code: func ReadPublic(raw []byte) (key *rsa.PublicKey,err error)  {
  	var encoded *pem.Block
  	
  	if encoded, _ = pem.Decode(raw); encoded == nil {
  		return nil, errors.New("Rsa.NewPublic(): Key must be PEM encoded PKCS1 X509 certificate or PKIX public key")
  	}
  		
  	var parsedKey interface{}
  	var cert *x509.Certificate
  	
  	if parsedKey, err = x509.ParsePKIXPublicKey(encoded.Bytes); err != nil {
  		if cert,err = x509.ParseCertificate(encoded.Bytes);err!=nil {
  			return nil, err
  		}
  		
  		parsedKey=cert.PublicKey
  	}
  	
  	var ok bool
  	
  	if key, ok = parsedKey.(*rsa.PublicKey); !ok {
  		return nil, errors.New("Rsa.NewPublic(): Key is not a valid RSA public key")
  	}
  	
  	return key, nil
  }
docs: // ReadPublic loads rsa.PublicKey from PKIX or PKCS1 X509 blobs