Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_make_key.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +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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diff changeset
4 * algorithms in a highly modular and flexible manner.
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diff changeset
5 *
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diff changeset
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
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parents: 1435
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18 /**
382
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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
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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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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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diff changeset
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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diff changeset
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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57 } while (mp_cmp_d(tmp2, 1) != LTC_MP_EQ);
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58
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parents:
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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diff changeset
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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Matt Johnston <matt@ucc.asn.au>
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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 */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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: $Format:%ai$ */