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Oracle Security Developer Tools Crypto Java API Reference 11g (11.1.1) E10668-02 |
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java.lang.Object
oracle.security.crypto.core.DSAPublicKey
public class DSAPublicKey
A DSA public key.
The OID used to identify the key algorithm may be set via setKeyAlgOID
. The encoding used for keys of this class is based on the SubjectPublicKeyInfo structure of X.509, and is compatible with that used in JDK 1.2.
DSA
, Serialized FormConstructor Summary | |
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DSAPublicKey() Makes a new, uninitialized instance. |
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DSAPublicKey(ASN1Sequence s) Deprecated. Use DSAPublicKey(InputStream is) instead. |
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DSAPublicKey(java.math.BigInteger y, DSAParams params) Makes a new instance with the given set of parameters and value of y. |
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DSAPublicKey(byte[] data) Makes a new instance by reading its encoding from the given byte array. |
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DSAPublicKey(java.io.InputStream is) Makes a new instance by reading its encoding from the given input stream. |
Method Summary | |
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java.lang.Object |
clone() Creates a deep copy of this DSAPublicKey instance. |
void |
erase() Erases the sensitive key material of a private or symmetric key, making the key un-usable. |
void |
finalize() Erases this object prior to being reclaimed by the garbage collector. |
AlgorithmIdentifier |
getAlgID() Returns the algorithm identifier for this key. |
java.lang.String |
getAlgorithm() Gets the algorithm name for this key. |
boolean |
getAllowExport() Always returns true . |
int |
getBitLength() Returns the number of bits needed to represent the DSAPublicKey's public component P. |
ASN1Object |
getContents() Returns the contents of this key. |
byte[] |
getEncoded() Returns the encoded form of this key. |
java.lang.String |
getFormat() Returns a string which indicates the format of this object's encoding. |
ASN1ObjectID |
getKeyAlgOID() Returns the key algorithm OID. |
DSAParams |
getParams() Returns the DSA algorithm parameters for this public key. |
java.math.BigInteger |
getY() Gets y. |
void |
initialize(AlgorithmIdentifier algID, ASN1Object contents) Initializes this instance from the given algorithm paramters and key contents. |
void |
input(ASN1Sequence s) Deprecated. use input(InputStream is) instead. |
void |
input(java.io.InputStream is) Inputs a DSAPublicKey object by reading its encoding from the given input stream. |
int |
length() Gets the length of the encoding of this object. |
void |
output(java.io.OutputStream os) Outputs encoding of this object to a given output stream. |
void |
readExternal(java.io.ObjectInput is) Reads the input stream and initializes the DSA public key. |
void |
setKeyAlgOID(ASN1ObjectID oid) Sets the key algorithm OID. |
void |
setParams(DSAParams params) Sets the DSA algorithm parameters for this public key. |
java.lang.String |
toString() Returns a string which describes this object. |
void |
writeExternal(java.io.ObjectOutput os) Writes to the output stream the DER encoding of this object. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public DSAPublicKey()
public DSAPublicKey(java.math.BigInteger y, DSAParams params)
y
- The value of y.params
- The DSAParams
of this DSAPublicKey
.public DSAPublicKey(byte[] data) throws java.io.IOException
data
- The byte array from which this object will be read.java.io.IOException
- If an input exception occured.public DSAPublicKey(java.io.InputStream is) throws java.io.IOException
is
- The input stream from from which this object will be read.java.io.IOException
- If an input exception occured.public DSAPublicKey(ASN1Sequence s) throws java.io.IOException
DSAPublicKey(InputStream is)
instead.
java.io.IOException
Method Detail |
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public byte[] getEncoded()
Key
getEncoded
in interface Key
public java.lang.String getAlgorithm()
getAlgorithm
in interface Key
public int getBitLength()
0 will be returned if the key has not been initialized.
getBitLength
in interface Key
public java.lang.String getFormat()
getFormat
in interface Key
public void erase()
Key
Note: After erase()
has been invoked, no other methods of the Key
object are guaranteed to function correctly. In particular, invoking another method after erase()
may result in a NullPointerException
being thrown.
erase
in interface Key
public void finalize()
Note: There is no guarantee of when, if ever, finalize
will be invoked by the Java runtime.
finalize
in class java.lang.Object
public java.lang.Object clone()
DSAPublicKey
instance.clone
in interface Key
clone
in class java.lang.Object
public boolean getAllowExport()
true
.getAllowExport
in interface Key
FIPS_140_2.getAllowKeyExport()
public void initialize(AlgorithmIdentifier algID, ASN1Object contents) throws AlgorithmIdentifierException, InvalidInputException
PublicKey
initialize
in interface PublicKey
AlgorithmIdentifierException
InvalidInputException
public AlgorithmIdentifier getAlgID()
PublicKey
getAlgID
in interface PublicKey
public ASN1Object getContents()
PublicKey
getContents
in interface PublicKey
public ASN1ObjectID getKeyAlgOID()
DSA.dsaKeyOID
, is returned.DSA.dsaKeyOID
public void setKeyAlgOID(ASN1ObjectID oid)
oid
- the key algorithm OIDpublic java.math.BigInteger getY()
public void setParams(DSAParams params)
public DSAParams getParams()
public java.lang.String toString()
toString
in class java.lang.Object
public void input(java.io.InputStream is) throws java.io.IOException
DSAPublicKey
object by reading its encoding from the given input stream.input
in interface Streamable
is
- The input stream from which this object will be read.java.io.IOException
- If an input exception occured.public void input(ASN1Sequence s) throws java.io.IOException
input(InputStream is)
instead.java.io.IOException
public void output(java.io.OutputStream os) throws java.io.IOException
output
in interface Streamable
os
- The output stream to which the encoding of this object will be written.java.io.IOException
- If an output exception occured.public int length()
length
in interface Streamable
public void writeExternal(java.io.ObjectOutput os) throws java.io.IOException
writeExternal
in interface java.io.Externalizable
os
- The output stream to write the encoding to.java.io.IOException
public void readExternal(java.io.ObjectInput is) throws java.io.IOException, java.lang.ClassNotFoundException
readExternal
in interface java.io.Externalizable
is
- The stream to read from.java.io.IOException
java.lang.ClassNotFoundException
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Oracle Security Developer Tools Crypto Java API Reference 11g (11.1.1) E10668-02 |
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