export declare function encodeBase64Url(value: Uint8Array | string): string;
export declare function decodeBase64Url(value: string): Buffer;
export declare function canonicalJson(value: unknown): string;
export declare function hChaCha20(key: Uint8Array, nonce: Uint8Array): Buffer;
export interface XChaChaCiphertext {
    nonce: string;
    ciphertext: string;
}
export declare function encryptXChaCha20Poly1305(key: Uint8Array, plaintext: Uint8Array | string, aad: Uint8Array | string, nonce?: Uint8Array): XChaChaCiphertext;
export declare function decryptXChaCha20Poly1305(key: Uint8Array, input: XChaChaCiphertext, aad: Uint8Array | string): Buffer;
export declare function encryptLedgerPayload(key: Uint8Array, plaintext: Uint8Array | string, aad: Uint8Array | string, nonce?: Uint8Array, availableCiphers?: readonly string[]): XChaChaCiphertext;
export declare function decryptLedgerPayload(key: Uint8Array, input: XChaChaCiphertext, aad: Uint8Array | string): Buffer;
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