java.math
BigInteger

Java 8 BigInteger - top ranked examples from Open Source projects

These code examples were ranked by Codota’s semantic indexing as the best open source examples for Java 8 BigInteger class.

githubCode example from Github project apache/cassandra, RoundTripTest.java »
This code example shows how to use the following methods:intValue, toByteArray
public class RoundTripTest 
{ 
    @Test 
    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 IntegerSerializer.instance.toString(bi).equals("1");
    } 
 
    @Test 
    public void testLong() 
    { 
        byte[] v = new byte[]{0,0,0,0,0,0,0,1};
        assert LongType.instance.getString(LongType.instance.fromString("1")).equals("1"); 
        assert LongType.instance.fromString(LongType.instance.getString(ByteBuffer.wrap(v)))
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githubCode example from Github project wildfly/wildfly, ModelTypeValidatorUnitTestCase.java »
This code example shows how to use the following methods:add, subtract
    } 
 
    private static void invalidateIntRange(ModelTypeValidator testee) {
        assertInvalid(testee, new ModelNode().set(BigDecimal.valueOf(Integer.MAX_VALUE).add(BigDecimal.ONE)));
        assertInvalid(testee, new ModelNode().set(BigDecimal.valueOf(Integer.MIN_VALUE).subtract(BigDecimal.ONE)));
        assertInvalid(testee, new ModelNode().set(BigInteger.valueOf(Integer.MAX_VALUE).add(BigInteger.ONE)));
        assertInvalid(testee, new ModelNode().set(BigInteger.valueOf(Integer.MIN_VALUE).subtract(BigInteger.ONE)));
        assertInvalid(testee, new ModelNode().set(Integer.MAX_VALUE + 1L));
        assertInvalid(testee, new ModelNode().set(Integer.MIN_VALUE - 1L));
        assertInvalid(testee, new ModelNode().set(Integer.MAX_VALUE + 1d));
        assertInvalid(testee, new ModelNode().set(Integer.MIN_VALUE - 1d));
    } 
 
    private static void invalidateLongRange(ModelTypeValidator testee) {
        assertInvalid(testee, new ModelNode().set(BigDecimal.valueOf(Long.MAX_VALUE).add(BigDecimal.ONE)));
        assertInvalid(testee, new ModelNode().set(BigDecimal.valueOf(Long.MIN_VALUE).subtract(BigDecimal.ONE)));
        assertInvalid(testee, new ModelNode().set(BigInteger.valueOf(Long.MAX_VALUE).add(BigInteger.ONE)));
        assertInvalid(testee, new ModelNode().set(BigInteger.valueOf(Long.MIN_VALUE).subtract(BigInteger.ONE)));
        assertInvalid(testee, new ModelNode().set(Long.MAX_VALUE * 10d));
        assertInvalid(testee, new ModelNode().set(Long.MIN_VALUE * 10d));
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githubCode example from Github project apache/cassandra, IntegerType.java »
This code example shows how to use the following methods:
 
        BigInteger integerType;
 
        try 
        { 
            integerType = new BigInteger(source);
        } 
        catch (Exception e)
        { 
            throw new MarshalException(String.format("unable to make int from '%s'", source), e);
        } 
 
        return decompose(integerType);
    } 
 
    public CQL3Type asCQL3Type() 
    { 
        return CQL3Type.Native.VARINT; 
    } 
 
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githubCode example from Github project barmstrong/bitcoin-android, ECMQVBasicAgreement.java »
This code example shows how to use the following methods:bitLength, mod
        ECPublicKeyParameters   Q2U,
        ECPublicKeyParameters   Q1V,
        ECPublicKeyParameters   Q2V)
    { 
        BigInteger n = parameters.getN();
        int e = (n.bitLength() + 1) / 2;
        BigInteger powE = ECConstants.ONE.shiftLeft(e);
 
        // The Q2U public key is optional 
        ECPoint q;
        if (Q2U == null)
        { 
            q = parameters.getG().multiply(d2U.getD());
        } 
        else 
        { 
            q = Q2U.getQ();
        } 
 
        BigInteger x = q.getX().toBigInteger();

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githubCode example from Github project barmstrong/bitcoin-android, DSASigner.java »
This code example shows how to use the following methods:compareTo, modInverse
        BigInteger      k;
        int                  qBitLength = params.getQ().bitLength();
 
        do  
        { 
            k = new BigInteger(qBitLength, random);
        } 
        while (k.compareTo(params.getQ()) >= 0);
 
        BigInteger  r = params.getG().modPow(k, params.getP()).mod(params.getQ());
 
        k = k.modInverse(params.getQ()).multiply(
                    m.add(((DSAPrivateKeyParameters)key).getX().multiply(r)));
 
        BigInteger  s = k.mod(params.getQ());
 
