AES加密
AES 是块加密，块的长度是 16 个字节，如果原文不到 16 个字节，则需要填充至 16 个字节后再进行处理。
AES 密文长度 = (原文长度 / 16) * 16 + 16
AES 密文长度 = (原文长度 / 16) * 16 + 16
这里的“/”表示整除
#ifndef __AES_H
#define __AES_H
#ifdef __cplusplus
extern "C" {
#endif
// ÒÔbitΪµ¥Î»µÄÃÜÔ¿³¤¶È£¬Ö»ÄÜΪ 128£¬192 ºÍ 256 ÈýÖÖ
#define AES_KEY_LENGTH 128
// ¼Ó½âÃÜģʽ
#define AES_MODE_ECB 0 // µç×ÓÃÜÂ뱾ģʽ£¨Ò»°ãģʽ£©
#define AES_MODE_CBC 1 // ÃÜÂë·Ö×éÁ´½Óģʽ
#define AES_MODE AES_MODE_CBC
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º AES_Init
// ÃèÊö£º ³õʼ»¯£¬ÔÚ´ËÖ´ÐÐÀ©Õ¹ÃÜÔ¿²Ù×÷¡£
// ÊäÈë²ÎÊý£º pKey -- ÔʼÃÜÔ¿£¬Æ䳤¶È±ØÐëΪ AES_KEY_LENGTH/8 ×Ö½Ú¡£
// Êä³ö²ÎÊý£º ÎÞ¡£
// ·µ»ØÖµ£º ÎÞ¡£
///////////////////////////////////////////////////////////////////////////////
void AES_Init(const void *pKey);
//////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º AES_Encrypt
// ÃèÊö£º ¼ÓÃÜÊý¾Ý
// ÊäÈë²ÎÊý£º pPlainText -- Ã÷ÎÄ£¬¼´Ðè¼ÓÃܵÄÊý¾Ý£¬Æ䳤¶ÈΪnDataLen×Ö½Ú¡£
// nDataLen -- Êý¾Ý³¤¶È£¬ÒÔ×Ö½ÚΪµ¥Î»£¬±ØÐëΪAES_KEY_LENGTH/8µÄÕû±¶Êý¡£
// pIV -- ³õʼ»¯ÏòÁ¿£¬Èç¹ûʹÓÃECBģʽ£¬¿ÉÉèΪNULL¡£
// Êä³ö²ÎÊý£º pCipherText -- ÃÜÎÄ£¬¼´ÓÉÃ÷ÎļÓÃܺóµÄÊý¾Ý£¬¿ÉÒÔÓëpPlainTextÏàͬ¡£
// ·µ»ØÖµ£º ÎÞ¡£
//////////////////////////////////////////////////////////////////////////
void AES_Encrypt(const unsigned char *pPlainText, unsigned char *pCipherText,
unsigned int nDataLen, const unsigned char *pIV);
//////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º AES_Decrypt
// ÃèÊö£º ½âÃÜÊý¾Ý
// ÊäÈë²ÎÊý£º pCipherText -- ÃÜÎÄ£¬¼´Ðè½âÃܵÄÊý¾Ý£¬Æ䳤¶ÈΪnDataLen×Ö½Ú¡£
// nDataLen -- Êý¾Ý³¤¶È£¬ÒÔ×Ö½ÚΪµ¥Î»£¬±ØÐëΪAES_KEY_LENGTH/8µÄÕû±¶Êý¡£
// pIV -- ³õʼ»¯ÏòÁ¿£¬Èç¹ûʹÓÃECBģʽ£¬¿ÉÉèΪNULL¡£
// Êä³ö²ÎÊý£º pPlainText -- Ã÷ÎÄ£¬¼´ÓÉÃÜÎĽâÃܺóµÄÊý¾Ý£¬¿ÉÒÔÓëpCipherTextÏàͬ¡£
// ·µ»ØÖµ£º ÎÞ¡£
//////////////////////////////////////////////////////////////////////////
void AES_Decrypt(unsigned char *pPlainText, const unsigned char *pCipherText,
unsigned int nDataLen, const unsigned char *pIV);
//¶ÔÊý¾Ý½øÐнâÃܲÙ×÷£¬³É¹¦·µ»Ø1£¬Ê§°Ü·µ»Ø0
unsigned char app_data_encode_aes(char *input, char *output, unsigned short *slen);
unsigned char app_data_decode_aes(unsigned char *input, char *output, unsigned short *slen);
unsigned int AES_Encrypt_PKCS7(const unsigned char *pPlainText, unsigned char *pCipherText,
