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60 lines
1.4 KiB
60 lines
1.4 KiB
var base58 = require('./base58');
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var sha256sha256 = require('./hash').sha256sha256;
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var Base58Check = function Base58Check(buf) {
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if (!(this instanceof Base58Check))
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return new Base58Check(buf);
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this.buf = buf;
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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('Base58Check: Input must be a string');
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var buf = base58.decode(s);
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if (buf.length < 4)
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throw new Error("Base58Check: 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("Base58Check: Checksum mismatch");
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return data;
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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('Base58Check: Input must be a buffer');
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var checkedBuf = new Buffer(buf.length + 4);
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var hash = sha256sha256(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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