Package 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:

  • Constructor Details

    • SAKKEPublicKeyParameters

      public SAKKEPublicKeyParameters(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 Details

    • getIdentifier

      public 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 BigInteger getPrime()
      Returns:
      Prime modulus p defining the field F_p (RFC 6508, Section 2.1)

    • getQ

      public 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 BigInteger getG()
      Returns:
      The pairing result g = invalid input: '<'P,P> (RFC 6508, Section 3.2)