The KeyPairGenerator class is used to generate pairs of public and private keys. Key pair generators are constructed using the getInstance factory methods (static methods that return instances of a given class).

A Key pair generator for a particular algorithm creates a public/private key pair that can be used with this algorithm. It also associates algorithm-specific parameters with each of the generated keys.

There are two ways to generate a key pair: in an algorithm-independent manner, and in an algorithm-specific manner. The only difference between the two is the initialization of the object:

Algorithm-Independent Initialization
All key pair generators share the concepts of a keysize and a source of randomness. The keysize is interpreted differently for different algorithms (e.g., in the case of the DSA algorithm, the keysize corresponds to the length of the modulus). There is an initialize method in this KeyPairGenerator class that takes these two universally shared types of arguments. There is also one that takes just a keysize argument, and uses the SecureRandom implementation of the highest-priority installed provider as the source of randomness. (If none of the installed providers supply an implementation of SecureRandom, a system-provided source of randomness is used.)
Since no other parameters are specified when you call the above algorithm-independent initialize methods, it is up to the provider what to do about the algorithm-specific parameters (if any) to be associated with each of the keys.
If the algorithm is the DSA algorithm, and the keysize (modulus size) is 512, 768, 1024, or 2048, then the Sun provider uses a set of precomputed values for the p, q, and g parameters. If the modulus size is not one of the above values, the Sun provider creates a new set of parameters. Other providers might have precomputed parameter sets for more than just the modulus sizes mentioned above. Still others might not have a list of precomputed parameters at all and instead always create new parameter sets.
Algorithm-Specific Initialization
For situations where a set of algorithm-specific parameters already exists (e.g., so-called community parameters in DSA), there are two initialize methods that have an AlgorithmParameterSpec argument. One also has a SecureRandom argument, while the other uses the SecureRandom implementation of the highest-priority installed provider as the source of randomness. (If none of the installed providers supply an implementation of SecureRandom, a system-provided source of randomness is used.)

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. See the Keysize Restriction sections of the JDK Providers document for information on the KeyPairGenerator 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 KeyPairGenerator instead of relying on provider-specific defaults.

Note that this class is abstract and extends from KeyPairGeneratorSpi for historical reasons. Application developers should only take notice of the methods defined in this KeyPairGenerator class; all the methods in the superclass are intended for cryptographic service providers who wish to supply their own implementations of key pair generators.

Every implementation of the Java platform is required to support the following standard KeyPairGenerator algorithms and keysizes in parentheses:

DiffieHellman (1024, 2048, 4096)
DSA (1024, 2048)
RSA (1024, 2048, 4096)

These algorithms are described in the KeyPairGenerator section of the Java Security Standard Algorithm Names Specification. Consult the release documentation for your implementation to see if any other algorithms are supported.

Nested and Inner Type Summary

Modifier and Type	Class and Description
private static class	KeyPairGenerator.Delegate

Field Summary

Modifier and Type	Field and Description
private final String	algorithm
private static final Debug	pdebug
pack-priv Provider	provider
private static final boolean	skipDebug

Access	Constructor and Description
protected	KeyPairGenerator(String the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names. algorithm) Creates a `KeyPairGenerator` object for the specified algorithm.

