Generate key

# rnp_op_generate_key

(PECL rnp >= 0.1.1)

rnp_op_generate_key — Generate key

### Description

rnp_op_generate_key(
RnpFFI `$ffi`,
string `$userid`,
string `$key_alg`,
string `$sub_alg` = ?,
array `$options` = ?
): string|false

### Parameters

`ffi`
  The FFI object returned by rnp_ffi_create().
`userid`
  PGP User ID - text that is intended to represent the name and email address of the key holder.
`key_alg`
  Primary key algorithm (i.e. 'RSA', 'DSA', etc).
`sub_alg`
  Subkey algorithm. If not set, subkey will not be generated.
`options`
  An associative array with options.

  Key | Data type | Description
  --- | --- | ---
  `"bits"` | integer | Primary key size in bits. Applicable only to RSA, DSA and El-Gamal keys.
  `"hash"` | string | Hash algorithm used in self signature or subkey binding signature.
  `"dsa_qbits"` | integer | Set size of a `q` parameter for DSA key. Note: appropriate default value will be set, depending on key bits. However you may override it if needed.
  `"curve"` | string | Set the curve used for ECC key. Note: this is only applicable for ECDSA, ECDH and SM2 keys.
  `"request_password"` | boolean | Enable requesting password via password provider. This password will be used for key encryption. Password provider callback function should be set in advance by calling rnp_ffi_set_pass_provider(). Note: this setting will be ignored if password was set via`"password"`
  `"password"` | string | Set the password used to encrypt the secret key data.
  `"expiration"` | integer | Set the key and subkey expiration time in seconds.
  `"sub_bits"` | integer | Subkey size in bits. Applicable only to RSA, DSA and El-Gamal keys.
  `"sub_hash"` | string | Hash algorithm used in subkey self signature or subkey binding signature.
  `"sub_curve"` | string | Set the curve used for ECC subkey. Note: this is only applicable for ECDSA, ECDH and SM2 keys.

### Return Values

Fingerprint of the generated primary key or `false` on failure. This fingerprint can be used later to reference the key in sign and encrypt operations. The key data is stored in FFI memory context and can be saved using rnp_save_keys() or rnp_save_keys_to_path().

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