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AES Encryption.cpp
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AES Encryption.cpp
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#include<bits/stdc++.h>
using namespace std;
string encrypt,decrypt;
unsigned char num[10]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36,};
unsigned char mcolumns[4][4]={
{0x02,0x03,0x01,0x01},{0x01,0x02,0x03,0x01},
{0x01,0x01,0x02,0x03},{0x03,0x01,0x01,0x02},
};
unsigned char mcolumnsinv[4][4]={
{0x0e,0x0b,0x0d,0x09},{0x09,0x0e,0x0b,0x0d},
{0x0d,0x09,0x0e,0x0b},{0x0b,0x0d,0x09,0x0e},
};
unsigned char sbox[256]={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,
};
unsigned char sboxinv[256]={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,
};
unsigned char req[256]={0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
};
void create(unsigned char w[][4],string s){
for(int i=0;i<16;i++)
w[i%4][i/4]=req[int(s[i])];
}
void xorier(unsigned char mat[][4],unsigned char w[][4]){
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
mat[i][j]=mat[i][j]^w[i][j];
}
void substitute(unsigned char mat[][4]){
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
mat[i][j]=sbox[mat[i][j]];
}
void substituteinv(unsigned char mat[][4]){
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
mat[i][j]=sboxinv[mat[i][j]];
}
void shift(unsigned char mat[][4]){
for(int i=0;i<4;i++){
unsigned char temp[4];
int id=0;
for(int j=i;j<4;j++)
temp[id++]=mat[i][j];
for(int j=0;j<i;j++)
temp[id++]=mat[i][j];
for(int j=0;j<4;j++)
mat[i][j]=temp[j];
}
}
void shiftinv(unsigned char mat[][4]){
for(int i=0;i<4;i++){
unsigned char temp[4];
int id=0;
for(int j=4-i;j<4;j++)
temp[id++]=mat[i][j];
for(int j=0;j<4-i;j++)
temp[id++]=mat[i][j];
for(int j=0;j<4;j++)
mat[i][j]=temp[j];
}
}
unsigned char gmul(unsigned char a, unsigned char b) {
unsigned char p = 0;
unsigned char counter;
unsigned char hi_bit_set;
for(counter = 0; counter < 8; counter++) {
if((b & 1) == 1)
p ^= a;
hi_bit_set = (a & 0x80);
a <<= 1;
if(hi_bit_set == 0x80)
a ^= 0x1b;
b >>= 1;
}
return p;
}
void mixcolumn(unsigned char mat[][4]){
unsigned char w[4][4];
for(int i=0;i<4;i++){
for(int j=0;j<4;j++){
unsigned char temp=0x00;
for(int k=0;k<4;k++){
temp=temp^gmul(mcolumns[i][k],mat[k][j]);
}
w[i][j]=temp;
}
}
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
mat[i][j]=w[i][j];
}
void mixcolumninv(unsigned char mat[][4]){
unsigned char w[4][4];
for(int i=0;i<4;i++){
for(int j=0;j<4;j++){
unsigned char temp=0x00;
for(int k=0;k<4;k++){
temp=temp^gmul(mcolumnsinv[i][k],mat[k][j]);
}
w[i][j]=temp;
}
}
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
mat[i][j]=w[i][j];
}
void expand(unsigned char w[][4],unsigned char x){
unsigned char p=w[0][3];
unsigned char temp[4];
for(int i=0;i<3;i++)
temp[i]=w[i+1][3];
temp[3]=p;
for(int i=0;i<4;i++)
temp[i]=sbox[temp[i]];
temp[0]=(temp[0]^x);
for(int i=0;i<4;i++){
for(int j=0;j<4;j++){
w[j][i]=w[j][i]^temp[j];
}
for(int j=0;j<4;j++)
temp[j]=w[j][i];
}
}
void expandinv(unsigned char w[][4],unsigned char x){
for(int i=2;i>=0;i--)
for(int j=0;j<4;j++){
w[j][i+1]=w[j][i]^w[j][i+1];
}
unsigned char p=w[0][3];
unsigned char temp[4];
for(int i=0;i<3;i++)
temp[i]=w[i+1][3];
temp[3]=p;
for(int i=0;i<4;i++)
temp[i]=sbox[temp[i]];
temp[0]=(temp[0]^x);
for(int i=0;i<4;i++)
w[i][0]=w[i][0]^temp[i];
}
void encryptAES(unsigned char w[][4],unsigned char mat[][4]){
xorier(mat,w);
for(int k=0;k<10;k++){
substitute(mat);
shift(mat);
if(k<9)
mixcolumn(mat);
expand(w,num[k]);
xorier(mat,w);
}
vector<int> converter;
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
converter.push_back(mat[j][i]);
for(auto p:converter)
encrypt+=p;
}
void decryptAES(unsigned char w[][4],unsigned char mat[][4]){
for(int k=9;k>=0;k--){
xorier(mat,w);
expandinv(w,num[k]);
if(k<9)
mixcolumninv(mat);
shiftinv(mat);
substituteinv(mat);
}
xorier(mat,w);
vector<int> converter;
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
converter.push_back(mat[j][i]);
for(auto p:converter)
decrypt+=p;
}
int main(){
encrypt=decrypt="";
unsigned char w[4][4],copy[4][4];
string s;
cout<<"ENTER AES SECRET KEY\n";
getline(cin,s);
int len=s.size();
while(len<16)
{
s+=' ';
len++;
}
create(w,s);
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
copy[i][j]=w[i][j];
cout<<"\nENTER PLAINTEXT\n";
getline(cin,s);
len=s.length();
while(len%16){
s+=' ';
len++;
}
int k=0;
while(k<len){
string temp="";
for(int i=0;i<16;i++,k++)
temp+=s[k];
unsigned char mat[4][4];
create(mat,temp);
encryptAES(w,mat);
decryptAES(w,mat);
}
cout<<"\nENCRYPTED STRING IS \n";
cout<<encrypt<<endl;
cout<<"\nDECRYPTED STRING IS\n";
cout<<decrypt<<endl;
return 0;
}