# init(pemRepresentation:) Parses an RSA public key from a PEM-encoded SPKI string. ``` init(pemRepresentation: String) throws ``` ## Parameters `pemRepresentation` The PEM-encoded SPKI public key. The RFC 7468 framing is mandatory; whitespace around the markers and inside the base64 body is permitted. ## Discussion Performs outer-frame validation only: the input must be valid UTF-8 and must contain both a `-----BEGIN` marker and a `PUBLIC KEY-----` marker. The check is deliberately narrower than the private-key counterpart — a traditional PKCS#1 `-----BEGIN RSA PUBLIC KEY-----` header would pass the `PUBLIC KEY-----` substring test but is rejected by downstream consumers of `pemData`; normalize to SPKI before calling. > Warning: Validation is **string-marker-only**. A malformed > SubjectPublicKeyInfo payload inside a valid PEM frame is > not detected here. Future provider-backed verification will > reject such inputs before use. > Throws: ``doc://OpenSSL/documentation/OpenSSL/OpenSSLError/invalidKey(_:)`` if the input is not > valid UTF-8 or lacks the expected frame markers.