com.ibm.crypto.fips.provider

Class DSAPublicKey

java.lang.Object

com.ibm.security.x509.X509Key

com.ibm.crypto.fips.provider.DSAPublicKey

All Implemented Interfaces:

java.io.Serializable, java.security.interfaces.DSAKey, java.security.interfaces.DSAPublicKey, java.security.Key, java.security.PublicKey

public final class DSAPublicKey
extends com.ibm.security.x509.X509Key
implements java.security.interfaces.DSAPublicKey, java.io.Serializable

This class represents an X.509 public key for the DSA Algorithm.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.ibm.security.x509.X509Key

algid, encodedKey, key

Constructor Summary

Constructors

Constructor and Description
DSAPublicKey(java.math.BigInteger y, java.math.BigInteger p, java.math.BigInteger q, java.math.BigInteger g) Create a new DSA public key from y, p, q, and g.
DSAPublicKey(byte[] encoded) Make a DSA public key from its DER encoding (X.509).

Method Summary

Methods

Modifier and Type	Method and Description
protected void	finalize() This function zeroizes the key so that it isn't in memory when GC is done.
java.security.interfaces.DSAParams	getParams() Return the DSA parameters for the receiver.
java.math.BigInteger	getY() Return the value of the public key.
protected void	parseKeyBits()
java.lang.String	toString()
void	zeroize() This function zeroizes the key so that it isn't in memory

Methods inherited from class com.ibm.security.x509.X509Key

decode, decode, encode, encode, equals, getAlgorithm, getAlgorithmId, getEncoded, getFormat, getKey, hashCode, parse, parse, read, readBASE64, setKey, write, writeBASE64

Methods inherited from class java.lang.Object

clone, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.security.Key

getAlgorithm, getEncoded, getFormat

Constructor Detail

DSAPublicKey

public DSAPublicKey(java.math.BigInteger y,
            java.math.BigInteger p,
            java.math.BigInteger q,
            java.math.BigInteger g)
             throws java.security.InvalidKeyException

Create a new DSA public key from y, p, q, and g.

Parameters:

y - public key

p - prime modulus

q - prime divisor

g - the number g

Throws:

java.security.InvalidKeyException

DSAPublicKey

public DSAPublicKey(byte[] encoded)
             throws java.security.InvalidKeyException

Make a DSA public key from its DER encoding (X.509).

Parameters:

encoded - the encoded bytes of the public key

Throws:

java.security.InvalidKeyException

Method Detail

getY

public java.math.BigInteger getY()

Return the value of the public key.

Specified by:

getY in interface java.security.interfaces.DSAPublicKey

Parameters:

the - value of y

getParams

public java.security.interfaces.DSAParams getParams()

Return the DSA parameters for the receiver.

Specified by:

getParams in interface java.security.interfaces.DSAKey

Returns:

DSAParams the DSA parameters of this instance

parseKeyBits

protected void parseKeyBits()
                     throws java.security.InvalidKeyException

Overrides:

parseKeyBits in class com.ibm.security.x509.X509Key

Throws:

java.security.InvalidKeyException

toString

public java.lang.String toString()

Overrides:

toString in class com.ibm.security.x509.X509Key

zeroize

public void zeroize()

This function zeroizes the key so that it isn't in memory

finalize

protected void finalize()

This function zeroizes the key so that it isn't in memory when GC is done.

Overrides:

finalize in class java.lang.Object