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#include "global.h"
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#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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#define S11 7
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#define S12 12
! e) m" }/ O8 K! x! b#define S13 17
9 h! T2 H6 z1 X, Z7 h s#define S14 22
6 z$ }6 i& z$ E t& f( d- r* `( c#define S21 5
5 y1 H* u- b# f. K% P* @! R#define S22 9
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#define S23 14
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#define S24 20
. p5 a2 V. i2 H$ ^7 |) ^# i! G#define S31 4
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#define S32 11
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#define S33 16
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#define S34 23
, K1 n0 y5 r( T#define S41 6
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#define S42 10
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#define S43 15
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#define S44 21
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% `# ?2 g( c; P4 R# j Hstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
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static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
( R/ T& ~" N' G1 a% y0 `; A! D" Gstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
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static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
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static 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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};
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/* F, G, H and I are basic MD5 functions.
*/
% g: f! l0 e- t Y- e1 }#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
# D- y2 t3 U, `- i8 m6 D" b#define H(x, y, z) ((x) ^ (y) ^ (z))
" b/ G+ x" j% c+ L( D. X#define I(x, y, z) ((y) ^ ((x) | (~z)))
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7 L A# {: L {3 {+ G/* ROTATE_LEFT rotates x left n bits.
*/
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#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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Rotation is separate from addition to prevent recomputation.
*/
9 k1 r2 k( _, b+ v/ O$ a#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
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#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
1 B1 ~7 y: }& j! P8 B3 _- x% @#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
& r. d4 B# n# i) u#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
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/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
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void MD5Init (context)
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MD5_CTX *context; /* context */
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{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
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*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
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$ N* J% B+ m0 V3 X/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
3 R5 }8 B1 ]. R/ Lvoid MD5Update (context, input, inputLen)
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MD5_CTX *context; /* context */
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unsigned char *input; /* input block */
6 x8 U5 X ^ f7 _- Q0 {6 eunsigned int inputLen; /* length of input block */
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unsigned int i, index, partLen;
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/* 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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发表于 2004-11-26 20:11:20
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