package im.actor.keygen.curve25519;
// Disabling Bounds checks for speeding up calculations
/*-[
#define J2OBJC_DISABLE_ARRAY_BOUND_CHECKS 1
]-*/
public class fe_frombytes {
//CONVERT #include "fe.h"
//CONVERT #include "long.h"
//CONVERT #include "long.h"
public static long load_3(byte[] in, int index) {
long result;
result = ((long) in[index + 0]) & 0xFF;
result |= (((long) in[index + 1]) << 8) & 0xFF00;
result |= (((long) in[index + 2]) << 16) & 0xFF0000;
return result;
}
public static long load_4(byte[] in, int index) {
long result;
result = (((long) in[index + 0]) & 0xFF);
result |= ((((long) in[index + 1]) << 8) & 0xFF00);
result |= ((((long) in[index + 2]) << 16) & 0xFF0000);
result |= ((((long) in[index + 3]) << 24) & 0xFF000000L);
return result;
}
/*
Ignores top bit of h.
*/
public static void fe_frombytes(int[] h, byte[] s) {
long h0 = load_4(s, 0);
long h1 = load_3(s, 4) << 6;
long h2 = load_3(s, 7) << 5;
long h3 = load_3(s, 10) << 3;
long h4 = load_3(s, 13) << 2;
long h5 = load_4(s, 16);
long h6 = load_3(s, 20) << 7;
long h7 = load_3(s, 23) << 5;
long h8 = load_3(s, 26) << 4;
long h9 = (load_3(s, 29) & 8388607) << 2;
long carry0;
long carry1;
long carry2;
long carry3;
long carry4;
long carry5;
long carry6;
long carry7;
long carry8;
long carry9;
carry9 = (h9 + (long) (1 << 24)) >> 25;
h0 += carry9 * 19;
h9 -= carry9 << 25;
carry1 = (h1 + (long) (1 << 24)) >> 25;
h2 += carry1;
h1 -= carry1 << 25;
carry3 = (h3 + (long) (1 << 24)) >> 25;
h4 += carry3;
h3 -= carry3 << 25;
carry5 = (h5 + (long) (1 << 24)) >> 25;
h6 += carry5;
h5 -= carry5 << 25;
carry7 = (h7 + (long) (1 << 24)) >> 25;
h8 += carry7;
h7 -= carry7 << 25;
carry0 = (h0 + (long) (1 << 25)) >> 26;
h1 += carry0;
h0 -= carry0 << 26;
carry2 = (h2 + (long) (1 << 25)) >> 26;
h3 += carry2;
h2 -= carry2 << 26;
carry4 = (h4 + (long) (1 << 25)) >> 26;
h5 += carry4;
h4 -= carry4 << 26;
carry6 = (h6 + (long) (1 << 25)) >> 26;
h7 += carry6;
h6 -= carry6 << 26;
carry8 = (h8 + (long) (1 << 25)) >> 26;
h9 += carry8;
h8 -= carry8 << 26;
h[0] = (int) h0;
h[1] = (int) h1;
h[2] = (int) h2;
h[3] = (int) h3;
h[4] = (int) h4;
h[5] = (int) h5;
h[6] = (int) h6;
h[7] = (int) h7;
h[8] = (int) h8;
h[9] = (int) h9;
}
}