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[网页特效]MD5算法在JS中的实现

龙少

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闲云野龙

爱心天使

楼主大中小发表于 2005-11-8 11:18 AM 只看该作者

[网页特效]MD5算法在JS中的实现

/* to convert strings to a list of ascii values */www.ala365.com/ }/ \! _1 D* s! n  W: f
var sAscii =  !\#$%&'()*+,-./0123456789:;?@ABCDEFGHIJKLMNOPQRSTUVWXYZ
var sAscii = sAscii + [\\]^_`abcdefghijklmnopqrstuvwxyz{|}~;www.ala365.com, }, a/ O2 h9 ~  z
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/* convert integer to hex string */
var sHex = 0123456789ABCDEF;
function hex(i)
{上海365论坛: e# V! Q/ w! R( Z  D( o7 q6 a
h = ;
for(j = 0; j > (j * 8 + 4)) & 0x0F) +上海365论坛+ N8 G/ a) x* A* o/ \* e2 _
sHex.charAt((i >> (j * 8)) & 0x0F);www.ala365.com" H% e! G' ~8 ]: ]$ Q" S
}
return h;上海365论坛－ bbs.ala365.com1 Y' R! G* g8 F, C
}上海365论坛－ bbs.ala365.com6 T; M: X6 {$ U; x2 P; I
上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs5 d' Q$ z7 P' J8 e. a( |- T& v5 @
/* add, handling overflows correctly */
function add(x, y)上海365论坛－ bbs.ala365.com2 v; |5 b& _! g4 J8 _. n0 P) T9 X0 t
{
return ((x&0x7FFFFFFF) + (y&0x7FFFFFFF)) ^ (x&0x80000000) ^ (y&0x80000000);
}上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs$ v) z$ ?. w" H& M, H  B- ]: `
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/* MD5 rounds functions */
function R1(A, B, C, D, X, S, T)
{
q = add(add(A, (B & C) | (~B & D)), add(X, T));
return add((q > (32 - S)) & (Math.pow(2, S) - 1)), B);上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs1 s% p& K2 l) o& ?; V( R/ o
}
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function R2(A, B, C, D, X, S, T)
{
q = add(add(A, (B & D) | (C & ~D)), add(X, T));
return add((q > (32 - S)) & (Math.pow(2, S) - 1)), B);上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs: u- {0 i+ }2 x) V0 U) ^; X8 L# t
}上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs. @+ H$ ^( h+ Z
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function R3(A, B, C, D, X, S, T) - 我爱上海每一天2 J1 I$ [& |6 Z
{$ i% y# Q# s0 T  O9 _- S
q = add(add(A, B ^ C ^ D), add(X, T));% |% s2 n9 x( `9 q/ I. }+ z) p
return add((q > (32 - S)) & (Math.pow(2, S) - 1)), B);上海365论坛0 _* y$ y8 q+ L# ]9 G/ W
}上海365论坛' q- u; o9 [- b& |* e, o
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function R4(A, B, C, D, X, S, T)% B# L5 [$ m9 b+ q
{
q = add(add(A, C ^ (B | ~D)), add(X, T));上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs1 e8 D; c" d0 P; s& y0 T
return add((q > (32 - S)) & (Math.pow(2, S) - 1)), B);上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs1 }7 V+ o' q  Z0 u0 ~4 {9 H" r
}
上海365论坛－ bbs.ala365.com. q' T+ ^; b% F0 r( V
/* main entry point */ - 我爱上海每一天* j  F) s5 u$ s. a! R. J" v
function calcMD5(sInp) {上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs5 r$ B( h7 q6 @$ n
上海365论坛－ bbs.ala365.com3 T* P7 p3 i! ~/ Q) {$ X
/* Calculate length in machine words, including padding */
wLen = (((sInp.length + 8) >> 6) + 1) www.ala365.com& P$ @# U- Q) P' J8 Z& c

/* Convert string to array of words */上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs" E- F. j+ Z- r* a2 \/ T' v) D; M  Z  d
j = 4;
for (i = 0; (i * 4) 上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs7 K! P9 B% Z: _; r* E7 a
www.ala365.com2 h3 t7 x$ U& j0 k
/* Append padding bits and length */上海365论坛1 g. P  g( G1 Y5 }0 s0 ^( Z7 y' D
if (j == 4)
{上海365论坛－ bbs.ala365.com# |4 ~3 ]! }9 @, @" L
X[i++] = 0x80;
}上海365论坛! m1 P. B- Q# e" q
else- i. a. }* x  W- v. ~( b
{
X[i - 1] += 0x80 上海365论坛3 v/ R( Y% H8 o6 @8 E9 e; e* L+ l