        BigInteger[]  res = new BigInteger[2];
 
        res[0] = r;
        res[1] = s;
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githubCode example from Github project hibernate/hibernate-orm, UUIDGenerator.java »
This code example shows how to use the following methods:toString
        UUID uuid = UUID.randomUUID();
        String sud = uuid.toString();
        System.out.println("uuid="+uuid);
        sud = sud.replaceAll("-", "");
         
        BigInteger integer = new BigInteger(sud,16);
 
        System.out.println("bi ="+integer.toString() );
        return integer;
    } 
 
} 
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githubCode example from Github project nostra13/Android-Universal-Image-Loader, Md5FileNameGenerator.java »
This code example shows how to use the following methods:
	private static final int RADIX = 10 + 26; // 10 digits + 26 letters
 
	@Override 
	public String generate(String imageUri) {
		byte[] md5 = getMD5(imageUri.getBytes());
		BigInteger bi = new BigInteger(md5).abs();
		return bi.toString(RADIX);
	} 
 
	private byte[] getMD5(byte[] data) {
		byte[] hash = null;
		try { 
			MessageDigest digest = MessageDigest.getInstance(HASH_ALGORITHM);
			digest.update(data);
			hash = digest.digest();
		} catch (NoSuchAlgorithmException e) {
			L.e(e);
		} 
		return hash;
	} 
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githubCode example from Github project bcgit/bc-java, DetDSATest.java »
This code example shows how to use the following methods:equals
        KeyFactory keyFact = KeyFactory.getInstance("DSA", "BC");
 
        PrivateKey privKey = keyFact.generatePrivate(privKeySpec);
 
        doTestHMACDetDSASample("SHA1withDETDSA", privKey, new BigInteger("2E1A0C2562B2912CAAF89186FB0F42001585DA55", 16), new BigInteger("29EFB6B0AFF2D7A68EB70CA313022253B9A88DF5", 16));
        doTestHMACDetDSASample("SHA224withDETDSA", privKey, new BigInteger("4BC3B686AEA70145856814A6F1BB53346F02101E", 16), new BigInteger("410697B92295D994D21EDD2F4ADA85566F6F94C1", 16));
        doTestHMACDetDSASample("SHA256withDETDSA", privKey, new BigInteger("81F2F5850BE5BC123C43F71A3033E9384611C545", 16), new BigInteger("4CDD914B65EB6C66A8AAAD27299BEE6B035F5E89", 16));
        doTestHMACDetDSASample("SHA384withDETDSA", privKey, new BigInteger("07F2108557EE0E3921BC1774F1CA9B410B4CE65A", 16), new BigInteger("54DF70456C86FAC10FAB47C1949AB83F2C6F7595", 16));
        doTestHMACDetDSASample("SHA512withDETDSA", privKey, new BigInteger("16C3491F9B8C3FBBDD5E7A7B667057F0D8EE8E1B", 16), new BigInteger("02C36A127A7B89EDBB72E4FFBC71DABC7D4FC69C", 16));
    } 
 
    private void doTestHMACDetDSASample(String algName, PrivateKey privKey, BigInteger r, BigInteger s)
        throws Exception 
    { 
        doTestHMACDetECDSA(Signature.getInstance(algName, "BC"), SAMPLE, privKey, r, s);
    } 
 
    // test vectors from appendix in RFC 6979 
    private void testECHMacDeterministic() 
        throws Exception 

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githubCode example from Github project bcgit/bc-java, HMacDSAKCalculator.java »
This code example shows how to use the following methods:compareTo, subtract, toByteArray
    private static final BigInteger ZERO = BigInteger.valueOf(0);
 
    private final HMac hMac;
    private final byte[] K;
    private final byte[] V;
 
    private BigInteger n;
 
    /** 
     * Base constructor. 
     * 
     * @param digest digest to build the HMAC on. 
     */ 
    public HMacDSAKCalculator(Digest digest)
    { 
        this.hMac = new HMac(digest);
        this.V = new byte[hMac.getMacSize()];
        this.K = new byte[hMac.getMacSize()];
    } 
 
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githubCode example from Github project floodlight/floodlight, HexString.java »
This code example shows how to use the following methods:bitLength, longValue
        return ret;
    } 
     
    public static long toLong(String values) throws NumberFormatException {
        // Long.parseLong() can't handle HexStrings with MSB set. Sigh.  
        BigInteger bi = new BigInteger(values.replaceAll(":", ""),16);
        if (bi.bitLength() > 64) 
            throw new NumberFormatException("Input string too big to fit in long: " + values);
        return bi.longValue();
    } 
 
} 
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More examples ⏬

Related Java 8 BigInteger Questions & Answers:

how to convert binary data to image? 
1:	 BigInteger bigInt = new BigInteger(s, 2);
2:	byte[] binaryData = bigInt.toByteArray();
-
1:	 BigInteger bigInt = new BigInteger(s, 2);
2:	byte[] binaryData = bigInt.toByteArray();

I'm not really sure what you want.

