md5加密算法C++程序

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#include "global.h"
6 J$ j3 A% C3 W5 f" {, E#include "md5.h"

/* Constants for MD5Transform routine.
*/

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#define S11 7
% B3 f" _' s2 S+ ~' x: p z#define S12 12
9 K# `! O% }7 Q/ d' O7 Y8 u#define S13 17
#define S14 22
7 B( ~2 n) w+ F2 C4 @* m- U1 K#define S21 5
9 V, ?2 F* S" _- F& p0 }/ O# ^' a7 `#define S22 9
! s1 E: U" J) \) ^/ c3 J/ T" e#define S23 14
#define S24 20
#define S31 4
7 w' U4 q8 \$ y p( T8 f#define S32 11
#define S33 16
#define S34 23
9 c. R% r1 m3 ?1 n6 `2 x! m4 l#define S41 6
6 `- y$ i2 F* E/ Y# V8 u2 x$ @+ V#define S42 10
. R+ {* g! {/ B$ q V#define S43 15
#define S44 21

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));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
, A( J" E- W# e2 d/ Astatic 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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/* 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)))
7 A) E+ U7 Q1 B6 x0 g+ P- D" r#define H(x, y, z) ((x) ^ (y) ^ (z))
7 n/ G1 b. k5 T- i* Z/ d) A8 r#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
2 N! W K, G, N4 ?1 F% j#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

0 B5 _* c* C& k/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
% |$ E9 k$ ^; t( s7 VRotation is separate from addition to prevent recomputation.
*/
. ]6 ]& _4 o$ S2 R K% J" B#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); \
}
7 h) I" U' W) i* u8 f* Q#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
( V' u& q8 G: @( e. q, ?#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

$ O3 s, h8 q- h- K/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
" J7 S, p( U% x& u" ?6 F& B& Ovoid MD5Init (context)
MD5_CTX *context; /* context */
{
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.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
6 B- o3 o+ s* U' D+ D/ eunsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
" Q8 @4 r% o/ [$ n8 Z{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
# }. H `$ Q% v4 q; f
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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