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分类: C/C++

2012-07-02 10:26:58

#include
#include
#include

//#define USESSL

#define MD5_HASH_SIZE 16

#ifdef USESSL
#include
#else

#define MD5_Init MD5Init
#define MD5_Update MD5Update
#define MD5_Final MD5Final
typedef unsigned long int UINT4;
typedef struct
{
UINT4 state[4]; /* state(ABCD) */
UINT4 count[2]; /* number of bits, modulo 2^64(lsb first) */
unsigned char buffer[64];
} MD5_CTX;

#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

static unsigned char PADDING[64] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

/* 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); \
}

/* Encodes input(UINT4) into output(unsigned char). Assumes len is a multiple of 4.*/
static void Encode(unsigned char *output, UINT4 *input, unsigned int len)
{
unsigned int i, j;
for(i = 0, j = 0; j < len; i++, j += 4)
{
output[j] =(unsigned char)(input[i] & 0xff);
output[j+1] =(unsigned char)((input[i] >> 8) & 0xff);
output[j+2] =(unsigned char)((input[i] >> 16) & 0xff);
output[j+3] =(unsigned char)((input[i] >> 24) & 0xff);
}
}
/* Decodes input(unsigned char) into output(UINT4). Assumes len is a multiple of 4.*/
static void Decode(UINT4 *output, unsigned char *input, unsigned int len)
{
unsigned int i, j;
for(i = 0, j = 0; j < len; i++, j += 4)
output[i] =((UINT4)input[j]) |(((UINT4)input[j+1]) << 8) |(((UINT4)input[j+2]) << 16) |(((UINT4)input[j+3]) << 24);
}
/* MD5 basic transformation. Transforms state based on block.*/
static void MD5Transform(UINT4 state[4], unsigned char block[64])
{
UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
Decode(x, block, 64);
/* Round 1 */
FF(a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
FF(d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
FF(c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
FF(b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
FF(a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
FF(d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
FF(c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
FF(b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
FF(a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
FF(d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

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

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

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

state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
memset(x, 0, sizeof(x));
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.*/
void MD5Init(MD5_CTX *context)
{
context->count[0] = context->count[1] = 0;
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputLen)
{
unsigned int i, index, partLen;
/* Compute number of bytes mod 64 */
index =(unsigned int)((context->count[0] >> 3) & 0x3F);
/* Update number of bits */
if((context->count[0] +=((UINT4)inputLen << 3)) <((UINT4)inputLen << 3))
context->count[1]++;
context->count[1] +=((UINT4)inputLen >> 29);
partLen = 64 - index;
/* Transform as many times as possible.*/
if(inputLen >= partLen)
{
memcpy(&context->buffer[index], input, partLen);
MD5Transform(context->state, context->buffer);
for(i = partLen; i + 63 < inputLen; i += 64)
MD5Transform(context->state, &input[i]);
index = 0;
}
else
i = 0;
/* Buffer remaining input */
memcpy(&context->buffer[index], &input[i], inputLen-i);
}

/* MD5 finalization. Ends an MD5 message-digest operation, writing the
   the message digest and zeroizing the context.
   */
void MD5Final(unsigned char digest[16], MD5_CTX *context)
{
unsigned char bits[8];
unsigned int index, padLen;
/* Save number of bits */
Encode(bits, context->count, 8);
/* Pad out to 56 mod 64.*/
index = (unsigned int)((context->count[0] >> 3) & 0x3f);
padLen = (index < 56) ? (56 - index) : (120 - index);
MD5Update(context, PADDING, padLen);
/* Append length(before padding) */
MD5Update(context, bits, 8);
/* Store state in digest */
Encode(digest, context->state, 16);
/* Zeroize sensitive information. */
memset(context, 0, sizeof(*context));
}
#endif

int chap_md5_verify_response(int id, char *name, unsigned char *secret, int secret_len, unsigned char *challenge, unsigned char *response)
{
MD5_CTX ctx;
unsigned char idbyte = id;
unsigned char hash[MD5_HASH_SIZE];
int challenge_len, response_len;

challenge_len = *challenge++;
response_len = *response++;
if(response_len == MD5_HASH_SIZE)
{
/* Generate hash of ID, secret, challenge */
MD5_Init(&ctx);
MD5_Update(&ctx, &idbyte, 1);
MD5_Update(&ctx, secret, secret_len);
MD5_Update(&ctx, challenge, challenge_len);
MD5_Final(hash, &ctx);

/* Test if our hash matches the peer's response */
if(memcmp(hash, response, MD5_HASH_SIZE) == 0)
{
return 1;
}
}
return 0;
}

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