md5.h
#include <stdlib.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
#endif
#define min(a,b) (((a)>(b))?(b):(a))
/* Vector Crays doesn't have a good 32-bit type, or more precisely,
int32_t as defined by <bind/bitypes.h> isn't 32 bits, and we don't
want to depend in being able to redefine this type. To cope with
this we have to clamp the result in some places to [0,2^32); no
need to do this on other machines. Did I say this was a mess?
*/
#ifdef _CRAY
#define CRAYFIX(X) ((X) & 0xffffffff)
#else
#define CRAYFIX(X) (X)
#endif
static inline u_int32_t
cshift (u_int32_t x, unsigned int n)
{
x = CRAYFIX(x);
return CRAYFIX((x << n) | (x >> (32 - n)));
}
struct md5 {
unsigned int sz[2];
int counter[4];
unsigned char save[64];
};
typedef struct md5 MD5_CTX;
void MD5_Init(struct md5 *m);
void MD5_Update(struct md5 *m, const void *p, size_t len);
void MD5_Final(void *res, struct md5 *m); /* u_int32_t res[4] */
#ifdef __cplusplus
} /* End of the 'extern "C"' block */
#endifmd5.c得整理
#include "md5.h"
#define A m->counter[0]
#define B m->counter[1]
#define C m->counter[2]
#define D m->counter[3]
#define X data
void MD5_Init (struct md5 *m)
{
m->sz[0] = 0;
m->sz[1] = 0;
D = 0x10325476;
C = 0x98badcfe;
B = 0xefcdab89;
A = 0x67452301;
}
#define F(x,y,z) CRAYFIX((x & y) | (~x & z))
#define G(x,y,z) CRAYFIX((x & z) | (y & ~z))
#define H(x,y,z) (x ^ y ^ z)
#define I(x,y,z) CRAYFIX(y ^ (x | ~z))
#define DOIT(a,b,c,d,k,s,i,OP) \
a = b + cshift(a + OP(b,c,d) + X[k] + (i), s)
#define DO1(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,F)
#define DO2(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,G)
#define DO3(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,H)
#define DO4(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,I)
static inline void calc (struct md5 *m, u_int32_t *data)
{
u_int32_t AA, BB, CC, DD;
AA = A;
BB = B;
CC = C;
DD = D;
/* Round 1 */
DO1(A,B,C,D,0,7,0xd76aa478);
DO1(D,A,B,C,1,12,0xe8c7b756);
DO1(C,D,A,B,2,17,0x242070db);
DO1(B,C,D,A,3,22,0xc1bdceee);
DO1(A,B,C,D,4,7,0xf57c0faf);
DO1(D,A,B,C,5,12,0x4787c62a);
DO1(C,D,A,B,6,17,0xa8304613);
DO1(B,C,D,A,7,22,0xfd469501);
DO1(A,B,C,D,8,7,0x698098d8);
DO1(D,A,B,C,9,12,0x8b44f7af);
DO1(C,D,A,B,10,17,0xffff5bb1);
DO1(B,C,D,A,11,22,0x895cd7be);
DO1(A,B,C,D,12,7,0x6b901122);
DO1(D,A,B,C,13,12,0xfd987193);
DO1(C,D,A,B,14,17,0xa679438e);
DO1(B,C,D,A,15,22,0x49b40821);
/* Round 2 */
DO2(A,B,C,D,1,5,0xf61e2562);
DO2(D,A,B,C,6,9,0xc040b340);
DO2(C,D,A,B,11,14,0x265e5a51);
DO2(B,C,D,A,0,20,0xe9b6c7aa);
DO2(A,B,C,D,5,5,0xd62f105d);
DO2(D,A,B,C,10,9,0x2441453);
DO2(C,D,A,B,15,14,0xd8a1e681);
DO2(B,C,D,A,4,20,0xe7d3fbc8);
DO2(A,B,C,D,9,5,0x21e1cde6);
DO2(D,A,B,C,14,9,0xc33707d6);
DO2(C,D,A,B,3,14,0xf4d50d87);
DO2(B,C,D,A,8,20,0x455a14ed);
DO2(A,B,C,D,13,5,0xa9e3e905);
DO2(D,A,B,C,2,9,0xfcefa3f8);
DO2(C,D,A,B,7,14,0x676f02d9);
DO2(B,C,D,A,12,20,0x8d2a4c8a);
/* Round 3 */
DO3(A,B,C,D,5,4,0xfffa3942);
DO3(D,A,B,C,8,11,0x8771f681);
DO3(C,D,A,B,11,16,0x6d9d6122);
