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:Main.java

/**
 * <p>Treats the input as the MSB representation of a number, and discards
 * leading zero elements. For efficiency, the input is simply returned if no
 * leading zeroes are found.</p>//from  w w w . j ava 2 s.c  om
 *
 * @param n the {@link BigInteger} to trim.
 * @return the byte array representation of the designated {@link BigInteger}
 * with no leading 0-bytes.
 */
public static final byte[] trim(BigInteger n) {
    byte[] in = n.toByteArray();
    if (in.length == 0 || in[0] != 0) {
        return in;
    }
    int len = in.length;
    int i = 1;
    while (in[i] == 0 && i < len) {
        ++i;
    }
    byte[] result = new byte[len - i];
    System.arraycopy(in, i, result, 0, len - i);
    return result;
}

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From source file:mitm.common.util.MiscArrayUtils.java

/**
 * Converts the input string which is encoded in MAX_RADIX to a byte array (this function 
 * is the complement of ArrayUtils#toMaxRadix) 
 *///  w  w  w .java2  s  .  co m
public static byte[] fromMaxRadix(String inputMaxRadix) {
    Check.notNull(inputMaxRadix, "inputMaxRadix");

    BigInteger bigInt = new BigInteger(inputMaxRadix, Character.MAX_RADIX);

    byte[] bytes = bigInt.toByteArray();

    /*
     * We need to remove the first byte added by toMaxRadix.
     */
    return ArrayUtils.subarray(bytes, 1, bytes.length);
}

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From source file:org.ebayopensource.fido.uaf.crypto.KeyCodec.java

/**
 * Return the passed in value as an unsigned byte array.
 * //from   w w  w.  j av a  2  s. c o m
 * @param value value to be converted.
 * @return a byte array without a leading zero byte if present in the signed encoding.
 */
public static byte[] asUnsignedByteArray(BigInteger value) {
    byte[] bytes = value.toByteArray();

    if (bytes[0] == 0) {
        byte[] tmp = new byte[bytes.length - 1];

        System.arraycopy(bytes, 1, tmp, 0, tmp.length);

        return tmp;
    }

    return bytes;
}

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From source file:it.zero11.acme.utils.JWKUtils.java

private static byte[] toIntegerBytes(final BigInteger bigInt) {
    int bitlen = bigInt.bitLength();
    // round bitlen
    bitlen = ((bitlen + 7) >> 3) << 3;
    final byte[] bigBytes = bigInt.toByteArray();

    if (((bigInt.bitLength() % 8) != 0) && (((bigInt.bitLength() / 8) + 1) == (bitlen / 8))) {
        return bigBytes;
    }/*  w w w  .j  a  v  a2 s  .co m*/
    // 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--;
    }
    final int startDst = bitlen / 8 - len; // to pad w/ nulls as per spec
    final byte[] resizedBytes = new byte[bitlen / 8];
    System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, len);
    return resizedBytes;
}

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From source file:org.cloudfoundry.identity.uaa.oauth.jwk.JsonWebKeyHelper.java

public static JsonWebKey fromPEMPrivateKey(String key) {
    KeyPair pair = KeyInfo.parseKeyPair(key);
    RSAPublicKey rsaKey = (RSAPublicKey) pair.getPublic();
    BigInteger modulus = rsaKey.getModulus();
    BigInteger exponent = rsaKey.getPublicExponent();
    Map<String, Object> properties = new HashMap();
    properties.put("n", base64.encodeAsString(modulus.toByteArray()));
    properties.put("e", base64.encodeAsString(exponent.toByteArray()));
    properties.put("kty", "RSA");
    properties.put("use", sig.name());
    properties.put("value", KeyInfo.pemEncodePublicKey(rsaKey));
    return new JsonWebKey(properties);
}

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From source file:org.opentravel.schemacompiler.security.GenerateEncryptionKeys.java

/**
 * Saves the content of the given byte array to the indicated file location.
 * //from   ww w .  j av  a 2 s  .  co m
 * @param file
 *            the file to which the byte contents should be written
 * @param modulus
 *            the modulus of the encryption key
 * @param exponent
 *            the exponent of the encryption key
 * @throws IOException
 *             thrown if the file cannot be created
 */
private static void writeKeyFile(File file, BigInteger modulus, BigInteger exponent) throws IOException {
    PrintStream out = null;
    try {
        out = new PrintStream(new FileOutputStream(file));
        out.println(Base64.encodeBase64String(modulus.toByteArray()));
        out.println(Base64.encodeBase64String(exponent.toByteArray()));

    } finally {
        try {
            if (out != null)
                out.close();
        } catch (Throwable t) {
        }
    }
}

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From source file:com.swdouglass.joid.Crypto.java

/**
 * Converts a big integer to string./* ww  w  .j  a v a 2  s  . c  om*/
 *
 * @param b the big integer to convert.
 * @return the base 64 encoded string.
 */
public static String convertToString(BigInteger b) {
    return convertToString(b.toByteArray());
}

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From source file:org.keycloak.jose.jwk.JWKBuilder.java

/**
 * Copied from org.apache.commons.codec.binary.Base64
 *///w  w w.  j  ava2s. c  o m
private static byte[] toIntegerBytes(final BigInteger bigInt) {
    int bitlen = bigInt.bitLength();
    // round bitlen
    bitlen = ((bitlen + 7) >> 3) << 3;
    final 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--;
    }
    final int startDst = bitlen / 8 - len; // to pad w/ nulls as per spec
    final byte[] resizedBytes = new byte[bitlen / 8];
    System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, len);
    return resizedBytes;
}

