Mercurial > dropbear
annotate libtommath/bn_mp_reduce_setup.c @ 1630:9579377b5f8b
use strlcpy & strlcat (#74)
* refactor checkpubkeyperms() with safe BSD functions
fix gcc8 warnings
```
svr-authpubkey.c: In function 'checkpubkeyperms':
svr-authpubkey.c:427:2: warning: 'strncat' specified bound 5 equals source length [-Wstringop-overflow=]
strncat(filename, "/.ssh", 5); /* strlen("/.ssh") == 5 */
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
svr-authpubkey.c:433:2: warning: 'strncat' specified bound 16 equals source length [-Wstringop-overflow=]
strncat(filename, "/authorized_keys", 16);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
see https://www.sudo.ws/todd/papers/strlcpy.html
* restore strlcpy in xstrdup
see original https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/xmalloc.c?rev=1.16
| author | François Perrad <francois.perrad@gadz.org> |
|---|---|
| date | Wed, 20 Mar 2019 15:09:19 +0100 |
| parents | 8bba51a55704 |
| children | f52919ffd3b1 |
| rev | line source |
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| 1436 | 1 #include <tommath_private.h> |
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2 #ifdef BN_MP_REDUCE_SETUP_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
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4 * |
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5 * LibTomMath is a library that provides multiple-precision |
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6 * integer arithmetic as well as number theoretic functionality. |
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7 * |
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8 * The library was designed directly after the MPI library by |
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9 * Michael Fromberger but has been written from scratch with |
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10 * additional optimizations in place. |
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11 * |
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12 * The library is free for all purposes without any express |
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13 * guarantee it works. |
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14 * |
| 1436 | 15 * Tom St Denis, [email protected], http://libtom.org |
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16 */ |
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17 |
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18 /* pre-calculate the value required for Barrett reduction |
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19 * For a given modulus "b" it calulates the value required in "a" |
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20 */ |
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21 int mp_reduce_setup (mp_int * a, mp_int * b) |
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22 { |
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23 int res; |
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24 |
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25 if ((res = mp_2expt (a, b->used * 2 * DIGIT_BIT)) != MP_OKAY) { |
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26 return res; |
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27 } |
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28 return mp_div (a, b, a, NULL); |
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29 } |
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30 #endif |
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31 |
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32 /* ref: $Format:%D$ */ |
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33 /* git commit: $Format:%H$ */ |
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34 /* commit time: $Format:%ai$ */ |