md5加密算法C++程序

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

9 d/ {6 z @: G. _/ g" a/* Constants for MD5Transform routine.
*/
# u1 {" t- X2 z

: @7 I$ b/ T7 s* ?#define S11 7
& B' ?' |3 F7 p+ y. w" R#define S12 12
% q4 S- [* m, y# r3 m7 J#define S13 17
#define S14 22
+ a& C @4 w, `( [/ V7 D, b4 C# V#define S21 5
, y M* c/ {. N3 B# l#define S22 9
- r" r& n- [% O8 G#define S23 14
( F) Q4 M# B" u- t' g$ L3 }#define S24 20
; W* t" {* I( ~#define S31 4
#define S32 11
#define S33 16
#define S34 23
' J+ n, o* i4 u( T#define S41 6
#define S42 10
) I5 s$ I3 ~+ B: c/ m& q#define S43 15
0 x3 o& ?3 O! v" \' P, G/ T# u8 r#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
7 b9 S" i- c% e: b/ k1 T" sstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
; o/ I; Q' R h( Q- t* Jstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
2 ^2 t5 P$ {( x' n$ ?9 a% Sstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static 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
};
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9 ?( A4 l6 q) U/ h9 k& G/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
' m/ H3 t; a" ?#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
2 f7 \. d+ D2 J$ c#define I(x, y, z) ((y) ^ ((x) | (~z)))

+ D/ i& n! z: N. J/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

3 y# ?) H- |! x$ @4 u2 _/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
, D. X: S# N3 w# S& FRotation is separate from addition to prevent recomputation.
*/
; h2 L" b6 R+ ~$ ^#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); \
}
6 ?* o2 V' r" n" n' \#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.
*/
& ?% c j( i3 ]: e0 E0 hvoid MD5Init (context)
MD5_CTX *context; /* context */
8 b3 n/ u$ Q0 M' {& O+ F/ z1 P{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
3 ?7 I% r: y: b1 x. h}
, L4 J9 Z+ |' ^/ \- q
/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
' j2 c/ t, i; C% [+ w+ U4 Fvoid MD5Update (context, input, inputLen)
5 f: k, `2 r1 I. H5 P8 R. RMD5_CTX *context; /* context */
- ` W. k/ w$ [' I6 r* \: aunsigned char *input; /* input block */
; i) F8 g" c$ X- x9 cunsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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