DES加密C语言代码

ID:400061 · 发表于 2018-9-19 16:06

des加密/解密源代码，代码写的比较清晰，欢迎大家参考！

C语言源程序如下:

/*
*********************************************************************************************************
* MICIRUM BOARD SUPPORT PACKAGE
*
* (c) Copyright 2007-2008; Micrium, Inc.; Weston, FL
*
* All rights reserved. Protected by international copyright laws.
* Knowledge of the source code may not be used to write a similar
* product. This file may only be used in accordance with a license
* and should not be redistributed in any way.
*********************************************************************************************************
*/
/*
*********************************************************************************************************
*
* APPLICATION CODE
*
* des_c.c
* with the
* Y06 Board
*
* Filename : des_c.c
* Version : V1.00
* Programmer(s) : Felix
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* INCLUDE FILES
*********************************************************************************************************
*/
#define DES_GLOBLAS
#include "des_h.h"
/*
*********************************************************************************************************
* LOCAL DEFINES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL CONSTANTS
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL DATA TYPES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL TABLES
*********************************************************************************************************
*/
uc8 initial_tr[64] =
{
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7,
56, 48, 40, 32, 24, 16, 8, 0,
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6
};
uc8 final_tr[64] =
{
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25,
32, 0, 40, 8, 48, 16, 56, 24
};
uc8 swap[64] =
{
33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, 52, 53, 54, 55, 56,
57, 58, 59, 60, 61, 62, 63, 64,
1, 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32
};
uc8 key_tr1[56] =
{
56, 48, 40, 32, 24, 16, 8,
0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26,
18, 10, 2, 59, 51, 43, 35,
62, 54, 46, 38, 30, 22, 14,
6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28,
20, 12, 4, 27, 19, 11, 3
};
uc8 key_tr2[64] =
{
0, 0, 13, 4, 16, 10, 23, 0,
0, 0, 2, 9, 27, 14, 5, 20,
0, 0, 22, 7, 18, 11, 3, 25,
0, 0, 15, 1, 6, 26, 19, 12,
0, 0, 40, 54, 51, 30, 36, 46,
0, 0, 29, 47, 39, 50, 44, 32,
0, 0, 43, 52, 48, 38, 55, 33,
0, 0, 45, 31, 41, 49, 35, 28
};
uc8 etr[64] =
{
0, 0, 31, 4, 0, 1, 2, 3,
0, 0, 3, 8, 4, 5, 6, 7,
0, 0, 7, 12, 8, 9, 10, 11,
0, 0, 11, 16, 12, 13, 14, 15,
0, 0, 15, 20, 16, 17, 18, 19,
0, 0, 19, 24, 20, 21, 22, 23,
0, 0, 23, 28, 24, 25, 26, 27,
0, 0, 27, 0, 28, 29, 30, 31
};
uc8 ptr[32] =
{
31, 14, 39, 44, 60, 23, 55, 36,
4, 30, 46, 53, 12, 37, 62, 21,
5, 15, 47, 29, 63, 54, 6, 20,
38, 28, 61, 13, 45, 22, 7, 52
};
uc8 s[8][64] =
{
{
14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
},
{
15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9
},
{
10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
},
{
7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14
},
{
2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3
},
{
12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13
},
{
4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12
},
{
13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
}
};
uc8 rots[16] =
{
1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
};
uc8 bit_msk[8] =
{
0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01
};
/*
*********************************************************************************************************
* LOCAL GLOBAL VARIABLES
*********************************************************************************************************
*/
static u8 DES_Encrypt_key[]="u23djql3";
static u8 DES_Decrypt_key[]="u23djql3";
static u8 sub_keys[16][8]; //sub_keys[16][8]
static u8 main_key[8];
/*
*********************************************************************************************************
* LOCAL FUNCTION PROTOTYPES
*********************************************************************************************************
*/
static void des(u8 *plain_strng, u8 *key, u8 d, u8 *ciph_strng);
static void transpose(u8 *idata, u8 *odata, uc8 *tbl, u8 n);
static void rotate_l(u8 *key);
static void compute_subkeys(u8 *key);
static void f(u8 *skey, u8 *a_str, u8 *x_str);
static void desEncrypt(u8 *plain_strng, u8 *key, u8 *ciph_strng);
static void desDecipher(u8 *plain_strng, u8 *key, u8 *ciph_strng);
/*
*********************************************************************************************************
* LOCAL CONFIGURATION ERRORS
*********************************************************************************************************
*/
/*
******************************************************************************
* Function Name : des
* Description :
* Input :
* :
* Output : None
* Return : None
******************************************************************************
*/
