ILD

AES算法与实现:c与php版
作者:Herbert Yuan 邮箱:yuanjp89@163.com
发布时间:2017-7-30 站点:Inside Linux Development

1 AES算法简介

TODO


2 AES算法原理

TODO


3 c实现

c代码如下,包括aes.h和aes.c两个文件,以下实现未经过严格验证,仅做学习参考之用,建议使用相关成熟库的接口。


aes.h

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#ifndef __AES_H__
#define __AES_H__
 
#ifdef __cplusplus
extern "C" 
{
#endif
 
/* don't change the enum value, because use it as index */
typedef enum _AES_PACKET_BITS
{
    AES_PACKET_128 = 0,
    AES_PACKET_192 = 1,
    AES_PACKET_256 = 2,
} AES_PACKET_BITS;
 
/* don't change the enum value, because use it as index */
typedef enum _AES_KEY_BITS
{
    AES_KEY_128 = 0,
    AES_KEY_192 = 1,
    AES_KEY_256 = 2,
}AES_KEY_BITS;
 
void AES_encrypt(unsigned char *plaintext, unsigned char *ciphertext, 
    unsigned char * key, AES_PACKET_BITS packet_bits, AES_KEY_BITS key_bits);
 
void AES_decrypt(unsigned char *ciphertext, unsigned char *plaintext, 
    unsigned char * key, AES_PACKET_BITS packet_bits, AES_KEY_BITS key_bits);
 
#ifdef __cplusplus
}
#endif
 
#endif


aes.c

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/******************************************************************
 * the Advanced Encryption Standard (AES) algorithm C/C++ implementation
 * Author: yuanjp@hust.edu.cn
 * Reference: 
    [1] xelz, http://mingcn.cnblogs.com
   [2] http://blog.sina.com.cn/s/blog_4985a6a301000837.html
    [3] http://wenku.baidu.com/view/bf22e66eb84ae45c3b358c33.html
    [4] http://wenku.baidu.com/view/2f486221dd36a32d737581fd.html
    [5] http://www.cnblogs.com/linxr/archive/2010/07/29/1927006.html
    [6] http://blog.csdn.net/chence19871/article/details/27653805
 * 2014/11/7 23:11
 ******************************************************************/
 
#include "AES.h"
 
#define TEST_AES 0
 
#if TEST_AES
#include <stdio.h>
#define DBG_PRINTF(format, ...) printf(format, ##__VA_ARGS__)
#else
#define DBG_PRINTF
#endif
 
static unsigned char sBox[256] = 
/*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f */ 
    0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, /*0*/  
    0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, /*1*/
    0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, /*2*/ 
    0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, /*3*/ 
    0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, /*4*/ 
    0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, /*5*/
    0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, /*6*/  
    0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, /*7*/ 
    0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, /*8*/ 
    0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, /*9*/ 
    0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, /*a*/
    0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, /*b*/
    0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, /*c*/ 
    0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, /*d*/
    0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, /*e*/ 
    0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16  /*f*/
};
 
static unsigned char invsBox[256] = 
/*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f  */  
    0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb, /*0*/ 
    0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb, /*1*/
    0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e, /*2*/ 
    0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25, /*3*/ 
    0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92, /*4*/ 
    0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84, /*5*/ 
    0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06, /*6*/ 
    0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b, /*7*/
    0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73, /*8*/ 
    0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e, /*9*/
    0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b, /*a*/
    0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4, /*b*/ 
    0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f, /*c*/ 
    0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef, /*d*/ 
    0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61, /*e*/ 
    0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d  /*f*/
};
 
/* MAX 256bits, 8 WORD, A WORD a colomn */
#define MAX_WORD   8
#define AES_ROWS   4
#define MAX_ROUND  14
 
/* AES算法采用的既约多项式 m(x) = x^8 + x^4 + x^3 + x + 1 */
static unsigned char Rcon[] = 
{
    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, 0x91
};
 
static unsigned char s_rounds[3][3] = 
{
    10, 12, 14,
    12, 12, 14,
    14, 14, 14,
};
 
static unsigned char s_cols[3] = 
{
    4, 6, 8
};
 
#define MAX_SHIFT  4
static unsigned char shift_bytes[3][4] = 
{
    0, 1, 2, 3,
    0, 1, 2, 3,
    0, 1, 3, 4,
};
 
static unsigned char MULTI_COEF[4][4] = 
{
    0x02, 0x03, 0x01, 0x01,
    0x01, 0x02, 0x03, 0x01,
    0x01, 0x01, 0x02, 0x03,
    0x03, 0x01, 0x01, 0x02,
};
 
static unsigned char INV_MULTI_COEF[4][4] =
{
    0x0e, 0x0b, 0x0d, 0x09,
    0x09, 0x0e, 0x0b, 0x0d,
    0x0d, 0x09, 0x0e, 0x0b,
    0x0b, 0x0d, 0x09, 0x0e,
};
 
/* Galois Field multiplication operation */
static unsigned char GF_Multi(unsigned char a, unsigned char b)
{  
    unsigned char bw[4];
    unsigned char res=0;
    int i;
    bw[0] = b;
    for(i=1; i<4; i++)
    {
        bw[i] = bw[i-1] << 1;
        if(bw[i-1] & 0x80)
        {
            bw[i] ^= 0x1b;
        }
    }
    for(i=0; i<4; i++)
    {
        if((a >> i) & 0x01)
        {
            res ^= bw[i];
        }
    }
    return res;
}
 
/*
 * note: encrypt and decrypt use the same expanded keys
    and the same Add Round Key algorithm
 * because Add Round Key is symmetrically invertible
 * state1 ^  key =  state2 <==> state2 ^  key =  state1
 * 1^0=1 <==> 1^0=1
 * 1^1=0 <==> 0^1=1
 * 0^0=0 <==> 0^0=0
 * 0^1=1 <==> 1^1=0
 */
static void ExpandKey(unsigned char round_key[4][MAX_WORD*(MAX_ROUND+1)], unsigned char * key,
    int Nk, int round_key_word)
{
    int i, j;
    for (i = 0; i < Nk; i++)
    {
        for (j = 0; j < AES_ROWS; j++)
        {
            round_key[j][i] = key[j + AES_ROWS * i];
        }
    }
    for (i = Nk; i < round_key_word; i++)
    {
        if ( i % Nk == 0 )
        {
            /* column i-1: 
                * rotate shift 1 (a, b, c, d) -> (b, c, d, a)
                * sBox substitute
                * xor round const (Rcon, 0, 0, 0)
                */
            round_key[0][i] = sBox[round_key[1][i-1]] ^ Rcon[i/Nk-1] ^ round_key[0][i-Nk];
            round_key[1][i] = sBox[round_key[2][i-1]] ^ round_key[1][i-Nk];
            round_key[2][i] = sBox[round_key[3][i-1]] ^ round_key[2][i-Nk];
            round_key[3][i] = sBox[round_key[0][i-1]] ^ round_key[3][i-Nk];
        }
        else
        {
            if (Nk > 6 && (i % Nk) == 4)
            {
                round_key[0][i] = sBox[round_key[0][i-1]] ^ round_key[0][i-Nk];
                round_key[1][i] = sBox[round_key[1][i-1]] ^ round_key[1][i-Nk];
                round_key[2][i] = sBox[round_key[2][i-1]] ^ round_key[2][i-Nk];
                round_key[3][i] = sBox[round_key[3][i-1]] ^ round_key[3][i-Nk];
            }
            else 
            {
                round_key[0][i] = round_key[0][i-1] ^ round_key[0][i-Nk];
                round_key[1][i] = round_key[1][i-1] ^ round_key[1][i-Nk];
                round_key[2][i] = round_key[2][i-1] ^ round_key[2][i-Nk];
                round_key[3][i] = round_key[3][i-1] ^ round_key[3][i-Nk];
            }
        }
    }
    return;
}
 
void AES_encrypt(unsigned char *plaintext, unsigned char *ciphertext, unsigned char * key, AES_PACKET_BITS packet_bits, AES_KEY_BITS key_bits)
{
    int i, j, k;
    int Nr = s_rounds[packet_bits][key_bits];    /* round number */
    int Nb = s_cols[packet_bits];    /* column number of packet */
    int Nk = s_cols[key_bits];       /* column number of key */
    unsigned char state[4][MAX_WORD]; /* input, internal state and output */
    int round_key_word = Nb * (Nr + 1);      /* column number of expand keys */
    unsigned char round_key[4][MAX_WORD*(MAX_ROUND+1)];       /* expand keys */
    unsigned char shift_temp[MAX_SHIFT];  /* used for Byte Rotation */
     
    /* Expand keys */
    ExpandKey(round_key, key, Nk, round_key_word);
 
    /* Add Round Key */
    for (i = 0; i < AES_ROWS; i++)
    {
        for (j = 0; j < Nb; j++)
        {
            state[i][j] = plaintext[i + j * AES_ROWS] ^ round_key[i][j];
        }
    }
 
    for (i = 1; i <= Nr; i++)
    {
        /* Byte Substitute */
        for (j = 0; j < 4 ; j++)
        {
            for (k = 0; k < Nb; k++)
            {
                state[j][k] = sBox[state[j][k]];
            }
        }
 
        /* Byte Rotation */
        for (j = 1; j < 4; j++)
        {
            int shift_len = shift_bytes[packet_bits][j];
            int r_len = Nb - shift_len;
             
            for ( k = 0; k < shift_len; k++)
            {
                shift_temp[k] = state[j][k];
            }
 
            for (k = 0; k < r_len; k++)
            {
                state[j][k] = state[j][shift_len + k];
            }
 
            for (k = 0; k < shift_len; k++)
            {
                state[j][r_len + k] = shift_temp[k];
            }      
        }
 
        /* Mix Column */
        if (i != Nr)
        {
            for (j = 0; j < Nb; j++)
            {
                unsigned char temp[4];
                for ( k = 0; k < 4; k++)
                    temp[k] = state[k][j];
 
                for ( k = 0; k < 4; k++)
                {
                    state[k][j] = GF_Multi(MULTI_COEF[k][0], temp[0]) 
                        ^ GF_Multi(MULTI_COEF[k][1], temp[1])
                        ^ GF_Multi(MULTI_COEF[k][2], temp[2]) 
                        ^ GF_Multi(MULTI_COEF[k][3], temp[3]);
                }
            }
        }
         
        /* Add Round Key */
        for (j = 0; j < Nb; j++)
        {
            state[0][j] ^= round_key[0][i * Nb + j];
            state[1][j] ^= round_key[1][i * Nb + j];
            state[2][j] ^= round_key[2][i * Nb + j];
            state[3][j] ^= round_key[3][i * Nb + j];
        }
    }
 
    for (i=0; i<Nb; i++)
    {
        for (j=0; j<AES_ROWS; j++)
        {
            ciphertext[i*AES_ROWS+j] = state[j][i];
            DBG_PRINTF("0x%02x ", state[j][i]);
        }
    }
}
 
void AES_decrypt(unsigned char *ciphertext, unsigned char *plaintext, unsigned char * key, AES_PACKET_BITS packet_bits, AES_KEY_BITS key_bits)
{
    int i, j, k;
    int Nr = s_rounds[packet_bits][key_bits];    /* round number */
    int Nb = s_cols[packet_bits];    /* column number of packet */
    int Nk = s_cols[key_bits];       /* column number of key */
    unsigned char state[4][MAX_WORD]; /* input, internal state and output */
    int round_key_word = Nb * (Nr + 1);      /* column number of expand keys */
    unsigned char round_key[4][MAX_WORD*(MAX_ROUND+1)];       /* expand keys */
    unsigned char shift_temp[MAX_SHIFT];  /* used for Byte Rotation */
     
    /* Expand keys */
    ExpandKey(round_key, key, Nk, round_key_word);
 
