72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
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//https://raw.github.com/bitcoinjs/bitcoinjs-lib/c952aaeb3ee472e3776655b8ea07299ebed702c7/src/base58.js
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(function (Bitcoin) {
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Bitcoin.Base58 = {
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alphabet: "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz",
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validRegex: /^[1-9A-HJ-NP-Za-km-z]+$/,
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base: BigInteger.valueOf(58),
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/**
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* Convert a byte array to a base58-encoded string.
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*
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* Written by Mike Hearn for BitcoinJ.
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* Copyright (c) 2011 Google Inc.
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*
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* Ported to JavaScript by Stefan Thomas.
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*/
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encode: function (input) {
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var bi = BigInteger.fromByteArrayUnsigned(input);
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var chars = [];
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while (bi.compareTo(B58.base) >= 0) {
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var mod = bi.mod(B58.base);
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chars.unshift(B58.alphabet[mod.intValue()]);
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bi = bi.subtract(mod).divide(B58.base);
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}
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chars.unshift(B58.alphabet[bi.intValue()]);
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// Convert leading zeros too.
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for (var i = 0; i < input.length; i++) {
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if (input[i] == 0x00) {
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chars.unshift(B58.alphabet[0]);
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} else break;
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}
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return chars.join('');
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},
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/**
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* Convert a base58-encoded string to a byte array.
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*
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* Written by Mike Hearn for BitcoinJ.
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* Copyright (c) 2011 Google Inc.
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*
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* Ported to JavaScript by Stefan Thomas.
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*/
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decode: function (input) {
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var bi = BigInteger.valueOf(0);
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var leadingZerosNum = 0;
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for (var i = input.length - 1; i >= 0; i--) {
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var alphaIndex = B58.alphabet.indexOf(input[i]);
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if (alphaIndex < 0) {
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throw "Invalid character";
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}
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bi = bi.add(BigInteger.valueOf(alphaIndex)
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.multiply(B58.base.pow(input.length - 1 - i)));
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// This counts leading zero bytes
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if (input[i] == "1") leadingZerosNum++;
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else leadingZerosNum = 0;
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}
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var bytes = bi.toByteArrayUnsigned();
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// Add leading zeros
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while (leadingZerosNum-- > 0) bytes.unshift(0);
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return bytes;
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}
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};
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var B58 = Bitcoin.Base58;
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})(
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'undefined' != typeof Bitcoin ? Bitcoin : module.exports
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);
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