Class SM9EncMasterPublicKeyParameters

java.lang.Object
org.bouncycastle.crypto.params.AsymmetricKeyParameter
org.bouncycastle.crypto.params.SM9EncMasterPublicKeyParameters
All Implemented Interfaces:
CipherParameters
public class SM9EncMasterPublicKeyParameters extends AsymmetricKeyParameter
SM9 encryption master public key P_pub-e = [ke]P1, a point of G1 (GM/T 0044.4-2016). Note the group roles are swapped relative to signature: the encryption master public key lives in G1 and users' keys in G2.

  • Method Details

    • getUserPublicKey

      public SM9EncPublicKeyParameters getUserPublicKey(byte[] identity)
      The encryption public key of the user identified by identity: the recipient key a sender encapsulates to (or encrypts to), formed from this master public key and the identity under the encryption hid 0x03 (GM/T 0044.4). It is derived from the published master public key alone, so any sender can construct it without KGC interaction.

    • getUserPublicKey

      public SM9EncPublicKeyParameters getUserPublicKey(byte[] identity, byte hid)
      The public key of the user identified by identity under an explicit hid (0x03 encryption/KEM, 0x02 key exchange) - use when the KGC's published hid differs from the encryption default.

    • recipientPoint

      public ECPoint recipientPoint(byte[] identity)
      Q = [H1(identity||hid, N)]P1 + P_pub-e, the recipient's public key point in G1, using the encryption hid (0x03).

    • recipientPoint

      public ECPoint recipientPoint(byte[] identity, byte hid)
      Q = [H1(identity||hid, N)]P1 + P_pub-e for an explicit hid (0x03 encryption, 0x02 key exchange).

    • pairingWithP2

      public Fp12 pairingWithP2()
      g = e(P_pub-e, P2), the fixed pairing value used by both encapsulation and encryption.

    • getEncoded

      public byte[] getEncoded()
      The master public key point P_pub-e of G1 in uncompressed form (0x04 || x || y, 65 bytes).

    • fromEncoded

      public static SM9EncMasterPublicKeyParameters fromEncoded(byte[] enc)