export declare function generateMailboxId(): string;
export declare function generateMessageId(): string;
export declare function generateAgreementId(): string;
export declare function generateIdentityKeyPair(): {
    publicKey: string;
    privateKey: string;
};
export declare function generateExchangeKeyPair(): {
    publicKey: string;
    privateKey: string;
};
export interface EncryptedPackage {
    encrypted_key: string;
    nonce: string;
    auth_tag: string;
    ciphertext: string;
}
export declare function encryptBody(plaintext: string, recipientPublicKeyBase64: string, senderPrivateKeyBase64: string): string;
export declare function decryptBody(encryptedPackageBase64: string, recipientPrivateKeyBase64: string, senderPublicKeyBase64: string): string;
export declare function signMessage(headerJson: string, bodyCiphertext: string, privateKeyPem: string): string;
export declare function verifySignature(headerJson: string, bodyCiphertext: string, signature: string, publicKeyPem: string): boolean;
export declare function computeChainHash(chain: string[]): string;
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