40 lines
979 B
TypeScript
40 lines
979 B
TypeScript
// OP_RETURN {aa21a9ed} {commitment}
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import * as bscript from '../../script';
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import { OPS } from '../../script';
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import * as types from '../../types';
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const typeforce = require('typeforce');
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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 (
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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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}
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check.toJSON = (): string => {
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return 'Witness commitment output';
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};
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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 (bscript.decompile(buffer)![1] as Buffer).slice(4, 36);
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}
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