Function importPublicKey

importPublicKey(pem: string): RSAPublicKey
Import a RSA public key from a PEM format string.
Parameters
- pem: string
  The PEM format string containing the public key.
Returns RSAPublicKey
An RSAPublicKey object that can be used to encrypt data.
Throws
If the PEM format is invalid or the key cannot be parsed.
Example
```
import { importPublicKey, sha256 } from 'rsa-oaep-encryption';

const PUBLIC_KEY = `-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA...
-----END PUBLIC KEY-----`;

const publicKey = importPublicKey(PUBLIC_KEY);
const encrypted = publicKey.encrypt('Hello, World!', sha256.create());
```
- Defined in mod.ts:54