Created
February 13, 2014 19:00
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A simple hashcash-ish thing in js
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8" /> | |
</head> | |
<body> | |
<script id="worker1" type="javascript/worker"> | |
/*! | |
* A crc32 function that will produce the same result as PHP's crc32() function | |
* (http://php.net/crc32). | |
* | |
* The string used in PHP must be encoded in UTF-8 or the checksums will be | |
* different. Use the following PHP to get the unsigned integer result: | |
* | |
* sprintf('%u', crc32($string)); | |
* | |
* Copyright 2010, Will Bond <will@wbond.net> | |
* Released under the MIT license | |
*/ | |
(function() { | |
var table = [ | |
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, | |
0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, | |
0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, | |
0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, | |
0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, | |
0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, | |
0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, | |
0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, | |
0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, | |
0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, | |
0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106, | |
0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, | |
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, | |
0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, | |
0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, | |
0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, | |
0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, | |
0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, | |
0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, | |
0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, | |
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, | |
0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, | |
0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, | |
0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, | |
0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, | |
0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, | |
0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, | |
0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, | |
0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, | |
0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, | |
0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, | |
0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, | |
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, | |
0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, | |
0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, | |
0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, | |
0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, | |
0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, | |
0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, | |
0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, | |
0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, | |
0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, | |
0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D | |
]; | |
crc32 = function(string) { | |
// This converts a unicode string to UTF-8 bytes | |
string = unescape(encodeURI(string)); | |
var crc = 0 ^ (-1); | |
var len = string.length; | |
for (var i=0; i < len; i++) { | |
crc = (crc >>> 8) ^ table[ | |
(crc ^ string.charCodeAt(i)) & 0xFF | |
]; | |
} | |
crc = crc ^ (-1); | |
// Turns the signed integer into an unsigned integer | |
if (crc < 0) { | |
crc += 4294967296; | |
} | |
return crc; | |
}; | |
})(); | |
addEventListener('message', function(e) { | |
var salt = e.data['salt'], | |
prefix = e.data['prefix']; | |
for (var i = 2821109907455; i >= 0; i--) { | |
if (crc32(salt + i.toString(36)).toString(16).substr(0, prefix.length) == prefix) { | |
self.postMessage({ | |
result: i.toString(36), | |
numeric: i, | |
full: salt + i.toString(36) | |
}); | |
break; | |
} | |
}; | |
}); | |
</script> | |
<script> | |
makeWorkerById = function(id) { | |
var blob = new Blob([document.getElementById(id).textContent]); | |
return new Worker(window.URL.createObjectURL(blob)); | |
}; | |
hashpay = function(callback) { | |
var worker = makeWorkerById("worker1"); | |
worker.onmessage = function(e) { | |
callback(e.data); | |
} | |
worker.postMessage({ | |
salt: "SHINDOWS 0000A", | |
prefix: "f9d0b" | |
}); | |
}; | |
hashpay(console.log); | |
</script> | |
</body> | |
</html> |
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