static void des(u8 *plain_strng, u8 *key, u8 d, u8 *ciph_strng)
{
u8 a_str[8], b_str[8], x_str[8];
u8 i, j, *pkey, temp;
for (i = 0; i < 8 ; ++i)
{
if (key[i] != main_key[i])
{
compute_subkeys(key);
i = 7;
}
}
transpose(plain_strng, a_str, initial_tr, 64);
for (i=1; i < 17; ++i)
{
for (j=0; j < 8; ++j)
{
b_str[j] = a_str[j];
}
if (!d) /*enchipher*/
pkey = &sub_keys[i-1][0];
else /*dechipher*/
pkey = &sub_keys[16-i][0];
for (j=0; j < 4; ++j)
{
a_str[j] = b_str[j+4];
}
f(pkey, a_str, x_str);
for (j=0; j < 4; ++j)
{
a_str[j+4] = b_str[j] ^ x_str[j];
}
}
temp = a_str[0]; a_str[0] = a_str[4]; a_str[4] = temp;
temp = a_str[1]; a_str[1] = a_str[5]; a_str[5] = temp;
temp = a_str[2]; a_str[2] = a_str[6]; a_str[6] = temp;
temp = a_str[3]; a_str[3] = a_str[7]; a_str[7] = temp;
transpose(a_str, ciph_strng, final_tr, 64);
}
/*
******************************************************************************
* Function Name : transpose
* Description :
* Input :
* :
* Output : None
* Return : None
******************************************************************************
*/
static void transpose(u8 *idata, u8 *odata, uc8 *tbl, u8 n)
{
uc8 *tab_adr;
int i, bi_idx;
tab_adr = &bit_msk[0];
i = 0;
do
{
odata[i++] = 0;
}
while (i < 8);
i = 0;
do
{
bi_idx = *tbl++;
if (idata[bi_idx>>3] & tab_adr[bi_idx & 7])
{
odata[i>>3] |= tab_adr[i & 7];
}
}
while (++i < n);
}
/*
******************************************************************************
* Function Name : rotate_l
* Description :
* Input :
* :
* Output : None
* Return : None
******************************************************************************
*/
static void rotate_l(u8 *key)
{
u8 str_x[8];
u8 i;
for (i=0; i < 8; ++i)
str_x[i] = key[i];
for (i=0; i < 7; ++i)
{
key[i] = (key[i] << 1);
if ((i < 6) && ((str_x[i+1] & 128) == 128))
key[i] |= 1;
}
if (str_x[0] & 0x80 )
key[3] |= 0x10;
else
key[3] &= ~0x10;
if (str_x[3] & 0x08 )
key[6] |= 0x01;
else
key[6] &= ~0x01;
}
/*
******************************************************************************
* Function Name : compute_subkeys
* Description :
* Input :
* :
* Output : None
* Return : None
******************************************************************************
*/
static void compute_subkeys(u8 *key)
{
u8 i, j, ikey[8], okey[8];
for (i=0; i < 8; ++i)
{
main_key[i] = key[i];
}
transpose(key, ikey, key_tr1, 56);
for (i=0; i < 16; ++i)
{
for (j=0; j < rots[i]; ++j)
{
rotate_l(ikey);
}
transpose(ikey, okey, key_tr2, 64);
for (j=0; j < 8; ++j)
{
sub_keys[i][j] = okey[j];
}
}
}
/*
******************************************************************************
* Function Name : f
* Description :
* Input :
* :
* Output : None
* Return : None
******************************************************************************
*/
static void f(u8 *skey, u8 *a_str, u8 *x_str)
{
u8 e_str[8], y_str[8], z_str[8];
u8 k;
transpose(a_str, e_str, etr, 64);
for (k=0; k < 8; ++k)
{
y_str[k] = (e_str[k] ^ skey[k]) & 63;
z_str[k] = s[k] [y_str[k]];
}
transpose(z_str, x_str, ptr, 32);
}
/*
******************************************************************************
* Function Name : desEncrypt
* Description :
* Input :
* :
* Output : None
* Return : None
******************************************************************************
*/
static void desEncrypt(u8 *plain_strng, u8 *key, u8 *ciph_strng)
{
des(plain_strng,key,0, ciph_strng);
}
/*
******************************************************************************
* Function Name : desDecipher
* Description :
* Input :
* :
* Output : None
* Return : None
******************************************************************************
*/
static void desDecipher(u8 *plain_strng, u8 *key, u8 *ciph_strng)
{
des(plain_strng,key,1, ciph_strng);
}
/*
******************************************************************************
* Function Name : desEncryptPro
* Description : 加密函数
* Input :
* :
* Output : None
* Return : None
******************************************************************************
*/
s8 desEncryptPro(u8 *pSrc, u16 srcLen, u8 *pOut, u16 *outLen)
{
u8 loops=0,i=0;
if((srcLen != 0) && (srcLen % 8 == 0))
{
loops = srcLen / 8;
for(i=0; i<loops; i++)
{
desEncrypt((pSrc+i*8), (u8 *)DES_Encrypt_key, (pOut+i*8));
*outLen +=8;
}
return 0;
}
else
return -1;
}
/*
******************************************************************************
* Function Name : desEncryptPro
* Description : 解密函数
* Input :
* :
* Output : None
* Return : None
******************************************************************************
*/
s8 desDecipherPro(u8 *pSrc, u16 srcLen, u8 *pOut, u16 *outLen)
{
u8 loops=0,i=0;
if((srcLen != 0) && (srcLen % 8 == 0))
{
loops = srcLen / 8;
for(i=0; i<loops; i++)
{
desDecipher((pSrc+i*8), (u8 *)DES_Decrypt_key, (pOut+i*8));
*outLen +=8;
}
return 0;
}
else
return -1;
}
/*****************************************end*********************************************************/

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DES加密C语言代码

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