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RIJNDAEL.cpp
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RIJNDAEL.cpp
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#include "rijndael.h"
#include <stdlib.h>
/* 2. Standard interface for AES cryptographic routines */
/* These are all based on 32 bit unsigned values and may require */
/* endian conversion for big-endian architectures */
#define LITTLE_ENDIAN
/* 3. Basic macros for speeding up generic operations */
/* Circular rotate of 32 bit values */
#ifdef _MSC_VER
#pragma intrinsic (_lrotr, _lrotl)
#define rotr(x,n) _lrotr(x,n)
#define rotl(x,n) _lrotl(x,n)
#else
#define rotr(x,n) (((x) >> ((int)(n))) | ((x) << (32 - (int)(n))))
#define rotl(x,n) (((x) << ((int)(n))) | ((x) >> (32 - (int)(n))))
#endif
/* Invert byte order in a 32 bit variable */
#define bswap(x) (rotl(x, 8) & 0x00ff00ff | rotr(x, 8) & 0xff00ff00)
/* Extract byte from a 32 bit quantity (little endian notation) */
#define byte(x,n) ((u1byte)((x) >> (8 * n)))
/* Input or output a 32 bit word in machine order */
#ifdef LITTLE_ENDIAN
#define u4byte_in(x) (*(u4byte*)(x))
#define u4byte_out(x, v) (*(u4byte*)(x) = (v))
#else
#define u4byte_in(x) bswap(*(u4byte)(x))
#define u4byte_out(x, v) (*(u4byte*)(x) = bswap(v))
#endif
#define LARGE_TABLES
namespace
{
u1byte pow_tab[256];
u1byte log_tab[256];
u1byte sbx_tab[256];
u1byte isb_tab[256];
u4byte rco_tab[ 10];
u4byte ft_tab[4][256];
u4byte it_tab[4][256];
#ifdef LARGE_TABLES
u4byte fl_tab[4][256];
u4byte il_tab[4][256];
#endif
u4byte tab_gen = 0;
#define ff_mult(a,b) (a && b ? pow_tab[(log_tab[a] + log_tab[b]) % 255] : 0)
#define f_rn(bo, bi, n, k) \
bo[n] = ft_tab[0][byte(bi[n],0)] ^ \
ft_tab[1][byte(bi[(n + 1) & 3],1)] ^ \
ft_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
ft_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n)
#define i_rn(bo, bi, n, k) \
bo[n] = it_tab[0][byte(bi[n],0)] ^ \
it_tab[1][byte(bi[(n + 3) & 3],1)] ^ \
it_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
it_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n)
#ifdef LARGE_TABLES
#define ls_box(x) \
( fl_tab[0][byte(x, 0)] ^ \
fl_tab[1][byte(x, 1)] ^ \
fl_tab[2][byte(x, 2)] ^ \
fl_tab[3][byte(x, 3)] )
#define f_rl(bo, bi, n, k) \
bo[n] = fl_tab[0][byte(bi[n],0)] ^ \
fl_tab[1][byte(bi[(n + 1) & 3],1)] ^ \
fl_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
fl_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n)
#define i_rl(bo, bi, n, k) \
bo[n] = il_tab[0][byte(bi[n],0)] ^ \
il_tab[1][byte(bi[(n + 3) & 3],1)] ^ \
il_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
il_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n)
#else
#define ls_box(x) \
((u4byte)sbx_tab[byte(x, 0)] << 0) ^ \
((u4byte)sbx_tab[byte(x, 1)] << 8) ^ \
((u4byte)sbx_tab[byte(x, 2)] << 16) ^ \
((u4byte)sbx_tab[byte(x, 3)] << 24)
#define f_rl(bo, bi, n, k) \
bo[n] = (u4byte)sbx_tab[byte(bi[n],0)] ^ \
rotl(((u4byte)sbx_tab[byte(bi[(n + 1) & 3],1)]), 8) ^ \
