Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_make_key.c @ 1772:0cc85b4a4abb

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Move fuzzer-kex initialisation into a constructor function Hopefully this can avoid hitting AFL timeouts https://github.com/google/oss-fuzz/pull/2474
author Matt Johnston <matt@ucc.asn.au>
date Thu, 29 Oct 2020 23:00:52 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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diff changeset
4 * algorithms in a highly modular and flexible manner.
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diff changeset
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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diff changeset
9 #include "tomcrypt.h"
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10
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diff changeset
11 /**
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diff changeset
12 @file katja_make_key.c
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diff changeset
13 Katja key generation, Tom St Denis
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
14 */
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15
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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16 #ifdef LTC_MKAT
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17
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
18 /**
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diff changeset
19 Create a Katja key
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20 @param prng An active PRNG state
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21 @param wprng The index of the PRNG desired
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22 @param size The size of the modulus (key size) desired (octets)
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23 @param key [out] Destination of a newly created private key pair
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24 @return CRYPT_OK if successful, upon error all allocated ram is freed
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25 */
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diff changeset
26 int katja_make_key(prng_state *prng, int wprng, int size, katja_key *key)
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27 {
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diff changeset
28 void *p, *q, *tmp1, *tmp2;
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diff changeset
29 int err;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
30
382
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diff changeset
31 LTC_ARGCHK(key != NULL);
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32 LTC_ARGCHK(ltc_mp.name != NULL);
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33
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34 if ((size < (MIN_KAT_SIZE/8)) || (size > (MAX_KAT_SIZE/8))) {
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35 return CRYPT_INVALID_KEYSIZE;
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36 }
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37
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
38 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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39 return err;
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40 }
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41
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diff changeset
42 if ((err = mp_init_multi(&p, &q, &tmp1, &tmp2, NULL)) != CRYPT_OK) {
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43 return err;
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44 }
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45
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diff changeset
46 /* divide size by three */
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47 size = (((size << 3) / 3) + 7) >> 3;
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48
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49 /* make prime "q" (we negate size to make q == 3 mod 4) */
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50 if ((err = rand_prime(q, -size, prng, wprng)) != CRYPT_OK) { goto done; }
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diff changeset
51 if ((err = mp_sub_d(q, 1, tmp1)) != CRYPT_OK) { goto done; }
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52
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diff changeset
53 /* make prime "p" */
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diff changeset
54 do {
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diff changeset
55 if ((err = rand_prime(p, size+1, prng, wprng)) != CRYPT_OK) { goto done; }
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diff changeset
56 if ((err = mp_gcd(p, tmp1, tmp2)) != CRYPT_OK) { goto done; }
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diff changeset
57 } while (mp_cmp_d(tmp2, 1) != LTC_MP_EQ);
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58
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diff changeset
59 /* make key */
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diff changeset
60 if ((err = mp_init_multi(&key->d, &key->N, &key->dQ, &key->dP,
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parents:
diff changeset
61 &key->qP, &key->p, &key->q, &key->pq, NULL)) != CRYPT_OK) {
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62 goto error;
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diff changeset
63 }
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diff changeset
64
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parents:
diff changeset
65 /* n=p^2q and 1/n mod pq */
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parents:
diff changeset
66 if ((err = mp_copy( p, key->p)) != CRYPT_OK) { goto error2; }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67 if ((err = mp_copy( q, key->q)) != CRYPT_OK) { goto error2; }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
68 if ((err = mp_mul(key->p, key->q, key->pq)) != CRYPT_OK) { goto error2; } /* tmp1 = pq */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
69 if ((err = mp_mul(key->pq, key->p, key->N)) != CRYPT_OK) { goto error2; } /* N = p^2q */
382
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
70 if ((err = mp_sub_d( p, 1, tmp1)) != CRYPT_OK) { goto error2; } /* tmp1 = q-1 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71 if ((err = mp_sub_d( q, 1, tmp2)) != CRYPT_OK) { goto error2; } /* tmp2 = p-1 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72 if ((err = mp_lcm(tmp1, tmp2, key->d)) != CRYPT_OK) { goto error2; } /* tmp1 = lcd(p-1,q-1) */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
73 if ((err = mp_invmod( key->N, key->d, key->d)) != CRYPT_OK) { goto error2; } /* key->d = 1/N mod pq */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 /* optimize for CRT now */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 /* find d mod q-1 and d mod p-1 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 if ((err = mp_mod( key->d, tmp1, key->dP)) != CRYPT_OK) { goto error2; } /* dP = d mod p-1 */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 if ((err = mp_mod( key->d, tmp2, key->dQ)) != CRYPT_OK) { goto error2; } /* dQ = d mod q-1 */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 if ((err = mp_invmod( q, p, key->qP)) != CRYPT_OK) { goto error2; } /* qP = 1/q mod p */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 /* set key type (in this case it's CRT optimized) */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 key->type = PK_PRIVATE;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 /* return ok and free temps */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 err = CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 goto done;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 error2:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 mp_clear_multi( key->d, key->N, key->dQ, key->dP, key->qP, key->p, key->q, key->pq, NULL);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 error:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 done:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 mp_clear_multi( tmp2, tmp1, p, q, NULL);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
97 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
98 /* 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
99 /* commit time: $Format:%ai$ */