28 lines
640 B
TypeScript
28 lines
640 B
TypeScript
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export function fastMerkleRoot(
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values: Buffer[],
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digestFn: (b: Buffer) => Buffer,
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): Buffer {
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if (!Array.isArray(values)) throw TypeError('Expected values Array');
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if (typeof digestFn !== 'function')
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throw TypeError('Expected digest Function');
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let length = values.length;
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const results = values.concat();
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while (length > 1) {
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let j = 0;
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for (let i = 0; i < length; i += 2, ++j) {
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const left = results[i];
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const right = i + 1 === length ? left : results[i + 1];
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const data = Buffer.concat([left, right]);
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results[j] = digestFn(data);
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}
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length = j;
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}
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return results[0];
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}
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