unsigned int nDataLen, const unsigned char *pIV);
unsigned int AES_get_length(unsigned int length);
void AES_free(unsigned char* p);
#ifdef __cplusplus
}
#endif
#endif // __AES_H
#include "aes.h"
//#include "malloc.h"
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
// ΪÁËÄÜÕë¶ÔC51½øÐÐÓÅ»¯£¬²¢ÇÒÓÖʹ´úÂë¿ÉÓÃÓÚARMºÍPCµÈ»·¾³£¬
// ÔÚ·ÇC51»·¾³£¨Ã»Óж¨Òå__C51__£©ÏÂÐèÒª°ÑC51Ìض¨µÄ¹Ø¼ü×Ö¶¨ÒåΪ¿Õ
#ifndef __C51__
#define code
#define data
#define idata
#define xdata
#define pdata
typedef unsigned char BOOL;
#else
typedef bit BOOL;
#endif
#define Nk (AES_KEY_LENGTH / 32) // ÒÔ¡°×Ö¡±£¨4×Ö½Ú£©Îªµ¥Î»µÄÃÜÔ¿³¤¶È
#define Nb 4 // ÒÔ¡°×Ö¡±£¨4×Ö½Ú£©Îªµ¥Î»µÄ¼Ó½âÃÜÊý¾Ý¿é´óС£¬¹Ì¶¨Îª4
// Nr£º¼ÓÃܵÄÂÖÊý
#if AES_KEY_LENGTH == 128
#define Nr 10
#elif AES_KEY_LENGTH == 192
#define Nr 12
#elif AES_KEY_LENGTH == 256
#define Nr 14
#else
#error AES_KEY_LENGTH must be 128, 192 or 256 BOOLs!
#endif
// GF(28) ¶àÏîʽ
#define BPOLY 0x1B // Lower 8 BOOLs of (x^8 + x^4 + x^3 + x + 1), ie. (x^4 + x^3 + x + 1).
// AES×ÓÃÜÔ¿±í£¬µ±ÃÜÔ¿³¤¶ÈΪ128λʱ£¬Õ¼ÓÃ176×Ö½Ú¿Õ¼ä
static xdata unsigned char g_roundKeyTable[4*Nb*(Nr+1)];
// ¼ÓÃÜÓõÄSBox
static code const 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
};// ½âÃÜÓõÄSBox
static code const unsigned char InvSBox[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
};
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º RotationWord
// ÃèÊö£º ¶ÔÒ»¸ö¡°×Ö¡±Êý¾Ý½øÐÐÑ»·ÓÒÒÆ¡£
// ÊäÈë²ÎÊý£º pWord -- ÒªÓÒÒƵÄ4×Ö½ÚÊý¾Ý¡£
// Êä³ö²ÎÊý£º pWord -- ÓÒÒƺóµÄ4×Ö½ÚÊý¾Ý¡£
// ·µ»ØÖµ£º ÎÞ¡£
///////////////////////////////////////////////////////////////////////////////
static void RotationWord(unsigned char *pWord)
{
unsigned char temp = pWord[0];
pWord[0] = pWord[1];
pWord[1] = pWord[2];
pWord[2] = pWord[3];
pWord[3] = temp;
}
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º XorBytes
// ÃèÊö£º ÅúÁ¿Òì»òÁ½×éÊý¾Ý¡£
// ÊäÈë²ÎÊý£º pData1 -- ÒªÒì»òµÄµÚÒ»×éÊý¾Ý¡£
// pData1 -- ÒªÒì»òµÄµÚ¶þ×éÊý¾Ý¡£
// nCount -- ÒªÒì»òµÄÊý¾Ý³¤¶È¡£
// Êä³ö²ÎÊý£º pData1 -- Òì»òºóµÄ½á¹û¡£
// ·µ»ØÖµ£º ÎÞ¡£
///////////////////////////////////////////////////////////////////////////////
