/**
 * EHBP error hierarchy:
 *
 *   EhbpError (base)
 *   ├── KeyConfigMismatchError  - 422 key-config mismatch (stale key after rotation)
 *   ├── ProtocolError           - Malformed framing or crypto setup failure
 *   └── DecryptionError         - AEAD authentication / decryption failure
 */
export declare class EhbpError extends Error {
    constructor(message: string, options?: {
        cause?: unknown;
    });
}
/**
 * Server returned 422 with problem+json key-config mismatch.
 * The request was never processed — re-sending after re-keying is safe.
 */
export declare class KeyConfigMismatchError extends EhbpError {
    readonly title: string;
    constructor(title?: string);
}
export declare class ProtocolError extends EhbpError {
    constructor(message: string, options?: {
        cause?: unknown;
    });
}
export declare class DecryptionError extends EhbpError {
    constructor(message: string, options?: {
        cause?: unknown;
    });
}
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