@credo-ts/core/build/utils/MultiHashEncoder.mjs

<p align="center"> <br /> <img alt="Credo Logo" src="https://github.com/openwallet-foundation/credo-ts/blob/c7886cb8377ceb8ee4efe8d264211e561a75072d/images/credo-logo.png" height="250px" /> </p> <h1 align="center"><b>Credo - Core</b></h1

import { TypedArrayEncoder } from "./TypedArrayEncoder.mjs";
import { Hasher } from "../crypto/hashes/Hasher.mjs";
import { VarintEncoder } from "./VarintEncoder.mjs";
//#region src/utils/MultiHashEncoder.ts
const multiHashNameMap = {
	"sha-1": 17,
	"sha-256": 18,
	"sha-512": 19,
	"sha-384": 32
};
const multiHashCodeMap = Object.entries(multiHashNameMap).reduce((map, [hashName, hashCode]) => ({
	...map,
	[hashCode]: hashName
}), {});
var MultiHashEncoder = class MultiHashEncoder {
	/**
	*
	* Encodes a buffer into a hash
	*
	* @param buffer the buffer that has to be encoded
	* @param hashName the hashing algorithm, 'sha-256'
	*
	* @returns a multihash
	*/
	static encode(data, hashName) {
		const hash = Hasher.hash(data, hashName);
		const hashCode = multiHashNameMap[hashName];
		const hashPrefix = VarintEncoder.encode(hashCode);
		const hashLengthPrefix = VarintEncoder.encode(hash.length);
		return TypedArrayEncoder.concat([
			hashPrefix,
			hashLengthPrefix,
			hash
		]);
	}
	/**
	*
	* Decodes the multihash
	*
	* @param data the multihash that has to be decoded
	*
	* @returns object with the data and the hashing algorithm
	*/
	static decode(data) {
		const [hashPrefix, hashPrefixByteLength] = VarintEncoder.decode(data);
		const withoutHashPrefix = data.slice(hashPrefixByteLength);
		const [, lengthPrefixByteLength] = VarintEncoder.decode(withoutHashPrefix);
		const withoutLengthPrefix = withoutHashPrefix.slice(lengthPrefixByteLength);
		if (!multiHashCodeMap[hashPrefix]) throw new Error(`Unsupported hash code 0x${hashPrefix.toString(16)}`);
		return {
			data: new Uint8Array(withoutLengthPrefix),
			hashName: multiHashCodeMap[hashPrefix]
		};
	}
	/**
	*
	* Validates if it is a valid mulithash
	*
	* @param data the multihash that needs to be validated
	*
	* @returns a boolean whether the multihash is valid
	*/
	static isValid(data) {
		try {
			MultiHashEncoder.decode(data);
			return true;
		} catch (_e) {
			return false;
		}
	}
};
//#endregion
export { MultiHashEncoder };

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