fhe

type Ciphertext interface {
	// Bytes returns the serialized ciphertext
	Bytes() []byte

	// Add performs homomorphic addition with another ciphertext
	Add(other Ciphertext) (Ciphertext, error)

	// Multiply performs homomorphic multiplication with another ciphertext
	Multiply(other Ciphertext) (Ciphertext, error)
}

type Operation int

type PrivateKey interface {
	Bytes() []byte
}

type PrivateMessage struct {
	// Encrypted source chain ID
	SourceChain Ciphertext

	// Encrypted destination chain ID
	DestChain Ciphertext

	// Encrypted payload
	Payload Ciphertext

	// Public metadata (for routing)
	Metadata []byte
}

type PublicKey interface {
	Bytes() []byte
}

type Scheme interface {
	// Encrypt encrypts a plaintext message
	Encrypt(plaintext []byte, publicKey PublicKey) (Ciphertext, error)

	// Decrypt decrypts a ciphertext
	Decrypt(ciphertext Ciphertext, privateKey PrivateKey) ([]byte, error)

	// Evaluate performs homomorphic evaluation on encrypted data
	Evaluate(op Operation, ciphertexts ...Ciphertext) (Ciphertext, error)

	// GenerateKeys generates a new public/private key pair
	GenerateKeys() (PublicKey, PrivateKey, error)
}