import type { CryptographyKey } from './symmetric.js';
export type Keypair = {
    secretKey: CryptoKey;
    publicKey: CryptoKey;
};
/**
 * Helper -- uint8 to ArrayBuffer
 */
export declare function toArrayBuffer(u8: Uint8Array): ArrayBuffer;
/**
 * Concatenate some number of Uint8Array objects
 *
 * @param {Uint8Array[]} args
 * @returns {Uint8Array}
 */
export declare function concat(...args: Uint8Array[]): Uint8Array<ArrayBuffer>;
/**
 * Generate an Ed25519 identity key pair for signing operations.
 * Since the keys module doesn't directly support Ed25519 key generation,
 * we'll fall back to using Web Crypto API directly.
 *
 * @returns {Promise<{ publicKey: CryptoKey, privateKey: CryptoKey }>}
 */
export declare function generateEd25519IdentityKeyPair(): Promise<{
    publicKey: CryptoKey;
    privateKey: CryptoKey;
}>; /**
 * Generate an X25519 key pair for key exchange operations.
 *
 * @returns {Promise<Keypair>}
 */
export declare function generateKeyPair(): Promise<Keypair>;
/**
 * Generate a bundle of keypairs.
 *
 * @param {number} [preKeyCount=100]
 * @returns {Promise<Keypair[]>}
 */
export declare function generateBundle(preKeyCount?: number): Promise<Keypair[]>;
/**
 * Signs a bundle using Ed25519. Returns the signature.
 *
 * @param {CryptoKey} signingKey Ed25519 private key
 * @param {CryptoKey[]} publicKeys X25519 public keys
 * @returns {Promise<Uint8Array<ArrayBuffer>>}
 */
export declare function signBundle(signingKey: CryptoKey, publicKeys: CryptoKey[]): Promise<Uint8Array<ArrayBuffer>>;
/**
 * Verify a bundle signature using Ed25519.
 *
 * @param {CryptoKey} verificationKey Ed25519 public key
 * @param {CryptoKey[]} publicKeys X25519 public keys
 * @param {Uint8Array} signature
 */
export declare function verifyBundle(verificationKey: CryptoKey, publicKeys: CryptoKey[], signature: Uint8Array<ArrayBuffer>): Promise<boolean>;
/**
 * Wipe a cryptography key's internal buffer.
 * Note: This is a no-op for non-extractable keys in WebCrypto
 *
 * @param {CryptographyKey} key
 */
export declare function wipe(key: CryptographyKey): Promise<void>;
/**
 * Convert ArrayBuffer to hex string
 */
export declare function arrayBufferToHex(buffer: ArrayBuffer | Uint8Array): string;
/**
 * Convert hex string to ArrayBuffer
 */
export declare function hexToArrayBuffer(hex: string): ArrayBuffer;
/**
 * SHA-256 hash of concatenated public keys for signing
 *
 * @param {CryptoKey[]} publicKeys
 * @returns {Uint8Array}
 */
export declare function preHashPublicKeysForSigning(publicKeys: CryptoKey[]): Promise<Uint8Array<ArrayBuffer>>;
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