Method Summary

Modifier and Type	Method and Description
pack-priv void	disableFailover()
public KeyPair	Returns: the generated key pair generateKeyPair() Implements abstract java.security.KeyPairGeneratorSpi.generateKeyPair. Generates a key pair.
public final KeyPair	Returns: the generated key pair genKeyPair() Generates a key pair.
public String	Returns: the standard string name of the algorithm. getAlgorithm() Returns the standard name of the algorithm for this key pair generator.
private static KeyPairGenerator	getInstance(GetInstance.Instance instance, String algorithm)
public static KeyPairGenerator	Returns: the new `KeyPairGenerator` object getInstance(String the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names. algorithm) Returns a `KeyPairGenerator` object that generates public/private key pairs for the specified algorithm.
public static KeyPairGenerator	Returns: the new `KeyPairGenerator` object getInstance(String the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names. algorithm, String the string name of the provider. provider) Returns a `KeyPairGenerator` object that generates public/private key pairs for the specified algorithm.
public static KeyPairGenerator	Returns: the new `KeyPairGenerator` object getInstance(String the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names. algorithm, Provider the provider. provider) Returns a `KeyPairGenerator` object that generates public/private key pairs for the specified algorithm.
public final Provider	Returns: the provider of this key pair generator object getProvider() Returns the provider of this key pair generator object.
public void	initialize(int the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits. keysize) Initializes the key pair generator for a certain keysize using a default parameter set and the `SecureRandom` implementation of the highest-priority installed provider as the source of randomness.
public void	initialize(int the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits. keysize, SecureRandom the source of randomness. random) Implements abstract java.security.KeyPairGeneratorSpi.initialize. Initializes the key pair generator for a certain keysize with the given source of randomness (and a default parameter set).
public void	initialize(AlgorithmParameterSpec the parameter set used to generate the keys. params) Initializes the key pair generator using the specified parameter set and the `SecureRandom` implementation of the highest-priority installed provider as the source of randomness.
public void	initialize(AlgorithmParameterSpec the parameter set used to generate the keys. params, SecureRandom the source of randomness. random) Overrides java.security.KeyPairGeneratorSpi.initialize. Initializes the key pair generator with the given parameter set and source of randomness.

Field Detail

algorithm	back to summary
private final String algorithm

pdebug	back to summary
private static final Debug pdebug

provider	back to summary
pack-priv Provider provider

skipDebug	back to summary
private static final boolean skipDebug

Constructor Detail

KeyPairGenerator back to summary

KeyPairGenerator	back to summary
protected KeyPairGenerator(String algorithm) Creates a `KeyPairGenerator` object for the specified algorithm. Parameters algorithm:String the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names.

protected KeyPairGenerator(String algorithm)

Creates a KeyPairGenerator object for the specified algorithm.

Parameters

algorithm:String: the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names.

Method Detail

disableFailover	back to summary
pack-priv void disableFailover()

generateKeyPair back to summary

generateKeyPair	back to summary
public KeyPair generateKeyPair() Implements abstract java.security.KeyPairGeneratorSpi.generateKeyPair. Generates 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. This method is functionally equivalent to `genKeyPair`. Returns:KeyPair the generated key pair

public KeyPair generateKeyPair()

Implements abstract java.security.KeyPairGeneratorSpi.generateKeyPair.

Generates 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.

This method is functionally equivalent to genKeyPair.

Returns:KeyPair: the generated key pair

genKeyPair back to summary

genKeyPair	back to summary
public final KeyPair genKeyPair() Generates 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. This method is functionally equivalent to `generateKeyPair`. Returns:KeyPair the generated key pair Since 1.2

public final KeyPair genKeyPair()

Generates 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.

This method is functionally equivalent to generateKeyPair.

Returns:KeyPair: the generated key pair
Since: 1.2

getAlgorithm	back to summary
public String getAlgorithm() Returns the standard name of the algorithm for this key pair generator. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names. Returns:String the standard string name of the algorithm.

getAlgorithm

back to summary

public String getAlgorithm()

Returns the standard name of the algorithm for this key pair generator. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names.

Returns:String: the standard string name of the algorithm.

getInstance	back to summary
private static KeyPairGenerator getInstance(GetInstance.Instance instance, String algorithm)

