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单片机连接到internet中的ppp连接过程中的md5算法的c51程序


类别:技术文章
来源:未知
作者:未知
关键字:ppp连接
加入日期:2010-8-7

单片机连接到internet中的ppp连接过程中的md5算法的c51程序
/*中国电子网www.ec66.com*/
#include <stdio.h>

typedef unsigned char UChar;
typedef unsigned long int UINT4;
typedef unsigned int UINT2;

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21


/* F, G, H and I are basic MD5 functions. */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits. */

#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/***************************************************************************
FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
****************************************************************************/
#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}


typedef union
{
UINT4 Meg[16];
UChar Context[64];
} BUFFER;
typedef struct
{
UINT4 State[4];
BUFFER Buffer;
int Count;
} MD5_Conv;

MD5_Conv MD5;

void MD5Inital(MD5_Conv *MD5);
UINT2 MD5Input(UINT2 Index,UChar *Input,UINT2 Length);
/*UINT2 MD5LenComputed();*/
void MD5Package(UChar ID,UChar *Password,UINT2 PWLength,UChar *pChallenge);
void MD5Tran(UINT4 State[4],UINT4 Meg[16]);
void MD5_Encode(UChar ID,UChar * Password,UINT2 PWLength,UChar *pChallenge);

main()
{
UINT2 i,Length;
UChar *p;
UChar pw[]={"jbp1233"};
UChar Challenge[]=
{0x69,0x1c,0xdf,0x66,0xcd,0x2a,0x55,0x3d,0xbd,0x38,0xc,0x81,0x56,0x61,0xf6,0xa9}
;
UChar Resp_ID=0x4c;
Length=sizeof(pw)-1;
MD5_Encode(Resp_ID,pw,Length,Challenge);
p=(UChar*)MD5.State;
for(i=0;i<16;i++)
printf("% 02x ",*(p++));
}


void MD5Inital(MD5_Conv *MD5)
{
UINT2 i=0;
MD5->State[0]=0x67452301;
MD5->State[1]=0xefcdab89;
MD5->State[2]=0x98badcfe;
MD5->State[3]=0x10325476;
for(i=0;i<16;i++)MD5->Buffer.Meg[i]=0;
MD5->Count=0;
}

UINT2 MD5Input(UINT2 Index, UChar *Input, UINT2 Length)
{
UINT2 i=0;
for(i=0;i<Length;i++)
{MD5.Buffer.Context[Index++]=*Input++;}
return(Index);
}

/*UINT2 MD5LenComputed( UINT2 PWLength))
{
return(136+PWLength*8);
}*/
void MD5Package(UChar ID,UChar *Password,UINT2 PWLength,UChar *pChallenge)
{

UINT2 temp;
UINT2 Index=0,i;
temp=PWLength*8+136;
Index=MD5Input(Index,&ID,1);
Index=MD5Input(Index,Password,PWLength);
Index=MD5Input(Index,pChallenge,16);
MD5.Buffer.Context[Index++]=0x80;
for(i=Index;i<56;i++,Index++){ MD5.Buffer.Context[i]=0; }
MD5.Buffer.Context[Index++]=(UChar)temp;
MD5.Buffer.Context[Index++]=(UChar)(temp>>8);
for(i=Index;i<64;i++,Index++){ MD5.Buffer.Context[i]=0; }
Index=0;

}
void MD5Tran(UINT4 State[4],UINT4 Meg[16])
{ UINT4 a=State[0],b=State[1],c=State[2],d=State[3];

/* Round 1 */
FF (a, b, c, d, Meg[ 0], S11, 0xd76aa478); /* 1 */
FF (d, a, b, c, Meg[ 1], S12, 0xe8c7b756); /* 2 */
FF (c, d, a, b, Meg[ 2], S13, 0x242070db); /* 3 */
FF (b, c, d, a, Meg[ 3], S14, 0xc1bdceee); /* 4 */
FF (a, b, c, d, Meg[ 4], S11, 0xf57c0faf); /* 5 */
FF (d, a, b, c, Meg[ 5], S12, 0x4787c62a); /* 6 */
FF (c, d, a, b, Meg[ 6], S13, 0xa8304613); /* 7 */
FF (b, c, d, a, Meg[ 7], S14, 0xfd469501); /* 8 */
FF (a, b, c, d, Meg[ 8], S11, 0x698098d8); /* 9 */
FF (d, a, b, c, Meg[ 9], S12, 0x8b44f7af); /* 10 */
FF (c, d, a, b, Meg[10], S13, 0xffff5bb1); /* 11 */
FF (b, c, d, a, Meg[11], S14, 0x895cd7be); /* 12 */
FF (a, b, c, d, Meg[12], S11, 0x6b901122); /* 13 */
FF (d, a, b, c, Meg[13], S12, 0xfd987193); /* 14 */
FF (c, d, a, b, Meg[14], S13, 0xa679438e); /* 15 */
FF (b, c, d, a, Meg[15], S14, 0x49b40821); /* 16 */

