u32)temp[0]; return value; } /************************************************* *function name:ExtendKey *function:扩展秘钥 *input: key-秘钥 *output:void **************************************************/ static void ExtendKey(u8 *key) { u8 i,j; for(i=0;i<4;i++) { W[i]=0;//清零 for(j=0;j<4;j++) W[i] |= ((key[i*4+j]&0xff)<<((3-j)*8)); } for(j=4;j<44;j++) { if(j%4) W[j]=W[j-4]^W[j-1]; else W[j]=W[j-4]^g(W[j-1],j); } } /************************************************* *function name:AES *function:AES加密,一次加密16字节 *input: plaintext-明文 * key-秘钥 * ciphertext-密文,也作为中间值 *output:void **************************************************/ void AES(u8 *plaintext, u8 *key, u8 *ciphertext) { u8 i; ExtendKey(key); AddRoundKey(plaintext, W, ciphertext);//轮秘钥加 for(i=1;i<ENCRYPT_NUM;i++) { SubstituteBytes(ciphertext);//字节替换 ShiftRows(ciphertext);//行位移 MixColumns(ciphertext);//列混淆 AddRoundKey(ciphertext, W+i*4, ciphertext);//轮秘钥加 } SubstituteBytes(ciphertext);//字节替换 ShiftRows(ciphertext);//行位移 AddRoundKey(ciphertext, W+40, ciphertext);//轮秘钥加 } /************************************************* *function name:DeAES *function:AES解密 *input: ciphertext-密文 * key-秘钥 * plaintext-明文,也作为中间值 *output:void **************************************************/ void DeAES(u8 *ciphertext, u8 *key, u8 *plaintext) { u8 i; ExtendKey(key); AddRoundKey(ciphertext, W+40, plaintext);//轮秘钥加 for(i=ENCRYPT_NUM-1;i>0;i--) { InverseShiftRows(plaintext); //逆向行位移 InverseSubstituteBytes(plaintext); //逆向字节替换 AddRoundKey(plaintext, W+i*4, plaintext);//轮秘钥加 InverseMixColumns(plaintext); //逆向列混淆 } InverseShiftRows(plaintext); //逆向行位移 InverseSubstituteBytes(plaintext); //逆向字节替换 AddRoundKey(plaintext, W, plaintext);//轮秘钥加 }
mian.cpp
#include <stdio.h> #include "type.h" #include "AES.h" int main() { u8 i; u8 AES_plaintext[16]={0x32,0x43,0xf6,0xa8,0x88,0x5a,0x30,0x8d,0x31,0x31,0x98,0xa2,0xe0,0x37,0x07,0x34};//明文 u8 AES_key[16]={0x2b,0x7e,0x15,0x16,0x28,0xae,0xd2,0xa6,0xab,0xf7,0x15,0x88,0x09,0xcf,0x4f,0x3c}; //秘钥 u8 AES_ciphertext[16]; /**************************** AES **************************************/ printf("***************************** AES 加密********************************\r\n"); AES(AES_plaintext, AES_key, AES_ciphertext); printf("plaintext is :"); for(i=0;i<16;i++) printf("%02x",AES_plaintext[i]); printf("\r\n"); printf("ciphertext is :"); for(i=0;i<16;i++) printf("%02x",AES_ciphertext[i]); printf("\r\n\r\n"); printf("***************************** AES 解密********************************\r\n"); DeAES(AES_ciphertext, AES_key, AES_plaintext); printf("ciphertext is :"); for(i=0;i<16;i++) printf("%02x",AES_ciphertext[i]); printf("\r\n"); printf("plaintext is :"); for(i=0;i<16;i++) printf("%02x",AES_plaintext[i]); printf("\r\n"); system("pause"); return 0; }
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