static void XorBytes(unsigned char *pData1, const unsigned char *pData2, unsigned char nCount)
{
unsigned char i;
for (i = 0; i < nCount; i++)
{
pData1[i] ^= pData2[i];
}
}
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º AddRoundKey
// ÃèÊö£º °Ñ Öмä״̬Êý¾Ý ¼ÓÉÏ£¨Òì»ò£©×ÓÃÜÔ¿£¬Êý¾Ý³¤¶ÈΪ16×Ö½Ú¡£
// ÊäÈë²ÎÊý£º pState -- ״̬Êý¾Ý¡£
// pRoundKey -- ×ÓÃÜÔ¿Êý¾Ý¡£
// Êä³ö²ÎÊý£º pState -- ¼ÓÉÏ×ÓÃÜÔ¿ºóµÄ״̬Êý¾Ý¡£
// ·µ»ØÖµ£º ÎÞ¡£
///////////////////////////////////////////////////////////////////////////////
// static void AddRoundKey(unsigned char *pState, const unsigned char *pRoundKey)
// {
// XorBytes(pState, pRoundKey, 4*Nb);
// }
// AddRoundKeyµÄºêÐÎʽ£¬±Èº¯ÊýÐÎʽ¿ÉÒÔ½ÚÊ¡4×Ö½ÚµÄdataÊý¾Ý
#define AddRoundKey(pState, pRoundKey) \
XorBytes((pState), (pRoundKey), 4*Nb)
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º SubBytes
// ÃèÊö£º ͨ¹ýSºÐ×ÓÖû»×´Ì¬Êý¾Ý¡£
// ÊäÈë²ÎÊý£º pState -- ״̬Êý¾Ý¡£
// nCount -- ״̬Êý¾Ý³¤¶È¡£
// bInvert -- ÊÇ·ñʹÓ÷´ÏòSºÐ×Ó£¨½âÃÜʱʹÓã©¡£
// Êä³ö²ÎÊý£º pState -- Öû»ºóµÄ״̬Êý¾Ý¡£
// ·µ»ØÖµ£º ÎÞ¡£
///////////////////////////////////////////////////////////////////////////////
static void SubBytes(unsigned char *pState, unsigned char nCount, BOOL bInvert)
{
unsigned char i;
const unsigned char code *pSBox = bInvert ? InvSBox : SBox;
for (i = 0; i < nCount; i++)
{
pState[i] = pSBox[pState[i]];
}
}
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º ShiftRows
// ÃèÊö£º °Ñ״̬Êý¾ÝÒÆÐС£
// ÊäÈë²ÎÊý£º pState -- ״̬Êý¾Ý¡£
// bInvert -- ÊÇ·ñ·´ÏòÒÆÐУ¨½âÃÜʱʹÓã©¡£
// Êä³ö²ÎÊý£º pState -- ÒÆÐкóµÄ״̬Êý¾Ý¡£
// ·µ»ØÖµ£º ÎÞ¡£
///////////////////////////////////////////////////////////////////////////////
static void ShiftRows(unsigned char *pState, BOOL bInvert)
{
// ×¢Ò⣺״̬Êý¾ÝÒÔÁÐÐÎʽ´æ·Å£¡
unsigned char r; // row£¬ ÐÐ
unsigned char c; // column£¬ÁÐ
unsigned char temp;
unsigned char rowData[4];
for (r = 1; r < 4; r++)
{
// ±¸·ÝÒ»ÐÐÊý¾Ý
for (c = 0; c < 4; c++)
{
rowData[c] = pState[r + 4*c];
}
temp = bInvert ? (4 - r) : r;
for (c = 0; c < 4; c++)
{
pState[r + 4*c] = rowData[(c + temp) % 4];
}
}
}
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º GfMultBy02
// ÃèÊö£º ÔÚGF(28)ÓòµÄ ³Ë2 ÔËËã¡£
// ÊäÈë²ÎÊý£º num -- ³ËÊý¡£
// Êä³ö²ÎÊý£º ÎÞ¡£
// ·µ»ØÖµ£º num³ËÒÔ2µÄ½á¹û¡£