getInstance back to summary

getInstance	back to summary
public static KeyPairGenerator getInstance(String algorithm) throws NoSuchAlgorithmException Returns a `KeyPairGenerator` object that generates public/private key pairs for the specified algorithm. This method traverses the list of registered security Providers, starting with the most preferred Provider. A new `KeyPairGenerator` object encapsulating the `KeyPairGeneratorSpi` implementation from the first provider that supports the specified algorithm is returned. Note that the list of registered providers may be retrieved via the `Security.getProviders()` method. Implementation Note The JDK Reference Implementation additionally uses the `jdk.security.provider.preferred` `Security` property to determine the preferred provider order for the specified algorithm. This may be different from the order of providers returned by `Security.getProviders()`. Parameters algorithm:String the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names. Returns:KeyPairGenerator the new `KeyPairGenerator` object Exceptions NoSuchAlgorithmException: if no `Provider` supports a `KeyPairGeneratorSpi` implementation for the specified algorithm NullPointerException: if `algorithm` is `null` See Also `Provider`

public static KeyPairGenerator getInstance(String algorithm) throws NoSuchAlgorithmException

Returns a KeyPairGenerator object that generates public/private key pairs for the specified algorithm.

This method traverses the list of registered security Providers, starting with the most preferred Provider. A new KeyPairGenerator object encapsulating the KeyPairGeneratorSpi implementation from the first provider that supports the specified algorithm is returned.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

Implementation Note

The JDK Reference Implementation additionally uses the jdk.security.provider.preferred Security property to determine the preferred provider order for the specified algorithm. This may be different from the order of providers returned by Security.getProviders().

Parameters

algorithm:String: the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names.

Returns:KeyPairGenerator

the new KeyPairGenerator object

Exceptions

NoSuchAlgorithmException:: if no Provider supports a KeyPairGeneratorSpi implementation for the specified algorithm
NullPointerException:: if algorithm is null

See Also

Provider

getInstance back to summary

getInstance	back to summary
public static KeyPairGenerator getInstance(String algorithm, String provider) throws NoSuchAlgorithmException, NoSuchProviderException Returns a `KeyPairGenerator` object that generates public/private key pairs for the specified algorithm. A new `KeyPairGenerator` object encapsulating the `KeyPairGeneratorSpi` implementation from the specified provider is returned. The specified provider must be registered in the security provider list. Note that the list of registered providers may be retrieved via the `Security.getProviders()` method. Parameters algorithm:String the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names. provider:String the string name of the provider. Returns:KeyPairGenerator the new `KeyPairGenerator` object Exceptions NoSuchAlgorithmException: if a `KeyPairGeneratorSpi` implementation for the specified algorithm is not available from the specified provider NoSuchProviderException: if the specified provider is not registered in the security provider list IllegalArgumentException: if the provider name is `null` or empty NullPointerException: if `algorithm` is `null` See Also `Provider`

public static KeyPairGenerator getInstance(String algorithm, String provider) throws NoSuchAlgorithmException, NoSuchProviderException

Returns a KeyPairGenerator object that generates public/private key pairs for the specified algorithm.

A new KeyPairGenerator object encapsulating the KeyPairGeneratorSpi implementation from the specified provider is returned. The specified provider must be registered in the security provider list.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

Parameters

algorithm:String: the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names.
provider:String: the string name of the provider.

Returns:KeyPairGenerator

the new KeyPairGenerator object

Exceptions

NoSuchAlgorithmException:: if a KeyPairGeneratorSpi implementation for the specified algorithm is not available from the specified provider
NoSuchProviderException:: if the specified provider is not registered in the security provider list
IllegalArgumentException:: if the provider name is null or empty
NullPointerException:: if algorithm is null

See Also

Provider

getInstance back to summary

getInstance	back to summary
public static KeyPairGenerator getInstance(String algorithm, Provider provider) throws NoSuchAlgorithmException Returns a `KeyPairGenerator` object that generates public/private key pairs for the specified algorithm. A new `KeyPairGenerator` object encapsulating the `KeyPairGeneratorSpi` implementation from the specified provider is returned. Note that the specified provider does not have to be registered in the provider list. Parameters algorithm:String the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names. provider:Provider the provider. Returns:KeyPairGenerator the new `KeyPairGenerator` object Exceptions NoSuchAlgorithmException: if a `KeyPairGeneratorSpi` implementation for the specified algorithm is not available from the specified `Provider` object IllegalArgumentException: if the specified provider is `null` NullPointerException: if `algorithm` is `null` Since 1.4 See Also `Provider`

public static KeyPairGenerator getInstance(String algorithm, Provider provider) throws NoSuchAlgorithmException

Returns a KeyPairGenerator object that generates public/private key pairs for the specified algorithm.

