mdw@git.distorted.org.uk Git - secnet/blob - xdh-test.c

   1 /*
   2  * xdh-test.c: test harness for elliptic-curve Diffie--Hellman
   3  *
   4  * (The implementations originally came with different test arrangements,
   5  * with complicated external dependencies.  This file replicates the original
   6  * tests, but without the dependencies.)
   7  */
   8 /*
   9  * This file is Free Software.  It was originally written for secnet.
  10  *
  11  * Copyright 2017 Mark Wooding
  12  *
  13  * You may redistribute secnet as a whole and/or modify it under the
  14  * terms of the GNU General Public License as published by the Free
  15  * Software Foundation; either version 3, or (at your option) any
  16  * later version.
  17  *
  18  * You may redistribute this file and/or modify it under the terms of
  19  * the GNU General Public License as published by the Free Software
  20  * Foundation; either version 2, or (at your option) any later
  21  * version.
  22  *
  23  * This software is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this software; if not, see
  30  * https://www.gnu.org/licenses/gpl.html.
  31  */
  32
  33 #include <stdio.h>
  34
  35 #include "secnet.h"
  36
  37 #include "x25519.h"
  38 #include "x448.h"
  39
  40 #define x25519_KEYSZ X25519_KEYSZ
  41 #define x448_KEYSZ X448_KEYSZ
  42
  43 #define GLUE(x, y) GLUE_(x, y)
  44 #define GLUE_(x, y) x##y
  45 #define XDHOP(op) GLUE(XDH, _##op)
  46
  47 #define REG_MEMBERS                                                     \
  48     uint8_t k[XDHOP(KEYSZ)];
  49 #include "crypto-test.h"
  50
  51 enum {
  52     RZ, NROUT,
  53     RN = NROUT, RX, RY, NREG
  54 };
  55
  56 static void parse_key(union regval *v, char *p)
  57     { parse_hex(v->k, sizeof(v->k), p); }
  58
  59 static void dump_key(FILE *fp, const union regval *v)
  60     { dump_hex(fp, v->k, sizeof(v->k)); }
  61
  62 static int eq_key(const union regval *v0, const union regval *v1)
  63     { return (memcmp(v0->k, v1->k, sizeof(v0->k)) == 0); }
  64
  65 static const struct regty regty_key = {
  66     trivial_regty_init,
  67     parse_key,
  68     dump_key,
  69     eq_key,
  70     trivial_regty_release
  71 };
  72
  73 static void test_xdh(struct reg *out, const struct reg *in, void *ctx)
  74     { XDH(out[RZ].v.k, in[RX].v.k, in[RY].v.k); }
  75
  76 static void test_xdhmct(struct reg *out, const struct reg *in, void *ctx)
  77 {
  78     uint8_t b0[XDHOP(KEYSZ)], b1[XDHOP(KEYSZ)], *x = b0, *y = b1, *t;
  79     unsigned long i, n;
  80
  81     memcpy(b0, in[RX].v.k, sizeof(b0));
  82     memcpy(b1, in[RY].v.k, sizeof(b1));
  83     n = in[RN].v.u;
  84     for (i = 0; i < n; i++) {
  85         XDH(y, x, y);
  86         t = y; y = x; x = t;
  87     }
  88     memcpy(out[RZ].v.k, x, sizeof(b0));
  89 }
  90 #define REG_X { "x", RX, &regty_key, 0 }
  91 #define REG_Y { "Y", RY, &regty_key, 0 }
  92 #define REG_Z { "Z", RZ, &regty_key, 0 }
  93 #define REG_N { "n", RN, &regty_uint, 0 }
  94 static const struct regdef
  95     xdh_regs[] = { REG_X, REG_Y, REG_Z, REGLIST_END },
  96     xdhmct_regs[] = { REG_X, REG_Y, REG_N, REG_Z, REGLIST_END };
  97
  98 static const struct test tests[] = {
  99     { STRING(XDH), run_test, xdh_regs, test_xdh },
 100     { STRING(XDH) "-mct", run_test, xdhmct_regs, test_xdhmct },
 101     { 0 }
 102 };
 103
 104 int main(void)
 105     { return run_test_suite(NROUT, NREG, sizeof(struct reg), tests, stdin); }