Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ltc_ecc_map.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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diff changeset
2 *
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diff changeset
3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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diff changeset
7 * guarantee it works.
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diff changeset
8 */
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9
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diff changeset
10 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
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11 *
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12 * All curves taken from NIST recommendation paper of July 1999
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13 * Available at http://csrc.nist.gov/cryptval/dss.htm
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14 */
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15 #include "tomcrypt.h"
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16
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17 /**
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18 @file ltc_ecc_map.c
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19 ECC Crypto, Tom St Denis
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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20 */
382
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21
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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22 #ifdef LTC_MECC
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23
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24 /**
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25 Map a projective jacbobian point back to affine space
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26 @param P [in/out] The point to map
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27 @param modulus The modulus of the field the ECC curve is in
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28 @param mp The "b" value from montgomery_setup()
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29 @return CRYPT_OK on success
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30 */
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diff changeset
31 int ltc_ecc_map(ecc_point *P, void *modulus, void *mp)
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32 {
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33 void *t1, *t2;
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34 int err;
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35
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36 LTC_ARGCHK(P != NULL);
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37 LTC_ARGCHK(modulus != NULL);
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38 LTC_ARGCHK(mp != NULL);
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39
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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40 if ((err = mp_init_multi(&t1, &t2, NULL)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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41 return err;
382
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42 }
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43
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44 /* first map z back to normal */
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45 if ((err = mp_montgomery_reduce(P->z, modulus, mp)) != CRYPT_OK) { goto done; }
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46
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diff changeset
47 /* get 1/z */
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48 if ((err = mp_invmod(P->z, modulus, t1)) != CRYPT_OK) { goto done; }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
49
382
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50 /* get 1/z^2 and 1/z^3 */
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51 if ((err = mp_sqr(t1, t2)) != CRYPT_OK) { goto done; }
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52 if ((err = mp_mod(t2, modulus, t2)) != CRYPT_OK) { goto done; }
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53 if ((err = mp_mul(t1, t2, t1)) != CRYPT_OK) { goto done; }
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diff changeset
54 if ((err = mp_mod(t1, modulus, t1)) != CRYPT_OK) { goto done; }
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55
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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56 /* multiply against x/y */
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57 if ((err = mp_mul(P->x, t2, P->x)) != CRYPT_OK) { goto done; }
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58 if ((err = mp_montgomery_reduce(P->x, modulus, mp)) != CRYPT_OK) { goto done; }
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diff changeset
59 if ((err = mp_mul(P->y, t1, P->y)) != CRYPT_OK) { goto done; }
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60 if ((err = mp_montgomery_reduce(P->y, modulus, mp)) != CRYPT_OK) { goto done; }
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diff changeset
61 if ((err = mp_set(P->z, 1)) != CRYPT_OK) { goto done; }
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62
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diff changeset
63 err = CRYPT_OK;
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64 done:
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diff changeset
65 mp_clear_multi(t1, t2, NULL);
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diff changeset
66 return err;
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67 }
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68
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff changeset
69 #endif
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70
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
71 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
72 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
73 /* commit time: $Format:%ai$ */
382
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parents:
diff changeset
74