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54 lines
1.2 KiB
54 lines
1.2 KiB
11 years ago
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// https://en.bitcoin.it/wiki/Base58Check_encoding
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var assert = require('assert')
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var base58 = require('./base58')
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var crypto = require('crypto')
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function sha256(buf) {
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var hash = crypto.createHash('sha256')
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hash.update(buf)
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return hash.digest()
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}
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// Encode a buffer as a base58-check-encoded string
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function encode(buffer, version) {
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version = version || 0
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// FIXME: `new Buffer(buffer)` is unnecessary if input is a Buffer
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var version = new Buffer([version])
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var payload = new Buffer(buffer)
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var message = Buffer.concat([version, payload])
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var checksum = sha256(sha256(message)).slice(0, 4)
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return base58.encode(Buffer.concat([
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message,
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checksum
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]))
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}
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// Decode a base58-check-encoded string to a buffer
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function decode(string) {
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var buffer = base58.decode(string)
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var message = buffer.slice(0, -4)
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var checksum = buffer.slice(-4)
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var newChecksum = sha256(sha256(message)).slice(0, 4)
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assert.deepEqual(newChecksum, checksum)
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var version = message.readUInt8(0)
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var payload = message.slice(1)
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return {
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version: version,
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payload: payload,
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checksum: checksum
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}
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}
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module.exports = {
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encode: encode,
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decode: decode
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}
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