Commit 472444cf authored by Niels Möller's avatar Niels Möller
Browse files

New curve25519 test case.

parent 72ce18a9
2014-07-23 Niels Möller <>
* testsuite/curve25519-dh-test.c: New test case, based on
draft-josefsson-tls-curve25519-05 test vectors.
* testsuite/ (TS_HOGWEED_SOURCES): Added curve25519-dh-test.c.
2014-07-18 Niels Möller <>
* ecc-mul-g-eh.c (ecc_mul_g_eh, ecc_mul_g_eh_itch): New file and
......@@ -193,6 +193,9 @@ curve25519-dup-test$(EXEEXT): curve25519-dup-test.$(OBJEXT)
curve25519-add-test$(EXEEXT): curve25519-add-test.$(OBJEXT)
$(LINK) curve25519-add-test.$(OBJEXT) $(TEST_OBJS) -o curve25519-add-test$(EXEEXT)
curve25519-dh-test$(EXEEXT): curve25519-dh-test.$(OBJEXT)
$(LINK) curve25519-dh-test.$(OBJEXT) $(TEST_OBJS) -o curve25519-dh-test$(EXEEXT)
ecc-mod-test$(EXEEXT): ecc-mod-test.$(OBJEXT)
$(LINK) ecc-mod-test.$(OBJEXT) $(TEST_OBJS) -o ecc-mod-test$(EXEEXT)
......@@ -39,6 +39,7 @@ TS_HOGWEED_SOURCES = sexp-test.c sexp-format-test.c \
rsa-test.c rsa-encrypt-test.c rsa-keygen-test.c \
dsa-test.c dsa-keygen-test.c \
curve25519-dup-test.c curve25519-add-test.c \
curve25519-dh-test.c \
ecc-mod-test.c ecc-modinv-test.c ecc-redc-test.c \
ecc-mul-g-test.c ecc-mul-a-test.c \
ecdsa-sign-test.c ecdsa-verify-test.c ecdsa-keygen-test.c
/* curve25519-dh-test.c
Copyright (C) 2014 Niels Möller
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see
#include "testutils.h"
/* Computes the x coordinate of s G, where g is a scalar, and G is the
base point on the curve. If x is non-NULL, it gives the X
coordinate of the point G, otherwise, G is the specified
generator. */
static void
curve_25519 (const struct ecc_curve *ecc,
mp_limb_t *r, const mp_limb_t *s, const mp_limb_t *x)
mp_limb_t *p;
mp_limb_t *scratch;
mp_size_t itch;
if (x)
die ("Not yet implemented.\n");
itch = ECC_MUL_G_EH_ITCH (ecc->size);
p = gmp_alloc_limbs (3*ecc->size);
scratch = gmp_alloc_limbs (itch);
ecc_mul_g_eh (ecc, p, s, scratch);
ecc_eh_to_a (ecc, 2, r, p, scratch);
/* FIXME: Convert to little-endian here? */
gmp_free_limbs (p, 3*ecc->size);
gmp_free_limbs (scratch, itch);
static void
test_g (const char *sz, const char *pz)
mpz_t S, R, X;
const struct ecc_curve *ecc = &nettle_curve25519;
mpz_init (S);
mpz_init (R);
mpz_init (X);
mpz_set_str (S, sz, 16);
mpz_set_str (R, pz, 16);
ASSERT (mpz_size (S) == ecc->size);
curve_25519 (ecc, mpz_limbs_write (X, ecc->size),
mpz_limbs_read (S), NULL);
mpz_limbs_finish (X, ecc->size);
if (mpz_cmp (X, R) != 0)
fprintf (stderr, "curve25519 failure:\ns = ");
mpz_out_str (stderr, 16, S);
fprintf (stderr, "\nX = ");
mpz_out_str (stderr, 16, X);
fprintf (stderr, " (bad)\nR = ");
mpz_out_str (stderr, 16, R);
fprintf (stderr, " (expected)\n");
abort ();
mpz_clear (S);
mpz_clear (R);
mpz_clear (X);
test_main (void)
/* From draft-josefsson-tls-curve25519-05. Different endianness for
the P values, though. */
test_g ("6A2CB91DA5FB77B12A99C0EB872F4CDF"
test_g ("6BE088FF278B2F1CFDB6182629B13B6F"
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