import { Principal } from "@dfinity/principal";
/**
 * Address bytes used by the IC canisters.
 * @remarks This is the 20-byte EVM address in binary form.
 */
export type Address = Uint8Array;
/**
 * Derive an EVM address (20 bytes) from a secp256k1 private key (32 bytes).
 * @throws If the private key is not 32 bytes.
 */
export declare function deriveAddress(privateKey: Uint8Array): Address;
/**
 * Build the human-readable authorization message for IC stealth key requests.
 * @remarks This text is wrapped with EIP-191 prefixing in {@link authorizationMessage}.
 */
export declare function authorizationMessageText(canisterId: Principal, address: Address, transportPublicKey: Uint8Array, expiryNs: bigint, nonce: bigint): string;
/**
 * Build the EIP-191 encoded authorization message bytes to sign.
 */
export declare function authorizationMessage(canisterId: Principal, address: Address, transportPublicKey: Uint8Array, expiryNs: bigint, nonce: bigint): Uint8Array;
/**
 * Sign an authorization message using secp256k1.
 * @remarks
 * Returns a 65-byte signature where the last byte is the recovery id + 27.
 * @throws If `message` is empty or `privateKey` is not 32 bytes.
 */
export declare function signAuthorization(message: Uint8Array, privateKey: Uint8Array): Uint8Array;
/**
 * Current unix timestamp in nanoseconds.
 * @remarks Intended for use with canister request expiries.
 */
export declare function unixTimeNs(): bigint;
export declare function addressToHex(address: Address): string;
/**
 * Decode bytes into a UTF-8 string.
 */
export declare function messageToString(message: Uint8Array): string;
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