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net.rim.device.api.crypto
Class DSACryptoSystem

java.lang.Object
  |
  +--net.rim.device.api.crypto.DSACryptoSystem

All Implemented Interfaces:

CryptoSystem, Persistable, net.rim.vm.Persistable

public final class DSACryptoSystem

extends Object

implements CryptoSystem

Represents the system of asymmetric cryptography which is based on the Discrete Logarithm Problem.

The Digital Signature Algorithm ( DSA ) is defined in FIPS 186.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

See Also:

DSAPublicKey, DSAPrivateKey

Field Summary

	static String	SUN1024 Represents the 1024 bit parameters defined in the SUN JCA.
	static String	SUN512 Represents the 512 bit parameters defined in the SUN JCA.
	static String	SUN768 Represents the 768 bit parameters defined in the SUN JCA.

Constructor Summary

	DSACryptoSystem() Creates the DSACryptoSystem object with the specified SUN1024 parameters.
	DSACryptoSystem(byte[] p, byte[] q, byte[] g) Creates a DSACryptoCystem object with the specified p, q and g domain parameters.
	DSACryptoSystem(byte[] p, byte[] q, byte[] g, String name) Creates a DSACryptoSystem object with the specified p, q and g domain parameters.
	DSACryptoSystem(String name) Creates the DSACryptoSystem object using the specified parameters.

Method Summary

	DSAKeyPair	createDSAKeyPair()
	KeyPair	createKeyPair() Creates a new key pair using this crypto system.
	boolean	equals(Object obj) Indicates whether some other object is "equal to" this one.
	String	getAlgorithm() Returns a String that indicates the algorithm, ie "DSA".
	int	getBitLength() Returns the number of bits (aka the "strength") of the crypto system, eg 1024 (for RSA), 163 (for EC).
	byte[]	getG() Returns the g domain parameter.
	String	getName() Returns a String that indicates the set of parameters in use, eg "SUN1024", or null.
	byte[]	getP() Returns the p domain parameter.
	int	getPrivateKeyLength() Returns the length of the private key.
	int	getPublicKeyLength() Returns the length of the public key.
	byte[]	getQ() Returns the q domain parameter, or null.
	int	hashCode() Returns a hash code value for the object.
	boolean	isStrong() Returns whether or not the CryptoSystem is cryptographically strong as of the release date of the code.
	void	verify() Performs integrity checks on the crypto system parameters.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

SUN512

public static final String SUN512

Represents the 512 bit parameters defined in the SUN JCA.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

SUN768

public static final String SUN768

Represents the 768 bit parameters defined in the SUN JCA.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

SUN1024

public static final String SUN1024

Represents the 1024 bit parameters defined in the SUN JCA.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

Constructor Detail

DSACryptoSystem

public DSACryptoSystem()

Creates the DSACryptoSystem object with the specified SUN1024 parameters.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

DSACryptoSystem

public DSACryptoSystem(String name)

Creates the DSACryptoSystem object using the specified parameters.

Parameters:

name - Specifies the parameters to use.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

DSACryptoSystem

public DSACryptoSystem(byte[] p,
                       byte[] q,
                       byte[] g)
                throws InvalidCryptoSystemException,
                       UnsupportedCryptoSystemException

Creates a DSACryptoCystem object with the specified p, q and g domain parameters.

Parameters:

p - The p domain parameter.

q - The q domain parameter.

g - the g domain parameter.

Throws:

InvalidCryptoSystemException - Thrown if any or all of the given parameters are invalid.

UnsupportedCryptoSystemException - Thrown if the specified crypto system is invalid.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

DSACryptoSystem

public DSACryptoSystem(byte[] p,
                       byte[] q,
                       byte[] g,
                       String name)
                throws InvalidCryptoSystemException,
                       UnsupportedCryptoSystemException

Creates a DSACryptoSystem object with the specified p, q and g domain parameters.

Parameters:

p - The p domain parameter.

q - The q domain parameter. May not be null.

g - The g domain parameter.

name - A String containing a description of the parameters, eg "SUN1024".

Throws:

InvalidCryptoSystemException - Thrown if any or all of the given parameters are invalid.

UnsupportedCryptoSystemException - Thrown if the specified crypto system is not supported.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

Method Detail

verify

public void verify()
            throws InvalidCryptoSystemException,
                   CryptoTokenException,
                   CryptoUnsupportedOperationException

Performs integrity checks on the crypto system parameters. Specifically, the following are verified:

• p, q, g > 0
• p is odd, q is odd
• 2¹⁵⁹ < q < 2¹⁶⁰
• 1 < g < p
• q | (p-1)
• g^q mod p = 1

Specified by:

verify in interface CryptoSystem

Throws:

CryptoTokenException - Thrown if an error occurs with the crypto token or the crypto token is invalid.

CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation. Then, the verifyCryptoSystemData method of the associated crypto token is called.