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From source file:org.apache.spark.sql.execution.vectorized.ColumnVectorUtils.java

private static void appendValue(ColumnVector dst, DataType t, Object o) {
    if (o == null) {
        if (t instanceof CalendarIntervalType) {
            dst.appendStruct(true);/*from   w w  w .j  ava  2 s  .c o m*/
        } else {
            dst.appendNull();
        }
    } else {
        if (t == DataTypes.BooleanType) {
            dst.appendBoolean(((Boolean) o).booleanValue());
        } else if (t == DataTypes.ByteType) {
            dst.appendByte(((Byte) o).byteValue());
        } else if (t == DataTypes.ShortType) {
            dst.appendShort(((Short) o).shortValue());
        } else if (t == DataTypes.IntegerType) {
            dst.appendInt(((Integer) o).intValue());
        } else if (t == DataTypes.LongType) {
            dst.appendLong(((Long) o).longValue());
        } else if (t == DataTypes.FloatType) {
            dst.appendFloat(((Float) o).floatValue());
        } else if (t == DataTypes.DoubleType) {
            dst.appendDouble(((Double) o).doubleValue());
        } else if (t == DataTypes.StringType) {
            byte[] b = ((String) o).getBytes(StandardCharsets.UTF_8);
            dst.appendByteArray(b, 0, b.length);
        } else if (t instanceof DecimalType) {
            DecimalType dt = (DecimalType) t;
            Decimal d = Decimal.apply((BigDecimal) o, dt.precision(), dt.scale());
            if (dt.precision() <= Decimal.MAX_INT_DIGITS()) {
                dst.appendInt((int) d.toUnscaledLong());
            } else if (dt.precision() <= Decimal.MAX_LONG_DIGITS()) {
                dst.appendLong(d.toUnscaledLong());
            } else {
                final BigInteger integer = d.toJavaBigDecimal().unscaledValue();
                byte[] bytes = integer.toByteArray();
                dst.appendByteArray(bytes, 0, bytes.length);
            }
        } else if (t instanceof CalendarIntervalType) {
            CalendarInterval c = (CalendarInterval) o;
            dst.appendStruct(false);
            dst.getChildColumn(0).appendInt(c.months);
            dst.getChildColumn(1).appendLong(c.microseconds);
        } else if (t instanceof DateType) {
            dst.appendInt(DateTimeUtils.fromJavaDate((Date) o));
        } else {
            throw new NotImplementedException("Type " + t);
        }
    }
}

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From source file:org.apache.spark.sql.execution.vectorized.ColumnVectorUtils.java

/**
 * Populates the entire `col` with `row[fieldIdx]`
 *///from  w  w w.  j a v  a 2s. c  o  m
public static void populate(ColumnVector col, InternalRow row, int fieldIdx) {
    int capacity = col.capacity;
    DataType t = col.dataType();

    if (row.isNullAt(fieldIdx)) {
        col.putNulls(0, capacity);
    } else {
        if (t == DataTypes.BooleanType) {
            col.putBooleans(0, capacity, row.getBoolean(fieldIdx));
        } else if (t == DataTypes.ByteType) {
            col.putBytes(0, capacity, row.getByte(fieldIdx));
        } else if (t == DataTypes.ShortType) {
            col.putShorts(0, capacity, row.getShort(fieldIdx));
        } else if (t == DataTypes.IntegerType) {
            col.putInts(0, capacity, row.getInt(fieldIdx));
        } else if (t == DataTypes.LongType) {
            col.putLongs(0, capacity, row.getLong(fieldIdx));
        } else if (t == DataTypes.FloatType) {
            col.putFloats(0, capacity, row.getFloat(fieldIdx));
        } else if (t == DataTypes.DoubleType) {
            col.putDoubles(0, capacity, row.getDouble(fieldIdx));
        } else if (t == DataTypes.StringType) {
            UTF8String v = row.getUTF8String(fieldIdx);
            byte[] bytes = v.getBytes();
            for (int i = 0; i < capacity; i++) {
                col.putByteArray(i, bytes);
            }
        } else if (t instanceof DecimalType) {
            DecimalType dt = (DecimalType) t;
            Decimal d = row.getDecimal(fieldIdx, dt.precision(), dt.scale());
            if (dt.precision() <= Decimal.MAX_INT_DIGITS()) {
                col.putInts(0, capacity, (int) d.toUnscaledLong());
            } else if (dt.precision() <= Decimal.MAX_LONG_DIGITS()) {
                col.putLongs(0, capacity, d.toUnscaledLong());
            } else {
                final BigInteger integer = d.toJavaBigDecimal().unscaledValue();
                byte[] bytes = integer.toByteArray();
                for (int i = 0; i < capacity; i++) {
                    col.putByteArray(i, bytes, 0, bytes.length);
                }
            }
        } else if (t instanceof CalendarIntervalType) {
            CalendarInterval c = (CalendarInterval) row.get(fieldIdx, t);
            col.getChildColumn(0).putInts(0, capacity, c.months);
            col.getChildColumn(1).putLongs(0, capacity, c.microseconds);
        } else if (t instanceof DateType) {
            Date date = (Date) row.get(fieldIdx, t);
            col.putInts(0, capacity, DateTimeUtils.fromJavaDate(date));
        }
    }
}

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