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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