18.04.2020

Java Key Pair Generator Algorithms

Java Key Pair Generator Algorithms Examples
Java Key Pair Generator Algorithms List

This class defines the Service Provider Interface (SPI) for the KeyPairGenerator class, which is used to generate pairs of public and private keys.

The genKeyPair method of java.security.KeyPairGenerator class is used to generate a key pair. If this KeyPairGenerator has not been initialized explicitly, provider-specific defaults will be used for the size and other (algorithm-specific) values of the generated keys. This will generate a new key pair every time it is called. Not all key generation methods are created equal, and you may want to explicitly choose e.g. The key generation method of a provider. This is especially of use for providers for security tokens. For AES though, the random number generator may be of more importance - you may for instance want to use a slower, more secure, FIPS certified random number generator instead of the. Generate Key Pair. Generating a public key / private key pair is one of the most common tasks to use the Java Keytool for. The generated key pair is inserted into a Java KeyStore file as a self signed key pair. Here is the general command line format for generating a key pair with the Keytool.

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All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a key pair generator for a particular algorithm.

In case the client does not explicitly initialize the KeyPairGenerator (via a call to an initialize method), each provider must supply (and document) a default initialization. For example, the Sun provider uses a default modulus size (keysize) of 1024 bits.

See Also:: KeyPairGenerator, AlgorithmParameterSpec

Constructor Summary
`KeyPairGeneratorSpi()`

Public abstract class KeyPairGeneratorSpi extends Object. This class defines the Service Provider Interface (SPI) for the KeyPairGenerator class, which is used to generate pairs of public and private keys. All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a key pair generator for a particular algorithm. GetInstance(String) GetInstance(String) Returns a new instance of KeyPairGenerator that utilizes the specified algorithm. GetInstance(String, Provider) GetInstance(String, Provider) Returns a new instance of KeyPairGenerator that utilizes the specified algorithm from the specified provider. GetInstance(String, String) GetInstance(String, String) Returns a new instance of.

Method Summary
`abstract KeyPair`	`generateKeyPair()` Generates a key pair.
`void`	`initialize(AlgorithmParameterSpec params, SecureRandom random)` Initializes the key pair generator using the specified parameter set and user-provided source of randomness.
`abstract void`	`initialize(int keysize, SecureRandom random)` Initializes the key pair generator for a certain keysize, using the default parameter set.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

KeyPairGeneratorSpi

Method Detail

initialize

Java Key Pair Generator Algorithms Examples

Initializes the key pair generator for a certain keysize, using the default parameter set.

Parameters:: keysize - the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits.; random - the source of randomness for this generator.
Throws:: InvalidParameterException - if the keysize is not supported by this KeyPairGeneratorSpi object.

initialize

Initializes the key pair generator using the specified parameter set and user-provided source of randomness.

This concrete method has been added to this previously-defined abstract class. (For backwards compatibility, it cannot be abstract.) It may be overridden by a provider to initialize the key pair generator. Such an override is expected to throw an InvalidAlgorithmParameterException if a parameter is inappropriate for this key pair generator. If this method is not overridden, it always throws an UnsupportedOperationException.

Parameters:: params - the parameter set used to generate the keys.; random - the source of randomness for this generator.
Throws:: InvalidAlgorithmParameterException - if the given parameters are inappropriate for this key pair generator.
Since:: 1.2

generateKeyPair

Generates a key pair. Unless an initialization method is called using a KeyPairGenerator interface, algorithm-specific defaults will be used. This will generate a new key pair every time it is called.

Returns:: the newly generated KeyPair

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Java Key Pair Generator Algorithms List

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.