iaik.security.ecc.spec
Class ECCParameterSpec

java.lang.Object
  iaik.security.ecc.spec.ECCParameterSpec

All Implemented Interfaces:

java.security.spec.AlgorithmParameterSpec

public class ECCParameterSpec

extends java.lang.Object

implements java.security.spec.AlgorithmParameterSpec

The repository for the elliptic curve parameters.

See Also:

ECCParameterFactory

Field Summary

protected FieldElement	a_ The elliptic curve parameter a.
protected FieldElement	b_ The coefficient b (satisfying b^2 * c congruent -27 mod p).
protected java.math.BigInteger	c_ The output c of the SHA-1 based algorithm.
protected FieldElement	gx_ The base point x coordinate Gx
protected FieldElement	gy_ The base point y coordinate Gy
protected java.math.BigInteger	k_ The co-factor
protected java.lang.String	oid_ The unique object identifier of this parameter set.
protected FieldElement	p_ The prime modulus p or the irreducible polynomial, defining the field.
protected java.math.BigInteger	r_ The order r.
protected java.math.BigInteger	s_ The 160-bit input seed s to the SHA-1 based algorithm.
protected int	t_ The type of normal basis (not used)

Constructor Summary

ECCParameterSpec(java.math.BigInteger p, java.math.BigInteger k, java.math.BigInteger r, java.math.BigInteger s, java.math.BigInteger c, java.math.BigInteger a, java.math.BigInteger b, java.math.BigInteger gx, java.math.BigInteger gy, java.lang.String oid)
Generates new parameters for curves over prime fields.

ECCParameterSpec(int[] irreducible, java.math.BigInteger k, java.math.BigInteger r, int[] a, int[] b, int[] gx, int[] gy, java.lang.String oid)
Generates new parameters for curves over binary fields.

Method Summary

FieldElement	getA()
FieldElement	getB()
java.math.BigInteger	getC()
FieldElement	getGx()
FieldElement	getGy()
java.math.BigInteger	getK()
java.lang.String	getOID()
FieldElement	getP()
java.math.BigInteger	getR()
java.math.BigInteger	getS()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

a_

protected FieldElement a_

The elliptic curve parameter a.

b_

protected FieldElement b_

The coefficient b (satisfying b^2 * c congruent -27 mod p). The parameter a is always -3.

c_

protected java.math.BigInteger c_

The output c of the SHA-1 based algorithm. Not needed so far.

gx_

protected FieldElement gx_

The base point x coordinate Gx

gy_

protected FieldElement gy_

The base point y coordinate Gy

k_

protected java.math.BigInteger k_

The co-factor

oid_

protected java.lang.String oid_

The unique object identifier of this parameter set.

p_

protected FieldElement p_

The prime modulus p or the irreducible polynomial, defining the field.

r_

protected java.math.BigInteger r_

The order r.

s_

protected java.math.BigInteger s_

The 160-bit input seed s to the SHA-1 based algorithm. Not needed so far.

t_

protected int t_

The type of normal basis (not used)

Constructor Detail

ECCParameterSpec

public ECCParameterSpec(java.math.BigInteger p,
                        java.math.BigInteger k,
                        java.math.BigInteger r,
                        java.math.BigInteger s,
                        java.math.BigInteger c,
                        java.math.BigInteger a,
                        java.math.BigInteger b,
                        java.math.BigInteger gx,
                        java.math.BigInteger gy,
                        java.lang.String oid)

Generates new parameters for curves over prime fields. Applications should use the ECCarameterFactory to get an instance of this class.

Parameters:

p - the prime modulus p, defining the field.

k - the cofactor.

r - the order r.

s - the 160-bit input seed s to the SHA-1 based algorithm.

c - the output c of the SHA-1 based algorithm.

a - the coefficient a

b - the coefficient b (satisfying b^2 * c congruent -27 mod p);

gx - the base point x coordinate Gx

gy - the base point y coordinate Gy

oid - the objet identifier of this ecc parameter (or null).

ECCParameterSpec

public ECCParameterSpec(int[] irreducible,
                        java.math.BigInteger k,
                        java.math.BigInteger r,
                        int[] a,
                        int[] b,
                        int[] gx,
                        int[] gy,
                        java.lang.String oid)

Generates new parameters for curves over binary fields. Applications should use the NISTParameterFactory to get an instance of this class.

Parameters:

irreducible - the irreducible, defining the field.

k - the cofactor.

r - the order r.

a - the coefficient a

b - the coefficient b (satisfying b^2 * c congruent -27 mod p);

gx - the base point x coordinate Gx

gy - the base point y coordinate Gy

oid - the objet identifier of this ecc parameter (or null).

Method Detail

getA

public FieldElement getA()

Returns:

the curve coefficient a

getB

public FieldElement getB()

Returns:

the curve coefficient b (satisfying b^2 * c congruent -27 mod p);

getC

public java.math.BigInteger getC()

Returns:

the output c of the SHA-1 based algorithm or null if unkonown

getGx

public FieldElement getGx()

Returns:

the base point x coordinate Gx.

getGy

public FieldElement getGy()

Returns:

the base point y coordinate Gy.

getK

public java.math.BigInteger getK()

Returns:

the co-factor k.

getOID

public java.lang.String getOID()

Returns:

the unique object identifier (or null if not specified).

getP

public FieldElement getP()

Returns:

the prime modulus p, defining the field.

getR

public java.math.BigInteger getR()

Returns:

the order r.

getS

public java.math.BigInteger getS()

Returns:

the 160-bit input seed s to the SHA-1 based algorithm or null if unknown

toString

public java.lang.String toString()

Returns:

this parameter set as a string.