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95 lines
2.2 KiB
95 lines
2.2 KiB
'use strict';
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var _ = require('lodash');
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var Base58 = require('./base58');
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var buffer = require('buffer');
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var sha256sha256 = require('../crypto/hash').sha256sha256;
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var Base58Check = function Base58Check(obj) {
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if (!(this instanceof Base58Check))
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return new Base58Check(obj);
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if (Buffer.isBuffer(obj)) {
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var buf = obj;
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this.fromBuffer(buf);
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} else if (typeof obj === 'string') {
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var str = obj;
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this.fromString(str);
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} else if (obj) {
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this.set(obj);
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}
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};
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Base58Check.prototype.set = function(obj) {
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this.buf = obj.buf || this.buf || undefined;
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return this;
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};
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Base58Check.validChecksum = function validChecksum(data, checksum) {
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if (_.isString(data)) {
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data = new buffer.Buffer(Base58.decode(data));
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}
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if (_.isString(checksum)) {
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checksum = new buffer.Buffer(Base58.decode(checksum));
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}
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if (!checksum) {
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checksum = data.slice(-4);
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data = data.slice(0, -4);
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}
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return Base58Check.checksum(data).toString('hex') === checksum.toString('hex');
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};
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Base58Check.decode = function(s) {
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if (typeof s !== 'string')
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throw new Error('Input must be a string');
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var buf = new Buffer(Base58.decode(s));
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if (buf.length < 4)
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throw new Error("Input string too short");
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var data = buf.slice(0, -4);
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var csum = buf.slice(-4);
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var hash = sha256sha256(data);
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var hash4 = hash.slice(0, 4);
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if (csum.toString('hex') !== hash4.toString('hex'))
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throw new Error("Checksum mismatch");
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return data;
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};
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Base58Check.checksum = function(buffer) {
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return sha256sha256(buffer).slice(0, 4);
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};
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Base58Check.encode = function(buf) {
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if (!Buffer.isBuffer(buf))
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throw new Error('Input must be a buffer');
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var checkedBuf = new Buffer(buf.length + 4);
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var hash = Base58Check.checksum(buf);
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buf.copy(checkedBuf);
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hash.copy(checkedBuf, buf.length);
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return Base58.encode(checkedBuf);
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};
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Base58Check.prototype.fromBuffer = function(buf) {
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this.buf = buf;
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return this;
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};
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Base58Check.prototype.fromString = function(str) {
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var buf = Base58Check.decode(str);
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this.buf = buf;
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return this;
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};
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Base58Check.prototype.toBuffer = function() {
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return this.buf;
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};
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Base58Check.prototype.toString = function() {
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return Base58Check.encode(this.buf);
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};
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module.exports = Base58Check;
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