aes.h aes.cpp

//#ifndef AES_H

//#define AES_H

//class AES

//{

//public:

//    AES();

//};

//#endif // AES_H

#ifndef __AES_H__

#define __AES_H__

#define AES_MIN_KEY_SIZE    16

#define AES_MAX_KEY_SIZE    32

#define AES_BLOCK_SIZE        16

typedef unsigned char    u8;

typedef signed char    s8;

typedef signed short    s16;

typedef unsigned short    u16;

typedef    signed int    s32;

typedef unsigned int    u32;

//typedef signed long long    s64;

//typedef unsigned long long    u64;

typedef u16        __le16;

typedef u32        __le32;

#define E_KEY    (&ctx->buf[0])

#define D_KEY    (&ctx->buf[60])

#define le32_to_cpu

#define cpu_to_le32

struct aes_ctx

{

    int key_length;

    u32 buf[120];

};

void gen_tabs (void);

int aes_set_key(struct aes_ctx * ctx, const u8 *in_key, unsigned int key_len);

void aes_encrypt(struct aes_ctx * ctx, u8 *out, const u8 *in);

void aes_decrypt(struct aes_ctx * ctx, u8 *out, const u8 *in);

#endif

//#include "AES.h"

//AES::AES()

//{

//}

#include <stdio.h>

#include "aes.h"

static u8 pow_tab[256];

static u8 log_tab[256];

static u8 sbx_tab[256];

static u8 isb_tab[256];

static u32 rco_tab[10];

static u32 ft_tab[4][256];

static u32 it_tab[4][256];

static u32 fl_tab[4][256];

static u32 il_tab[4][256];

static inline u8 _byte(const u32 x ,const unsigned n)

{

    return x >> (n << 3);

}

static inline u32 rol32(u32 word, unsigned int shift)

{

    return (word << shift) | (word >> (32 - shift));

}

static inline u32 ror32(u32 word, unsigned int shift)

{

    return (word >> shift) | (word << (32 - shift));

}

static inline u8 f_mult(u8 a , u8 b )

{

    u8 aa = log_tab[a];

    u8 cc = aa + log_tab[b];

    return pow_tab[cc + (cc < aa ? 1 : 0 )];

}

#define ff_mult(a,b) (a && b ? f_mult(a,b) : 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)

#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)

void gen_tabs (void)

{

    u32 i, t;

    u8 p, q;

    /* log and power tables for GF(2**8) finite field with

     *        0x011b as modular polynomial - the simplest primitive

     *               root is 0x03, used here to generate the tables */

    for (i = 0, p = 1; i < 256; ++i) {

        pow_tab[i] = (u8) p;

        log_tab[p] = (u8) i;

        p ^= (p << 1) ^ (p & 0x80 ? 0x01b : 0);

    }

    log_tab[1] = 0;

    for (i = 0, p = 1; i < 10; ++i) {

        rco_tab[i] = p;

        p = (p << 1) ^ (p & 0x80 ? 0x01b : 0);

    }

    for (i = 0; i < 256; ++i) {

        p = (i ? pow_tab[255 - log_tab[i]] : 0);

        q = ((p >> 7) | (p << 1)) ^ ((p >> 6) | (p << 2));

        p ^= 0x63 ^ q ^ ((q >> 6) | (q << 2));

        sbx_tab[i] = p;

        isb_tab[p] = (u8) i;

    }

    for (i = 0; i < 256; ++i) {

        p = sbx_tab[i];

        t = p;

        fl_tab[0][i] = t;

        fl_tab[1][i] = rol32(t, 8);

        fl_tab[2][i] = rol32(t, 16);

        fl_tab[3][i] = rol32(t, 24);

        t = ((u32) ff_mult (2, p)) |

            ((u32) p << 8) |

            ((u32) p << 16) | ((u32) ff_mult (3, p) << 24);

        ft_tab[0][i] = t;

        ft_tab[1][i] = rol32(t, 8);

        ft_tab[2][i] = rol32(t, 16);

        ft_tab[3][i] = rol32(t, 24);

        p = isb_tab[i];

        t = p;

        il_tab[0][i] = t;

        il_tab[1][i] = rol32(t, 8);

        il_tab[2][i] = rol32(t, 16);

        il_tab[3][i] = rol32(t, 24);

        t = ((u32) ff_mult (14, p)) |

            ((u32) ff_mult (9, p) << 8) |

            ((u32) ff_mult (13, p) << 16) |

            ((u32) ff_mult (11, p) << 24);

        it_tab[0][i] = t;

        it_tab[1][i] = rol32(t, 8);

        it_tab[2][i] = rol32(t, 16);

        it_tab[3][i] = rol32(t, 24);