    /* Add Round Key */
    for (i = 0; i < AES_ROWS; i++)
    {
        for (j = 0; j < Nb; j++)
        {
            state[i][j] = ciphertext[i + j * AES_ROWS] ^ round_key[i][Nr * Nb + j];
        }
    }
 
    for (i = Nr - 1; i >= 0; i--)
    {
        /* inv shift rows        
         * shift left inv_shift = Nb - shift_bytes 
         * or shift right shift_bytes
         */
        for (j = 1; j < 4; j++)
        {
            int shift_len = shift_bytes[packet_bits][j];
            int r_len = Nb - shift_len;
             
            for ( k = 0; k < shift_len; k++)
            {
                shift_temp[k] = state[j][r_len+k];
            }
 
            for (k = r_len -1; k >= 0; k--)
            {
                state[j][k+shift_len] = state[j][k];
            }
 
            for (k = 0; k < shift_len; k++)
            {
                state[j][k] = shift_temp[k];
            }      
        }
 
        /* inv byte substitute */
        for (j = 0; j < 4 ; j++)
        {
            for (k = 0; k < Nb; k++)
            {
                state[j][k] = invsBox[state[j][k]];
            }
        }
         
        /* add round key */
        for (j = 0; j < Nb; j++)
        {
            state[0][j] ^= round_key[0][i * Nb + j];
            state[1][j] ^= round_key[1][i * Nb + j];
            state[2][j] ^= round_key[2][i * Nb + j];
            state[3][j] ^= round_key[3][i * Nb + j];
        }
 
        /* inv mix column */
        if (i)
        {
            for (j = 0; j < Nb; j++)
            {
                unsigned char temp[4];
                for ( k = 0; k < 4; k++)
                    temp[k] = state[k][j];
 
                for ( k = 0; k < 4; k++)
                {
                    state[k][j] = GF_Multi(INV_MULTI_COEF[k][0], temp[0]) 
                        ^ GF_Multi(INV_MULTI_COEF[k][1], temp[1])
                        ^ GF_Multi(INV_MULTI_COEF[k][2], temp[2]) 
                        ^ GF_Multi(INV_MULTI_COEF[k][3], temp[3]);
                }
            }
        }
    }
 
     
    for (i=0; i<Nb; i++)
    {
        for (j=0; j<AES_ROWS; j++)
        {
            plaintext[i*AES_ROWS+j] = state[j][i];
            DBG_PRINTF("0x%02x ", state[j][i]);
        }
    }
 
}


4 PHP实现

aes.php,以下实现未经过严格验证,仅做学习参考之用,建议使用相关成熟库的接口。

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<?php
 
/******************************************************************
 * the Advanced Encryption Standard (AES) algorithm php implementation
 * Author: yuanjp@hust.edu.cn
 * Reference: 
    [1] xelz, http://mingcn.cnblogs.com
   [2] http://blog.sina.com.cn/s/blog_4985a6a301000837.html
    [3] http://wenku.baidu.com/view/bf22e66eb84ae45c3b358c33.html
    [4] http://wenku.baidu.com/view/2f486221dd36a32d737581fd.html
    [5] http://www.cnblogs.com/linxr/archive/2010/07/29/1927006.html
    [6] http://blog.csdn.net/chence19871/article/details/27653805
 * 2014/11/23 0:05
 ******************************************************************/
  
    $sBox array(
     /*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f */ 
        0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, /*0*/  
        0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, /*1*/
        0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, /*2*/ 
        0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, /*3*/ 
        0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, /*4*/ 
        0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, /*5*/
        0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, /*6*/  
        0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, /*7*/ 
        0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, /*8*/ 
        0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, /*9*/ 
        0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, /*a*/
        0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, /*b*/
        0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, /*c*/ 
        0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, /*d*/
        0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, /*e*/ 
        0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16  /*f*/
    );
     
    $invsBox array(
        /*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f  */  
        0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb, /*0*/ 
        0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb, /*1*/
        0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e, /*2*/ 
        0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25, /*3*/ 
        0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92, /*4*/ 
        0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84, /*5*/ 
        0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06, /*6*/ 
        0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b, /*7*/
        0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73, /*8*/ 
        0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e, /*9*/
        0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b, /*a*/
        0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4, /*b*/ 
        0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f, /*c*/ 
        0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef, /*d*/ 
        0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61, /*e*/ 
        0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d  /*f*/
    );
 
    define("MAX_WORD", 8);
    define("AES_ROWS", 4);
    define("MAX_ROUND", 14);
     