rotl(((u4byte)sbx_tab[byte(bi[(n + 2) & 3],2)]), 16) ^ \
rotl(((u4byte)sbx_tab[byte(bi[(n + 3) & 3],3)]), 24) ^ *(k + n)
#define i_rl(bo, bi, n, k) \
bo[n] = (u4byte)isb_tab[byte(bi[n],0)] ^ \
rotl(((u4byte)isb_tab[byte(bi[(n + 3) & 3],1)]), 8) ^ \
rotl(((u4byte)isb_tab[byte(bi[(n + 2) & 3],2)]), 16) ^ \
rotl(((u4byte)isb_tab[byte(bi[(n + 1) & 3],3)]), 24) ^ *(k + n)
#endif
void gen_tabs(void)
{ u4byte i, t;
u1byte p, q;
// log and power tables for GF(2**8) finite field with
// 0x011b as modular polynomial - the simplest prmitive
// root is 0x03, used here to generate the tables
for(i = 0,p = 1; i < 256; ++i)
{
pow_tab[i] = (u1byte)p; log_tab[p] = (u1byte)i;
p = p ^ (p << 1) ^ (p & 0x80 ? 0x01b : 0);
}
log_tab[1] = 0; p = 1;
for(i = 0; i < 10; ++i)
{
rco_tab[i] = p;
p = (p << 1) ^ (p & 0x80 ? 0x1b : 0);
}
for(i = 0; i < 256; ++i)
{
p = (i ? pow_tab[255 - log_tab[i]] : 0); q = p;
q = (q >> 7) | (q << 1); p ^= q;
q = (q >> 7) | (q << 1); p ^= q;
q = (q >> 7) | (q << 1); p ^= q;
q = (q >> 7) | (q << 1); p ^= q ^ 0x63;
sbx_tab[i] = p; isb_tab[p] = (u1byte)i;
}
for(i = 0; i < 256; ++i)
{
p = sbx_tab[i];
#ifdef LARGE_TABLES
t = p; fl_tab[0][i] = t;
fl_tab[1][i] = rotl(t, 8);
fl_tab[2][i] = rotl(t, 16);
fl_tab[3][i] = rotl(t, 24);
#endif
t = ((u4byte)ff_mult(2, p)) |
((u4byte)p << 8) |
((u4byte)p << 16) |
((u4byte)ff_mult(3, p) << 24);
ft_tab[0][i] = t;
ft_tab[1][i] = rotl(t, 8);
ft_tab[2][i] = rotl(t, 16);
ft_tab[3][i] = rotl(t, 24);
p = isb_tab[i];
#ifdef LARGE_TABLES
t = p; il_tab[0][i] = t;
il_tab[1][i] = rotl(t, 8);
il_tab[2][i] = rotl(t, 16);
il_tab[3][i] = rotl(t, 24);
#endif
t = ((u4byte)ff_mult(14, p)) |
((u4byte)ff_mult( 9, p) << 8) |
((u4byte)ff_mult(13, p) << 16) |
((u4byte)ff_mult(11, p) << 24);
it_tab[0][i] = t;
it_tab[1][i] = rotl(t, 8);
it_tab[2][i] = rotl(t, 16);
it_tab[3][i] = rotl(t, 24);
}
tab_gen = 1;
}
#define star_x(x) (((x) & 0x7f7f7f7f) << 1) ^ ((((x) & 0x80808080) >> 7) * 0x1b)
#define imix_col(y,x) \
u = star_x(x); \
v = star_x(u); \
w = star_x(v); \
t = w ^ (x); \
(y) = u ^ v ^ w; \
(y) ^= rotr(u ^ t, 8) ^ \
rotr(v ^ t, 16) ^ \
rotr(t,24)
} // end of anonymous namespace
#define loop4(i) \
{ t = ls_box(rotr(t, 8)) ^ rco_tab[i]; \
t ^= e_key[4 * i]; e_key[4 * i + 4] = t; \
t ^= e_key[4 * i + 1]; e_key[4 * i + 5] = t; \
t ^= e_key[4 * i + 2]; e_key[4 * i + 6] = t; \
t ^= e_key[4 * i + 3]; e_key[4 * i + 7] = t; \
}
#define loop6(i) \
{ t = ls_box(rotr(t, 8)) ^ rco_tab[i]; \
t ^= e_key[6 * i]; e_key[6 * i + 6] = t; \
t ^= e_key[6 * i + 1]; e_key[6 * i + 7] = t; \
t ^= e_key[6 * i + 2]; e_key[6 * i + 8] = t; \
t ^= e_key[6 * i + 3]; e_key[6 * i + 9] = t; \
t ^= e_key[6 * i + 4]; e_key[6 * i + 10] = t; \
t ^= e_key[6 * i + 5]; e_key[6 * i + 11] = t; \
}
#define loop8(i) \
{ t = ls_box(rotr(t, 8)) ^ rco_tab[i]; \
t ^= e_key[8 * i]; e_key[8 * i + 8] = t; \
t ^= e_key[8 * i + 1]; e_key[8 * i + 9] = t; \
t ^= e_key[8 * i + 2]; e_key[8 * i + 10] = t; \