    }

}

#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) ^= ror32(u ^ t,  8) ^ ror32(v ^ t, 16) ^ ror32(t,24)

/* initialise the key schedule from the user supplied key */

#define loop4(i)    {   t = ror32(t,  8); t = ls_box(t) ^ 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 = ror32(t,  8); t = ls_box(t) ^ 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 = ror32(t,  8); ; t = ls_box(t) ^ 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;   }

int aes_set_key(struct aes_ctx * ctx, const u8 *in_key, unsigned int key_len)

{

    const __le32 *key = (const __le32 *)in_key;

    u32 i, t, u, v, w;

    if (key_len % 8 || key_len < AES_MIN_KEY_SIZE || key_len > AES_MAX_KEY_SIZE) {

        return -1;

    }

    ctx->key_length = key_len;

    E_KEY[0] = le32_to_cpu(key[0]);

    E_KEY[1] = le32_to_cpu(key[1]);

    E_KEY[2] = le32_to_cpu(key[2]);

    E_KEY[3] = le32_to_cpu(key[3]);

    switch (key_len) {

        case 16:

            t = E_KEY[3];

            for (i = 0; i < 10; ++i)

                loop4 (i);

            break;

        case 24:

            E_KEY[4] = le32_to_cpu(key[4]);

            t = E_KEY[5] = le32_to_cpu(key[5]);

            for (i = 0; i < 8; ++i)

                loop6 (i);

            break;

        case 32:

            E_KEY[4] = le32_to_cpu(key[4]);

            E_KEY[5] = le32_to_cpu(key[5]);

            E_KEY[6] = le32_to_cpu(key[6]);

            t = E_KEY[7] = le32_to_cpu(key[7]);

            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 < key_len + 24; ++i) {

        imix_col (D_KEY[i], E_KEY[i]);

    }

    return 0;

}

/* encrypt a block of text */

#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)

void aes_encrypt(struct aes_ctx * ctx, u8 *out, const u8 *in)

{

    const __le32 *src = (const __le32 *)in;

    __le32 *dst = (__le32 *)out;

    u32 b0[4], b1[4];

    const u32 *kp = E_KEY + 4;

    b0[0] = le32_to_cpu(src[0]) ^ E_KEY[0];

    b0[1] = le32_to_cpu(src[1]) ^ E_KEY[1];

    b0[2] = le32_to_cpu(src[2]) ^ E_KEY[2];

    b0[3] = le32_to_cpu(src[3]) ^ E_KEY[3];

    if (ctx->key_length > 24) {

        f_nround (b1, b0, kp);

        f_nround (b0, b1, kp);

    }

    if (ctx->key_length > 16) {

        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);

    dst[0] = cpu_to_le32(b0[0]);

    dst[1] = cpu_to_le32(b0[1]);

    dst[2] = cpu_to_le32(b0[2]);

    dst[3] = cpu_to_le32(b0[3]);

}

/* decrypt a block of text */

#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 aes_decrypt(struct aes_ctx * ctx, u8 *out, const u8 *in)

{

    const __le32 *src = (const __le32 *)in;

    __le32 *dst = (__le32 *)out;

    u32 b0[4], b1[4];

    const int key_len = ctx->key_length;

    const u32 *kp = D_KEY + key_len + 20;

    b0[0] = le32_to_cpu(src[0]) ^ E_KEY[key_len + 24];

    b0[1] = le32_to_cpu(src[1]) ^ E_KEY[key_len + 25];

    b0[2] = le32_to_cpu(src[2]) ^ E_KEY[key_len + 26];

    b0[3] = le32_to_cpu(src[3]) ^ E_KEY[key_len + 27];

    if (key_len > 24) {

        i_nround (b1, b0, kp);

        i_nround (b0, b1, kp);

    }

    if (key_len > 16) {

        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);

    dst[0] = cpu_to_le32(b0[0]);

    dst[1] = cpu_to_le32(b0[1]);

    dst[2] = cpu_to_le32(b0[2]);

    dst[3] = cpu_to_le32(b0[3]);

}