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de.flexiprovider.pqc.ecc.niederreiter
Class NiederreiterPrivateKey

java.lang.Object
  |
  +--de.flexiprovider.api.keys.PrivateKey
        |
        +--de.flexiprovider.pqc.ecc.niederreiter.NiederreiterPrivateKey
All Implemented Interfaces:
java.security.Key, Key, java.security.PrivateKey, java.io.Serializable
public class NiederreiterPrivateKey
extends PrivateKey

This class implements a Niederreiter private key and is usually instantiated from the NiederreiterKeyPairGenerator.

Author:
Elena Klintsevich
See Also:
NiederreiterKeyPairGenerator, NiederreiterPrivateKey, Serialized Form

Fields inherited from interface java.security.Key
serialVersionUID
 
Fields inherited from interface java.security.PrivateKey
serialVersionUID
 
Constructor Summary
protected NiederreiterPrivateKey(int m, int k, GF2mField field, PolynomialGF2mSmallM gp, PolynomialGF2mSmallM[] qInv, GF2Matrix sInv, Permutation p)
          Constructor, used by NiederreiterKeyPairGenerator.
protected NiederreiterPrivateKey(NiederreiterPrivateKeySpec keySpec)
          Constructor, used by NiederreiterKeyFactory.
 
Method Summary
 boolean equals(java.lang.Object other)
          Compare this key with another object.
 java.lang.String getAlgorithm()
          Return the name of the algorithm.
protected  codec.asn1.ASN1Type getAlgParams()
           
 GF2mField getField()
           
 PolynomialGF2mSmallM getGoppaPoly()
           
 int getK()
           
protected  byte[] getKeyData()
          Return the key data to encode in the SubjectPublicKeyInfo structure.
 int getM()
           
 int getN()
           
protected  codec.asn1.ASN1ObjectIdentifier getOID()
           
 Permutation getP()
           
 PolynomialGF2mSmallM[] getQInv()
           
 GF2Matrix getSInv()
           
 int getT()
           
 int hashCode()
           
 java.lang.String toString()
           
 
Methods inherited from class de.flexiprovider.api.keys.PrivateKey
getEncoded, getFormat
 
Methods inherited from class java.lang.Object
, clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

NiederreiterPrivateKey

protected NiederreiterPrivateKey(int m,
                                 int k,
                                 GF2mField field,
                                 PolynomialGF2mSmallM gp,
                                 PolynomialGF2mSmallM[] qInv,
                                 GF2Matrix sInv,
                                 Permutation p)
Constructor, used by NiederreiterKeyPairGenerator.
Parameters:
m - extension degree of the field
k - dimension of the code
field - finite field
gp - irreducible Goppa polynomial
qInv - matrix used to compute square roots in (GF(2m))t
sInv - random non-singular matrix S-1
p - permutation P

NiederreiterPrivateKey

protected NiederreiterPrivateKey(NiederreiterPrivateKeySpec keySpec)
Constructor, used by NiederreiterKeyFactory.
Parameters:
keySpec - a NiederreiterPrivateKeySpec
Method Detail

getAlgorithm

public java.lang.String getAlgorithm()
Return the name of the algorithm.
Returns:
"Niederreiter"

getM

public int getM()
Returns:
the extension degree of the field

getK

public int getK()
Returns:
the dimension of the code

getT

public int getT()
Returns:
the error correction capability of the code

getN

public int getN()
Returns:
the length of the code

getField

public GF2mField getField()
Returns:
the underlying field

getGoppaPoly

public PolynomialGF2mSmallM getGoppaPoly()
Returns:
the irreducible Goppa polynomial

getSInv

public GF2Matrix getSInv()
Returns:
the random non-singular matrix S-1

getP

public Permutation getP()
Returns:
the permutation P

getQInv

public PolynomialGF2mSmallM[] getQInv()
Returns:
the matrix used to compute square roots in (GF(2m))t

toString

public java.lang.String toString()
Overrides:
toString in class java.lang.Object
Returns:
a human readable form of the key.

equals

public boolean equals(java.lang.Object other)
Compare this key with another object.
Overrides:
equals in class java.lang.Object
Parameters:
other - the other object
Returns:
the result of the comparison

hashCode

public int hashCode()
Overrides:
hashCode in class java.lang.Object
Returns:
the hash code of this key

getOID

protected codec.asn1.ASN1ObjectIdentifier getOID()
Overrides:
getOID in class PrivateKey
Returns:
the OID to encode in the SubjectPublicKeyInfo structure

getAlgParams

protected codec.asn1.ASN1Type getAlgParams()
Overrides:
getAlgParams in class PrivateKey
Returns:
the algorithm parameters to encode in the SubjectPublicKeyInfo structure

getKeyData

protected byte[] getKeyData()
Return the key data to encode in the SubjectPublicKeyInfo structure.

The ASN.1 definition of the key structure is 

       NiederreiterPrivateKey ::= SEQUENCE {
         m             Integer       -- extension degree of the field
         k             Integer       -- dimension of the code
         field         OCTET STRING  -- encoded field polynomial
         irrGoppaPoly  OCTET STRING  -- encoded Goppa polynomial
         sInv          OCTET STRING  -- encoded random non-singular matrix
         p             OCTET STRING  -- encoded permutation
         qInv          OCTET STRING  -- encoded matrix used to compute square roots  
       }
Overrides:
getKeyData in class PrivateKey
Returns:
the keyData to encode in the SubjectPublicKeyInfo structure
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