Example usage for java.math BigInteger toByteArray

Introduction

In this page you can find the example usage for java.math BigInteger toByteArray.

Prototype

public byte[] toByteArray() 

Source Link

Document

Returns a byte array containing the two's-complement representation of this BigInteger.

Usage

From source file:com.android.email.codec.binary.Base64.java

/**
 * Returns a byte-array representation of a <code>BigInteger</code>
 * without sign bit.//from   www  .  j  a  v  a  2  s .com
 *
 * @param bigInt <code>BigInteger</code> to be converted
 * @return a byte array representation of the BigInteger parameter
 */
static byte[] toIntegerBytes(BigInteger bigInt) {
    int bitlen = bigInt.bitLength();
    // round bitlen
    bitlen = ((bitlen + 7) >> 3) << 3;
    byte[] bigBytes = bigInt.toByteArray();

    if (((bigInt.bitLength() % 8) != 0) && (((bigInt.bitLength() / 8) + 1) == (bitlen / 8))) {
        return bigBytes;
    }

    // set up params for copying everything but sign bit
    int startSrc = 0;
    int len = bigBytes.length;

    // if bigInt is exactly byte-aligned, just skip signbit in copy
    if ((bigInt.bitLength() % 8) == 0) {
        startSrc = 1;
        len--;
    }

    int startDst = bitlen / 8 - len; // to pad w/ nulls as per spec
    byte[] resizedBytes = new byte[bitlen / 8];

    System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, len);

    return resizedBytes;
}

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From source file:com.coroptis.coidi.core.services.impl.ConvertorServiceImpl.java

@Override
public String convertToString(BigInteger b) {
    return convertToString(b.toByteArray());
}

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From source file:com.og.elliptic.sdk.main.java

private static void elGamalString(WeierStrassCurve curve) {
    // Droulement de El Gamal
    // Cryptage/*from w ww .j a va  2s.  c  om*/
    PointGMP generateur = new PointGMP(curve.getGx(), curve.getGy(), curve);// le point gnrateur qui servira  calculer notre clef
    // secrte
    Random rnd = new Random();

    BigInteger clefSecrete = BigInteger.probablePrime(7, rnd);
    PointGMP publicKey = generateur.mult(clefSecrete);// on calcule notre clef secrte, qui nous servira  crypter les messages (h)

    BigInteger m = new BigInteger(Base64.decodeBase64("bonjour lesil"));

    BigInteger k = BigInteger.probablePrime(7, rnd);// on choisit un k random

    PointGMP C1 = generateur.mult(k);// on multiplie le gnrateur par k
    PointGMP tmp = publicKey.mult(k);
    BigInteger C2 = m.add(tmp.getX());// on multiplie notre clef secrte par k

    // Dcryptage
    PointGMP temp = C1.mult(clefSecrete);// on multiplie C1 par notre clef secrte
    BigInteger messageTraduit = C2.subtract(temp.getX());// et on obtient le message en ajoutant m2 avec l'oppos de temp
    messageTraduit = messageTraduit.mod(curve.getP());

    if (m == messageTraduit)
        System.out.println("El Gamal fonctionnel");
    else
        System.out.println("El Gamal non fonctionnel");

    System.out.println("Message a retrouver " + m + " " + Base64.encodeBase64String(m.toByteArray()) + "\n");
    System.out.println("Resultat El gamal " + messageTraduit + " "
            + Base64.encodeBase64String(messageTraduit.toByteArray()) + "\n");

}

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From source file:co.rsk.blockchain.utils.BlockGenerator.java

public static Block createChildBlock(Block parent, List<Transaction> txs, List<BlockHeader> uncles,
        long difficulty, BigInteger minGasPrice) {
    if (txs == null)
        txs = new ArrayList<>();
    if (uncles == null)
        uncles = new ArrayList<>();

