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Oracle Fusion Middleware Crypto FIPS Java API Reference for Oracle Security Developer Tools 11g Release 1 (11.1.1) E10696-03 |
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java.lang.Object
oracle.security.crypto.core.DSAParams
public class DSAParams
Parameters used for the Digital Signature Standard, as described in FIPS 186. The parameter names used here match that reference.
The necessary parameters to implement DSA are:
The following ASN.1 encoding is used, defined in the PKIX draft standard:
Dss-Parms ::= SEQUENCE { p INTEGER, q INTEGER, g INTEGER }
A DSAParams may also store the seed and counter used to generate p and q.
Warning: The serialization capability of this class should only be used for short-term storage and RMI between applications running the same version of this product. It should not be relied on for long-term perisistence, as future versions of this class may use an incompatible serialization format. For now, applications requiring long-term persistence should use the ASN.1 encodings provided by the input(InputStream)
and output(OutputStream)
methods directly, instead of serialization.
Constructor Summary | |
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DSAParams() Creates a new empty instance. |
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DSAParams(ASN1Sequence s) Creates a new DSAParams object by parsing the given ASN.1 sequence. |
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DSAParams(java.math.BigInteger p, java.math.BigInteger q, java.math.BigInteger g) Creates a new DSAParams object with the given values of p, q, and g. |
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DSAParams(java.math.BigInteger p, java.math.BigInteger q, java.math.BigInteger g, byte[] seed, int counter, java.math.BigInteger h) Creates a new DSAParams object with the given values of p, q, g, seed, counter and h. |
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DSAParams(java.io.InputStream is) Creates a new DSAParams object by reading its encoding from the given input stream. |
Method Summary | |
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int |
getCounter() Get the counter that was used generate these parameters. |
java.math.BigInteger |
getG() Gets g. |
java.math.BigInteger |
getH() Gets h. |
java.math.BigInteger |
getP() Gets p. |
java.math.BigInteger |
getQ() Gets q. |
byte[] |
getSeed() Gets the seed that was used generate these parameters. |
void |
input(ASN1Sequence s) Parses a DSAParams object from given ASN1Sequence. |
void |
input(java.io.InputStream is) Reads the encoding of a DSAParams object from given InputStream. |
boolean |
isValidParams() Checks if this DSAParams contains DSA domain parameters generated by the FIPs-approved method as specified in FIPS 186-2. |
int |
length() Returns the length of this object's encoding. |
void |
output(java.io.OutputStream os) Outputs the encoding of this DSAParams object to the given OutputStream. |
ASN1Sequence |
outputASN1() Outputs this DSAParams object to the given ASN1Sequence. |
void |
readExternal(java.io.ObjectInput is) Reads the input stream and initializes the DSA parameters. |
java.lang.String |
toString() Transforms this DSAParams object into a readable string. |
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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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public DSAParams()
public DSAParams(java.math.BigInteger p, java.math.BigInteger q, java.math.BigInteger g)
p
- the large prime pq
- the small prime qg
- the generator gpublic DSAParams(java.math.BigInteger p, java.math.BigInteger q, java.math.BigInteger g, byte[] seed, int counter, java.math.BigInteger h)
p
- the large prime pq
- the small prime qg
- the generator gseed
- the seed used to generate p and q.counter
- the counter used to generate p and q.h
- the value used to generate g.public DSAParams(java.io.InputStream is) throws java.io.IOException
is
- the inputStream where the DSAParam comes fromjava.io.IOException
- If an input exception occured.public DSAParams(ASN1Sequence s) throws java.io.IOException
s
- the ASN1Sequence representing the DSAParams.java.io.IOException
- If an input exception occured.Method Detail |
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public java.math.BigInteger getP()
getP
in interface java.security.interfaces.DSAParams
null
if p is not initializedpublic java.math.BigInteger getQ()
getQ
in interface java.security.interfaces.DSAParams
null
if q is not initializedpublic java.math.BigInteger getG()
getG
in interface java.security.interfaces.DSAParams
null
if g is not initializedpublic byte[] getSeed()
null
if seed is not initializedpublic int getCounter()
null
if the count is not initializedpublic java.math.BigInteger getH()
null
if h is not initializedpublic boolean isValidParams()
DSAParams
contains DSA domain parameters generated by the FIPs-approved method as specified in FIPS 186-2.public void input(java.io.InputStream is) throws java.io.IOException
input
in interface Streamable
is
- the inputStream where the DSAParam comes fromjava.io.IOException
- If an input exception occured.output(java.io.OutputStream)
public void input(ASN1Sequence s) throws java.io.IOException
s
- the ASN1Sequence representing the DSAParams.java.io.IOException
- If an input exception occured.outputASN1()
public void output(java.io.OutputStream os) throws java.io.IOException
DSAParams
object to the given OutputStream.output
in interface Streamable
os
- the OutputStream where this DSAParams
will gojava.io.IOException
- If an output exception occured.input(InputStream)
public ASN1Sequence outputASN1()
DSAParams
object to the given ASN1Sequence.DSAParams
will goinput(ASN1Sequence)
public int length()
length
in interface Streamable
public java.lang.String toString()
DSAParams
object into a readable string.toString
in class java.lang.Object
DSAParams
objectpublic 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 Fusion Middleware Crypto FIPS Java API Reference for Oracle Security Developer Tools 11g Release 1 (11.1.1) E10696-03 |
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