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Dmitry Baryshkov
nettle
Commits
6907bbac
Commit
6907bbac
authored
Oct 02, 2014
by
Niels Möller
Browse files
Implemented eddsa compression and decompression.
parent
993bfa0c
Changes
5
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ChangeLog
View file @
6907bbac
20141002 Niels Möller <nisse@lysator.liu.se>
* eddsadecompress.c (_eddsa_decompress): New file, new function.
* eddsacompress.c (_eddsa_compress): New file, new function.
* eddsa.h: New file.
* Makefile.in (HEADERS): Added eddsa.h.
(hogweed_SOURCES): Added eddsacompress.c and eddsadecompress.c.
* testsuite/eccsqrttest.c: New test case.
* testsuite/Makefile.in (TS_HOGWEED_SOURCES): Added
eccsqrttest.c.
...
...
Makefile.in
View file @
6907bbac
...
...
@@ 176,13 +176,14 @@ hogweed_SOURCES = sexp.c sexpformat.c \
eccecdsasign.c ecdsasign.c
\
eccecdsaverify.c ecdsaverify.c ecdsakeygen.c
\
curve25519mulg.c curve25519mul.c curve25519ehtox.c
\
eddsacompress.c eddsadecompress.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 chachapoly1305.h ctr.h
\
curve25519.h des.h descompat.h dsa.h dsacompat.h eax.h
\
ecccurve.h ecc.h ecdsa.h
\
ecccurve.h ecc.h ecdsa.h
eddsa.h
\
gcm.h gosthash94.h hmac.h
\
knuthlfib.h
\
macros.h
\
...
...
eddsacompress.c
0 → 100644
View file @
6907bbac
/* eddsacompress.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
"eddsa.h"
#include
"eccinternal.h"
#include
"gmpglue.h"
mp_size_t
_eddsa_compress_itch
(
const
struct
ecc_curve
*
ecc
)
{
return
2
*
ecc
>
p
.
size
+
ecc
>
h_to_a_itch
;
}
void
_eddsa_compress
(
const
struct
ecc_curve
*
ecc
,
uint8_t
*
r
,
mp_limb_t
*
p
,
mp_limb_t
*
scratch
)
{
#define xp scratch
#define yp (scratch + ecc>p.size)
#define scratch_out (scratch + 2*ecc>p.size)
ecc
>
h_to_a
(
ecc
,
0
,
xp
,
p
,
scratch_out
);
/* Encoding is the y coordinate and an appended "sign" bit, which is
the low bit of x. Bit order is not specified explicitly, but for
littleendian encoding, it makes most sense to append the bit
after the most significant bit of y. */
mpn_get_base256_le
(
r
,
1
+
ecc
>
p
.
bit_size
/
8
,
yp
,
ecc
>
p
.
size
);
r
[
ecc
>
p
.
bit_size
/
8
]
+=
(
xp
[
0
]
&
1
)
<<
(
ecc
>
p
.
bit_size
&
7
);
}
eddsadecompress.c
0 → 100644
View file @
6907bbac
/* eddsadecompress.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
"eddsa.h"
#include
"eccinternal.h"
#include
"gmpglue.h"
mp_size_t
_eddsa_decompress_itch
(
const
struct
ecc_curve
*
ecc
)
{
return
4
*
ecc
>
p
.
size
+
ecc
>
p
.
sqrt_itch
;
}
int
_eddsa_decompress
(
const
struct
ecc_curve
*
ecc
,
mp_limb_t
*
p
,
const
uint8_t
*
cp
,
mp_limb_t
*
scratch
)
{
mp_limb_t
sign
,
cy
;
int
res
;
#define xp p
#define yp (p + ecc>p.size)
#define y2 scratch
#define vp (scratch + ecc>p.size)
#define up scratch
#define tp (scratch + 2*ecc>p.size)
#define scratch_out (scratch + 4*ecc>p.size)
sign
=
cp
[
ecc
>
p
.
bit_size
/
8
]
>>
(
ecc
>
p
.
bit_size
&
7
);
if
(
sign
>
1
)
return
0
;
mpn_set_base256_le
(
yp
,
ecc
>
p
.
size
,
cp
,
1
+
ecc
>
p
.
bit_size
/
8
);
/* Clear out the sign bit (if it fits) */
yp
[
ecc
>
p
.
size

1
]
&=
~
(
mp_limb_t
)
0
>>
(
ecc
>
p
.
size
*
GMP_NUMB_BITS

ecc
>
p
.
bit_size
);
ecc_modp_sqr
(
ecc
,
y2
,
yp
);
ecc_modp_mul
(
ecc
,
vp
,
y2
,
ecc
>
b
);
ecc_modp_sub
(
ecc
,
vp
,
vp
,
ecc
>
unit
);
ecc_modp_sub
(
ecc
,
up
,
ecc
>
unit
,
y2
);
res
=
ecc
>
p
.
sqrt
(
&
ecc
>
p
,
tp
,
up
,
vp
,
scratch_out
);
cy
=
mpn_sub_n
(
xp
,
tp
,
ecc
>
p
.
m
,
ecc
>
p
.
size
);
cnd_copy
(
cy
,
xp
,
tp
,
ecc
>
p
.
size
);
sign
^=
xp
[
0
]
&
1
;
mpn_sub_n
(
tp
,
ecc
>
p
.
m
,
xp
,
ecc
>
p
.
size
);
cnd_copy
(
sign
,
xp
,
tp
,
ecc
>
p
.
size
);
return
res
;
}
eddsa.h
0 → 100644
View file @
6907bbac
/* eddsa.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_EDDSA_H
#define NETTLE_EDDSA_H
#include
"nettletypes.h"
#include
"bignum.h"
#ifdef __cplusplus
extern
"C"
{
#endif
/* Name mangling */
#define _eddsa_compress _nettle_eddsa_compress
#define _eddsa_compress_itch _nettle_eddsa_compress_itch
#define _eddsa_decompress _nettle_eddsa_decompress
#define _eddsa_decompress_itch _nettle_eddsa_decompress_itch
#define ED25519_KEY_SIZE 32
struct
ecc_curve
;
mp_size_t
_eddsa_compress_itch
(
const
struct
ecc_curve
*
ecc
);
void
_eddsa_compress
(
const
struct
ecc_curve
*
ecc
,
uint8_t
*
r
,
mp_limb_t
*
p
,
mp_limb_t
*
scratch
);
mp_size_t
_eddsa_decompress_itch
(
const
struct
ecc_curve
*
ecc
);
int
_eddsa_decompress
(
const
struct
ecc_curve
*
ecc
,
mp_limb_t
*
p
,
const
uint8_t
*
cp
,
mp_limb_t
*
scratch
);
#ifdef __cplusplus
}
#endif
#endif
/* NETTLE_EDDSA_H */
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