A new KeyPairGenerator object encapsulating the KeyPairGeneratorSpi implementation from the specified provider is returned. Note that the specified provider does not have to be registered in the provider list.

Parameters

algorithm:String: the standard string name of the algorithm. See the KeyPairGenerator section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names.
provider:Provider: the provider.

Returns:KeyPairGenerator

the new KeyPairGenerator object

Exceptions

NoSuchAlgorithmException:: if a KeyPairGeneratorSpi implementation for the specified algorithm is not available from the specified Provider object
IllegalArgumentException:: if the specified provider is null
NullPointerException:: if algorithm is null

Since

1.4

See Also

Provider

getProvider	back to summary
public final Provider getProvider() Returns the provider of this key pair generator object. Returns:Provider the provider of this key pair generator object

getProvider

back to summary

public final Provider getProvider()

Returns the provider of this key pair generator object.

Returns:Provider: the provider of this key pair generator object

initialize back to summary

initialize	back to summary
public void initialize(int keysize) Initializes the key pair generator for a certain keysize using a default parameter set and the `SecureRandom` implementation of the highest-priority installed provider as the source of randomness. (If none of the installed providers supply an implementation of `SecureRandom`, a system-provided source of randomness is used.) Parameters keysize:int the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits. Exceptions InvalidParameterException: if the `keysize` is not supported by this `KeyPairGenerator` object.

public void initialize(int keysize)

Initializes the key pair generator for a certain keysize using a default parameter set and the SecureRandom implementation of the highest-priority installed provider as the source of randomness. (If none of the installed providers supply an implementation of SecureRandom, a system-provided source of randomness is used.)

Parameters

keysize:int: the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits.

Exceptions

InvalidParameterException:: if the keysize is not supported by this KeyPairGenerator object.

initialize back to summary

initialize	back to summary
public void initialize(int keysize, SecureRandom random) Implements abstract java.security.KeyPairGeneratorSpi.initialize. Initializes the key pair generator for a certain keysize with the given source of randomness (and a default parameter set). Parameters keysize:int the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits. random:SecureRandom the source of randomness. Exceptions InvalidParameterException: if the `keysize` is not supported by this `KeyPairGenerator` object. Since 1.2

public void initialize(int keysize, SecureRandom random)

Implements abstract java.security.KeyPairGeneratorSpi.initialize.

Initializes the key pair generator for a certain keysize with the given source of randomness (and a default parameter set).

Parameters

keysize:int: the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits.
random:SecureRandom: the source of randomness.

Exceptions

InvalidParameterException:: if the keysize is not supported by this KeyPairGenerator object.

Since

1.2

initialize back to summary

initialize	back to summary
public void initialize(AlgorithmParameterSpec params) throws InvalidAlgorithmParameterException Initializes the key pair generator using the specified parameter set and the `SecureRandom` implementation of the highest-priority installed provider as the source of randomness. (If none of the installed providers supply an implementation of `SecureRandom`, a system-provided source of randomness is used.) This concrete method has been added to this previously-defined abstract class. This method calls the KeyPairGeneratorSpi `initialize` method, passing it `params` and a source of randomness (obtained from the highest-priority installed provider or system-provided if none of the installed providers supply one). That `initialize` method always throws an `UnsupportedOperationException` if it is not overridden by the provider. Parameters params:AlgorithmParameterSpec the parameter set used to generate the keys. Exceptions InvalidAlgorithmParameterException: if the given parameters are inappropriate for this key pair generator. Since 1.2

public void initialize(AlgorithmParameterSpec params) throws InvalidAlgorithmParameterException

Initializes the key pair generator using the specified parameter set and the SecureRandom implementation of the highest-priority installed provider as the source of randomness. (If none of the installed providers supply an implementation of SecureRandom, a system-provided source of randomness is used.)

