36 lines
950 B
TypeScript
36 lines
950 B
TypeScript
// OP_RETURN {aa21a9ed} {commitment}
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import * as bscript from '../../script'
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import * as types from '../../types'
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const typeforce = require('typeforce')
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import { OPS } from '../../script'
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const HEADER: Buffer = Buffer.from('aa21a9ed', 'hex')
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export function check (script: Buffer | Array<number | Buffer>): boolean {
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const buffer = bscript.compile(script)
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return buffer.length > 37 &&
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buffer[0] === OPS.OP_RETURN &&
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buffer[1] === 0x24 &&
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buffer.slice(2, 6).equals(HEADER)
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}
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check.toJSON = function () { return 'Witness commitment output' }
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export function encode (commitment: Buffer): Buffer {
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typeforce(types.Hash256bit, commitment)
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const buffer = Buffer.allocUnsafe(36)
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HEADER.copy(buffer, 0)
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commitment.copy(buffer, 4)
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return bscript.compile([OPS.OP_RETURN, buffer])
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}
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export function decode (buffer: Buffer): Buffer {
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typeforce(check, buffer)
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return (<Buffer>bscript.decompile(buffer)![1]).slice(4, 36)
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}
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