/**
 * Internal libsodium-backed sealed-box seam for KERIpy cipher parity.
 *
 * Boundary rule:
 * - CESR primitives own sealed-box behavior
 * - higher layers consume `Cipher`/`Encrypter`/`Decrypter`, not sodium calls
 * - this module returns only raw key/plaintext/cipher bytes; derivation codes
 *   and primitive hydration stay outside at the CESR primitive layer
 */
/** Derive X25519 public key material from one Ed25519 verifier key. */
export declare function boxPublicKeyFromEd25519Verfer(verferRaw: Uint8Array): Uint8Array;
/**
 * Derive the X25519 box keypair corresponding to one Ed25519 signing seed.
 *
 * KERIpy parity:
 * - derive the Ed25519 signing keypair first
 * - then convert both sides to the associated X25519 box keys
 */
export declare function boxKeyPairFromEd25519Seed(seedRaw: Uint8Array): {
    publicKey: Uint8Array;
    privateKey: Uint8Array;
};
/** Recover the X25519 public key corresponding to one raw X25519 private key. */
export declare function boxPublicKeyFromPrivateKey(privateKey: Uint8Array): Uint8Array;
/** Encrypt one plaintext using libsodium's X25519 sealed-box primitive. */
export declare function sealBox(plaintext: Uint8Array, publicKey: Uint8Array): Uint8Array;
/** Open one libsodium X25519 sealed-box ciphertext back to raw plaintext bytes. */
export declare function openSealedBox(cipher: Uint8Array, publicKey: Uint8Array, privateKey: Uint8Array): Uint8Array;
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