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x/jose/runtime/get_sign_verify_key.ts

"JSON Web Almost Everything" - JWA, JWS, JWE, JWT, JWK, JWKS with no dependencies using runtime's native crypto in Node.js, Browser, Cloudflare Workers, Electron, and Deno.
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import crypto, { isCryptoKey } from './webcrypto.ts'import { checkSigCryptoKey } from '../lib/crypto_key.ts'import invalidKeyInput from '../lib/invalid_key_input.ts'
export default function getCryptoKey(alg: string, key: unknown, usage: KeyUsage) {  if (isCryptoKey(key)) {    checkSigCryptoKey(key, alg, usage)    return key  }
  if (key instanceof Uint8Array) {    if (!alg.startsWith('HS')) {      throw new TypeError(invalidKeyInput(key, 'CryptoKey'))    }    return crypto.subtle.importKey(      'raw',      key,      { hash: `SHA-${alg.substr(-3)}`, name: 'HMAC' },      false,      [usage],    )  }
  throw new TypeError(invalidKeyInput(key, 'CryptoKey', 'Uint8Array'))}