# Method Crypto.RSA()->set_private_key()

Method set_private_key

  ``this_program` set_private_key(`Gmp.mpz`|`int` `priv`, `array`(`Gmp.mpz`|`int`)|`void` `extra`)`

Description

  Sets the private key.

Parameter `priv`

  The private RSA exponent, often called d.

Parameter `extra`

  Array
  ``Gmp.mpz`|`int` `0`` | The first prime, often called p.
  ``Gmp.mpz`|`int` `1`` | The second prime, often called q.