///////////////////////////////////////////////////////////////////////////////
static unsigned char GfMultBy02(unsigned char num)
{
if ((num & 0x80) == 0)
{
num = num << 1;
}
else
{
num = (num << 1) ^ BPOLY;
}
return num;
}
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º MixColumns
// ÃèÊö£º »ìºÏ״̬¸÷ÁÐÊý¾Ý¡£
// ÊäÈë²ÎÊý£º pState -- ״̬Êý¾Ý¡£
// bInvert -- ÊÇ·ñ·´Ïò»ìºÏ£¨½âÃÜʱʹÓã©¡£
// Êä³ö²ÎÊý£º pState -- »ìºÏÁкóµÄ״̬Êý¾Ý¡£
// ·µ»ØÖµ£º ÎÞ¡£
///////////////////////////////////////////////////////////////////////////////
static void MixColumns(unsigned char *pState, BOOL bInvert)
{
unsigned char i;
unsigned char temp;
unsigned char a0Pa2_M4; // 4(a0 + a2)
unsigned char a1Pa3_M4; // 4(a1 + a3)
unsigned char result[4];
for (i = 0; i < 4; i++, pState += 4)
{
// b0 = 2a0 + 3a1 + a2 + a3
// = (a0 + a1 + a2 + a3) + 2(a0 + a1) + a0
temp = pState[0] ^ pState[1] ^ pState[2] ^ pState[3]; result[0] = temp ^ pState[0] ^ GfMultBy02((unsigned char) (pState[0] ^ pState[1]));
result[1] = temp ^ pState[1] ^ GfMultBy02((unsigned char) (pState[1] ^ pState[2]));
result[2] = temp ^ pState[2] ^ GfMultBy02((unsigned char) (pState[2] ^ pState[3]));
result[3] = temp ^ pState[3] ^ GfMultBy02((unsigned char) (pState[3] ^ pState[0]));
if (bInvert)
{
// b0' = 14a0 + 11a1 + 13a2 + 9a3
// = (a0 + a1 + a2 + a3) + 2(a0 + a1) + a0 £¨Õⲿ·ÖΪb0£©
// + 2(4(a0 + a2) + 4(a1 + a3))
// + 4(a0 + a2)
a0Pa2_M4 = GfMultBy02(GfMultBy02((unsigned char) (pState[0] ^ pState[2])));
a1Pa3_M4 = GfMultBy02(GfMultBy02((unsigned char) (pState[1] ^ pState[3])));
temp = GfMultBy02((unsigned char) (a0Pa2_M4 ^ a1Pa3_M4));
result[0] ^= temp ^ a0Pa2_M4;
result[1] ^= temp ^ a1Pa3_M4;
result[2] ^= temp ^ a0Pa2_M4;
result[3] ^= temp ^ a1Pa3_M4;
}
memcpy(pState, result, 4);
}
}
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º BlockEncrypt
// ÃèÊö£º ¶Ôµ¥¿éÊý¾Ý¼ÓÃÜ¡£
// ÊäÈë²ÎÊý£º pState -- ״̬Êý¾Ý¡£
// Êä³ö²ÎÊý£º pState -- ¼ÓÃܺóµÄ״̬Êý¾Ý¡£
// ·µ»ØÖµ£º ÎÞ¡£
///////////////////////////////////////////////////////////////////////////////
static void BlockEncrypt(unsigned char *pState)
{
unsigned char i;
AddRoundKey(pState, g_roundKeyTable);
for (i = 1; i <= Nr; i++) // i = [1, Nr]
