md5加密算法C++程序

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#include "global.h"
#include "md5.h"

5 D8 }4 m, |* n0 Y, N/* Constants for MD5Transform routine.
*/

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4 X, ~* }/ c6 t, `+ ~6 D+ p& S: c+ Z#define S11 7
" }2 m0 J- Z* [( f7 U#define S12 12
" V2 K+ p& Y5 d( \: d#define S13 17
#define S14 22
^" L/ M0 b5 J" N" h& E" H#define S21 5
#define S22 9
4 Q0 I+ R+ X& E' z9 E7 [' M$ P#define S23 14
#define S24 20
#define S31 4
' S# ]# I& g1 P6 `! f) }: i, A( ]#define S32 11
#define S33 16
/ _3 R- g; z+ o/ T#define S34 23
#define S41 6
7 H; N& p% v& h0 g: a; n4 b2 C#define S42 10
+ l: c8 `1 D( M; w#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
: r- S+ z+ c3 |# p9 A+ ]% D! Sstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
0 ^) Q- \! b4 S+ w* estatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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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
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- u0 L( n% b+ g, e, i/* F, G, H and I are basic MD5 functions.
*/
' [$ @& ?' Z& [! v#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))
! O; r5 \* X% _4 i, M; z#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
; w1 f3 V$ b( T* Q$ \# h- O3 o#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

5 v8 u. U% d$ @7 P/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
E9 O& @6 o& G: }! LRotation 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); \
}
) G D) _7 t& K#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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
3 W0 g) I4 @/ c6 Evoid MD5Init (context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
0 _, `9 L8 W l0 C, U% J*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
1 @! H7 q1 y" o4 T}

" ^! ]/ E6 |; P9 ]/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
" ]# s' ~4 {: W) Vvoid MD5Update (context, input, inputLen)
% p4 T. O+ N& y! C1 aMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
* [! }: r$ A/ Z* x, j) c N{
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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