/**
 * Utilities common to Olm encryption
 */
export declare enum EncryptionAlgorithmId {
    Olm = "r.olm.v1.curve25519-aes-sha2"
}
export declare enum GroupEncryptionAlgorithmId {
    GroupEncryption = "r.group-encryption.v1.aes-sha2",
    HybridGroupEncryption = "grpaes"
}
export declare function isGroupEncryptionAlgorithmId(value: string): value is GroupEncryptionAlgorithmId;
type Matched = {
    kind: 'matched';
    value: GroupEncryptionAlgorithmId;
};
type Unrecognized = {
    kind: 'unrecognized';
    value: string;
};
export declare function parseGroupEncryptionAlgorithmId(value: string, defaultValue?: GroupEncryptionAlgorithmId): Matched | Unrecognized;
export interface UserDevice {
    deviceKey: string;
    fallbackKey: string;
}
export interface UserDeviceCollection {
    [userId: string]: UserDevice[];
}
export interface GroupEncryptionSession {
    streamId: string;
    sessionId: string;
    sessionKey: string;
    algorithm: GroupEncryptionAlgorithmId;
}
export {};
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