    Bloom logBloom = new Bloom();
    byte[] bidiff = BigInteger.valueOf(difficulty).toByteArray();
    byte[] unclesListHash = HashUtil.sha3(BlockHeader.getUnclesEncodedEx(uncles));

    BlockHeader newHeader = new BlockHeader(parent.getHash(), unclesListHash, parent.getCoinbase(),
            ByteUtils.clone(new Bloom().getData()), new byte[] { 1 }, parent.getNumber() + 1,
            parent.getGasLimit(), 0, parent.getTimestamp() + ++count, new byte[] {}, new byte[] {},
            new byte[] {}, new byte[] {}, (minGasPrice != null) ? minGasPrice.toByteArray() : null,
            CollectionUtils.size(uncles));

    if (difficulty == 0)
        newHeader.setDifficulty(newHeader.calcDifficulty(parent.getHeader()).toByteArray());
    else//  ww  w  .  jav a2s.  c  o m
        newHeader.setDifficulty(BigInteger.valueOf(difficulty).toByteArray());

    newHeader.setTransactionsRoot(Block.getTxTrie(txs).getHash());

    newHeader.setStateRoot(parent.getStateRoot());

    Block newBlock = new Block(newHeader, txs, uncles);

    return newBlock;
}

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From source file:org.rifidi.emulator.tags.impl.C0G1Tag.java

public C0G1Tag(BigInteger id) {
    super();
    this.id = id.toByteArray();
}

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From source file:com.l2jfree.tools.math.ScrambledKeyPair.java

private byte[] scrambleModulus(BigInteger modulus) {
    byte[] retScrambledModulus = modulus.toByteArray();

    if (retScrambledModulus.length == 0x81 && retScrambledModulus[0] == 0x00) {
        byte[] temp = new byte[0x80];
        System.arraycopy(retScrambledModulus, 1, temp, 0, 0x80);
        retScrambledModulus = temp;//from  ww w .  jav a  2 s .c  om
    }
    // step 1 : 0x4d-0x50 <-> 0x00-0x04
    for (int i = 0; i < 4; i++) {
        byte temp = retScrambledModulus[0x00 + i];
        retScrambledModulus[0x00 + i] = retScrambledModulus[0x4d + i];
        retScrambledModulus[0x4d + i] = temp;
    }
    // step 2 : xor first 0x40 bytes with last 0x40 bytes
    for (int i = 0; i < 0x40; i++) {
        retScrambledModulus[i] = (byte) (retScrambledModulus[i] ^ retScrambledModulus[0x40 + i]);
    }
    // step 3 : xor bytes 0x0d-0x10 with bytes 0x34-0x38
    for (int i = 0; i < 4; i++) {
        retScrambledModulus[0x0d + i] = (byte) (retScrambledModulus[0x0d + i] ^ retScrambledModulus[0x34 + i]);
    }
    // step 4 : xor last 0x40 bytes with first 0x40 bytes
    for (int i = 0; i < 0x40; i++) {
        retScrambledModulus[0x40 + i] = (byte) (retScrambledModulus[0x40 + i] ^ retScrambledModulus[i]);
    }
    if (_log.isDebugEnabled())
        _log.debug("Modulus was scrambled");

    return retScrambledModulus;
}

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From source file:org.calrissian.mango.types.encoders.lexi.BigIntegerEncoder.java

@Override
public String encode(BigInteger value) {
    checkNotNull(value, "Null values are not allowed");

    byte[] bytes = value.toByteArray();
    int length = bytes.length;

    //Length is always positive so use it to encode the actual sign of the big int.
    if (value.signum() < 0)
        length = -length;/*  w w w  .jav a 2  s .co  m*/

    return integerEncoder.encode(length) + new String(encodeHex(bytes));
}

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From source file:cl.niclabs.tscrypto.common.datatypes.BigIntegerBase64TypeAdapter.java

