Examples of java.math.BigInteger.toByteArray()

java.math.BigInteger.toByteArray()
Returns a byte array containing the two's-complement representation of this BigInteger. The byte array will be in big-endian byte-order: the most significant byte is in the zeroth element. The array will contain the minimum number of bytes required to represent this BigInteger, including at least one sign bit, which is {@code (ceil((this.bitLength() +1)/8))}. (This representation is compatible with the {@link #BigInteger(byte[]) (byte[])} constructor.) @return a byte array containing the two's-complement representation ofthis BigInteger. @see #BigInteger(byte[])

      BigInteger B_v = B.subtract(v);
      if( log.isTraceEnabled() )
         log.trace("B - v: "+CryptoUtil.tob64(B_v.toByteArray()));
      BigInteger a_ux = a.add(u.multiply(x));
      if( log.isTraceEnabled() )
         log.trace("a + u * x: "+CryptoUtil.tob64(a_ux.toByteArray()));
      BigInteger S = B_v.modPow(a_ux, N);
      if( log.isTraceEnabled() )
         log.trace("S: "+CryptoUtil.tob64(S.toByteArray()));
      // K = SessionHash(S)
      MessageDigest sessionDigest = MessageDigest.getInstance(params.hashAlgorithm);

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      BigInteger a_ux = a.add(u.multiply(x));
      if( log.isTraceEnabled() )
         log.trace("a + u * x: "+CryptoUtil.tob64(a_ux.toByteArray()));
      BigInteger S = B_v.modPow(a_ux, N);
      if( log.isTraceEnabled() )
         log.trace("S: "+CryptoUtil.tob64(S.toByteArray()));
      // K = SessionHash(S)
      MessageDigest sessionDigest = MessageDigest.getInstance(params.hashAlgorithm);
      K = sessionDigest.digest(S.toByteArray());
      if( log.isTraceEnabled() )
         log.trace("K: "+CryptoUtil.tob64(K));

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      }


      TstImpl(char[] password, String salt)
      {
         BigInteger N = SRPConf.getDefaultParams().N();
         log.trace("N: "+Util.tob64(N.toByteArray()));
         BigInteger g = SRPConf.getDefaultParams().g();
         log.trace("g: "+Util.tob64(g.toByteArray()));
         byte[] Nb = SRPConf.getDefaultParams().Nbytes();
         log.trace("N': "+Util.tob64(params.N));
         byte[] gb = SRPConf.getDefaultParams().gbytes();

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      BigInteger S = B_v.modPow(a_ux, N);
      if( log.isTraceEnabled() )
         log.trace("S: "+CryptoUtil.tob64(S.toByteArray()));
      // K = SessionHash(S)
      MessageDigest sessionDigest = MessageDigest.getInstance(params.hashAlgorithm);
      K = sessionDigest.digest(S.toByteArray());
      if( log.isTraceEnabled() )
         log.trace("K: "+CryptoUtil.tob64(K));
      // clientHash = H(N) xor H(g) | H(U) | A | B | K
      clientHash.update(K);
      byte[] M1 = clientHash.digest();

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      TstImpl(char[] password, String salt)
      {
         BigInteger N = SRPConf.getDefaultParams().N();
         log.trace("N: "+Util.tob64(N.toByteArray()));
         BigInteger g = SRPConf.getDefaultParams().g();
         log.trace("g: "+Util.tob64(g.toByteArray()));
         byte[] Nb = SRPConf.getDefaultParams().Nbytes();
         log.trace("N': "+Util.tob64(params.N));
         byte[] gb = SRPConf.getDefaultParams().gbytes();
         log.trace("g': "+Util.tob64(params.g));
         byte[] hn = Util.newDigest().digest(params.N);

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      signatureInt = Rsa.doPublic(signatureInt,
                                  getModulus(), publicExponent);


      signatureInt = Rsa.removePKCS1(signatureInt, 1);


      signature = signatureInt.toByteArray();


      SHA1Digest h = new SHA1Digest();
      h.update(msg, 0, msg.length);
      byte[] data = new byte[h.getDigestSize()];
      h.doFinal(data, 0);

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            if (key instanceof RsaPublicKey) {


                BigInteger padded = Rsa.padPKCS1(input, 0x02, 128);
                BigInteger s = Rsa.doPublic(padded, ((RsaPublicKey) key).getModulus(), ((RsaPublicKey) key).getPublicExponent());


                secret = s.toByteArray();
            } else {
                throw new SSLException(SSLException.UNSUPPORTED_CERTIFICATE);
            }
        } catch (CertificateException ex) {
            throw new SSLException(SSLException.UNSUPPORTED_CERTIFICATE, ex.getMessage());

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                            BigInteger input = new BigInteger(blob);
                            RsaPublicKey r = (RsaPublicKey) trusted.getPublicKey();
                            BigInteger decoded = Rsa.doPublic(input, r.getModulus(), r.getPublicExponent());
                            BigInteger result = Rsa.removePKCS1(decoded, 0x01);
                            byte[] sig = result.toByteArray();


                            MD5Digest digest = new MD5Digest();
                            digest.update(x509.getTBSCertificate(), 0, x509.getTBSCertificate().length);
                            byte[] hash = new byte[digest.getDigestSize()];
                            digest.doFinal(hash, 0);

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                            RsaPublicKey r = (RsaPublicKey) trusted.getPublicKey();


                            BigInteger decoded = Rsa.doPublic(input, r.getModulus(), r.getPublicExponent());


                            BigInteger result = Rsa.removePKCS1(decoded, 0x01);
                            byte[] sig = result.toByteArray();


                            SHA1Digest digest = new SHA1Digest();
                            digest.update(x509.getTBSCertificate(), 0, x509.getTBSCertificate().length);
                            byte[] hash = new byte[digest.getDigestSize()];
                            digest.doFinal(hash, 0);

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    protected void writeDecimal(BigDecimal o, Type type) {


        int        scale   = o.scale();
        BigInteger bigint  = JavaSystem.unscaledValue(o);
        byte[]     bytearr = bigint.toByteArray();


        writeByteArray(bytearr);
        writeInt(scale);
    }

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