org.bouncycastle.crypto.params

Class SAKKEPublicKeyParameters

java.lang.Object

org.bouncycastle.crypto.params.AsymmetricKeyParameter

org.bouncycastle.crypto.params.SAKKEPublicKeyParameters

All Implemented Interfaces:

CipherParameters

public class SAKKEPublicKeyParameters
extends AsymmetricKeyParameter

Represents the public parameters for the SAKKE (Sakai-Kasahara Key Encryption) scheme as defined in RFC 6508. This class encapsulates the cryptographic domain parameters and public key components required for SAKKE operations.

Contains the following public parameters (RFC 6508, Section 2.3):

• Prime modulus p defining the field F_p
• Subgroup order q (divides p+1)
• Base point P on the elliptic curve E(F_p)
• Pairing result g = <P,P>
• KMS Public Key Z_S = [z_S]P
• Security parameter n (SSV bit length)
• User Identifier
• Elliptic curve parameters (a = -3, b = 0)

The predefined parameters in this implementation correspond to the 128-bit security level example from RFC 6509 Appendix A.

See Also:

RFC 6508: Sakai-Kasahara Key Encryption, RFC 6509: MIKEY-SAKKE

Constructor Summary

Constructors

Constructor and Description
SAKKEPublicKeyParameters(java.math.BigInteger identifier, ECPoint Z) Constructs SAKKE public key parameters with the specified identifier and KMS Public Key.

Method Summary

Modifier and Type	Method and Description
ECCurve	getCurve()
Digest	getDigest()
java.math.BigInteger	getG()
java.math.BigInteger	getIdentifier()
int	getN()
ECPoint	getPoint()
java.math.BigInteger	getPrime()
java.math.BigInteger	getQ()
ECPoint	getZ()

Methods inherited from class org.bouncycastle.crypto.params.AsymmetricKeyParameter

isPrivate

Methods inherited from class java.lang.Object

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

Constructor Detail

SAKKEPublicKeyParameters

public SAKKEPublicKeyParameters(java.math.BigInteger identifier,
                                ECPoint Z)

Constructs SAKKE public key parameters with the specified identifier and KMS Public Key.

Parameters:

identifier - The user's identifier as defined in RFC 6508, Section 2.2. Must be a valid integer in [2, q-1].

Z - The KMS Public Key Z_S = [z_S]P (RFC 6508, Section 2.2). Must be a valid point on the curve E(F_p).

Method Detail

getIdentifier

public java.math.BigInteger getIdentifier()

Returns:

The user's identifier (RFC 6508, Section 2.2)

getZ

public ECPoint getZ()

Returns:

The KMS Public Key Z_S = [z_S]P (RFC 6508, Section 2.2)

getCurve

public ECCurve getCurve()

Returns:

The elliptic curve E(F_p) with parameters from RFC 6509 Appendix A

getPoint

public ECPoint getPoint()

Returns:

The base point P on E(F_p) (RFC 6508, Section 3.1)

getPrime

public java.math.BigInteger getPrime()

Returns:

Prime modulus p defining the field F_p (RFC 6508, Section 2.1)

getQ

public java.math.BigInteger getQ()

Returns:

Subgroup order q (divides p+1) (RFC 6508, Section 2.1)

getN

public int getN()

Returns:

Security parameter n (SSV bit length = 128 bits)

getDigest

public Digest getDigest()

Returns:

The hash function (SHA-256) used in SAKKE operations

getG

public java.math.BigInteger getG()

Returns:

The pairing result g = <P,P> (RFC 6508, Section 3.2)