This concrete method has been added to this previously-defined abstract class. This method calls the KeyPairGeneratorSpi initialize method, passing it params and a source of randomness (obtained from the highest-priority installed provider or system-provided if none of the installed providers supply one). That initialize method always throws an UnsupportedOperationException if it is not overridden by the provider.

Parameters

params:AlgorithmParameterSpec: the parameter set used to generate the keys.

Exceptions

InvalidAlgorithmParameterException:: if the given parameters are inappropriate for this key pair generator.

Since

1.2

initialize back to summary

initialize	back to summary
public void initialize(AlgorithmParameterSpec params, SecureRandom random) throws InvalidAlgorithmParameterException Overrides java.security.KeyPairGeneratorSpi.initialize. Initializes the key pair generator with the given parameter set and source of randomness. This concrete method has been added to this previously-defined abstract class. This method calls the KeyPairGeneratorSpi `initialize` method, passing it `params` and `random`. That `initialize` method always throws an `UnsupportedOperationException` if it is not overridden by the provider. Parameters params:AlgorithmParameterSpec the parameter set used to generate the keys. random:SecureRandom the source of randomness. Exceptions InvalidAlgorithmParameterException: if the given parameters are inappropriate for this key pair generator. Since 1.2

public void initialize(AlgorithmParameterSpec params, SecureRandom random) throws InvalidAlgorithmParameterException

Overrides java.security.KeyPairGeneratorSpi.initialize.

Initializes the key pair generator with the given parameter set and source of randomness.

This concrete method has been added to this previously-defined abstract class. This method calls the KeyPairGeneratorSpi initialize method, passing it params and random. That initialize method always throws an UnsupportedOperationException if it is not overridden by the provider.

Parameters

params:AlgorithmParameterSpec: the parameter set used to generate the keys.
random:SecureRandom: the source of randomness.

Exceptions

InvalidAlgorithmParameterException:: if the given parameters are inappropriate for this key pair generator.

Since

1.2

java.security back to summary

private final Class KeyPairGenerator.Delegate

Class Inheritance

extends KeyPairGenerator

Field Summary

Modifier and Type	Field and Description
private static final int	I_NONE
private static final int	I_PARAMS
private static final int	I_SIZE
private int	initKeySize
private AlgorithmParameterSpec	initParams
private SecureRandom	initRandom
private int	initType
private final Object	lock
private Iterator<Provider.Service>	serviceIterator
private volatile KeyPairGeneratorSpi	spi

Inherited from java.security.KeyPairGenerator:: provider

Constructor Summary

Access	Constructor and Description
pack-priv	Delegate(KeyPairGeneratorSpi spi, String algorithm)
pack-priv	Delegate(GetInstance.Instance instance, Iterator<Provider.Service> serviceIterator, String algorithm)

Method Summary

Modifier and Type	Method and Description
pack-priv void	disableFailover() Overrides java.security.KeyPairGenerator.disableFailover.
public KeyPair	generateKeyPair() Overrides java.security.KeyPairGenerator.generateKeyPair. Generates a key pair.
public void	initialize(int the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits. keysize, SecureRandom the source of randomness. random) Overrides java.security.KeyPairGenerator.initialize. Initializes the key pair generator for a certain keysize with the given source of randomness (and a default parameter set).
public void	initialize(AlgorithmParameterSpec the parameter set used to generate the keys. params, SecureRandom the source of randomness. random) Overrides java.security.KeyPairGenerator.initialize. Initializes the key pair generator with the given parameter set and source of randomness.
private KeyPairGeneratorSpi	nextSpi(KeyPairGeneratorSpi oldSpi, boolean reinit) Update the active spi of this class and return the next implementation for failover.

