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package sun.security.provider;
import java.util.*;
import java.io.*;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.ProviderException;
import java.security.AlgorithmParameters;
import java.security.spec.DSAParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import java.security.interfaces.DSAParams;
import sun.security.x509.X509Key;
import sun.security.x509.AlgIdDSA;
import sun.security.util.BitArray;
import sun.security.util.Debug;
import sun.security.util.DerValue;
import sun.security.util.DerInputStream;
import sun.security.util.DerOutputStream;
An X.509 public key for the Digital Signature Algorithm.
Author: Benjamin Renaud See Also:
/**
* An X.509 public key for the Digital Signature Algorithm.
*
* @author Benjamin Renaud
*
*
* @see DSAPrivateKey
* @see AlgIdDSA
* @see DSA
*/
public class DSAPublicKey extends X509Key
implements java.security.interfaces.DSAPublicKey, Serializable {
use serialVersionUID from JDK 1.1. for interoperability /** use serialVersionUID from JDK 1.1. for interoperability */
private static final long serialVersionUID = -2994193307391104133L;
/* the public key */
private BigInteger y;
/*
* Keep this constructor for backwards compatibility with JDK1.1.
*/
public DSAPublicKey() {
}
Make a DSA public key out of a public key and three parameters.
The p, q, and g parameters may be null, but if so, parameters will need
to be supplied from some other source before this key can be used in
cryptographic operations. PKIX RFC2459bis explicitly allows DSA public
keys without parameters, where the parameters are provided in the
issuer's DSA public key.
Params: - y – the actual key bits
- p – DSA parameter p, may be null if all of p, q, and g are null.
- q – DSA parameter q, may be null if all of p, q, and g are null.
- g – DSA parameter g, may be null if all of p, q, and g are null.
/**
* Make a DSA public key out of a public key and three parameters.
* The p, q, and g parameters may be null, but if so, parameters will need
* to be supplied from some other source before this key can be used in
* cryptographic operations. PKIX RFC2459bis explicitly allows DSA public
* keys without parameters, where the parameters are provided in the
* issuer's DSA public key.
*
* @param y the actual key bits
* @param p DSA parameter p, may be null if all of p, q, and g are null.
* @param q DSA parameter q, may be null if all of p, q, and g are null.
* @param g DSA parameter g, may be null if all of p, q, and g are null.
*/
public DSAPublicKey(BigInteger y, BigInteger p, BigInteger q,
BigInteger g)
throws InvalidKeyException {
this.y = y;
algid = new AlgIdDSA(p, q, g);
try {
byte[] keyArray = new DerValue(DerValue.tag_Integer,
y.toByteArray()).toByteArray();
setKey(new BitArray(keyArray.length*8, keyArray));
encode();
} catch (IOException e) {
throw new InvalidKeyException("could not DER encode y: " +
e.getMessage());
}
}
Make a DSA public key from its DER encoding (X.509).
/**
* Make a DSA public key from its DER encoding (X.509).
*/
public DSAPublicKey(byte[] encoded) throws InvalidKeyException {
decode(encoded);
}
Returns the DSA parameters associated with this key, or null if the
parameters could not be parsed.
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
Get the raw public value, y, without the parameters.
See Also: - getParameters
/**
* Get the raw public value, y, without the parameters.
*
* @see getParameters
*/
public BigInteger getY() {
return y;
}
public String toString() {
return "Sun DSA Public Key\n Parameters:" + algid
+ "\n y:\n" + Debug.toHexString(y) + "\n";
}
protected void parseKeyBits() throws InvalidKeyException {
try {
DerInputStream in = new DerInputStream(getKey().toByteArray());
y = in.getBigInteger();
} catch (IOException e) {
throw new InvalidKeyException("Invalid key: y value\n" +
e.getMessage());
}
}
}