md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/


# C6 r3 z( S2 B8 n* e#define S11 7
- w; n h, o% N0 G9 N6 z. R#define S12 12
#define S13 17
! e( u" ]$ k" g7 y#define S14 22
#define S21 5
#define S22 9
#define S23 14
% x K! t5 T& `2 Y#define S24 20
# l3 L, e8 ?3 X# r) K#define S31 4
s, o+ q2 n: R6 B& c; T; G#define S32 11
#define S33 16
#define S34 23
( l- Z9 V# P. \: a% b; L#define S41 6
3 r& P3 U) z* j2 I% x#define S42 10
3 o% j3 ]* P" p+ l. ?#define S43 15
#define S44 21
@) d5 s3 Y- S- X- {7 }) d
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
+ j0 m1 d0 ], V7 ^static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
& f0 F# k9 \+ w6 Q ?static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
* G/ B, ^- H- t4 \9 r+ zstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

, l, o& U4 l8 y9 L/ lstatic 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
};
( c4 t" h& R: m/ v& L- O
( A$ @/ d) z" \0 U, z, j6 z/* F, G, H and I are basic MD5 functions.
*/
' m; S1 y* o% I3 N1 Y#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
; v* n) H2 D( `# r8 r; S#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
7 Z5 w( h3 u, |: i#define H(x, y, z) ((x) ^ (y) ^ (z))
# |% E1 ^, ?! c( P" {& J7 V. s2 F! O#define I(x, y, z) ((y) ^ ((x) | (~z)))
( f" j2 c) X6 s, |0 S
7 p3 I/ ?% r8 n5 X* l, G/* ROTATE_LEFT rotates x left n bits.
*/
* T; _" O' p- o5 E#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
/ Y! K, v# ]! Z# i5 y
/ c6 C* a N d8 Z! L+ C8 }# M/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
% f7 h% p2 _7 W R3 V2 P: b3 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); \
}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
. f% {( w5 h2 ]$ u#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
# |1 B' a- U! B0 p#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

u" n) h+ Y$ x7 D/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
% r, k: i0 D2 _void MD5Init (context)
MD5_CTX *context; /* context */
4 ^& x6 G* j4 I{
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;
}
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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
, Y) o6 z. j$ S* a5 Mvoid MD5Update (context, input, inputLen)
1 L/ e- d# F* {* VMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
) N2 B: k; u. i) f2 N{
unsigned int i, index, partLen;
# \3 ^# o& O& Z# [. K" t
/* 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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