Inherited from java.security.KeyPairGenerator:: genKeyPair getAlgorithm getInstance getInstance getInstance getProvider initialize initialize

Field Detail

I_NONE	back to summary
private static final int I_NONE

I_PARAMS	back to summary
private static final int I_PARAMS

I_SIZE	back to summary
private static final int I_SIZE

initKeySize	back to summary
private int initKeySize

initParams	back to summary
private AlgorithmParameterSpec initParams

initRandom	back to summary
private SecureRandom initRandom

initType	back to summary
private int initType

lock	back to summary
private final Object lock

serviceIterator	back to summary
private Iterator<Provider.Service> serviceIterator

spi	back to summary
private volatile KeyPairGeneratorSpi spi

Constructor Detail

Delegate	back to summary
pack-priv Delegate(KeyPairGeneratorSpi spi, String algorithm)

Delegate	back to summary
pack-priv Delegate(GetInstance.Instance instance, Iterator<Provider.Service> serviceIterator, String algorithm)

Method Detail

disableFailover	back to summary
pack-priv void disableFailover() Overrides java.security.KeyPairGenerator.disableFailover.

generateKeyPair back to summary

generateKeyPair	back to summary
public KeyPair generateKeyPair() Overrides java.security.KeyPairGenerator.generateKeyPair. Doc from java.security.KeyPairGenerator.generateKeyPair. Generates 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. This method is functionally equivalent to `genKeyPair`. Returns:KeyPair the generated key pair

public KeyPair generateKeyPair()

Overrides java.security.KeyPairGenerator.generateKeyPair.

Doc from java.security.KeyPairGenerator.generateKeyPair.

Generates 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.

This method is functionally equivalent to genKeyPair.

Returns:KeyPair: the generated key pair

initialize	back to summary
public void initialize(int keysize, SecureRandom random) Overrides java.security.KeyPairGenerator.initialize. Doc from java.security.KeyPairGenerator.initialize. Initializes the key pair generator for a certain keysize with the given source of randomness (and a default parameter set). Parameters keysize:int the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits. random:SecureRandom the source of randomness.

initialize

back to summary

public void initialize(int keysize, SecureRandom random)

Overrides java.security.KeyPairGenerator.initialize.

Doc from java.security.KeyPairGenerator.initialize.

Initializes the key pair generator for a certain keysize with the given source of randomness (and a default parameter set).

Parameters

keysize:int: the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits.
random:SecureRandom: the source of randomness.

initialize back to summary

initialize	back to summary
public void initialize(AlgorithmParameterSpec params, SecureRandom random) throws InvalidAlgorithmParameterException Overrides java.security.KeyPairGenerator.initialize. Doc from java.security.KeyPairGenerator.initialize. Initializes the key pair generator with the given parameter set and source of randomness. This concrete method has been added to this previously-defined abstract class. This method calls the KeyPairGeneratorSpi `initialize` method, passing it `params` and `random`. That `initialize` method always throws an `UnsupportedOperationException` if it is not overridden by the provider. Parameters params:AlgorithmParameterSpec the parameter set used to generate the keys. random:SecureRandom the source of randomness. Exceptions InvalidAlgorithmParameterException: if the given parameters are inappropriate for this key pair generator.

public void initialize(AlgorithmParameterSpec params, SecureRandom random) throws InvalidAlgorithmParameterException

Overrides java.security.KeyPairGenerator.initialize.

Doc from java.security.KeyPairGenerator.initialize.

Initializes the key pair generator with the given parameter set and source of randomness.

Parameters

params:AlgorithmParameterSpec: the parameter set used to generate the keys.
random:SecureRandom: the source of randomness.

Exceptions

InvalidAlgorithmParameterException:: if the given parameters are inappropriate for this key pair generator.

nextSpi	back to summary
private KeyPairGeneratorSpi nextSpi(KeyPairGeneratorSpi oldSpi, boolean reinit) Update the active spi of this class and return the next implementation for failover. If no more implementations are available, this method returns `null`. However, the active spi of this class is never set to `null`.

public abstract Class KeyPairGenerator

Nested and Inner Type Summary

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail

private final Class KeyPairGenerator.Delegate

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail