Mercurial > dropbear
view libtomcrypt/src/pk/dh/dh_set.c @ 1613:caa9bb54dfa0
fix #endif (#59)
author | François Perrad <francois.perrad@gadz.org> |
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date | Wed, 28 Feb 2018 15:10:14 +0100 |
parents | 6dba84798cd5 |
children |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. */ #include "tomcrypt.h" #ifdef LTC_MDH /** Import DH key parts p and g from raw numbers @param p DH's p (prime) @param plen DH's p's length @param g DH's g (group) @param glen DH's g's length @param key [out] the destination for the imported key @return CRYPT_OK if successful */ int dh_set_pg(const unsigned char *p, unsigned long plen, const unsigned char *g, unsigned long glen, dh_key *key) { int err; LTC_ARGCHK(key != NULL); LTC_ARGCHK(p != NULL); LTC_ARGCHK(g != NULL); LTC_ARGCHK(ltc_mp.name != NULL); if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) { return err; } if ((err = mp_read_unsigned_bin(key->base, (unsigned char*)g, glen)) != CRYPT_OK) { goto LBL_ERR; } if ((err = mp_read_unsigned_bin(key->prime, (unsigned char*)p, plen)) != CRYPT_OK) { goto LBL_ERR; } return CRYPT_OK; LBL_ERR: dh_free(key); return err; } /** Import DH key parts p and g from built-in DH groups @param groupsize The size of the DH group to use @param key [out] Where the newly created DH key will be stored @return CRYPT_OK if successful, note: on error all allocated memory will be freed automatically. */ int dh_set_pg_groupsize(int groupsize, dh_key *key) { int err, i; LTC_ARGCHK(key != NULL); LTC_ARGCHK(ltc_mp.name != NULL); LTC_ARGCHK(groupsize > 0); for (i = 0; (groupsize > ltc_dh_sets[i].size) && (ltc_dh_sets[i].size != 0); i++); if (ltc_dh_sets[i].size == 0) return CRYPT_INVALID_KEYSIZE; if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) { return err; } if ((err = mp_read_radix(key->base, ltc_dh_sets[i].base, 16)) != CRYPT_OK) { goto LBL_ERR; } if ((err = mp_read_radix(key->prime, ltc_dh_sets[i].prime, 16)) != CRYPT_OK) { goto LBL_ERR; } return CRYPT_OK; LBL_ERR: dh_free(key); return err; } /** Import DH public or private key part from raw numbers NB: The p & g parts must be set beforehand @param in The key-part to import, either public or private. @param inlen The key-part's length @param type Which type of key (PK_PRIVATE or PK_PUBLIC) @param key [out] the destination for the imported key @return CRYPT_OK if successful */ int dh_set_key(const unsigned char *in, unsigned long inlen, int type, dh_key *key) { int err; LTC_ARGCHK(key != NULL); LTC_ARGCHK(ltc_mp.name != NULL); if (type == PK_PRIVATE) { key->type = PK_PRIVATE; if ((err = mp_read_unsigned_bin(key->x, (unsigned char*)in, inlen)) != CRYPT_OK) { goto LBL_ERR; } if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) { goto LBL_ERR; } } else { key->type = PK_PUBLIC; if ((err = mp_read_unsigned_bin(key->y, (unsigned char*)in, inlen)) != CRYPT_OK) { goto LBL_ERR; } } /* check public key */ if ((err = dh_check_pubkey(key)) != CRYPT_OK) { goto LBL_ERR; } return CRYPT_OK; LBL_ERR: dh_free(key); return err; } #endif /* LTC_MDH */ /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */