md5加密算法C++程序

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#include "global.h"
; P4 y! t; V2 ?8 V. k" E#include "md5.h"
# C6 i8 t* \( G5 @) ~) N
' z1 t' K7 j2 \9 o! Z% H, T3 X3 n6 h/* Constants for MD5Transform routine.
*/

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1 _ c9 F o6 i9 r" P* t#define S11 7
#define S12 12
! R7 y* W& z9 F#define S13 17
" n& @5 O8 ? a#define S14 22
6 g6 m4 h1 R6 w4 E: T#define S21 5
#define S22 9
#define S23 14
0 s: p# b2 {- q1 L, U#define S24 20
#define S31 4
#define S32 11
#define S33 16
7 d# g) W/ _2 u4 Q8 A#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

6 _7 N" o+ W6 ostatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
/ E4 @! N: d+ Xstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
& J/ M y& J+ a. k3 P# Jstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

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
- C. w/ C7 u7 q9 F! s" Y" s; B1 p& V};

/* 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.
*/
+ g; q, u: {0 j7 U; ~* r#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

6 i3 y k/ O. \$ | Y$ V A/ F- M/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
; k9 p6 |# Y1 M2 b$ e' K' h#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
* H4 d- w6 U6 d#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); \
}

2 q0 P! }/ [" k/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
" H# \% L* {; |3 k& }void MD5Init (context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
: Q$ F! \+ V3 F. O* U I*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
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" }: n: r2 j9 P2 }0 j# Y9 s1 y/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
) Y8 s1 a6 W1 D8 Y- r5 F* jvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
9 @+ z2 q1 s) P! @unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
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/* 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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