Javascript的MD5函数

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转载最新推荐文章于 2025-07-18 09:17:33 发布 · 207 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/smartstone/archive/2009/03/06/1404988.html

文章标签：

#javascript #ViewUI

本文详细介绍了使用JavaScript实现MD5加密算法的过程。该算法通过一系列复杂的位操作和数学运算来生成固定长度的摘要，用于确保数据完整性和安全性。具体步骤包括位移、加法、逻辑运算等，并分为四个阶段进行迭代处理。

Code
1

function MD5(strPassword)

{
2

function RotateLeft(lValue, iShiftBits)

{ return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits)); }
3

function AddUnsigned(lX,lY)

{
4

var lX4,lY4,lX8,lY8,lResult;
5

lX8 = (lX & 0x80000000);
6

lY8 = (lY & 0x80000000);
7

lX4 = (lX & 0x40000000);
8

lY4 = (lY & 0x40000000);
9

lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF);
10

if (lX4 & lY4) return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
11

if (lX4 | lY4)

{
12

if (lResult & 0x40000000) return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
13

else return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
14

} else return (lResult ^ lX8 ^ lY8);
15

}
16

function F(x,y,z)

{ return (x & y) | ((~x) & z); }
17

function G(x,y,z)

{ return (x & z) | (y & (~z)); }
18

function H(x,y,z)

{ return (x ^ y ^ z); }
19

function I(x,y,z)

{ return (y ^ (x | (~z))); }
20

function FF(a,b,c,d,x,s,ac)

{
21

a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
22

return AddUnsigned(RotateLeft(a, s), b);
23

}
24

function GG(a,b,c,d,x,s,ac)

{
25

a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
26

return AddUnsigned(RotateLeft(a, s), b);
27

}
28

function HH(a,b,c,d,x,s,ac)

{
29

a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
30

return AddUnsigned(RotateLeft(a, s), b);
31

}
32

function II(a,b,c,d,x,s,ac)

{
33

a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
34

return AddUnsigned(RotateLeft(a, s), b);
35

}
36

function ConvertToWordArray(strPassword)

{
37

var lWordCount;
38

var lMessageLength = strPassword.length;
39

var lNumberOfWords_temp1=lMessageLength + 8;
40

var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64;
41

var lNumberOfWords = (lNumberOfWords_temp2+1)*16;
42

var lWordArray=Array(lNumberOfWords-1);
43

var lBytePosition = 0;
44

var lByteCount = 0;
45

while ( lByteCount < lMessageLength )

{
46

lWordCount = (lByteCount-(lByteCount % 4))/4;
47

lBytePosition = (lByteCount % 4)*8;
48

lWordArray[lWordCount] = (lWordArray[lWordCount] | (strPassword.charCodeAt(lByteCount)<<lBytePosition));
49

lByteCount++;
50

}
51

lWordCount = (lByteCount-(lByteCount % 4))/4;
52

lBytePosition = (lByteCount % 4)*8;
53

lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition);
54

lWordArray[lNumberOfWords-2] = lMessageLength<<3;
55

lWordArray[lNumberOfWords-1] = lMessageLength>>>29;
56

return lWordArray;
57

}
58

function WordToHex(lValue)

{
59

var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
60

for (lCount = 0;lCount<=3;lCount++)

{
61

lByte = (lValue>>>(lCount*8)) & 255;
62

WordToHexValue_temp = "0" + lByte.toString(16);
63

WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
64

}
65

return WordToHexValue;
66

}
67

var x=Array();
68

var k,AA,BB,CC,DD,a,b,c,d
69

var S11=7, S12=12, S13=17, S14=22;
70

var S21=5, S22=9 , S23=14, S24=20;
71

var S31=4, S32=11, S33=16, S34=23;
72

var S41=6, S42=10, S43=15, S44=21;
73

// Steps 1 and 2. Append padding bits and length and convert to words
74

x = ConvertToWordArray(strPassword);
75

// Step 3. Initialise
76

a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
77

// Step 4. Process the message in 16-word blocks
78

for (k=0;k<x.length;k+=16)