InvalidCryptoSystemException - Thrown if the crypto system parameters are invalid

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

getAlgorithm

public String getAlgorithm()

Returns a String that indicates the algorithm, ie "DSA".

This method will always return the String "DSA".

Specified by:

getAlgorithm in interface CryptoSystem

Returns:

A string representing the name of the algorithm.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

getBitLength

public int getBitLength()
                 throws CryptoTokenException,
                        CryptoUnsupportedOperationException

Description copied from interface: CryptoSystem

Returns the number of bits (aka the "strength") of the crypto system, eg 1024 (for RSA), 163 (for EC).

Note: the strength of a CryptoSystem is a combination of the algorithm and the bit length. For example, a 1024 bit RSA CryptoSystem is estimated to have the same cryptographic strength as 160 bit EC CryptoSystem.

Specified by:

getBitLength in interface CryptoSystem

Following copied from interface: net.rim.device.api.crypto.CryptoSystem

Returns:

An integer that represents the number of bits.

Throws:

CryptoTokenException - Thrown when a problem occurs with a crypto token or the crypto token is invalid.

CryptoUnsupportedOperationException - Thrown when a call is made to an unsupported operation.

See Also:

CryptoSystem.isStrong()

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

isStrong

public boolean isStrong()
                 throws CryptoTokenException,
                        CryptoUnsupportedOperationException

Returns whether or not the CryptoSystem is cryptographically strong as of the release date of the code.

Note: Due to the nature of cryptography, things that are presently strong may be insecure in the future.

Specified by:

isStrong in interface CryptoSystem

Returns:

true if the crypto system is strong as of the release date of this code.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

getName

public String getName()
               throws CryptoTokenException,
                      CryptoUnsupportedOperationException

Returns a String that indicates the set of parameters in use, eg "SUN1024", or null.

Specified by:

getName in interface CryptoSystem

Returns:

A String representing the name of the crypto system.

Throws:

CryptoTokenException - Thrown if an error occurs with the crypto token or the crypto token is invalid.

CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

getP

public byte[] getP()
            throws CryptoTokenException,
                   CryptoUnsupportedOperationException

Returns the p domain parameter.

Returns:

A byte array containing p.

Throws:

CryptoTokenException - Thrown if an error occurs with the crypto token or the crypto token is invalid.

CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

getQ

public byte[] getQ()
            throws CryptoTokenException,
                   CryptoUnsupportedOperationException

Returns the q domain parameter, or null.

Returns:

A byte array containing q.

Throws:

CryptoTokenException - Thrown if an error occurs with the crypto token or the crypto token is invalid.

CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

getG

public byte[] getG()
            throws CryptoTokenException,
                   CryptoUnsupportedOperationException

Returns the g domain parameter.

Returns:

A byte array containing g.

Throws:

CryptoTokenException - Thrown if an error occurs with the crypto token or the crypto token is invalid.

CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

getPublicKeyLength

public int getPublicKeyLength()
                       throws CryptoTokenException,
                              CryptoUnsupportedOperationException

Returns the length of the public key.

Returns:

An integer representing the length of the key.

Throws:

CryptoTokenException - Thrown if an error occurs with the crypto token or the crypto token is invalid.

CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

getPrivateKeyLength

public int getPrivateKeyLength()
                        throws CryptoTokenException,
                               CryptoUnsupportedOperationException

Returns the length of the private key.

Returns:

An integer representing the length of the key.

Throws:

CryptoTokenException - Thrown if an error occurs with the crypto token or the crypto token is invalid.

CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

hashCode

public int hashCode()

Description copied from class: Object

Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided by java.util.Hashtable.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the Object.equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hashtables.

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java^TM programming language.)

Overrides:

hashCode in class Object

Following copied from class: java.lang.Object

Returns:

a hash code value for this object.

See Also:

Object.equals(java.lang.Object), Hashtable

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

equals

public boolean equals(Object obj)

Description copied from class: Object

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation:

• It is reflexive: for any reference value x, x.equals(x) should return true.
• It is symmetric: for any reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the object is modified.
• For any non-null reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any reference values x and y, this method returns true if and only if x and y refer to the same object (x==y has the value true).

Overrides:

equals in class Object

Since:

JDE 3.6

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

createKeyPair

public KeyPair createKeyPair()
                      throws CryptoTokenException,
                             CryptoUnsupportedOperationException

Description copied from interface: CryptoSystem

Creates a new key pair using this crypto system.

Specified by:

createKeyPair in interface CryptoSystem

Following copied from interface: net.rim.device.api.crypto.CryptoSystem

Throws:

CryptoTokenException - Thrown if an error occurs with the crypto token or the crypto token is invalid.

CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

createDSAKeyPair

public DSAKeyPair createDSAKeyPair()
                            throws CryptoTokenException,
                                   CryptoUnsupportedOperationException

Category:

Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.