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function sha1 (str) { |
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// discuss at: http://phpjs.org/functions/sha1/ |
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// original by: Webtoolkit.info (http://www.webtoolkit.info/) |
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// improved by: Michael White (http://getsprink.com) |
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// improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) |
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// input by: Brett Zamir (http://brett-zamir.me) |
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// example 1: sha1('Kevin van Zonneveld'); |
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// returns 1: '54916d2e62f65b3afa6e192e6a601cdbe5cb5897' |
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var rotate_left = function (n, s) { |
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var t4 = (n << s) | (n >>> (32 – s)) |
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return t4 |
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} |
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/* var lsb_hex = function (val) { |
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// Not in use; needed? |
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var str=""; |
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var i; |
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var vh; |
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var vl; |
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for ( i=0; i<=6; i+=2 ) { |
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vh = (val>>>(i*4+4))&0x0f; |
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vl = (val>>>(i*4))&0x0f; |
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str += vh.toString(16) + vl.toString(16); |
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} |
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return str; |
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};*/ |
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var cvt_hex = function (val) { |
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var str = '' |
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var i |
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var v |
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for (i = 7; i >= 0; i–) { |
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v = (val >>> (i * 4)) & 0x0f |
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str += v.toString(16) |
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} |
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return str |
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} |
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var blockstart |
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var i, j |
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var W = new Array(80) |
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var H0 = 0x67452301 |
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var H1 = 0xEFCDAB89 |
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var H2 = 0x98BADCFE |
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var H3 = 0x10325476 |
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var H4 = 0xC3D2E1F0 |
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var A, B, C, D, E |
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var temp |
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// utf8_encode |
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str = unescape(encodeURIComponent(str)) |
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var str_len = str.length |
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var word_array = [] |
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for (i = 0; i < str_len – 3; i += 4) { |
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j = str.charCodeAt(i) << 24 | str.charCodeAt(i + 1) << 16 | str.charCodeAt(i + 2) << 8 | str.charCodeAt(i + 3) |
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word_array.push(j) |
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} |
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switch (str_len % 4) { |
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case 0: |
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i = 0x080000000 |
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break |
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case 1: |
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i = str.charCodeAt(str_len – 1) << 24 | 0x0800000 |
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break |
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case 2: |
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i = str.charCodeAt(str_len – 2) << 24 | str.charCodeAt(str_len – 1) << 16 | 0x08000 |
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break |
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case 3: |
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i = str.charCodeAt(str_len – 3) << 24 | str.charCodeAt(str_len – 2) << 16 | str.charCodeAt(str_len – 1) << |
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8 | 0x80 |
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break |
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} |
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word_array.push(i) |
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while ((word_array.length % 16) != 14) { |
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word_array.push(0) |
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} |
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word_array.push(str_len >>> 29) |
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word_array.push((str_len << 3) & 0x0ffffffff) |
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for (blockstart = 0; blockstart < word_array.length; blockstart += 16) { |
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for (i = 0; i < 16; i++) { |
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W[i] = word_array[blockstart + i] |
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} |
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for (i = 16; i <= 79; i++) { |
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W[i] = rotate_left(W[i – 3] ^ W[i – 8] ^ W[i – 14] ^ W[i – 16], 1) |
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} |
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A = H0 |
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B = H1 |
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C = H2 |
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D = H3 |
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E = H4 |
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for (i = 0; i <= 19; i++) { |
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temp = (rotate_left(A, 5) + ((B & C) | (~B & D)) + E + W[i] + 0x5A827999) & 0x0ffffffff |
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E = D |
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D = C |
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C = rotate_left(B, 30) |
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B = A |
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A = temp |
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} |
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for (i = 20; i <= 39; i++) { |
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temp = (rotate_left(A, 5) + (B ^ C ^ D) + E + W[i] + 0x6ED9EBA1) & 0x0ffffffff |
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E = D |
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D = C |
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C = rotate_left(B, 30) |
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B = A |
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A = temp |
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} |
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for (i = 40; i <= 59; i++) { |
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temp = (rotate_left(A, 5) + ((B & C) | (B & D) | (C & D)) + E + W[i] + 0x8F1BBCDC) & 0x0ffffffff |
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E = D |
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D = C |
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C = rotate_left(B, 30) |
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B = A |
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A = temp |
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} |
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for (i = 60; i <= 79; i++) { |
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temp = (rotate_left(A, 5) + (B ^ C ^ D) + E + W[i] + 0xCA62C1D6) & 0x0ffffffff |
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E = D |
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D = C |
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C = rotate_left(B, 30) |
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B = A |
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A = temp |
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} |
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H0 = (H0 + A) & 0x0ffffffff |
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H1 = (H1 + B) & 0x0ffffffff |
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H2 = (H2 + C) & 0x0ffffffff |
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H3 = (H3 + D) & 0x0ffffffff |
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H4 = (H4 + E) & 0x0ffffffff |
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} |
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temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4) |
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return temp.toLowerCase() |
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} |
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var string = "This string is about to be encoded with sha1"; |
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var encodedString = sha1(string); |
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