/**
 * Output of an ECIES-SECP256K1 encryption operation.
 */
export type EciesSecp256k1EncryptionOutput = {
    /** The AES-GCM initialization vector. */
    initializationVector: Uint8Array;
    /** The ephemeral secp256k1 public key (compressed, 33 bytes). */
    ephemeralPublicKey: Uint8Array;
    /** The encrypted data. */
    ciphertext: Uint8Array;
    /** The AES-GCM authentication tag (16 bytes). */
    messageAuthenticationCode: Uint8Array;
};
/**
 * Input required for ECIES-SECP256K1 decryption.
 */
export type EciesSecp256k1EncryptionInput = EciesSecp256k1EncryptionOutput & {
    /** The recipient's secp256k1 private key (raw 32 bytes). */
    privateKey: Uint8Array;
};
/**
 * Browser-compatible ECIES (Elliptic Curve Integrated Encryption Scheme) using secp256k1.
 *
 * Wire-format compatible with `eciesjs` v0.4.x configured with
 * `isEphemeralKeyCompressed: true, isHkdfKeyCompressed: false` (the default).
 *
 * Protocol:
 *   1. Generate an ephemeral secp256k1 key pair.
 *   2. ECDH shared secret (uncompressed point).
 *   3. HKDF-SHA-256 key derivation: `hkdf(sha256, ephemeralPubUncompressed || sharedPointUncompressed)`.
 *   4. AES-256-GCM encryption with random 16-byte nonce.
 *
 * All underlying primitives (`@noble/ciphers`, `@noble/curves`, `@noble/hashes`)
 * are pure JavaScript and work in Node, Bun, and browsers.
 */
export declare class EciesSecp256k1 {
    /**
     * Encrypt plaintext for a given secp256k1 public key.
     * @param publicKeyBytes - Recipient's public key (compressed 33 bytes or uncompressed 65 bytes).
     * @param plaintext - The data to encrypt.
     */
    static encrypt(publicKeyBytes: Uint8Array, plaintext: Uint8Array): EciesSecp256k1EncryptionOutput;
    /**
     * Decrypt ciphertext produced by {@link EciesSecp256k1.encrypt}.
     * @param input - The encryption output plus the recipient's private key.
     */
    static decrypt(input: EciesSecp256k1EncryptionInput): Uint8Array;
    /**
     * Whether the ephemeral public key is compressed (always true for this implementation).
     */
    static get isEphemeralKeyCompressed(): boolean;
}
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