t ^= e_key[8 * i + 3]; e_key[8 * i + 11] = t; \
t = e_key[8 * i + 4] ^ ls_box(t); \
e_key[8 * i + 12] = t; \
t ^= e_key[8 * i + 5]; e_key[8 * i + 13] = t; \
t ^= e_key[8 * i + 6]; e_key[8 * i + 14] = t; \
t ^= e_key[8 * i + 7]; e_key[8 * i + 15] = t; \
}
#define f_nround(bo, bi, k) \
f_rn(bo, bi, 0, k); \
f_rn(bo, bi, 1, k); \
f_rn(bo, bi, 2, k); \
f_rn(bo, bi, 3, k); \
k += 4
#define f_lround(bo, bi, k) \
f_rl(bo, bi, 0, k); \
f_rl(bo, bi, 1, k); \
f_rl(bo, bi, 2, k); \
f_rl(bo, bi, 3, k)
#define i_nround(bo, bi, k) \
i_rn(bo, bi, 0, k); \
i_rn(bo, bi, 1, k); \
i_rn(bo, bi, 2, k); \
i_rn(bo, bi, 3, k); \
k -= 4
#define i_lround(bo, bi, k) \
i_rl(bo, bi, 0, k); \
i_rl(bo, bi, 1, k); \
i_rl(bo, bi, 2, k); \
i_rl(bo, bi, 3, k)
void rijndael::set_key(const u1byte in_key[], const u4byte key_len)
{
u4byte i, t, u, v, w;
if(!tab_gen)
gen_tabs();
k_len = (key_len + 31) / 32;
e_key[0] = u4byte_in(in_key );
e_key[1] = u4byte_in(in_key + 4);
e_key[2] = u4byte_in(in_key + 8);
e_key[3] = u4byte_in(in_key + 12);
switch(k_len)
{
case 4: t = e_key[3];
for(i = 0; i < 10; ++i)
loop4(i);
break;
case 6: e_key[4] = u4byte_in(in_key + 16); t = e_key[5] = u4byte_in(in_key + 20);
for(i = 0; i < 8; ++i)
loop6(i);
break;
case 8: e_key[4] = u4byte_in(in_key + 16); e_key[5] = u4byte_in(in_key + 20);
e_key[6] = u4byte_in(in_key + 24); t = e_key[7] = u4byte_in(in_key + 28);
for(i = 0; i < 7; ++i)
loop8(i);
break;
}
d_key[0] = e_key[0]; d_key[1] = e_key[1];
d_key[2] = e_key[2]; d_key[3] = e_key[3];
for(i = 4; i < 4 * k_len + 24; ++i)
{
imix_col(d_key[i], e_key[i]);
}
return;
}
// encrypt a block of text
void rijndael::encrypt(u1byte in_blk[16],u1byte out_blk[16])
{
u4byte b0[4], b1[4], *kp;
b0[0] = u4byte_in(in_blk ) ^ e_key[0]; b0[1] = u4byte_in(in_blk + 4) ^ e_key[1];
b0[2] = u4byte_in(in_blk + 8) ^ e_key[2]; b0[3] = u4byte_in(in_blk + 12) ^ e_key[3];
kp = e_key + 4;
if(k_len > 6)
{
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
}
if(k_len > 4)
{
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
}
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
f_nround(b1, b0, kp); f_lround(b0, b1, kp);
u4byte_out(out_blk, b0[0]); u4byte_out(out_blk + 4, b0[1]);
u4byte_out(out_blk + 8, b0[2]); u4byte_out(out_blk + 12, b0[3]);
}
void rijndael::decrypt(u1byte in_blk[16],u1byte out_blk[16])
{
u4byte b0[4], b1[4], *kp;
b0[0] = u4byte_in(in_blk ) ^ e_key[4 * k_len + 24];
b0[1] = u4byte_in(in_blk + 4) ^ e_key[4 * k_len + 25];
b0[2] = u4byte_in(in_blk + 8) ^ e_key[4 * k_len + 26];
b0[3] = u4byte_in(in_blk + 12) ^ e_key[4 * k_len + 27];
kp = d_key + 4 * (k_len + 5);
if(k_len > 6)
{
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
}
if(k_len > 4)
{
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
}
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
i_nround(b1, b0, kp); i_lround(b0, b1, kp);
u4byte_out(out_blk, b0[0]); u4byte_out(out_blk + 4, b0[1]);
u4byte_out(out_blk + 8, b0[2]); u4byte_out(out_blk + 12, b0[3]);
}