import type { VoucherData, VoucherDataInput } from './session-types.js';
/**
 * Constant 2-byte magic prefix of the signed voucher payload. The on-chain
 * program rejects vouchers without it (`voucherBadMagic`).
 */
export declare const VOUCHER_MAGIC: Readonly<Uint8Array>;
/**
 * Signed voucher as it may arrive on the wire. `cumulative` is the legacy
 * alias for `cumulativeAmount` — the Rust mirror deserializes both (see
 * `VoucherData` in `rust/crates/mpp/src/protocol/intents/session.rs`).
 */
export interface WireSignedVoucher {
    readonly data: {
        readonly channelId: string;
        readonly cumulative?: string | undefined;
        readonly cumulativeAmount?: string | undefined;
        readonly expiresAt: number;
        readonly nonce?: number | undefined;
    };
    readonly signature: string;
}
/**
 * Normalize an inbound signed voucher to the canonical shape: maps the
 * legacy `cumulative` alias onto `cumulativeAmount` and validates that
 * `expiresAt` survived JSON parsing intact. Outbound serialization always
 * uses `cumulativeAmount`.
 */
export declare function normalizeSignedVoucher(signed: WireSignedVoucher): {
    data: VoucherData;
    signature: string;
};
/**
 * Canonical 50-byte payment-channel voucher payload signed by the session
 * key. Accepts the strict `VoucherData` shape used in the protocol types.
 */
export declare function encodeVoucherMessage(voucher: VoucherData): Uint8Array;
/**
 * Variant of {@link encodeVoucherMessage} that accepts the looser input
 * shape used by client helpers (allows `cumulative` alias and string/number
 * amounts).
 */
export declare function encodeVoucherMessageLoose(data: VoucherDataInput): Uint8Array;
/**
 * Verify an Ed25519 voucher signature against the authorized signer.
 * Both the signature and signer are base58-encoded (Solana wire format).
 */
export declare function verifyVoucherSignature(args: {
    readonly signatureBase58: string;
    readonly signerBase58: string;
    readonly voucher: VoucherData;
}): Promise<boolean>;
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