Package org.bouncycastle.pqc.legacy.math.linearalgebra

Class LittleEndianConversions

java.lang.Object
org.bouncycastle.pqc.legacy.math.linearalgebra.LittleEndianConversions
public final class LittleEndianConversions extends Object
This is a utility class containing data type conversions using little-endian byte order.
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    static byte[]
    I2OSP(int x)
    Convert an integer to an octet string of length 4.
    static void
    I2OSP(int value, byte[] output, int outOff)
    Convert an integer into a byte array beginning at the specified offset.
    static void
    I2OSP(int value, byte[] output, int outOff, int outLen)
    Convert an integer to a byte array beginning at the specified offset.
    static byte[]
    I2OSP(long input)
    Convert an integer to a byte array of length 8.
    static void
    I2OSP(long input, byte[] output, int outOff)
    Convert an integer to a byte array of length 8.
    static int
    OS2IP(byte[] input)
    Convert an octet string of length 4 to an integer.
    static int
    OS2IP(byte[] input, int inOff)
    Convert an byte array of length 4 beginning at offset into an integer.
    static int
    OS2IP(byte[] input, int inOff, int inLen)
    Convert a byte array of the given length beginning at offset into an integer.
    static long
    OS2LIP(byte[] input, int inOff)
    Convert a byte array of length 8 beginning at inOff into a long integer.
    static byte[]
    toByteArray(int[] input, int outLen)
    Convert an int array to a byte array of the specified length.
    static int[]
    toIntArray(byte[] input)
    Convert a byte array to an int array.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • OS2IP

      public static int OS2IP(byte[] input)
      Convert an octet string of length 4 to an integer. No length checking is performed.
      Parameters:
      input - the byte array holding the octet string
      Returns:
      an integer representing the octet string input
      Throws:
      ArithmeticException - if the length of the given octet string is larger than 4.

    • OS2IP

      public static int OS2IP(byte[] input, int inOff)
      Convert an byte array of length 4 beginning at offset into an integer.
      Parameters:
      input - the byte array
      inOff - the offset into the byte array
      Returns:
      the resulting integer

    • OS2IP

      public static int OS2IP(byte[] input, int inOff, int inLen)
      Convert a byte array of the given length beginning at offset into an integer.
      Parameters:
      input - the byte array
      inOff - the offset into the byte array
      inLen - the length of the encoding
      Returns:
      the resulting integer

    • OS2LIP

      public static long OS2LIP(byte[] input, int inOff)
      Convert a byte array of length 8 beginning at inOff into a long integer.
      Parameters:
      input - the byte array
      inOff - the offset into the byte array
      Returns:
      the resulting long integer

    • I2OSP

      public static byte[] I2OSP(int x)
      Convert an integer to an octet string of length 4.
      Parameters:
      x - the integer to convert
      Returns:
      the converted integer

    • I2OSP

      public static void I2OSP(int value, byte[] output, int outOff)
      Convert an integer into a byte array beginning at the specified offset.
      Parameters:
      value - the integer to convert
      output - the byte array to hold the result
      outOff - the integer offset into the byte array

    • I2OSP

      public static void I2OSP(int value, byte[] output, int outOff, int outLen)
      Convert an integer to a byte array beginning at the specified offset. No length checking is performed (i.e., if the integer cannot be encoded with length octets, it is truncated).
      Parameters:
      value - the integer to convert
      output - the byte array to hold the result
      outOff - the integer offset into the byte array
      outLen - the length of the encoding

    • I2OSP

      public static byte[] I2OSP(long input)
      Convert an integer to a byte array of length 8.
      Parameters:
      input - the integer to convert
      Returns:
      the converted integer

    • I2OSP

      public static void I2OSP(long input, byte[] output, int outOff)
      Convert an integer to a byte array of length 8.
      Parameters:
      input - the integer to convert
      output - byte array holding the output
      outOff - offset in output array where the result is stored

    • toByteArray

      public static byte[] toByteArray(int[] input, int outLen)
      Convert an int array to a byte array of the specified length. No length checking is performed (i.e., if the last integer cannot be encoded with length % 4 octets, it is truncated).
      Parameters:
      input - the int array
      outLen - the length of the converted array
      Returns:
      the converted array

    • toIntArray

      public static int[] toIntArray(byte[] input)
      Convert a byte array to an int array.
      Parameters:
      input - the byte array
      Returns:
      the converted array