{
79

AA=a; BB=b; CC=c; DD=d;
80

a=FF(a,b,c,d,x[k+0], S11,0xD76AA478);
81

d=FF(d,a,b,c,x[k+1], S12,0xE8C7B756);
82

c=FF(c,d,a,b,x[k+2], S13,0x242070DB);
83

b=FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE);
84

a=FF(a,b,c,d,x[k+4], S11,0xF57C0FAF);
85

d=FF(d,a,b,c,x[k+5], S12,0x4787C62A);
86

c=FF(c,d,a,b,x[k+6], S13,0xA8304613);
87

b=FF(b,c,d,a,x[k+7], S14,0xFD469501);
88

a=FF(a,b,c,d,x[k+8], S11,0x698098D8);
89

d=FF(d,a,b,c,x[k+9], S12,0x8B44F7AF);
90

c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
91

b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
92

a=FF(a,b,c,d,x[k+12],S11,0x6B901122);
93

d=FF(d,a,b,c,x[k+13],S12,0xFD987193);
94

c=FF(c,d,a,b,x[k+14],S13,0xA679438E);
95

b=FF(b,c,d,a,x[k+15],S14,0x49B40821);
96

a=GG(a,b,c,d,x[k+1], S21,0xF61E2562);
97

d=GG(d,a,b,c,x[k+6], S22,0xC040B340);
98

c=GG(c,d,a,b,x[k+11],S23,0x265E5A51);
99

b=GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA);
100

a=GG(a,b,c,d,x[k+5], S21,0xD62F105D);
101

d=GG(d,a,b,c,x[k+10],S22,0x2441453);
102

c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
103

b=GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8);
104

a=GG(a,b,c,d,x[k+9], S21,0x21E1CDE6);
105

d=GG(d,a,b,c,x[k+14],S22,0xC33707D6);
106

c=GG(c,d,a,b,x[k+3], S23,0xF4D50D87);
107

b=GG(b,c,d,a,x[k+8], S24,0x455A14ED);
108

a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
109

d=GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8);
110

c=GG(c,d,a,b,x[k+7], S23,0x676F02D9);
111

b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
112

a=HH(a,b,c,d,x[k+5], S31,0xFFFA3942);
113

d=HH(d,a,b,c,x[k+8], S32,0x8771F681);
114

c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
115

b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
116

a=HH(a,b,c,d,x[k+1], S31,0xA4BEEA44);
117

d=HH(d,a,b,c,x[k+4], S32,0x4BDECFA9);
118

c=HH(c,d,a,b,x[k+7], S33,0xF6BB4B60);
119

b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
120

a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
121

d=HH(d,a,b,c,x[k+0], S32,0xEAA127FA);
122

c=HH(c,d,a,b,x[k+3], S33,0xD4EF3085);
123

b=HH(b,c,d,a,x[k+6], S34,0x4881D05);
124

a=HH(a,b,c,d,x[k+9], S31,0xD9D4D039);
125

d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
126

c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
127

b=HH(b,c,d,a,x[k+2], S34,0xC4AC5665);
128

a=II(a,b,c,d,x[k+0], S41,0xF4292244);
129

d=II(d,a,b,c,x[k+7], S42,0x432AFF97);
130

c=II(c,d,a,b,x[k+14],S43,0xAB9423A7);
131

b=II(b,c,d,a,x[k+5], S44,0xFC93A039);
132

a=II(a,b,c,d,x[k+12],S41,0x655B59C3);
133

d=II(d,a,b,c,x[k+3], S42,0x8F0CCC92);
134

c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
135

b=II(b,c,d,a,x[k+1], S44,0x85845DD1);
136

a=II(a,b,c,d,x[k+8], S41,0x6FA87E4F);
137

d=II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);
138

c=II(c,d,a,b,x[k+6], S43,0xA3014314);
139

b=II(b,c,d,a,x[k+13],S44,0x4E0811A1);
140

a=II(a,b,c,d,x[k+4], S41,0xF7537E82);
141

d=II(d,a,b,c,x[k+11],S42,0xBD3AF235);
142

c=II(c,d,a,b,x[k+2], S43,0x2AD7D2BB);
143

b=II(b,c,d,a,x[k+9], S44,0xEB86D391);
144

a=AddUnsigned(a,AA); b=AddUnsigned(b,BB); c=AddUnsigned(c,CC); d=AddUnsigned(d,DD);
145

}
146

// Step 5. Output the 128 bit digest
147

var temp= WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d);
148

return temp.toLowerCase();
149

}

转载于:https://www.cnblogs.com/smartstone/archive/2009/03/06/1404988.html