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 bi = value.unscaledValue();
        Integer scale = value.scale();
        byte[] bibytes = bi.toByteArray();
        byte[] sbytes = ByteBufferUtil.bytes(scale).array();
        byte[] bytes = new byte[bi.toByteArray().length+4];
        
        for (int i = 0 ; i < 4 ; i++) bytes[i] = sbytes[i];
        for (int i = 4 ; i < bibytes.length+4 ; i++) bytes[i] = bibytes[i-4];
        
        return ByteBuffer.wrap(bytes);

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        }


        if (!kekOnly) {
            // public key (just Y)
            BigInteger y = publicKey.getY();
            byte[] yBytes = y.toByteArray();
            String yHex = StringUtil.toHexString(yBytes);
            buf.append("======== Begin Public Key (Y @ ").append(yBytes.length).append(" / ").append(yHex.length()).append(") ========\n");
            buf.append(yHex).append("\n");
            buf.append("======== End Public Key ========\n\n");

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            buf.append(yHex).append("\n");
            buf.append("======== End Public Key ========\n\n");


            // private key (just X)
            BigInteger x = privateKey.getX();
            byte[] xBytes = x.toByteArray();
            String xHex = StringUtil.toHexString(xBytes);
            buf.append("======== Begin Private Key (X @ ").append(xBytes.length).append(" / ").append(xHex.length()).append(") ========\n");
            buf.append(xHex).append("\n");
            buf.append("======== End Private Key ========\n\n");

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    public void testInteger()
    {
        BigInteger bi = new BigInteger("1");
        assert bi.intValue() == 1;
        assert IntegerType.instance.getString(IntegerType.instance.fromString("1")).equals("1");
        assert IntegerType.instance.fromString(IntegerType.instance.getString(ByteBuffer.wrap(bi.toByteArray())))
                .equals(ByteBuffer.wrap(bi.toByteArray()));
        assert IntegerType.instance.compose(ByteBuffer.wrap(bi.toByteArray())).equals(bi);
        assert JdbcInteger.instance.toString(bi).equals("1");
    }

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    {
        BigInteger bi = new BigInteger("1");
        assert bi.intValue() == 1;
        assert IntegerType.instance.getString(IntegerType.instance.fromString("1")).equals("1");
        assert IntegerType.instance.fromString(IntegerType.instance.getString(ByteBuffer.wrap(bi.toByteArray())))
                .equals(ByteBuffer.wrap(bi.toByteArray()));
        assert IntegerType.instance.compose(ByteBuffer.wrap(bi.toByteArray())).equals(bi);
        assert JdbcInteger.instance.toString(bi).equals("1");
    }


    @Test

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        BigInteger bi = new BigInteger("1");
        assert bi.intValue() == 1;
        assert IntegerType.instance.getString(IntegerType.instance.fromString("1")).equals("1");
        assert IntegerType.instance.fromString(IntegerType.instance.getString(ByteBuffer.wrap(bi.toByteArray())))
                .equals(ByteBuffer.wrap(bi.toByteArray()));
        assert IntegerType.instance.compose(ByteBuffer.wrap(bi.toByteArray())).equals(bi);
        assert JdbcInteger.instance.toString(bi).equals("1");
    }


    @Test
    public void testLong()

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        scale = 0;
        value = value.setScale(0);
      }


      BigInteger bi = value.unscaledValue();
      byteArray = bi.toByteArray();
    } else {
      scale = rawScale;
      byteArray = rawData;
    }

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        i++;
        if (i == 0) return a;
        if (i == num + 1) return b;


        BigInteger curBI = startBI.add(intervalBI.multiply(BigInteger.valueOf(i)));
        byte [] padded = curBI.toByteArray();
        if (padded[1] == 0)
          padded = tail(padded, padded.length - 2);
        else
          padded = tail(padded, padded.length - 1);
        return padded;

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        i++;
        if (i == 0) return a;
        if (i == num + 1) return b;


        BigInteger curBI = startBI.add(intervalBI.multiply(BigInteger.valueOf(i)));
        byte [] padded = curBI.toByteArray();
        if (padded[1] == 0)
          padded = tail(padded, padded.length - 2);
        else
          padded = tail(padded, padded.length - 1);
        return padded;

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    BigInteger aNumber = new BigInteger(aSign, aBytes);
    BigInteger exp =    new BigInteger(eSign, eBytes);
    BigInteger modulus = new BigInteger(mSign, mBytes);
    BigInteger result = aNumber.modPow(exp, modulus);
    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }

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