/**
 * Provides encryption and decryption methods with a consistent API but
 * differing mechanisms for dealing with encryption keys.
 */
export { KMS } from './kms';
/**
 * Provides encryption and decryption methods using a keypair stored in S3
 */
export declare class S3KeyPairProvider {
    /**
     * Encrypt the given string using the given public key stored in the system_bucket.
     *
     * @param {string} str - The string to encrypt
     * @param {string} [keyId] - The name of the public key to use for encryption
     * @param {string} [bucket] - the optional bucket name. if not provided will
     *                          use env variable "system_bucket"
     * @param {stack} [stack] - the optional stack name. if not provided will
     *                        use env variable "stackName"
     * @returns {Promise.<string>} the encrypted string
     */
    static encrypt(str: string, keyId?: string, bucket?: string, stack?: string): Promise<string>;
    /**
     * Decrypt the given string using a private key stored in S3
     *
     * @param {string} str - The string to decrypt
     * @param {string} [keyId] - The name of the public key to use for decryption
     * @param {string} [bucket] - the optional bucket name. Defaults to the value
     *   of the "system_bucket" environment variable
     * @param {string} [stack] - the optional stack name. Defaults to the value of
     *   the "stackName" environment variable
     * @returns {Promise.<string>} the decrypted string
     */
    static decrypt(str: string, keyId?: string, bucket?: string, stack?: string): Promise<string>;
}
export { S3KeyPairProvider as DefaultProvider };
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