Package org.bouncycastle.crypto.signers

Class SM2Signer

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      protected java.math.BigInteger calculateE​(java.math.BigInteger n, byte[] message)  
      protected ECMultiplier createBasePointMultiplier()  
      byte[] generateSignature()
      generate a signature for the message we've been loaded with using the key we were initialised with.
      protected byte[] getZ​(byte[] userID)
      Compute the SM2 Z value - H(ENTL || ID || a || b || xG || yG || xA || yA) as given in 5.1.4.4 of the draft RFC "SM2 Public Key Algorithms".
      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 java.lang.Object

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

    • Constructor Detail

      • SM2Signer

        public SM2Signer()

      • SM2Signer

        public SM2Signer​(Digest digest)

      • SM2Signer

        public SM2Signer​(DSAEncoding encoding)

    • Method Detail

      • 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

      • 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

      • 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

      • getZ

        protected byte[] getZ​(byte[] userID)
        Compute the SM2 Z value - H(ENTL || ID || a || b || xG || yG || xA || yA) as given in 5.1.4.4 of the draft RFC "SM2 Public Key Algorithms". This is called once from init with the digest freshly reset, and the value returned is prepended to the message before e is calculated.

        An override must leave the digest empty on return - this implementation feeds the digest and then consumes it with a doFinal(). Returning a zero-length array leaves the message unprefixed, so a signer constructed with a NullDigest will then sign and verify a caller-supplied pre-hashed e as passed in, for the case where Z and the message hash are calculated elsewhere.

        Parameters:
        userID - the SM2 user ID passed in at init, or the default one if none was given.
        Returns:
        the Z value the message is to be prefixed with.

      • createBasePointMultiplier

        protected ECMultiplier createBasePointMultiplier()

      • calculateE

        protected java.math.BigInteger calculateE​(java.math.BigInteger n,
                                          byte[] message)