/* Round 2 */
GG (a, b, c, d, Meg[ 1], S21, 0xf61e2562); /* 17 */
GG (d, a, b, c, Meg[ 6], S22, 0xc040b340); /* 18 */
GG (c, d, a, b, Meg[11], S23, 0x265e5a51); /* 19 */
GG (b, c, d, a, Meg[ 0], S24, 0xe9b6c7aa); /* 20 */
GG (a, b, c, d, Meg[ 5], S21, 0xd62f105d); /* 21 */
GG (d, a, b, c, Meg[10], S22, 0x2441453); /* 22 */
GG (c, d, a, b, Meg[15], S23, 0xd8a1e681); /* 23 */
GG (b, c, d, a, Meg[ 4], S24, 0xe7d3fbc8); /* 24 */
GG (a, b, c, d, Meg[ 9], S21, 0x21e1cde6); /* 25 */
GG (d, a, b, c, Meg[14], S22, 0xc33707d6); /* 26 */
GG (c, d, a, b, Meg[ 3], S23, 0xf4d50d87); /* 27 */
GG (b, c, d, a, Meg[ 8], S24, 0x455a14ed); /* 28 */
GG (a, b, c, d, Meg[13], S21, 0xa9e3e905); /* 29 */
GG (d, a, b, c, Meg[ 2], S22, 0xfcefa3f8); /* 30 */
GG (c, d, a, b, Meg[ 7], S23, 0x676f02d9); /* 31 */
GG (b, c, d, a, Meg[12], S24, 0x8d2a4c8a); /* 32 */

/* Round 3 */
HH (a, b, c, d, Meg[ 5], S31, 0xfffa3942); /* 33 */
HH (d, a, b, c, Meg[ 8], S32, 0x8771f681); /* 34 */
HH (c, d, a, b, Meg[11], S33, 0x6d9d6122); /* 35 */
HH (b, c, d, a, Meg[14], S34, 0xfde5380c); /* 36 */
HH (a, b, c, d, Meg[ 1], S31, 0xa4beea44); /* 37 */
HH (d, a, b, c, Meg[ 4], S32, 0x4bdecfa9); /* 38 */
HH (c, d, a, b, Meg[ 7], S33, 0xf6bb4b60); /* 39 */
HH (b, c, d, a, Meg[10], S34, 0xbebfbc70); /* 40 */
HH (a, b, c, d, Meg[13], S31, 0x289b7ec6); /* 41 */
HH (d, a, b, c, Meg[ 0], S32, 0xeaa127fa); /* 42 */
HH (c, d, a, b, Meg[ 3], S33, 0xd4ef3085); /* 43 */
HH (b, c, d, a, Meg[ 6], S34, 0x4881d05); /* 44 */
HH (a, b, c, d, Meg[ 9], S31, 0xd9d4d039); /* 45 */
HH (d, a, b, c, Meg[12], S32, 0xe6db99e5); /* 46 */
HH (c, d, a, b, Meg[15], S33, 0x1fa27cf8); /* 47 */
HH (b, c, d, a, Meg[ 2], S34, 0xc4ac5665); /* 48 */

/* Round 4 */
II (a, b, c, d, Meg[ 0], S41, 0xf4292244); /* 49 */
II (d, a, b, c, Meg[ 7], S42, 0x432aff97); /* 50 */
II (c, d, a, b, Meg[14], S43, 0xab9423a7); /* 51 */
II (b, c, d, a, Meg[ 5], S44, 0xfc93a039); /* 52 */
II (a, b, c, d, Meg[12], S41, 0x655b59c3); /* 53 */
II (d, a, b, c, Meg[ 3], S42, 0x8f0ccc92); /* 54 */
II (c, d, a, b, Meg[10], S43, 0xffeff47d); /* 55 */
II (b, c, d, a, Meg[ 1], S44, 0x85845dd1); /* 56 */
II (a, b, c, d, Meg[ 8], S41, 0x6fa87e4f); /* 57 */
II (d, a, b, c, Meg[15], S42, 0xfe2ce6e0); /* 58 */
II (c, d, a, b, Meg[ 6], S43, 0xa3014314); /* 59 */
II (b, c, d, a, Meg[13], S44, 0x4e0811a1); /* 60 */
II (a, b, c, d, Meg[ 4], S41, 0xf7537e82); /* 61 */
II (d, a, b, c, Meg[11], S42, 0xbd3af235); /* 62 */
II (c, d, a, b, Meg[ 2], S43, 0x2ad7d2bb); /* 63 */
II (b, c, d, a, Meg[ 9], S44, 0xeb86d391); /* 64 */

State[0] += a;
State[1] += b;
State[2] += c;
State[3] += d;

}

void MD5_Encode(UChar ID,UChar * Password,UINT2 PWLength,UChar *pChallenge)
{
MD5Inital(&MD5);
MD5Package(ID,Password,PWLength,pChallenge);
MD5Tran(MD5.State,MD5.Buffer.Meg);
}

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