{
SubBytes(pState, 4*Nb, 0);
ShiftRows(pState, 0);
if (i != Nr)
{
MixColumns(pState, 0);
}
AddRoundKey(pState, &g_roundKeyTable[4*Nb*i]);
}
// ΪÁ˽ÚÊ¡´úÂ룬ºÏ²¢µ½Ñ»¯Ö´ÐÐ
// SubBytes(pState, 4*Nb);
// ShiftRows(pState, 0);
// AddRoundKey(pState, &g_roundKeyTable[4*Nb*Nr]);
}
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º BlockDecrypt
// ÃèÊö£º ¶Ôµ¥¿éÊý¾Ý½âÃÜ¡£
// ÊäÈë²ÎÊý£º pState -- ״̬Êý¾Ý¡£
// Êä³ö²ÎÊý£º pState -- ½âÃܺóµÄ״̬Êý¾Ý¡£
// ·µ»ØÖµ£º ÎÞ¡£
///////////////////////////////////////////////////////////////////////////////
static void BlockDecrypt(unsigned char *pState)
{
unsigned char i;
AddRoundKey(pState, &g_roundKeyTable[4*Nb*Nr]);
for (i = Nr; i > 0; i--) // i = [Nr, 1]
{
ShiftRows(pState, 1);
SubBytes(pState, 4*Nb, 1);
AddRoundKey(pState, &g_roundKeyTable[4*Nb*(i-1)]);
if (i != 1)
{
MixColumns(pState, 1);
}
}
}
///////////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º AES_Init
// ÃèÊö£º ³õʼ»¯£¬ÔÚ´ËÖ´ÐÐÀ©Õ¹ÃÜÔ¿²Ù×÷¡£
// ÊäÈë²ÎÊý£º pKey -- ÔʼÃÜÔ¿£¬Æ䳤¶È±ØÐëΪ AES_KEY_LENGTH/8 ×Ö½Ú¡£
// Êä³ö²ÎÊý£º ÎÞ¡£
// ·µ»ØÖµ£º ÎÞ¡£
///////////////////////////////////////////////////////////////////////////////
void AES_Init(const void *pKey)
{
// À©Õ¹ÃÜÔ¿
unsigned char i;
unsigned char *pRoundKey;
unsigned char Rcon[4] = {0x01, 0x00, 0x00, 0x00};
memcpy(g_roundKeyTable, pKey, 4*Nk);
pRoundKey = &g_roundKeyTable[4*Nk];
for (i = Nk; i < Nb*(Nr+1); pRoundKey += 4, i++)
{
memcpy(pRoundKey, pRoundKey - 4, 4);
if (i % Nk == 0)
{
RotationWord(pRoundKey);
SubBytes(pRoundKey, 4, 0);
XorBytes(pRoundKey, Rcon, 4);
Rcon[0] = GfMultBy02(Rcon[0]);
}
else if (Nk > 6 && i % Nk == Nb)
{
SubBytes(pRoundKey, 4, 0);
}
XorBytes(pRoundKey, pRoundKey - 4*Nk, 4);
}
}
unsigned int AES_get_length(unsigned int length)
{
return ((length>>4) + 1)<<4;
}//////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º AES_Encrypt
// ÃèÊö£º ¼ÓÃÜÊý¾Ý
// ÊäÈë²ÎÊý£º pPlainText -- Ã÷ÎÄ£¬¼´Ðè¼ÓÃܵÄÊý¾Ý£¬Æ䳤¶ÈΪnDataLen×Ö½Ú¡£
// nDataLen -- Êý¾Ý³¤¶È£¬ÒÔ×Ö½ÚΪµ¥Î»
// pIV -- ³õʼ»¯ÏòÁ¿£¬Èç¹ûʹÓÃECBģʽ£¬¿ÉÉèΪNULL¡£
// Êä³ö²ÎÊý£º pCipherText -- ÃÜÎÄ£¬¼´ÓÉÃ÷ÎļÓÃܺóµÄÊý¾Ý£¬¿ÉÒÔÓëpPlainTextÏàͬ¡£
// ·µ»ØÖµ£º ÎÞ¡£
//////////////////////////////////////////////////////////////////////////
