Package org.bouncycastle.asn1.x9

Class X9IntegerConverter

  • public class X9IntegerConverter
extends java.lang.Object
    A class which converts integers to byte arrays, allowing padding and calculations to be done according the the filed size of the curve or field element involved.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int getByteLength​(ECCurve c)
      Return the curve's field size in bytes.
      int getByteLength​(ECFieldElement fe)
      Return the field element's field size in bytes.
      byte[] integerToBytes​(java.math.BigInteger s, int qLength)
      Convert an integer to a byte array, ensuring it is exactly qLength long.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • X9IntegerConverter

        public X9IntegerConverter()

    • Method Detail

      • getByteLength

        public int getByteLength​(ECCurve c)
        Return the curve's field size in bytes.
        Parameters:
        c - the curve of interest.
        Returns:
        the field size in bytes (rounded up).

      • getByteLength

        public int getByteLength​(ECFieldElement fe)
        Return the field element's field size in bytes.
        Parameters:
        fe - the field element of interest.
        Returns:
        the field size in bytes (rounded up).

      • integerToBytes

        public byte[] integerToBytes​(java.math.BigInteger s,
                             int qLength)
        Convert an integer to a byte array, ensuring it is exactly qLength long.
        Parameters:
        s - the integer to be converted.
        qLength - the length
        Returns:
        the resulting byte array.