LukaJCB / ts-mls / 17308535327

import { sha256, sha384, sha512 } from "@noble/hashes/sha2.js"

import { hmac } from "@noble/hashes/hmac.js"

export function makeHashImpl(h: HashAlgorithm): Hash {

  return {

    async digest(data) {

      switch (h) {

        case "SHA-256":

          return sha256(data)

        case "SHA-384":

          return sha384(data)

        case "SHA-512":

          return sha512(data)

        default:

          throw new Error(`Unsupported hash algorithm: ${h}`)

      }

    },

    async mac(key, data) {

      switch (h) {

        case "SHA-256":

          return hmac(sha256, key, data)

        case "SHA-384":

          return hmac(sha384, key, data)

        case "SHA-512":

          return hmac(sha512, key, data)

        default:

          throw new Error(`Unsupported hash algorithm: ${h}`)

      }

    },

    async verifyMac(key, mac, data) {

      const expectedMac = await this.mac(key, data)

      return mac.length === expectedMac.length && mac.every((byte, i) => byte === expectedMac[i])

    },

  }

}