    /* AES算法采用的既约多项式 m(x) = x^8 + x^4 + x^3 + x + 1 */
    $Rcon array(
        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, 0x91
    );
 
    // 3*3
    $s_rounds array(
        10, 12, 14,
        12, 12, 14,
        14, 14, 14,
    );
 
    $s_cols array(
        4, 6, 8
    );
     
    $packet_bits_index array(
        "AES_PACKET_128" => 0,
        "AES_PACKET_192" => 1,
        "AES_PACKET_256" => 2,
    );
     
    $key_bits_index array(
        "AES_KEY_128" => 0,
        "AES_KEY_192" => 1,
        "AES_KEY_256" => 2,
    );
     
    define("MAX_SHIFT", 4);
    // 3*4
    $shift_bytes array(
        0, 1, 2, 3,
        0, 1, 2, 3,
        0, 1, 3, 4,
    );
 
    // 4 * 4;
    $MULTI_COEF array(
        0x02, 0x03, 0x01, 0x01,
        0x01, 0x02, 0x03, 0x01,
        0x01, 0x01, 0x02, 0x03,
        0x03, 0x01, 0x01, 0x02,
    );
 
    // 4 * 4;
    $INV_MULTI_COEF array(
        0x0e, 0x0b, 0x0d, 0x09,
        0x09, 0x0e, 0x0b, 0x0d,
        0x0d, 0x09, 0x0e, 0x0b,
        0x0b, 0x0d, 0x09, 0x0e,
    );
 
    function GF_Multi($a$b)
    {  
        $bw array();
        $res = 0;
        $i = 0;
        $bw[0] = $b;
        for($i=1; $i<4; $i++)
        {
            $bw[$i] = (($bw[$i-1] << 1) & 0xff);
            if($bw[$i-1] & 0x80)
            {
                $bw[$i] ^= 0x1b;
            }
        }
        for($i=0; $i<4; $i++)
        {
            if(($a >> $i) & 0x01)
            {
                $res ^= $bw[$i];
            }
        }
        return $res;
    }
     
    function ExpandKey($key$Nk$expand_key_cols)
    {
        global $sBox$Rcon;
        $round_key array(array(), array(), array(), array());
        for ($i = 0; $i $Nk$i++)
        {
            for ($j = 0; $j < AES_ROWS; $j++)
            {
                $round_key[$j][$i] = $key[$j + AES_ROWS * $i];
            }
        }
        for ($i $Nk$i $expand_key_cols$i++)
        {
            if $i $Nk == 0 )
            {
                $round_key[0][$i] = $sBox[$round_key[1][$i-1]] ^ $Rcon[$i/$Nk-1] ^ $round_key[0][$i-$Nk];
                $round_key[1][$i] = $sBox[$round_key[2][$i-1]] ^ $round_key[1][$i-$Nk];
                $round_key[2][$i] = $sBox[$round_key[3][$i-1]] ^ $round_key[2][$i-$Nk];
                $round_key[3][$i] = $sBox[$round_key[0][$i-1]] ^ $round_key[3][$i-$Nk];
            }
            else
            {
                if ($Nk > 6 && ($i $Nk) == 4)
                {
                    $round_key[0][$i] = $sBox[$round_key[0][$i-1]] ^ $round_key[0][$i-$Nk];
                    $round_key[1][$i] = $sBox[$round_key[1][$i-1]] ^ $round_key[1][$i-$Nk];
                    $round_key[2][$i] = $sBox[$round_key[2][$i-1]] ^ $round_key[2][$i-$Nk];
                    $round_key[3][$i] = $sBox[$round_key[3][$i-1]] ^ $round_key[3][$i-$Nk];
                }
                else 
                {
                    $round_key[0][$i] = $round_key[0][$i-1] ^ $round_key[0][$i-$Nk];
                    $round_key[1][$i] = $round_key[1][$i-1] ^ $round_key[1][$i-$Nk];
                    $round_key[2][$i] = $round_key[2][$i-1] ^ $round_key[2][$i-$Nk];
                    $round_key[3][$i] = $round_key[3][$i-1] ^ $round_key[3][$i-$Nk];
                }
            }
        }
        return $round_key;
    }
 
