/**
 * The version of the symmetric cipher.
 * Must fit into 1 byte, so 255 is the maximum allowed enum value.
 */
export declare const SymmetricCipherVersion: {
    readonly UnusedReservedUnauthenticated: 0;
    readonly AesCbcThenHmac: 1;
    readonly AeadWithGroupKey: 2;
    readonly AeadWithSessionKey: 3;
};
export type SymmetricCipherVersion = (typeof SymmetricCipherVersion)[keyof typeof SymmetricCipherVersion];
export type SymmetricAesCipherVersion = typeof SymmetricCipherVersion.UnusedReservedUnauthenticated | typeof SymmetricCipherVersion.AesCbcThenHmac;
export type SymmetricAeadCipherVersion = typeof SymmetricCipherVersion.AeadWithGroupKey | typeof SymmetricCipherVersion.AeadWithSessionKey;
/**
 * Get the SymmetricCipherVersion from either the version byte or the full ciphertext
 */
export declare function getSymmetricCipherVersion(ciphertext: Uint8Array): SymmetricCipherVersion;
/**
 * Get a byte array of length 1 that holds the provided version byte.
 */
export declare function symmetricCipherVersionToUint8Array(version: SymmetricCipherVersion): Uint8Array;