/* hard-coded initial values */
a = 0x67452301; - 我爱上海每一天7 [) L3 U  {/ g  e
b = 0xefcdab89;上海365论坛& `2 B9 Z  e+ V) I' i- ]9 ]
c = 0x98badcfe;www.ala365.com7 Y) @3 {/ n7 }) B3 \
d = 0x10325476;上海365论坛－ bbs.ala365.com* c& h, V, O# P' t2 Y

/* Process each 16-word block in turn */
for (i = 0; i - 我爱上海每一天( G- ^& L! B; H3 C. I
- 我爱上海每一天+ M' A" ^) x- {) q. V- I
a = R1(a, b, c, d, X[i+ 0], 7 , 0xd76aa478);
d = R1(d, a, b, c, X[i+ 1], 12, 0xe8c7b756);+ c1 k# I0 M, u3 x" I7 ^) s; U
c = R1(c, d, a, b, X[i+ 2], 17, 0x242070db);www.ala365.com! W. o, o" H. f+ i" C  q: N
b = R1(b, c, d, a, X[i+ 3], 22, 0xc1bdceee);
a = R1(a, b, c, d, X[i+ 4], 7 , 0xf57c0faf);
d = R1(d, a, b, c, X[i+ 5], 12, 0x4787c62a);上海365论坛3 ^- A4 S3 ]0 }
c = R1(c, d, a, b, X[i+ 6], 17, 0xa8304613); - 我爱上海每一天: g/ p  {) q; k
b = R1(b, c, d, a, X[i+ 7], 22, 0xfd469501);
a = R1(a, b, c, d, X[i+ 8], 7 , 0x698098d8);
d = R1(d, a, b, c, X[i+ 9], 12, 0x8b44f7af);上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs, E) x: P7 Y) d4 A  L
c = R1(c, d, a, b, X[i+10], 17, 0xffff5bb1);
b = R1(b, c, d, a, X[i+11], 22, 0x895cd7be);
a = R1(a, b, c, d, X[i+12], 7 , 0x6b901122);
d = R1(d, a, b, c, X[i+13], 12, 0xfd987193);
c = R1(c, d, a, b, X[i+14], 17, 0xa679438e);3 ?! Q$ C) k8 m: l4 }% N* H- \0 m
b = R1(b, c, d, a, X[i+15], 22, 0x49b40821);www.ala365.com& y" F$ _+ |. i+ c% ]

