md5加密算法C++程序

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#include "global.h"
7 V Z7 Y' k; o6 r7 }#include "md5.h"

+ \# x+ c# K* A- V/* Constants for MD5Transform routine.
*/


: Y, k$ {# G8 @# g0 H/ v' C#define S11 7
#define S12 12
# r5 l9 G+ Z! n' Q#define S13 17
+ l9 F+ d3 l$ {5 e r#define S14 22
#define S21 5
#define S22 9
#define S23 14
! i& X2 Z$ `0 B" ~6 a0 {: ?: Y#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 void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
7 @8 }1 e, J6 X: istatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
3 T+ ^' d' u& g- X% w6 Y0 C, T6 N/ `static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
6 q0 p) Z$ r; R( h; zstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
# T. ~; M5 v/ x w
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.
*/
# L- t- M6 z0 M#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
# _9 ~7 d( O/ h4 c2 g# a. Z#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
1 |' m: i2 V5 O& y#define H(x, y, z) ((x) ^ (y) ^ (z))
6 p# }1 {3 Q6 U. @ f/ e6 A#define I(x, y, z) ((y) ^ ((x) | (~z)))

* y' z, Z$ E) J' k8 n/* ROTATE_LEFT rotates x left n bits.
*/
9 i$ q+ k8 S6 I9 x- p- ^5 g#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
5 e9 {+ C" Y2 P6 v, `
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
8 Y1 r2 n# o1 p! S& l2 D7 m' ^* j#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
. [+ ]4 Y4 z& \1 O3 a9 m' V#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); \
}
% a6 D) W' \: S5 V#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
* I8 r9 `9 ]5 Q1 @& Y. o9 F; q# E
/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
% ?: W, G2 E+ R3 h( lMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
: A: g& E5 Y' K* s*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
8 T% @8 O" _% R! B
/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
% u+ o' h2 }- @/ x5 Ounsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
9 A7 h# l- ]5 C' X- E, @. v
/* 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))
&

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