gnu.java.security.key.dss
Class DSSKey
- DSAKey, Key, Serializable
A base asbtract class for both public and private DSS (Digital Signature
Standard) keys. It encapsulates the three DSS numbers:
p,
q and
g.
According to the JDK, cryptographic
Keys all have a
format.
The format used in this implementation is called
Raw, and basically
consists of the raw byte sequences of algorithm parameters. The exact order
of the byte sequences and the implementation details are given in each of the
relevant
getEncoded() methods of each of the private and
public keys.
IMPORTANT: Under certain circumstances (e.g. in an X.509 certificate
with inherited AlgorithmIdentifier's parameters of a SubjectPublicKeyInfo
element) these three MPIs may be
null.
protected int | defaultFormat- Identifier of the default encoding format to use when externalizing the key
material.
|
protected BigInteger | g-
g = h(p-1)/q mod p, where h is
any integer with 1 < h < p - 1 such that h
(p-1)/q mod p > 1 (g
has order q mod p
).
|
protected BigInteger | p- A prime modulus, where
2L-1 < p < 2L for
512 <= L <= 1024 and L a multiple of
64.
|
protected BigInteger | q- A prime divisor of
p - 1, where
2159 < q
< 2160.
|
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
defaultFormat
protected final int defaultFormat
Identifier of the default encoding format to use when externalizing the key
material.
g
protected final BigInteger g
g = h(p-1)/q mod p, where h is
any integer with 1 < h < p - 1 such that h
(p-1)/q mod p > 1 (g
has order q mod p
).
p
protected final BigInteger p
A prime modulus, where
2L-1 < p < 2L for
512 <= L <= 1024 and L a multiple of
64.
q
protected final BigInteger q
A prime divisor of p - 1, where
2159 < q
< 2160.
DSSKey
protected DSSKey(int defaultFormat,
BigInteger p,
BigInteger q,
BigInteger g) Trivial protected constructor.
defaultFormat - the identifier of the encoding format to use by
default when externalizing the key.p - the DSS parameter p.q - the DSS parameter q.g - the DSS parameter g.
equals
public boolean equals(Object obj)
Returns
true if the designated object is an instance of
DSAKey and has the same DSS (Digital Signature Standard) parameter
values as this one.
Always returns
false if the MPIs of this key are
inherited. This may be the case when the key is re-constructed from
an X.509 certificate with absent or NULL AlgorithmIdentifier's parameters
field.
- equals in interface Object
obj - the other non-null DSS key to compare to.
true if the designated object is of the same type
and value as this one.
getEncoded
public abstract byte[] getEncoded(int format)
hasInheritedParameters
public boolean hasInheritedParameters()
true if p, q and
g are all null. Returns
false otherwise.
toString
public String toString()
Convert this Object to a human-readable String.
There are no limits placed on how long this String
should be or what it should contain. We suggest you
make it as intuitive as possible to be able to place
it into
System.out.println()
and such.
It is typical, but not required, to ensure that this method
never completes abruptly with a
RuntimeException.
This method will be called when performing string
concatenation with this object. If the result is
null, string concatenation will instead
use
"null".
The default implementation returns
getClass().getName() + "@" +
Integer.toHexString(hashCode()).
- toString in interface Object
- the String representing this Object, which may be null
DSSKey.java --
Copyright 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
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