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import { Sha256 } from "@aws-crypto/sha256-universal"; | ||
import { base58 } from "ethers/lib/utils"; | ||
|
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/** | ||
* Computes a SHA-256 digest of the provided data and encodes it in Base58 with a 'z' prefix, | ||
* conforming to the Multibase encoding standard. This function is intended for generating | ||
* a multibase-encoded multihash, specifically using SHA-2 with 256-bits of output. | ||
* The multibase value is fixed as 'z' to match the specifications. | ||
* | ||
* @param {ArrayBuffer|string} data - The data to hash. This can be either a string or an ArrayBuffer. | ||
* @returns {Promise<string>} A promise that resolves to the Base58 encoded SHA-256 hash of the input data, | ||
* prefixed with 'z' as per the Multibase specification. | ||
*/ | ||
export async function computeDigestMultibase(data: ArrayBuffer | string): Promise<string> { | ||
const sha256 = new Sha256(); | ||
sha256.update(data); | ||
const sha256Digest = await sha256.digest(); | ||
// manually prefix with 'z' as per https://w3c-ccg.github.io/multibase/#mh-registry | ||
return `z${base58.encode(sha256Digest)}`; | ||
} |
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