https://www.whselfinvest.co.uk/js/sha1.js

1/**
2* Secure Hash Algorithm (SHA1)
3* http://www.webtoolkit.info/
4**/
5function SHA1(msg) {
6 function rotate_left(n,s) {
7 var t4 = ( n<<s ) | (n>>>(32-s));
8 return t4;
9 };
10 function lsb_hex(val) {
11 var str='';
12 var i;
13 var vh;
14 var vl;
15 for( i=0; i<=6; i+=2 ) {
16 vh = (val>>>(i*4+4))&0x0f;
17 vl = (val>>>(i*4))&0x0f;
18 str += vh.toString(16) + vl.toString(16);
19 }
20 return str;
21 };
22 function cvt_hex(val) {
23 var str='';
24 var i;
25 var v;
26 for( i=7; i>=0; i-- ) {
27 v = (val>>>(i*4))&0x0f;
28 str += v.toString(16);
29 }
30 return str;
31 };
32 function Utf8Encode(string) {
33 string = string.replace(/\r\n/g,'\n');
34 var utftext = '';
35 for (var n = 0; n < string.length; n++) {
36 var c = string.charCodeAt(n);
37 if (c < 128) {
38 utftext += String.fromCharCode(c);
39 }
40 else if((c > 127) && (c < 2048)) {
41 utftext += String.fromCharCode((c >> 6) | 192);
42 utftext += String.fromCharCode((c & 63) | 128);
43 }
44 else {
45 utftext += String.fromCharCode((c >> 12) | 224);
46 utftext += String.fromCharCode(((c >> 6) & 63) | 128);
47 utftext += String.fromCharCode((c & 63) | 128);
48 }
49 }
50 return utftext;
51 };
52 var blockstart;
53 var i, j;
54 var W = new Array(80);
55 var H0 = 0x67452301;
56 var H1 = 0xEFCDAB89;
57 var H2 = 0x98BADCFE;
58 var H3 = 0x10325476;
59 var H4 = 0xC3D2E1F0;
60 var A, B, C, D, E;
61 var temp;
62 msg = Utf8Encode(msg);
63 var msg_len = msg.length;
64 var word_array = new Array();
65 for( i=0; i<msg_len-3; i+=4 ) {
66 j = msg.charCodeAt(i)<<24 | msg.charCodeAt(i+1)<<16 |
67 msg.charCodeAt(i+2)<<8 | msg.charCodeAt(i+3);
68 word_array.push( j );
69 }
70 switch( msg_len % 4 ) {
71 case 0:
72 i = 0x080000000;
73 break;
74 case 1:
75 i = msg.charCodeAt(msg_len-1)<<24 | 0x0800000;
76 break;
77 case 2:
78 i = msg.charCodeAt(msg_len-2)<<24 | msg.charCodeAt(msg_len-1)<<16 | 0x08000;
79 break;
80 case 3:
81 i = msg.charCodeAt(msg_len-3)<<24 | msg.charCodeAt(msg_len-2)<<16 | msg.charCodeAt(msg_len-1)<<8 | 0x80;
82 break;
83 }
84 word_array.push( i );
85 while( (word_array.length % 16) != 14 ) word_array.push( 0 );
86 word_array.push( msg_len>>>29 );
87 word_array.push( (msg_len<<3)&0x0ffffffff );
88 for ( blockstart=0; blockstart<word_array.length; blockstart+=16 ) {
89 for( i=0; i<16; i++ ) W[i] = word_array[blockstart+i];
90 for( i=16; i<=79; i++ ) W[i] = rotate_left(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
91 A = H0;

92 B = H1;
93 C = H2;
94 D = H3;
95 E = H4;
96 for( i= 0; i<=19; i++ ) {
97 temp = (rotate_left(A,5) + ((B&C) | (~B&D)) + E + W[i] + 0x5A827999) & 0x0ffffffff;
98 E = D;
99 D = C;
100 C = rotate_left(B,30);
101 B = A;
102 A = temp;
103 }
104 for( i=20; i<=39; i++ ) {
105 temp = (rotate_left(A,5) + (B ^ C ^ D) + E + W[i] + 0x6ED9EBA1) & 0x0ffffffff;
106 E = D;
107 D = C;
108 C = rotate_left(B,30);
109 B = A;
110 A = temp;
111 }
112 for( i=40; i<=59; i++ ) {
113 temp = (rotate_left(A,5) + ((B&C) | (B&D) | (C&D)) + E + W[i] + 0x8F1BBCDC) & 0x0ffffffff;
114 E = D;
115 D = C;
116 C = rotate_left(B,30);
117 B = A;
118 A = temp;
119 }
120 for( i=60; i<=79; i++ ) {
121 temp = (rotate_left(A,5) + (B ^ C ^ D) + E + W[i] + 0xCA62C1D6) & 0x0ffffffff;
122 E = D;
123 D = C;
124 C = rotate_left(B,30);
125 B = A;
126 A = temp;
127 }
128 H0 = (H0 + A) & 0x0ffffffff;
129 H1 = (H1 + B) & 0x0ffffffff;
130 H2 = (H2 + C) & 0x0ffffffff;
131 H3 = (H3 + D) & 0x0ffffffff;
132 H4 = (H4 + E) & 0x0ffffffff;
133 }
134 var temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4);
135
136 return temp.toLowerCase();
137}