Created
September 19, 2016 12:28
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Check BTC Address
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| $.getScript("../scripts/Sha256.js"); | |
| $.getScript("../scripts/BigInt.js"); | |
| // ----------------- FUNCTIONS------------------// | |
| function check(address) { | |
| var decoded = base58_decode(address); | |
| if (decoded.length != 25) return false; | |
| var cksum = decoded.substr(decoded.length - 4); | |
| var rest = decoded.substr(0, decoded.length - 4); | |
| var good_cksum = hex2a(sha256_digest(hex2a(sha256_digest(rest)))).substr(0, 4); | |
| if (cksum != good_cksum) return false; | |
| return true; | |
| } // End check | |
| function base58_decode(string) { | |
| var table = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'; | |
| var tableArray = new Array(); | |
| var i; | |
| for (i = 0; i < 58; i++) { | |
| tableArray[table[i]] = int2bigInt(i, 8, 0); | |
| } | |
| var l = string.length; | |
| var long_value = int2bigInt(0, 1, 0); | |
| var num_58 = int2bigInt(58, 8, 0); | |
| var c; | |
| for(i = 0; i < l; i++) { | |
| c = string[l - i - 1]; | |
| long_value = add(long_value, mult(tableArray[c], pow(num_58, i))); | |
| } | |
| var hex = bigInt2str(long_value, 16); | |
| var str = hex2a(hex); | |
| var numberPad; | |
| for (numberPad = 0; string[numberPad] == table[0]; numberPad++); | |
| var output = str; | |
| if (numberPad > 0) output = repeat("\0", numberPad) + str; | |
| return output; | |
| } // End base58_decode | |
| function hex2a(hex) { | |
| var str = ''; | |
| for (var i = 0; i < hex.length; i += 2) | |
| str += String.fromCharCode(parseInt(hex.substr(i, 2), 16)); | |
| return str; | |
| } // End hex2a | |
| function a2hex(str) { | |
| var aHex = "0123456789abcdef"; | |
| var l = str.length; | |
| var nBuf; | |
| var strBuf; | |
| var strOut = ""; | |
| for (var i = 0; i < l; i++) { | |
| nBuf = str.charCodeAt(i); | |
| strBuf = aHex[Math.floor(nBuf/16)]; | |
| strBuf += aHex[nBuf % 16]; | |
| strOut += strBuf; | |
| } | |
| return strOut; | |
| } // End a2hex | |
| function pow(big, exp) { | |
| if (exp == 0) return int2bigInt(1, 1, 0); | |
| var i; | |
| var newbig = big; | |
| for (i = 1; i < exp; i++) { | |
| newbig = mult(newbig, big); | |
| } | |
| return newbig; | |
| } // End pow | |
| function repeat(s, n){ | |
| var a = []; | |
| while(a.length < n){ | |
| a.push(s); | |
| } | |
| return a.join(''); | |
| } // End repeat |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Check BTC Address</title> | |
| <script src="../scripts/jquery-1.11.1.js"></script> | |
| <script src="../scripts/check-address.js"></script> | |
| </head> | |
| <body> | |
| </body> | |
| <script> | |
| $(document).ready(function() { | |
| setTimeout(function(){ | |
| var address = "1Eym7pyJcaambv8FG4ZoU8A4xsiL9us2zz"; | |
| var result = check(address); | |
| console.log(result); | |
| var address2 = "1Eym7pyJcaambv8FG4ZoU8A4xsiL9us2za"; | |
| var result2 = check(address2); | |
| console.log(result2); | |
| }, 10); | |
| }); | |
| </script> | |
| </html> | |
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