33 lines
1 KiB
TypeScript
33 lines
1 KiB
TypeScript
// m [pubKeys ...] n OP_CHECKMULTISIG
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import { Stack } from '../../payments';
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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 OP_INT_BASE = OPS.OP_RESERVED; // OP_1 - 1
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export function check(
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script: Buffer | Stack,
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allowIncomplete?: boolean,
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): boolean {
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const chunks = bscript.decompile(script) as Stack;
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if (chunks.length < 4) return false;
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if (chunks[chunks.length - 1] !== OPS.OP_CHECKMULTISIG) return false;
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if (!types.Number(chunks[0])) return false;
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if (!types.Number(chunks[chunks.length - 2])) return false;
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const m = (chunks[0] as number) - OP_INT_BASE;
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const n = (chunks[chunks.length - 2] as number) - OP_INT_BASE;
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if (m <= 0) return false;
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if (n > 16) return false;
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if (m > n) return false;
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if (n !== chunks.length - 3) return false;
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if (allowIncomplete) return true;
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const keys = chunks.slice(1, -2) as Buffer[];
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return keys.every(bscript.isCanonicalPubKey);
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}
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check.toJSON = () => {
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return 'multi-sig output';
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};
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