AES.rar_基于Aes的毕设_数据加密

#include "AES.H" #include <stdio.h> int BC,KC,ROUNDS; word32 Rc[30]={0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1B,0x36,0x6C,0xD8,0xAB,0x4D,0x9A,0x2F, 0x5E,0xBC,0x63,0xC6,0x97,0x35,0x6A,0xD4,0xB3,0x7D,0xFA,0xEF,0xC5}; word8 mul(word8 a,word8 b) { if (a && b) return Alogtable[(Logtable[a]+Logtable[b])%255]; else return 0; } void AddRoundKey (word8 a[4][MAXBC],word8 rk[4][MAXBC]) { 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]) { int i,j; for(i=0;i<4;i++) { for(j=0;j<BC;j++) { a[i][j]=box[a[i][j]]; } } } void ShiftRows(word8 a[4][MAXBC],word8 d) { word8 tmp[MAXBC]; int i,j; if (d==0) { for(i=1;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=1;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]; } } } void MixColumns(word8 a[4][MAXBC]) { word8 b[4][MAXBC]; int i,j; for (j=0;j<BC;j++) { for(i=0;i<4;i++) { b[i][j]=mul(2,a[i][j])^mul(3,a[(i+1)%4][j])^a[(i+2)%4][j]^a[(i+3)%4][j]; } } for(i=0;i<4;i++) { for(j=0;j<BC;j++) { a[i][j]=b[i][j]; } } } void InvMixCoIumns(word8 a[4][MAXBC]) { word8 b[4][MAXBC]; int i,j; for(j=0;j<BC;j++) { for(i=0;i<4;i++) { b[i][j]=mul(0xe,a[i][j])^mul(0xb,a[(i+1)%4][j])^mul(0xd,a[(i+2)%4][j])^mul(0x9,a[(i+3)%4][j]); } } for(i=0;i<4;i++) { for(j=0;j<BC;j++) { a[i][j]=b[i][j]; } } } int KeyExpansion(word8 k[4][MAXKC],word8 W[MAXROUNDS+1][4][MAXBC]) { int i,j,t,RCpointer=1; word8 tk[4][MAXKC]; for(j=0;j<KC;j++) { for(i=0;i<4;i++) { tk[i][j]=k[i][j]; } } t=0; for(j=0;(j<KC)&&(t<(ROUNDS+1)*BC);j++,t++) { for(i=0;i<4;i++) { W[t/BC][i][t%BC]=tk[i][j]; } } while (t<(ROUNDS+1)*BC) { for(i=0;i<4;i++) { tk[i][0]^=S[tk[(i+1)%4][KC-1]]; } tk[0][0]^=Rc[RCpointer++]; if(KC<=6) for(j=1;j<KC;j++) { for(i=0;i<4;i++) { tk[i][j]^=tk[i][j-1]; } } else { for(j=1;j<4;j++) { for(i=0;i<4;i++) { tk[i][j]^=tk[i][j-1]; } } for(i=0;i<4;i++) tk[i][4]^=S[tk[i][3]]; for(j=5;j<KC;j++) { for(i=0;i<4;i++) { tk[i][j]^=tk[i][j-1]; } } } for(j=0;(j<KC)&&(t<(ROUNDS+1)*BC);j++,t++) { for(i=0;i<4;i++) { W[t/BC][i][t%BC]=tk[i][j]; } } } return 0; } int Encrypt(word8 a[4][MAXBC],word8 rk[MAXROUNDS+1][4][MAXBC]) { int r; AddRoundKey(a,rk[0]); for(r=1;r<ROUNDS;r++) { SubBytes(a,S); ShiftRows(a,0); MixColumns(a); AddRoundKey(a,rk[r]); } SubBytes(a,S); ShiftRows(a,0); AddRoundKey(a,rk[ROUNDS]); return 0; } int Decrypt(word8 a[4][MAXBC],word8 rk[MAXROUNDS+1][4][MAXBC]) { int r; AddRoundKey(a,rk[ROUNDS]); SubBytes(a,Si); ShiftRows(a,1); for(r=ROUNDS-1;r>0;r--) { AddRoundKey(a,rk[r]); InvMixCoIumns(a); SubBytes(a,Si); ShiftRows(a,1); } AddRoundKey(a,rk[0]); return 0; } int TestEncrypt(word8 a[4][MAXBC],word8 rk[MAXROUNDS+1][4][MAXBC]) { int r; int i, j; AddRoundKey(a,rk[0]); printf(" ARK-0: "); for(j=0;j<BC;j++) { for(i=0;i<4;i++) { printf("%02X",a[i][j]); } } printf("\n"); for(r=1;r<ROUNDS;r++) { SubBytes(a,S); printf(" SB-%d: ",r); for(j=0;j<BC;j++) { for(i=0;i<4;i++) { printf("%02X",a[i][j]); } } printf("\n"); ShiftRows(a,0); printf(" SR-%d: ",r); for(j=0;j<BC;j++) { for(i=0;i<4;i++) { printf("%02X",a[i][j]); } } printf("\n"); MixColumns(a); printf(" MC-%d: ",r); for(j=0;j<BC;j++) { for(i=0;i<4;i++) { printf("%02X",a[i][j]); } } printf("\n"); AddRoundKey(a,rk[r]); printf(" ARK-%d: ",r); for(j=0;j<BC;j++) { for(i=0;i<4;i++) { printf("%02X",a[i][j]); } } printf("\n"); } SubBytes(a,S); printf(" SB-10: "); for(j=0;j<4;j++) { for(i=0;i<4;i++) { printf("%02X",a[i][j]); } } printf("\n"); ShiftRows(a,0); printf(" SR-10: "); for(j=0;j<BC;j++) { for(i=0;i<4;i++) { printf("%02X",a[i][j]); } } printf("\n"); AddRoundKey(a,rk[ROUNDS]); printf(" ARK-10: "); for(j=0;j<BC;j++) { for(i=0;i<4;i++) { printf("%02X",a[i][j]); } } printf("\n"); return 0; }