Class 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 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 = (RFC 6508, Section 3.2)