  • If you want to create a Bitmap-instance directly from the stream you can use BitmapFactory and display that Bitmap in an ImageView-instance afterwards:

    Bitmap image = BitmapFactory.decodeStream(stream);
imageView.setImageBitmap(image);

  • If you want to convert your string representation with radix 2 back to a binary array you can use BigInteger too:

    BigInteger bigInt = new BigInteger(s, 2);
byte[] binaryData = bigInt.toByteArray();

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Big difference in timestamps when running same application multiple times on an emulator 
1:	 long start = System.currentTimeMillis();
2:	BigInteger en = big.modPow(e, n);
3:	long end = System.currentTimeMillis();

Well for one thing, you're going about your timing in a very convoluted way. Here's something which gives just as much accuracy, but rather simpler:

long start = System.currentTimeMillis();
BigInteger en = big.modPow(e, n);
long end = System.currentTimeMillis();

Note that java.util.Date only has accuracy to the nearest millisecond, and using that same value and putting it in a java.sql.Timestamp doesn't magically make it more accurate. So any result under a millisecond (6ns-200ns) is obviously spurious - basically anything under a millisecond is 0.

You may be able to get a more accurate reading using System.nanoTime - I don't know whether that's supported on Android. There may be alternative high-precision timers available, too.

Now as for why operations may actually take very different amounts of recorded time:

  • The granularity of the system clock used above may well be considerably less than 1ms. For example, if it measures nothing smaller than 15ms, you could see some operations supposedly taking 0ms and some taking 15ms, even though they actually take the same amount of time.
  • There can easily be other factors involved, the most obvious being garbage collection

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Loading a BigInteger with a large, positive, number 
1:	 BigInteger b = BigInteger.valueOf(0x990951BAl);

long is 64-bit in Java, so you should be able to use it as a direct substitute for UInt64. To specify a long literal, append an l to the constant to have it recognized as long rather than int.

BigInteger b = BigInteger.valueOf(0x990951BAl);

A fallback for values which are too big even for long is to parse it as text.

BigInteger b = new BigInteger("990951BA", 16);

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String.getBytes("UTF-32") returns different results on JVM and Dalvik VM 
1:	 String s = "346a23652a46392b4d73257c67317e352e3372482177652c";
2:	byte[] bytes = new BigInteger(s, 16).toByteArray();
3:	String s2 = new BigInteger(1, bytes).toString(16);
4:	System.out.println("Strings match is "+s.equals(s2)+" length "+bytes.length);
-
1:	 String s = "346a23652a46392b4d73257c67317e352e3372482177652c";
2:	byte[] bytes = new BigInteger(s, 16).toByteArray();
3:	String s2 = new BigInteger(1, bytes).toString(16);
4:	System.out.println("Strings match is "+s.equals(s2)+" length "+bytes.length);

Why would you UTF-32 encode plain a hexidecimal number. Thats 8x larger than it needs to be. :P

String s = "346a23652a46392b4d73257c67317e352e3372482177652c";
byte[] bytes = new BigInteger(s, 16).toByteArray();
String s2 = new BigInteger(1, bytes).toString(16);
System.out.println("Strings match is "+s.equals(s2)+" length "+bytes.length);

prints

Strings match is true length 24

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Convert 11 byte hex string to byte array of size 16 
1:	 String s = "0017333032CD4900186F41";
2:	BigInteger bi = new BigInteger(s, 16);
3:	byte[] a1 = bi.toByteArray();
4:	byte[] a2 = new byte[16];
-
1:	 String s = "0017333032CD4900186F41";
2:	BigInteger bi = new BigInteger(s, 16);
3:	byte[] a1 = bi.toByteArray();
4:	byte[] a2 = new byte[16];

try 

String s = "0017333032CD4900186F41";
BigInteger bi = new BigInteger(s, 16);
byte[] a1 = bi.toByteArray();
byte[] a2 = new byte[16];
System.arraycopy(a1, 0, a2, 16 - a1.length, a1.length);

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See Code Examples for Java 8 BigInteger Methods:
  • equals(124)
    Compares this BigInteger with the specified Object for equality.
  • multiply(96)
    Returns a BigInteger whose value is (this * val).
  • subtract(86)
    Returns a BigInteger whose value is (this - val).
  • toString(86)
    Returns the decimal String representation of this BigInteger.
add (81) | toByteArray (79) | signum (75) | bitLength (64) | modPow (61) | divide (61) | hashCode (60) | longValue (59) | mod (56) | intValue (48)
Popular Java 8 Classes