encfs/encfs/config.proto

message EncfsConfig
{
    optional string creator = 1;
    optional int32 revision = 2 [default=0];

    required Interface cipher = 3;
    required EncryptedKey key = 4;
    
    optional Interface naming = 5;
    optional bool unique_iv = 51 [default=false];
    optional bool chained_iv = 52 [default=false];
    optional bool external_iv = 53 [default=false];

    required int32 block_size = 6;
    optional int32 block_mac_bytes = 61 [default=0];
    optional int32 block_mac_rand_bytes = 611 [default=0];
    optional bool allow_holes = 62 [default = false];
}

message EncryptedKey
{
    required bytes ciphertext = 1;
    required int32 size = 2;    // Size of data in bytes

    optional bytes salt = 6;

    optional int32 kdf_iterations = 10;
    optional int32 kdf_duration = 11 [default=500];
}

message Interface
{
    required string name = 1;
    required uint32 major = 2; // major version number
    required uint32 minor = 3; // minor version number

    // Age indicates number of major versions supported. 0 means no backward
    // compatibility.  See libtool "updating version information" for more
    // details on how major/minor/age are used for versioning libraries.
    optional uint32 age = 4; 
}