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Dmitry Baryshkov
nettle
Commits
ec613387
Commit
ec613387
authored
Oct 14, 2014
by
Niels Möller
Browse files
Implemented _eddsa_verify. Almost correct.
parent
259f0d2b
Changes
4
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ChangeLog
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ec613387
2014-10-14 Niels Möller <nisse@lysator.liu.se>
* eddsa-verify.c (_eddsa_verify, eddsa_verify_itch): New file, new
functions.
* eddsa.h: Declare new functions.
* Makefile.in (hogweed_SOURCES): Added eddsa-verify.c.
2014-10-08 Niels Möller <nisse@lysator.liu.se>
* testsuite/eddsa-sign-test.c (test_eddsa_sign): Use
...
...
Makefile.in
View file @
ec613387
...
...
@@ -177,7 +177,7 @@ hogweed_SOURCES = sexp.c sexp-format.c \
ecc-ecdsa-verify.c ecdsa-verify.c ecdsa-keygen.c
\
curve25519-mul-g.c curve25519-mul.c curve25519-eh-to-x.c
\
eddsa-compress.c eddsa-decompress.c eddsa-expand.c
\
eddsa-hash.c eddsa-sign.c
\
eddsa-hash.c eddsa-sign.c
eddsa-verify.c
\
$(OPT_HOGWEED_SOURCES)
HEADERS
=
aes.h arcfour.h arctwo.h asn1.h blowfish.h
\
...
...
eddsa-verify.c
0 → 100644
View file @
ec613387
/* eddsa-verify.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.
or
* 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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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 http://www.gnu.org/licenses/.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include
<assert.h>
#include
"eddsa.h"
#include
"ecc.h"
#include
"ecc-internal.h"
#include
"nettle-meta.h"
/* FIXME: Use mpn_zero_p. Also duplicated in ecc-ecdsa-verify.c. */
static
int
zero_p
(
const
mp_limb_t
*
xp
,
mp_size_t
n
)
{
while
(
n
>
0
)
if
(
xp
[
--
n
]
>
0
)
return
0
;
return
1
;
}
mp_size_t
_eddsa_verify_itch
(
const
struct
ecc_curve
*
ecc
)
{
return
8
*
ecc
->
p
.
size
+
ecc
->
mul_itch
;
}
int
_eddsa_verify
(
const
struct
ecc_curve
*
ecc
,
const
struct
nettle_hash
*
H
,
const
uint8_t
*
pub
,
void
*
ctx
,
const
mp_limb_t
*
A
,
size_t
length
,
const
uint8_t
*
msg
,
const
uint8_t
*
signature
,
mp_limb_t
*
scratch
)
{
size_t
nbytes
;
#define R scratch
#define sp (scratch + 2*ecc->p.size)
#define hp (scratch + 3*ecc->p.size)
#define P (scratch + 5*ecc->p.size)
#define scratch_out (scratch + 8*ecc->p.size)
#define S R
#define hash ((uint8_t *) P)
nbytes
=
1
+
ecc
->
p
.
bit_size
/
8
;
/* Could maybe save some storage by delaying the R and S operations,
but it makes sense to check them for validity up front. */
if
(
!
_eddsa_decompress
(
ecc
,
R
,
signature
,
R
+
2
*
ecc
->
p
.
size
))
return
0
;
mpn_set_base256_le
(
sp
,
ecc
->
q
.
size
,
signature
+
nbytes
,
nbytes
);
/* Check that s < q */
if
(
mpn_cmp
(
sp
,
ecc
->
q
.
m
,
ecc
->
q
.
size
)
>=
0
)
return
0
;
H
->
init
(
ctx
);
H
->
update
(
ctx
,
nbytes
,
signature
);
H
->
update
(
ctx
,
nbytes
,
pub
);
H
->
update
(
ctx
,
length
,
msg
);
H
->
digest
(
ctx
,
2
*
nbytes
,
hash
);
_eddsa_hash
(
&
ecc
->
q
,
hp
,
hash
);
/* Compute h A + R - s G, which should be the neutral point */
ecc
->
mul
(
ecc
,
P
,
hp
,
A
,
scratch_out
);
/* FIXME: Introduce an ecc->add method? */
ecc_add_eh
(
ecc
,
P
,
P
,
R
,
scratch_out
);
/* Produces s in the range 1 <= s <= q, with no carry. */
mpn_sub_n
(
hp
,
ecc
->
q
.
m
,
sp
,
ecc
->
q
.
size
);
ecc
->
mul_g
(
ecc
,
S
,
hp
,
scratch_out
);
ecc_add_ehh
(
ecc
,
P
,
P
,
S
,
scratch_out
);
/* Zero point iff x == 0 (mod p) iff (x == 0 or x == p) */
/* FIXME: Needs to differentiate between (0,1) and (0,-1). Implement
point compare instead of the above ecc_add_ehh?
/* FIXME: Introduce zero_p method? */
return
(
zero_p
(
P
,
ecc
->
p
.
size
)
||
mpn_cmp
(
P
,
ecc
->
p
.
m
,
ecc
->
p
.
size
)
==
0
);
#undef R
#undef sp
#undef hp
#undef P
#undef S
}
eddsa.h
View file @
ec613387
...
...
@@ -50,6 +50,8 @@ extern "C" {
#define _eddsa_expand_key _nettle_eddsa_expand_key
#define _eddsa_sign _nettle_eddsa_sign
#define _eddsa_sign_itch _nettle_eddsa_sign_itch
#define _eddsa_verify _nettle_eddsa_verify
#define _eddsa_verify_itch _nettle_eddsa_verify_itch
#define ED25519_KEY_SIZE 32
...
...
@@ -87,6 +89,20 @@ _eddsa_sign (const struct ecc_curve *ecc,
uint8_t
*
signature
,
mp_limb_t
*
scratch
);
mp_size_t
_eddsa_verify_itch
(
const
struct
ecc_curve
*
ecc
);
int
_eddsa_verify
(
const
struct
ecc_curve
*
ecc
,
const
struct
nettle_hash
*
H
,
const
uint8_t
*
pub
,
void
*
ctx
,
const
mp_limb_t
*
A
,
size_t
length
,
const
uint8_t
*
msg
,
const
uint8_t
*
signature
,
mp_limb_t
*
scratch
);
mp_size_t
_eddsa_expand_key_itch
(
const
struct
ecc_curve
*
ecc
);
...
...
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