/**
 * Encrypt a plaintext string with a 32-byte Content Key.
 * Returns base64(iv || ciphertext || tag).
 */
export declare function encrypt(plaintext: string, ck: Uint8Array): string;
/**
 * Decrypt a base64(iv || ciphertext || tag) string with a 32-byte Content Key.
 */
export declare function decrypt(ciphertext: string, ck: Uint8Array): string;
/**
 * Encrypt a Uint8Array with a 32-byte Content Key.
 * Returns Uint8Array(iv || ciphertext || tag).
 */
export declare function encryptBlob(data: Uint8Array, ck: Uint8Array): Uint8Array;
/**
 * Decrypt a Uint8Array(iv || ciphertext || tag) with a 32-byte Content Key.
 */
export declare function decryptBlob(encrypted: Uint8Array, ck: Uint8Array): Uint8Array;
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