Module java.base
Package javax.crypto

Class KeyGeneratorSpi

  • public abstract class KeyGeneratorSpi
    extends Object
    This class defines the Service Provider Interface (SPI) for the KeyGenerator class. All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a key generator for a particular algorithm.

    In case the client does not explicitly initialize the KeyGenerator (via a call to an init method), each provider must supply (and document) a default initialization. See the Keysize Restriction sections of the JDK Providers document for information on the KeyGenerator defaults used by JDK providers. However, note that defaults may vary across different providers. Additionally, the default value for a provider may change in a future version. Therefore, it is recommended to explicitly initialize the KeyGenerator instead of relying on provider-specific defaults.

    See Also:
    • Constructor Detail

      • KeyGeneratorSpi

        public KeyGeneratorSpi()
    • Method Detail

      • engineInit

        protected abstract void engineInit​(SecureRandom random)
        Initializes the key generator.
        random - the source of randomness for this generator
      • engineInit

        protected abstract void engineInit​(int keysize,
                                           SecureRandom random)
        Initializes this key generator for a certain keysize, using the given source of randomness.
        keysize - the keysize. This is an algorithm-specific metric, specified in number of bits.
        random - the source of randomness for this key generator
        InvalidParameterException - if the keysize is wrong or not supported.
      • engineGenerateKey

        protected abstract SecretKey engineGenerateKey()
        Generates a secret key.
        the new key