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comparison libtomcrypt/src/pk/katja/katja_make_key.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
parents f849a5ca2efc
children
comparison
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1470:8bba51a55704 1471:6dba84798cd5
3 * LibTomCrypt is a library that provides various cryptographic 3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtom.org
10 */ 8 */
11 #include "tomcrypt.h" 9 #include "tomcrypt.h"
12 10
13 /** 11 /**
14 @file katja_make_key.c 12 @file katja_make_key.c
15 Katja key generation, Tom St Denis 13 Katja key generation, Tom St Denis
16 */ 14 */
17 15
18 #ifdef MKAT 16 #ifdef LTC_MKAT
19 17
20 /** 18 /**
21 Create a Katja key 19 Create a Katja key
22 @param prng An active PRNG state 20 @param prng An active PRNG state
23 @param wprng The index of the PRNG desired 21 @param wprng The index of the PRNG desired
24 @param size The size of the modulus (key size) desired (octets) 22 @param size The size of the modulus (key size) desired (octets)
25 @param key [out] Destination of a newly created private key pair 23 @param key [out] Destination of a newly created private key pair
27 */ 25 */
28 int katja_make_key(prng_state *prng, int wprng, int size, katja_key *key) 26 int katja_make_key(prng_state *prng, int wprng, int size, katja_key *key)
29 { 27 {
30 void *p, *q, *tmp1, *tmp2; 28 void *p, *q, *tmp1, *tmp2;
31 int err; 29 int err;
32 30
33 LTC_ARGCHK(key != NULL); 31 LTC_ARGCHK(key != NULL);
34 LTC_ARGCHK(ltc_mp.name != NULL); 32 LTC_ARGCHK(ltc_mp.name != NULL);
35 33
36 if ((size < (MIN_KAT_SIZE/8)) || (size > (MAX_KAT_SIZE/8))) { 34 if ((size < (MIN_KAT_SIZE/8)) || (size > (MAX_KAT_SIZE/8))) {
37 return CRYPT_INVALID_KEYSIZE; 35 return CRYPT_INVALID_KEYSIZE;
66 64
67 /* n=p^2q and 1/n mod pq */ 65 /* n=p^2q and 1/n mod pq */
68 if ((err = mp_copy( p, key->p)) != CRYPT_OK) { goto error2; } 66 if ((err = mp_copy( p, key->p)) != CRYPT_OK) { goto error2; }
69 if ((err = mp_copy( q, key->q)) != CRYPT_OK) { goto error2; } 67 if ((err = mp_copy( q, key->q)) != CRYPT_OK) { goto error2; }
70 if ((err = mp_mul(key->p, key->q, key->pq)) != CRYPT_OK) { goto error2; } /* tmp1 = pq */ 68 if ((err = mp_mul(key->p, key->q, key->pq)) != CRYPT_OK) { goto error2; } /* tmp1 = pq */
71 if ((err = mp_mul(key->pq, key->p, key->N)) != CRYPT_OK) { goto error2; } /* N = p^2q */ 69 if ((err = mp_mul(key->pq, key->p, key->N)) != CRYPT_OK) { goto error2; } /* N = p^2q */
72 if ((err = mp_sub_d( p, 1, tmp1)) != CRYPT_OK) { goto error2; } /* tmp1 = q-1 */ 70 if ((err = mp_sub_d( p, 1, tmp1)) != CRYPT_OK) { goto error2; } /* tmp1 = q-1 */
73 if ((err = mp_sub_d( q, 1, tmp2)) != CRYPT_OK) { goto error2; } /* tmp2 = p-1 */ 71 if ((err = mp_sub_d( q, 1, tmp2)) != CRYPT_OK) { goto error2; } /* tmp2 = p-1 */
74 if ((err = mp_lcm(tmp1, tmp2, key->d)) != CRYPT_OK) { goto error2; } /* tmp1 = lcd(p-1,q-1) */ 72 if ((err = mp_lcm(tmp1, tmp2, key->d)) != CRYPT_OK) { goto error2; } /* tmp1 = lcd(p-1,q-1) */
75 if ((err = mp_invmod( key->N, key->d, key->d)) != CRYPT_OK) { goto error2; } /* key->d = 1/N mod pq */ 73 if ((err = mp_invmod( key->N, key->d, key->d)) != CRYPT_OK) { goto error2; } /* key->d = 1/N mod pq */
76 74
94 return err; 92 return err;
95 } 93 }
96 94
97 #endif 95 #endif
98 96
99 /* $Source$ */ 97 /* ref: $Format:%D$ */
100 /* $Revision$ */ 98 /* git commit: $Format:%H$ */
101 /* $Date$ */ 99 /* commit time: $Format:%ai$ */