unsigned int AES_Encrypt_PKCS7(const unsigned char *pPlainText, unsigned char *pCipherText,
unsigned int nDataLen, const unsigned char *pIV)
{
unsigned int i;
//³¤¶Èµ÷Õû
unsigned int length = nDataLen;
nDataLen = ((nDataLen>>4) + 1)<<4;
uint8_t p=(Nb<<2)-(length%(Nb<<2));
if (pPlainText != pCipherText){memcpy(pCipherText,pPlainText,length);}
//Ìî³ä
unsigned char temp[16];
memset(temp,p,16);
if(length<nDataLen)
{
memcpy(pCipherText + length,temp,nDataLen - length);
}if(length == nDataLen)
{
memcpy(pCipherText + length,temp,16);
}
for (i = nDataLen/(4*Nb); i > 0 ; i--, pCipherText += 4*Nb)
{
#if AES_MODE == AES_MODE_CBC
XorBytes(pCipherText, pIV, 4*Nb);
#endif
BlockEncrypt(pCipherText);
pIV = pCipherText;
}
return(nDataLen);
}//////////////////////////////////////////////////////////////////////////
// º¯ÊýÃû£º AES_Decrypt
// ÃèÊö£º ½âÃÜÊý¾Ý
// ÊäÈë²ÎÊý£º pCipherText -- ÃÜÎÄ£¬¼´Ðè½âÃܵÄÊý¾Ý£¬Æ䳤¶ÈΪnDataLen×Ö½Ú¡£
// nDataLen -- Êý¾Ý³¤¶È£¬ÒÔ×Ö½ÚΪµ¥Î»£¬±ØÐëΪAES_KEY_LENGTH/8µÄÕû±¶Êý¡£
// pIV -- ³õʼ»¯ÏòÁ¿£¬Èç¹ûʹÓÃECBģʽ£¬¿ÉÉèΪNULL¡£
// Êä³ö²ÎÊý£º pPlainText -- Ã÷ÎÄ£¬¼´ÓÉÃÜÎĽâÃܺóµÄÊý¾Ý£¬¿ÉÒÔÓëpCipherTextÏàͬ¡£
// ·µ»ØÖµ£º ÎÞ¡£
//////////////////////////////////////////////////////////////////////////
void AES_Decrypt(unsigned char *pPlainText, const unsigned char *pCipherText,
unsigned int nDataLen, const unsigned char *pIV)
{
unsigned int i;
if (pPlainText != pCipherText)
{
memcpy(pPlainText, pCipherText, nDataLen);
}
// ´Ó×îºóÒ»¿éÊý¾Ý¿ªÊ¼½âÃÜ£¬ÕâÑù²»Óÿª±Ù¿Õ¼äÀ´±£´æIV
pPlainText += nDataLen - 4*Nb;
for (i = nDataLen/(4*Nb); i > 0 ; i--, pPlainText -= 4*Nb)
{
BlockDecrypt(pPlainText);
#if AES_MODE == AES_MODE_CBC
if (i == 1)
{// ×îºóÒ»¿éÊý¾Ý
XorBytes(pPlainText, pIV, 4*Nb);
}
else
{
XorBytes(pPlainText, pPlainText - 4*Nb, 4*Nb);
}
#endif
}
}
main函数测试：
void main(void)
{
int r = 0,i;
unsigned char Encrypt[16]={11,22,33,44,55,66,77,88,99,0,11,22,11,22,33,44};
unsigned char Decrypt[16]={0};
unsigned char temp[16]={0};
unsigned char key[16]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f};
AES_Init(key);
AES_Encrypt_PKCS7 (Encrypt, Decrypt, 16, key);
AES_Decrypt(temp, Decrypt, 16, key);
}temp的值和Encrpy相等！！！！