Class SM9Signer

java.lang.Object
org.bouncycastle.crypto.signers.SM9Signer
All Implemented Interfaces:
Signer
public class SM9Signer extends Object implements Signer
The SM9 identity-based digital signature algorithm (GM/T 0044.2-2016).

For signing, initialise with an SM9SigPrivateKeyParameters (optionally wrapped in ParametersWithRandom). For verifying, initialise with an SM9SigMasterPublicKeyParameters wrapped in a ParametersWithID carrying the signer's identity.

The produced signature is encoded as h (32 bytes, big-endian) followed by the uncompressed encoding of the G1 point S (0x04 || x || y).

  • Constructor Summary

    Constructors
    Constructor
    Description
    SM9Signer()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    byte[]
    generateSignature()
    generate a signature for the message we've been loaded with using the key we were initialised with.
    void
    init(boolean forSigning, CipherParameters param)
    Initialise the signer for signing or verification.
    void
    reset()
    reset the internal state
    void
    update(byte b)
    update the internal digest with the byte b
    void
    update(byte[] in, int off, int len)
    update the internal digest with the byte array in
    boolean
    verifySignature(byte[] signature)
    return true if the internal state represents the signature described in the passed in array.

    Methods inherited from class Object

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

  • Constructor Details

    • SM9Signer

      public SM9Signer()

  • Method Details

    • init

      public void init(boolean forSigning, CipherParameters param)
      Description copied from interface: Signer
      Initialise the signer for signing or verification.
      Specified by:
      init in interface Signer
      Parameters:
      forSigning - true if for signing, false otherwise
      param - necessary parameters.

    • update

      public void update(byte b)
      Description copied from interface: Signer
      update the internal digest with the byte b
      Specified by:
      update in interface Signer

    • update

      public void update(byte[] in, int off, int len)
      Description copied from interface: Signer
      update the internal digest with the byte array in
      Specified by:
      update in interface Signer

    • generateSignature

      public byte[] generateSignature() throws CryptoException
      Description copied from interface: Signer
      generate a signature for the message we've been loaded with using the key we were initialised with.
      Specified by:
      generateSignature in interface Signer
      Throws:
      CryptoException

    • verifySignature

      public boolean verifySignature(byte[] signature)
      Description copied from interface: Signer
      return true if the internal state represents the signature described in the passed in array.
      Specified by:
      verifySignature in interface Signer

    • reset

      public void reset()
      Description copied from interface: Signer
      reset the internal state
      Specified by:
      reset in interface Signer