cryptix.provider.rsa

Class BaseRSAPrivateKey

java.lang.Object

cryptix.provider.rsa.BaseRSAPrivateKey

All Implemented Interfaces:

java.io.Serializable, java.security.Key, java.security.PrivateKey, CryptixRSAPrivateKey, RSAFactors, RSAKey

Direct Known Subclasses:

RawRSAPrivateKey

public abstract class BaseRSAPrivateKey
extends java.lang.Object
implements CryptixRSAPrivateKey, RSAFactors

An abstract class representing an RSA private key.

Copyright © 1997 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

$Revision: 1.7 $

Since:

Cryptix 2.2.2

Author:

Raif S. Naffah, David Hopwood

See Also:

Serialized Form

Field Summary

Fields inherited from interface java.security.PrivateKey

serialVersionUID

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BaseRSAPrivateKey() Constructs an RSA private key, without setting the parameters.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.String	getAlgorithm() Returns the name of the algorithm, for this class always "RSA".
java.math.BigInteger	getExponent() Return the private exponent d.
java.math.BigInteger	getInverseOfQModP() Returns the multiplicative inverse of q modulo p.
java.math.BigInteger	getModulus() Return the public modulus n: the product of both p and q.
java.math.BigInteger	getP() Returns p, the first factor of the public modulus.
java.math.BigInteger	getQ() Return q, the second factor of the public modulus.
protected void	setRsaParams(java.math.BigInteger n, java.math.BigInteger d) Sets the RSA parameters n and d.
protected void	setRsaParams(java.math.BigInteger d, java.math.BigInteger p, java.math.BigInteger q, java.math.BigInteger u) Sets the RSA parameters d, p, q, and u, to allow fast execution of mathematical operations performed later on during the life of this key.
java.lang.String	toString() Returns a string representation of this key.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.security.Key

getEncoded, getFormat

Constructor Detail

BaseRSAPrivateKey

protected BaseRSAPrivateKey()

Constructs an RSA private key, without setting the parameters. Subclasses should call one of the setRsaParams methods in each of their constructors.

Method Detail

getModulus

public java.math.BigInteger getModulus()

Return the public modulus n: the product of both p and q.

Specified by:

getModulus in interface RSAKey

Returns:

the public modulus n: the product of both p and q.

getExponent

public java.math.BigInteger getExponent()

Return the private exponent d.

Specified by:

getExponent in interface RSAKey

Returns:

the private exponent d.

getP

public java.math.BigInteger getP()

Returns p, the first factor of the public modulus.

Specified by:

getP in interface RSAFactors

Returns:

the first factor p

getQ

public java.math.BigInteger getQ()

Return q, the second factor of the public modulus.

Specified by:

getQ in interface RSAFactors

Returns:

the second factor q

getInverseOfQModP

public java.math.BigInteger getInverseOfQModP()

Returns the multiplicative inverse of q modulo p. The values p and q are those returned by the getP() and getQ() methods respectively.

Specified by:

getInverseOfQModP in interface RSAFactors

Returns:

the multiplicative inverse of q modulo p.

getAlgorithm

public java.lang.String getAlgorithm()

Returns the name of the algorithm, for this class always "RSA".

Specified by:

getAlgorithm in interface java.security.Key

Returns:

the name of the algorithm, "RSA".

setRsaParams

protected void setRsaParams(java.math.BigInteger n,
                java.math.BigInteger d)

Sets the RSA parameters n and d.

Throws:

java.lang.NullPointerException - if n == null || d == null

setRsaParams

protected void setRsaParams(java.math.BigInteger d,
                java.math.BigInteger p,
                java.math.BigInteger q,
                java.math.BigInteger u)

Sets the RSA parameters d, p, q, and u, to allow fast execution of mathematical operations performed later on during the life of this key. u may be null, in which case it is calculated automatically.

Throws:

java.lang.NullPointerException - if d == null || p == null || q == null

java.security.InvalidParameterException - if u must be calculated, and gcd(q, p) != 1

toString

public java.lang.String toString()

Returns a string representation of this key. This may reveal private information when debugging is enabled, and should be used with care.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this key.