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Nettle
nettle
Commits
28b7678e
Commit
28b7678e
authored
Aug 06, 2014
by
Niels Möller
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New function curve25519_base.
parent
2ac6d737
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4
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1 deletion
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-1
ChangeLog
ChangeLog
+6
-0
Makefile.in
Makefile.in
+2
-1
curve25519-base.c
curve25519-base.c
+71
-0
curve25519.h
curve25519.h
+49
-0
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ChangeLog
View file @
28b7678e
2014-08-06 Niels Möller <nisse@lysator.liu.se>
* curve25519-base.c (curve25519_base): New file, new function.
Analogous to NaCl's crypto_scalarmult_base.
* curve25519.h: New file.
* Makefile.in (hogweed_SOURCES): Added curve25519-base.c.
(HEADERS): Added curve25519.h.
* gmp-glue.c (mpn_set_base256_le, mpn_get_base256_le): New functions.
* gmp-glue.h: Declare them.
...
...
Makefile.in
View file @
28b7678e
...
...
@@ -174,12 +174,13 @@ hogweed_SOURCES = sexp.c sexp-format.c \
ecc-point.c ecc-scalar.c ecc-point-mul.c ecc-point-mul-g.c
\
ecc-ecdsa-sign.c ecdsa-sign.c
\
ecc-ecdsa-verify.c ecdsa-verify.c ecdsa-keygen.c
\
curve25519-base.c
\
$(OPT_HOGWEED_SOURCES)
HEADERS
=
aes.h arcfour.h arctwo.h asn1.h blowfish.h
\
base16.h base64.h buffer.h camellia.h cast128.h
\
cbc.h ccm.h chacha.h chacha-poly1305.h ctr.h
\
des.h des-compat.h dsa.h dsa-compat.h eax.h
\
curve25519.h
des.h des-compat.h dsa.h dsa-compat.h eax.h
\
ecc-curve.h ecc.h ecdsa.h
\
gcm.h gosthash94.h hmac.h
\
knuth-lfib.h
\
...
...
curve25519-base.c
0 → 100644
View file @
28b7678e
/* curve25519-base.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 <string.h>
#include "curve25519.h"
#include "ecc.h"
#include "ecc-internal.h"
/* Intended to be compatible with NaCl's crypto_scalarmult_base. */
void
curve25519_base
(
uint8_t
*
r
,
const
uint8_t
*
n
)
{
uint8_t
t
[
CURVE25519_SIZE
];
mp_limb_t
*
scratch
;
mp_size_t
ecc_size
;
mp_size_t
itch
;
#define p scratch
#define x (scratch + 3*ecc_size)
#define scratch_out (scratch + 4*ecc_size)
memcpy
(
t
,
n
,
sizeof
(
t
));
t
[
0
]
&=
~
7
;
t
[
CURVE25519_SIZE
-
1
]
=
(
t
[
CURVE25519_SIZE
-
1
]
&
0x3f
)
|
0x40
;
ecc_size
=
nettle_curve25519
.
size
;
itch
=
4
*
ecc_size
+
ECC_MUL_G_EH_ITCH
(
ecc_size
);
scratch
=
gmp_alloc_limbs
(
itch
);
mpn_set_base256_le
(
x
,
ecc_size
,
t
,
CURVE25519_SIZE
);
ecc_mul_g_eh
(
&
nettle_curve25519
,
p
,
x
,
scratch_out
);
ecc_eh_to_a
(
&
nettle_curve25519
,
2
,
x
,
p
,
scratch_out
);
mpn_get_base256_le
(
r
,
CURVE25519_SIZE
,
x
,
ecc_size
);
gmp_free_limbs
(
scratch
,
itch
);
}
curve25519.h
0 → 100644
View file @
28b7678e
/* curve25519.h
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/.
*/
#ifndef NETTLE_CURVE25519_H
#define NETTLE_CURVE25519_H
#include "nettle-types.h"
#ifdef __cplusplus
extern
"C"
{
#endif
/* Name mangling */
#define curve25519_base nettle_curve25519_base
#define CURVE25519_SIZE 32
void
curve25519_base
(
uint8_t
*
q
,
const
uint8_t
*
n
);
#endif
/* NETTLE_CURVE25519_H */
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