    function AES_encrypt($plaintext$packet_bits$key$key_bits)
    {
        global $sBox$s_rounds$s_cols$shift_bytes$MULTI_COEF$packet_bits_index$key_bits_index;
        if ( !isset($packet_bits_index[$packet_bits]) || !isset($key_bits_index[$key_bits]) )
        {
            echo "<p>AES_encrypt error: Invalid parameter packet_bits or key_bits</p>";
            return false;
        }
        $pbi $packet_bits_index[$packet_bits];
        $kbi $key_bits_index[$key_bits];
        $Nr $s_rounds[$pbi*3 + $kbi]; /* round number */
        $Nb $s_cols[$pbi];  /* column number of packet */
        $Nk $s_cols[$kbi];      /* column number of key */
        $state array(array(), array(), array(), array()); /* input, internal state and output */
        $round_key_cols $Nb * ($Nr + 1);        /* column number of expand keys */
        $shift_temp array();
        $temp array();
        $ciphertext array();
                 
        /* Expand keys */
        $round_key = ExpandKey($key$Nk$round_key_cols);
         
        /* Add Round Key */
        for ($i = 0; $i < AES_ROWS; $i++)
        {
            for ($j = 0; $j $Nb$j++)
            {
                $state[$i][$j] = $plaintext[$i $j * AES_ROWS] ^ $round_key[$i][$j];
            }
        }
         
        for ($i = 1; $i <= $Nr$i++)
        {
            /* Byte Substitute */
            for ($j = 0; $j < 4 ; $j++)
            {
                for ($k = 0; $k $Nb$k++)
                {
                    $state[$j][$k] = $sBox[$state[$j][$k]];
                }
            }
 
             
            /* Byte Rotation */
            for ($j = 1; $j < 4; $j++)
            {
                $shift_len $shift_bytes[$pbi*4 + $j];
                $r_len $Nb $shift_len;
                 
                for $k = 0; $k $shift_len$k++)
                {
                    $shift_temp[$k] = $state[$j][$k];
                }
 
                for ($k = 0; $k $r_len$k++)
                {
                    $state[$j][$k] = $state[$j][$shift_len $k];
                }
 
                for ($k = 0; $k $shift_len$k++)
                {
                    $state[$j][$r_len $k] = $shift_temp[$k];
                }      
            }          
             
            /* Mix Column */
            if ($i != $Nr)
            {
                for ($j = 0; $j $Nb$j++)
                {
                    for $k = 0; $k < 4; $k++)
                        $temp[$k] = $state[$k][$j];
 
                    for $k = 0; $k < 4; $k++)
                    {
                        $state[$k][$j] = GF_Multi($MULTI_COEF[$k*4 + 0], $temp[0]) 
                            ^ GF_Multi($MULTI_COEF[$k*4 + 1], $temp[1])
                            ^ GF_Multi($MULTI_COEF[$k*4 + 2], $temp[2]) 
                            ^ GF_Multi($MULTI_COEF[$k*4 + 3], $temp[3]);
                    }
                }
            }
                         
            /* Add Round Key */
            for ($j = 0; $j $Nb$j++)
            {
                $state[0][$j] ^= $round_key[0][$i $Nb $j];
                $state[1][$j] ^= $round_key[1][$i $Nb $j];
                $state[2][$j] ^= $round_key[2][$i $Nb $j];
                $state[3][$j] ^= $round_key[3][$i $Nb $j];
            }
             