a = R2(a, b, c, d, X[i+ 1], 5 , 0xf61e2562);上海365论坛－ bbs.ala365.com/ I* i5 _2 F, `, B* u3 ~# b
d = R2(d, a, b, c, X[i+ 6], 9 , 0xc040b340);
c = R2(c, d, a, b, X[i+11], 14, 0x265e5a51);
b = R2(b, c, d, a, X[i+ 0], 20, 0xe9b6c7aa);www.ala365.com& o, H0 }. Y: ?# j2 W6 A& A
a = R2(a, b, c, d, X[i+ 5], 5 , 0xd62f105d);上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs0 U4 [& |& P) ?3 }5 E! K0 Y5 D
d = R2(d, a, b, c, X[i+10], 9 , 0x2441453);www.ala365.com! P  L& w( n4 w
c = R2(c, d, a, b, X[i+15], 14, 0xd8a1e681);上海365论坛+ ]/ R0 o" k$ J# h
b = R2(b, c, d, a, X[i+ 4], 20, 0xe7d3fbc8);www.ala365.com1 \& l- d& n7 E1 e) h
a = R2(a, b, c, d, X[i+ 9], 5 , 0x21e1cde6);
d = R2(d, a, b, c, X[i+14], 9 , 0xc33707d6);上海365论坛( ^4 m4 X/ o9 E: l$ n2 U
c = R2(c, d, a, b, X[i+ 3], 14, 0xf4d50d87);
b = R2(b, c, d, a, X[i+ 8], 20, 0x455a14ed);
a = R2(a, b, c, d, X[i+13], 5 , 0xa9e3e905);
d = R2(d, a, b, c, X[i+ 2], 9 , 0xfcefa3f8); - 我爱上海每一天3 p! v3 ]9 N+ M: x  x8 E
c = R2(c, d, a, b, X[i+ 7], 14, 0x676f02d9);+ u; G4 ^' Y0 |, s! q! y8 D
b = R2(b, c, d, a, X[i+12], 20, 0x8d2a4c8a);
- 我爱上海每一天+ H0 |; A- V4 {4 D, A
a = R3(a, b, c, d, X[i+ 5], 4 , 0xfffa3942);
d = R3(d, a, b, c, X[i+ 8], 11, 0x8771f681);
c = R3(c, d, a, b, X[i+11], 16, 0x6d9d6122);
b = R3(b, c, d, a, X[i+14], 23, 0xfde5380c);
a = R3(a, b, c, d, X[i+ 1], 4 , 0xa4beea44);
d = R3(d, a, b, c, X[i+ 4], 11, 0x4bdecfa9);上海365论坛# o1 x# W* R! N4 g6 z* G) w8 R2 ]
c = R3(c, d, a, b, X[i+ 7], 16, 0xf6bb4b60);
b = R3(b, c, d, a, X[i+10], 23, 0xbebfbc70);
a = R3(a, b, c, d, X[i+13], 4 , 0x289b7ec6);上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs9 g& E" W- r% W  q
d = R3(d, a, b, c, X[i+ 0], 11, 0xeaa127fa);上海365论坛0 q9 p( d6 e& m: H6 O1 A
c = R3(c, d, a, b, X[i+ 3], 16, 0xd4ef3085);
b = R3(b, c, d, a, X[i+ 6], 23, 0x4881d05);上海365论坛5 k" J" E1 e8 L" z7 F
a = R3(a, b, c, d, X[i+ 9], 4 , 0xd9d4d039);
d = R3(d, a, b, c, X[i+12], 11, 0xe6db99e5);上海365论坛－ bbs.ala365.com$ W% J4 Z  x' j% p. H! N$ X
c = R3(c, d, a, b, X[i+15], 16, 0x1fa27cf8);
b = R3(b, c, d, a, X[i+ 2], 23, 0xc4ac5665);
- 我爱上海每一天0 ?4 P, ?0 M- O- K4 v0 J# ^+ O" Q# c
a = R4(a, b, c, d, X[i+ 0], 6 , 0xf4292244);上海365论坛－ bbs.ala365.com0 T$ B7 A$ K4 f. ^9 U2 w
d = R4(d, a, b, c, X[i+ 7], 10, 0x432aff97);上海365论坛－ bbs.ala365.com  e8 p! _3 Z# r+ Q$ [& f- i
c = R4(c, d, a, b, X[i+14], 15, 0xab9423a7);
b = R4(b, c, d, a, X[i+ 5], 21, 0xfc93a039); - 我爱上海每一天3 U. n  y9 L5 w* e: ?; X! m
a = R4(a, b, c, d, X[i+12], 6 , 0x655b59c3);上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs% x3 n7 S; z* l
d = R4(d, a, b, c, X[i+ 3], 10, 0x8f0ccc92);上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs: O* @9 i- x5 ?$ s2 n
c = R4(c, d, a, b, X[i+10], 15, 0xffeff47d);
b = R4(b, c, d, a, X[i+ 1], 21, 0x85845dd1);上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs9 `3 v. Y3 f! s1 \0 }5 s$ U
a = R4(a, b, c, d, X[i+ 8], 6 , 0x6fa87e4f);
d = R4(d, a, b, c, X[i+15], 10, 0xfe2ce6e0);
c = R4(c, d, a, b, X[i+ 6], 15, 0xa3014314);
b = R4(b, c, d, a, X[i+13], 21, 0x4e0811a1);
a = R4(a, b, c, d, X[i+ 4], 6 , 0xf7537e82); - 我爱上海每一天% g4 Q% F# o4 G& ^$ {
d = R4(d, a, b, c, X[i+11], 10, 0xbd3af235);
c = R4(c, d, a, b, X[i+ 2], 15, 0x2ad7d2bb);
b = R4(b, c, d, a, X[i+ 9], 21, 0xeb86d391);

a = add(a, aO);
b = add(b, bO);上海365论坛－ bbs.ala365.com8 c3 l. g. j$ Z( q3 h
c = add(c, cO);
d = add(d, dO);上海365论坛6 c8 z/ M. a6 U6 V( T, i9 Q
}
return hex(a) + hex(b) + hex(c) + hex(d);
}

alert(hex(123456))上海论坛,上海人论坛,上海时尚,上海美食,上海地图,shanghai bbs( o! w# {+ Z7 \: m+ o
//-->上海365论坛－ bbs.ala365.com8 d' J, n/ B) T8 W3 {' c
上海365论坛! _$ {, A# K  I
上海365论坛－ bbs.ala365.com5 M$ \8 p* ?; T# s- u

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