DO3(B,C,D,A,14,23,0xfde5380c);
DO3(A,B,C,D,1,4,0xa4beea44);
DO3(D,A,B,C,4,11,0x4bdecfa9);
DO3(C,D,A,B,7,16,0xf6bb4b60);
DO3(B,C,D,A,10,23,0xbebfbc70);
DO3(A,B,C,D,13,4,0x289b7ec6);
DO3(D,A,B,C,0,11,0xeaa127fa);
DO3(C,D,A,B,3,16,0xd4ef3085);
DO3(B,C,D,A,6,23,0x4881d05);
DO3(A,B,C,D,9,4,0xd9d4d039);
DO3(D,A,B,C,12,11,0xe6db99e5);
DO3(C,D,A,B,15,16,0x1fa27cf8);
DO3(B,C,D,A,2,23,0xc4ac5665);
/* Round 4 */
DO4(A,B,C,D,0,6,0xf4292244);
DO4(D,A,B,C,7,10,0x432aff97);
DO4(C,D,A,B,14,15,0xab9423a7);
DO4(B,C,D,A,5,21,0xfc93a039);
DO4(A,B,C,D,12,6,0x655b59c3);
DO4(D,A,B,C,3,10,0x8f0ccc92);
DO4(C,D,A,B,10,15,0xffeff47d);
DO4(B,C,D,A,1,21,0x85845dd1);
DO4(A,B,C,D,8,6,0x6fa87e4f);
DO4(D,A,B,C,15,10,0xfe2ce6e0);
DO4(C,D,A,B,6,15,0xa3014314);
DO4(B,C,D,A,13,21,0x4e0811a1);
DO4(A,B,C,D,4,6,0xf7537e82);
DO4(D,A,B,C,11,10,0xbd3af235);
DO4(C,D,A,B,2,15,0x2ad7d2bb);
DO4(B,C,D,A,9,21,0xeb86d391);
A += AA;
B += BB;
C += CC;
D += DD;
}
/*
* From `Performance analysis of MD5' by Joseph D. Touch <[email protected]>
*/
#if !defined(__BYTE_ORDER) || !defined (__BIG_ENDIAN)
#error __BYTE_ORDER macros not defined
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
static inline u_int32_t
swap_u_int32_t (u_int32_t t)
{
u_int32_t temp1, temp2;
temp1 = cshift(t, 16);
temp2 = temp1 >> 8;
temp1 &= 0x00ff00ff;
temp2 &= 0x00ff00ff;
temp1 <<= 8;
return temp1 | temp2;
}
#endif
struct x32{
unsigned int a:32;
unsigned int b:32;
};
void MD5_Update (struct md5 *m, const void *v, size_t len)
{
const unsigned char *p = v;
size_t old_sz = m->sz[0];
size_t offset;
m->sz[0] += len * 8;
if (m->sz[0] < old_sz)
++m->sz[1];
offset = (old_sz / 8) % 64;
while(len > 0){
size_t l = min(len, 64 - offset);
memcpy(m->save + offset, p, l);
offset += l;
p += l;
len -= l;
if(offset == 64){
#if __BYTE_ORDER == __BIG_ENDIAN
int i;
u_int32_t current[16];
struct x32 *u = (struct x32*)m->save;
for(i = 0; i < 8; i++){
current[2*i+0] = swap_u_int32_t(u[i].a);
current[2*i+1] = swap_u_int32_t(u[i].b);
}
calc(m, current);
#else
calc(m, (u_int32_t*)m->save);
#endif
offset = 0;
}
}
}
void MD5_Final (void *res, struct md5 *m)
{
unsigned char zeros[72];
unsigned offset = (m->sz[0] / 8) % 64;
unsigned int dstart = (120 - offset - 1) % 64 + 1;
*zeros = 0x80;
memset (zeros + 1, 0, sizeof(zeros) - 1);
zeros[dstart+0] = (m->sz[0] >> 0) & 0xff;
zeros[dstart+1] = (m->sz[0] >> 8) & 0xff;
zeros[dstart+2] = (m->sz[0] >> 16) & 0xff;
zeros[dstart+3] = (m->sz[0] >> 24) & 0xff;
zeros[dstart+4] = (m->sz[1] >> 0) & 0xff;
zeros[dstart+5] = (m->sz[1] >> 8) & 0xff;
zeros[dstart+6] = (m->sz[1] >> 16) & 0xff;
zeros[dstart+7] = (m->sz[1] >> 24) & 0xff;
MD5_Update (m, zeros, dstart + 8);
{
int i;
unsigned char *r = (unsigned char *)res;
for (i = 0; i < 4; ++i) {
r[4*i] = m->counter[i] & 0xFF;
r[4*i+1] = (m->counter[i] >> 8) & 0xFF;
r[4*i+2] = (m->counter[i] >> 16) & 0xFF;
r[4*i+3] = (m->counter[i] >> 24) & 0xFF;
}
}
#if 0
{
int i;
u_int32_t *r = (u_int32_t *)res;
for (i = 0; i < 4; ++i)
r[i] = swap_u_int32_t (m->counter[i]);
}
#endif
}