jose.go
func EncryptBytes(payload []byte, alg string, enc string, key interface{}, options ...func(*JoseConfig)) (token string, err error) {

	cfg := &JoseConfig{CompressionAlg: "", Headers: make(map[string]interface{})}

	//apply extra options
	for _, option := range options {
		option(cfg)
	}

	//make sure required headers are managed by us
	cfg.Headers["alg"] = alg
	cfg.Headers["enc"] = enc

	byteContent := payload

	if cfg.CompressionAlg != "" {
		if zipAlg, ok := jwcCompressors[cfg.CompressionAlg]; ok {
			byteContent = zipAlg.Compress([]byte(payload))
			cfg.Headers["zip"] = cfg.CompressionAlg
		} else {
			return "", errors.New(fmt.Sprintf("jwt.Compress(): Unknown compression method '%v'", cfg.CompressionAlg))
		}

	} else {
		delete(cfg.Headers, "zip") //we not allow to manage 'zip' header manually for encryption
	}

	return encrypt(byteContent, cfg.Headers, key)
}
func EncryptBytes(payload []byte, alg string, enc string, key interface{}, options ...func(*JoseConfig)) (token string, err error) {

	cfg := &JoseConfig{CompressionAlg: "", Headers: make(map[string]interface{})}

	//apply extra options
	for _, option := range options {
		option(cfg)
	}

	//make sure required headers are managed by us
	cfg.Headers["alg"] = alg
	cfg.Headers["enc"] = enc

	byteContent := payload

	if cfg.CompressionAlg != "" {
		if zipAlg, ok := jwcCompressors[cfg.CompressionAlg]; ok {
			byteContent = zipAlg.Compress([]byte(payload))
			cfg.Headers["zip"] = cfg.CompressionAlg
		} else {
			return "", errors.New(fmt.Sprintf("jwt.Compress(): Unknown compression method '%v'", cfg.CompressionAlg))
		}

	} else {
		delete(cfg.Headers, "zip") //we not allow to manage 'zip' header manually for encryption
	}

	return encrypt(byteContent, cfg.Headers, key)
}
// Encrypt produces encrypted JWT token given arbitrary binary payload, key management and encryption algorithms to use (see constants for list of supported algs) and management key.
// Management key is of different type for different key management alg, see specific
// key management alg implementation documentation.
//
// It returns 5 parts encrypted JWT token as string and not nil error if something went wrong.