Export minimal key for autocrypt feature (just 5 packets: key, uid, signature, encryption subkey, signature)

# rnp_key_export_autocrypt

(PECL rnp >= 0.1.1)

rnp_key_export_autocrypt — Export minimal key for autocrypt feature (just 5 packets: key, uid, signature, encryption subkey, signature)

### Description

rnp_key_export_autocrypt(
RnpFFI `$ffi`,
string `$key_fp`,
string `$subkey_fp`,
string `$uid`,
int `$flags`
): string|false

### Parameters

`ffi`
  The FFI object returned by rnp_ffi_create().
`key_fp`
  Primary key fingerprint.
`subkey_fp`
  Subkey to export. Can be an empty string to pick the first suitable subkey.
`uid`
  User ID to export. Can be an empty string if exported key has only one uid.
`flags`
  Only `RNP_KEY_EXPORT_BASE64` is currently supported. Enabling it would export base64-encoded key data instead of binary.

### Return Values

OpenPGP packets of exported key on success or `false` on failure.

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