        }
 
        for ($i=0; $i<$Nb$i++)
        {
            for ($j=0; $j<AES_ROWS; $j++)
            {
                $ciphertext[$i*AES_ROWS+$j] = $state[$j][$i];
            }
        }
             
        return $ciphertext;
    }
 
    function AES_decrypt($ciphertext$packet_bits$key$key_bits)
    {
        global $invsBox$s_rounds$s_cols$shift_bytes$INV_MULTI_COEF$packet_bits_index$key_bits_index;
        if ( !isset($packet_bits_index[$packet_bits]) || !isset($key_bits_index[$key_bits]) )
        {
            echo "<p>AES_decrypt error: Invalid parameter packet_bits or key_bits</p>";
            return false;
        }
        $pbi $packet_bits_index[$packet_bits];
        $kbi $key_bits_index[$key_bits];
        $Nr $s_rounds[$pbi*3 + $kbi]; /* round number */
        $Nb $s_cols[$pbi];  /* column number of packet */
        $Nk $s_cols[$kbi];      /* column number of key */
        $state array(array(), array(), array(), array()); /* input, internal state and output */
        $round_key_cols $Nb * ($Nr + 1);        /* column number of expand keys */
        $shift_temp array();
        $temp array();
        $plaintext array();
                 
        /* Expand keys */
        $round_key = ExpandKey($key$Nk$round_key_cols);
         
        /* Add Round Key */
        for ($i = 0; $i < AES_ROWS; $i++)
        {
            for ($j = 0; $j $Nb$j++) 
            {
                $state[$i][$j] = $ciphertext[$i $j * AES_ROWS] ^ $round_key[$i][$Nr $Nb $j];
            }
        }
                 
        for ($i $Nr - 1; $i >= 0; $i--)
        {
            for ($j = 1; $j < 4; $j++)
            {
                $shift_len $shift_bytes[$pbi*4 + $j];
                $r_len $Nb $shift_len;
                for $k = 0; $k $shift_len$k++)
                {
                    $shift_temp[$k] = $state[$j][$r_len+$k];
                }
 
                for ($k $r_len -1; $k >= 0; $k--)
                {
                    $state[$j][$k+$shift_len] = $state[$j][$k];
                }
 
                for ($k = 0; $k $shift_len$k++)
                {
                    $state[$j][$k] = $shift_temp[$k];
                }      
            }
         
            /* inv byte substitute */
            for ($j = 0; $j < 4 ; $j++)
            {
                for ($k = 0; $k $Nb$k++)
                {
                    $state[$j][$k] = $invsBox[$state[$j][$k]];
                }
            }          
         
            /* add round key */
            for ($j = 0; $j $Nb$j++)
            {
                $state[0][$j] ^= $round_key[0][$i $Nb $j];
                $state[1][$j] ^= $round_key[1][$i $Nb $j];
                $state[2][$j] ^= $round_key[2][$i $Nb $j];
                $state[3][$j] ^= $round_key[3][$i $Nb $j];
            }
             
            /* inv mix column */
            if ($i)
            {
                for ($j = 0; $j $Nb$j++)
                {
                    for $k = 0; $k < 4; $k++)
                        $temp[$k] = $state[$k][$j];
 
                    for $k = 0; $k < 4; $k++)
                    {
                        $state[$k][$j] = GF_Multi($INV_MULTI_COEF[$k*4+0], $temp[0]) 
                            ^ GF_Multi($INV_MULTI_COEF[$k*4+1], $temp[1])
                            ^ GF_Multi($INV_MULTI_COEF[$k*4+2], $temp[2]) 
                            ^ GF_Multi($INV_MULTI_COEF[$k*4+3], $temp[3]);
                    }
                }
            }
             
        }
         
        for ($i=0; $i<$Nb$i++)
        {
            for ($j=0; $j<AES_ROWS; $j++)
            {
                $plaintext[$i*AES_ROWS+$j] = $state[$j][$i];
            }
        }
             
        return $plaintext;
    }
     
    function ascii_array_to_str($ascii_array)
    {
        $str "";
        $len count($ascii_array);
        for ($i = 0; $i $len$i++)
            $str .= chr($ascii_array[$i]);
        return $str;
    }
     
    function str_to_ascii_array($str)
    {
        $ascii_array array();
        $len strlen($str);
        for ($i = 0; $i $len$i++)
        {
            $ascii_array[] = ord($str[$i]);
        }
        return $ascii_array;
    }
?>


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