org.whispersystems.curve25519.java.fe_sub Maven / Gradle / Ivy

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Curve25519 library for Java

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package org.whispersystems.curve25519.java;

public class fe_sub {

//CONVERT #include "fe.h"

/*
h = f - g
Can overlap h with f or g.

Preconditions:
   |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
   |g| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.

Postconditions:
   |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
*/

    public static void fe_sub(int[] h, int[] f, int[] g) {
        int f0 = f[0];
        int f1 = f[1];
        int f2 = f[2];
        int f3 = f[3];
        int f4 = f[4];
        int f5 = f[5];
        int f6 = f[6];
        int f7 = f[7];
        int f8 = f[8];
        int f9 = f[9];
        int g0 = g[0];
        int g1 = g[1];
        int g2 = g[2];
        int g3 = g[3];
        int g4 = g[4];
        int g5 = g[5];
        int g6 = g[6];
        int g7 = g[7];
        int g8 = g[8];
        int g9 = g[9];
        int h0 = f0 - g0;
        int h1 = f1 - g1;
        int h2 = f2 - g2;
        int h3 = f3 - g3;
        int h4 = f4 - g4;
        int h5 = f5 - g5;
        int h6 = f6 - g6;
        int h7 = f7 - g7;
        int h8 = f8 - g8;
        int h9 = f9 - g9;
        h[0] = h0;
        h[1] = h1;
        h[2] = h2;
        h[3] = h3;
        h[4] = h4;
        h[5] = h5;
        h[6] = h6;
        h[7] = h7;
        h[8] = h8;
        h[9] = h9;
    }


}