# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`RNP_KEYSTORE_GPG` (string)
  Keystore format "GPG".
`RNP_KEYSTORE_KBX` (string)
  Keystore format "KBX". For public keys only. A keybox is a file format used to store public keys along with meta information and indices.
`RNP_KEYSTORE_G10` (string)
  Keystore format "G10". For private keys.
`RNP_LOAD_SAVE_PUBLIC_KEYS` (integer)
  Load or save public keys only. Can be OR-ed with `RNP_LOAD_SAVE_SECRET_KEYS` to load both public and private keys to the FFI context or save them from the context.
`RNP_LOAD_SAVE_SECRET_KEYS` (integer)
  Load or save secret keys only. Can be OR-ed with `RNP_LOAD_SAVE_PUBLIC_KEYS` to load both public and private keys to the FFI context or save them from the context.
`RNP_LOAD_SAVE_PERMISSIVE` (integer)
  Allows to ignore bad signature/key/subkey packets during key import.
`RNP_LOAD_SAVE_SINGLE` (integer)
  If set, only the first key will be loaded.
`RNP_LOAD_SAVE_BASE64` (integer)
  Allow import of base64-encoded keys (autocrypt ones).
`RNP_FEATURE_SYMM_ALG` (string)
  List available symmetric encryption algorithms.
`RNP_FEATURE_AEAD_ALG` (string)
  List available AEAD algorithms.
`RNP_FEATURE_PROT_MODE` (string)
  List available protection modes.
`RNP_FEATURE_PK_ALG` (string)
  List available public key algorithms.
`RNP_FEATURE_HASH_ALG` (string)
  List available hash algorithms.
`RNP_FEATURE_COMP_ALG` (string)
  List available compression algorithms.
`RNP_FEATURE_CURVE` (string)
  List available elliptic curves.
`RNP_DUMP_MPI` (integer)
  Dump MPI (Multi-precision integer) values.
`RNP_DUMP_RAW` (integer)
  Dump raw packet contents as well.
`RNP_DUMP_GRIP` (integer)
  Dump key fingerprints and grips.
`RNP_JSON_DUMP_MPI` (integer)
  Dump MPI (Multi-precision integer) values.
`RNP_JSON_DUMP_RAW` (integer)
  Dump raw packet contents as well.
`RNP_JSON_DUMP_GRIP` (integer)
  Dump key fingerprints and grips.
`RNP_ENCRYPT_NOWRAP` (integer)
  Allows encryption of signed message. Message is not wrapped into literal data packet.
`RNP_KEY_EXPORT_ARMORED` (integer)
  Enable ASCII-armoring of exported data.
`RNP_KEY_EXPORT_PUBLIC` (integer)
  Export public key.
`RNP_KEY_EXPORT_SECRET` (integer)
  Export secret key.
`RNP_KEY_EXPORT_SUBKEYS` (integer)
  If primary key is being exported, all subkeys will be exported too.
`RNP_KEY_EXPORT_BASE64` (integer)
  Export base64-encoded autocrypt key instead of binary.
`RNP_KEY_REMOVE_PUBLIC` (integer)
  Remove public key.
`RNP_KEY_REMOVE_SECRET` (integer)
  Remove secret key.
`RNP_KEY_REMOVE_SUBKEYS` (integer)
  If primary key is being deleted, all of its subkeys will be removed too.

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