@Override
public JsonElement serialize(BigInteger src, Type typeOfSrc, JsonSerializationContext context) {
    return new JsonPrimitive(new String(Base64.encodeBase64(src.toByteArray())));
}

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From source file:org.rifidi.edge.readerplugin.awid.awid2010.communication.messages.Gen2ReadBlockDataResponse.java

@Override
public TagReadEvent getTagReadEvent() {
    EPCGeneration2Event gen2Event = new EPCGeneration2Event();
    byte[] shiftedmessage = new byte[super.rawmessage.length];
    BigInteger bi = new BigInteger(super.rawmessage);
    BigInteger bi2 = bi.shiftLeft(1);

    shiftedmessage = bi2.toByteArray();
    if (memorybank == 0) {
        logger.debug("Reserved Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        //TODO: put bytes in reserved mem bank
    } else if (memorybank == 1) {
        logger.debug("EPC Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        //TODO: what if we don't have 96 bits?
        gen2Event.setEPCMemory(new BigInteger(Arrays.copyOfRange(shiftedmessage, 7, 19)), 12 * 8);
    } else if (memorybank == 2) {
        logger.debug("TID Memory Bank " + new String(Hex.encodeHex(shiftedmessage)));

        // TODO: this is not quite correct since it assumes that we have 96
        // bits/*from   w w  w . j  a v  a  2s .  c  om*/
        gen2Event.setTIDMemory(new BigInteger(Arrays.copyOfRange(shiftedmessage, 3, 17)), 12 * 8);
    } else if (memorybank == 3) {
        logger.debug("User Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        // TODO: insert into user memory
    }

    TagReadEvent tre;
    if (super.rawmessage.length == 22) {
        logger.debug("AntennaID " + super.rawmessage[19]);
        tre = new TagReadEvent(readerID, gen2Event, super.rawmessage[19], timestamp);
    } else {
        logger.warn("No Antenna byte, assuming default value of " + 1);
        tre = new TagReadEvent(readerID, gen2Event, 1, timestamp);
    }
    return tre;
}

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From source file:org.rifidi.edge.adapter.awid.awid2010.communication.messages.Gen2ReadBlockDataResponse.java

@Override
public TagReadEvent getTagReadEvent() {
    EPCGeneration2Event gen2Event = new EPCGeneration2Event();
    byte[] shiftedmessage = new byte[super.rawmessage.length];
    BigInteger bi = new BigInteger(super.rawmessage);
    BigInteger bi2 = bi.shiftLeft(1);

    shiftedmessage = bi2.toByteArray();
    if (memorybank == 0) {
        logger.debug("Reserved Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        //TODO: put bytes in reserved mem bank
    } else if (memorybank == 1) {
        logger.debug("EPC Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        //TODO: what if we don't have 96 bits?
        BigInteger epc = new BigInteger(Arrays.copyOfRange(shiftedmessage, 7, 19));
        gen2Event.setEPCMemory(epc, epc.toString(16), 12 * 8);
    } else if (memorybank == 2) {
        logger.debug("TID Memory Bank " + new String(Hex.encodeHex(shiftedmessage)));

        // TODO: this is not quite correct since it assumes that we have 96
        // bits/*from w w  w .  j  av a2s  . c o m*/
        gen2Event.setTIDMemory(new BigInteger(Arrays.copyOfRange(shiftedmessage, 3, 17)), 12 * 8);
    } else if (memorybank == 3) {
        logger.debug("User Memory Bank" + new String(Hex.encodeHex(shiftedmessage)));
        // TODO: insert into user memory
    }

    TagReadEvent tre;
    if (super.rawmessage.length == 22) {
        logger.debug("AntennaID " + super.rawmessage[19]);
        tre = new TagReadEvent(readerID, gen2Event, super.rawmessage[19], timestamp);
    } else {
        logger.warn("No Antenna byte, assuming default value of " + 1);
        tre = new TagReadEvent(readerID, gen2Event, 1, timestamp);
    }
    return tre;
}

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