Package net.i2p.crypto.eddsa.math.bigint

Class BigIntegerScalarOps

java.lang.Object
net.i2p.crypto.eddsa.math.bigint.BigIntegerScalarOps
All Implemented Interfaces:
Serializable, ScalarOps
public class BigIntegerScalarOps
extends Object
implements ScalarOps
See Also:
Serialized Form

  • Constructor Details

  • Method Details

    • reduce

      public byte[] reduce​(byte[] s)
      Description copied from interface: ScalarOps
      Reduce the given scalar mod $l$.

      From the Ed25519 paper:
      Here we interpret $2b$-bit strings in little-endian form as integers in $\{0, 1,..., 2^{(2b)}-1\}$.

      Specified by:
      reduce in interface ScalarOps
      Parameters:
      s - the scalar to reduce
      Returns:
      $s \bmod l$

    • multiplyAndAdd

      public byte[] multiplyAndAdd​(byte[] a, byte[] b, byte[] c)
      Description copied from interface: ScalarOps
      $r = (a * b + c) \bmod l$
      Specified by:
      multiplyAndAdd in interface ScalarOps
      Parameters:
      a - a scalar
      b - a scalar
      c - a scalar
      Returns:
      $(a*b + c) \bmod l$