Mercurial > dropbear
view libtomcrypt/src/pk/dsa/dsa_set.c @ 1833:870f6e386a0b
Partial strings from strtoul should return error
author | Matt Johnston <matt@codeconstruct.com.au> |
---|---|
date | Tue, 12 Oct 2021 23:31:09 +0800 |
parents | 6dba84798cd5 |
children |
line wrap: on
line source
/* 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_MDSA /** Import DSA's p, q & g from raw numbers @param p DSA's p in binary representation @param plen The length of p @param q DSA's q in binary representation @param qlen The length of q @param g DSA's g in binary representation @param glen The length of g @param key [out] the destination for the imported key @return CRYPT_OK if successful. */ int dsa_set_pqg(const unsigned char *p, unsigned long plen, const unsigned char *q, unsigned long qlen, const unsigned char *g, unsigned long glen, dsa_key *key) { int err, stat; LTC_ARGCHK(p != NULL); LTC_ARGCHK(q != NULL); LTC_ARGCHK(g != NULL); LTC_ARGCHK(key != NULL); LTC_ARGCHK(ltc_mp.name != NULL); /* init key */ err = mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL); if (err != CRYPT_OK) return err; if ((err = mp_read_unsigned_bin(key->p, (unsigned char *)p , plen)) != CRYPT_OK) { goto LBL_ERR; } if ((err = mp_read_unsigned_bin(key->g, (unsigned char *)g , glen)) != CRYPT_OK) { goto LBL_ERR; } if ((err = mp_read_unsigned_bin(key->q, (unsigned char *)q , qlen)) != CRYPT_OK) { goto LBL_ERR; } key->qord = mp_unsigned_bin_size(key->q); /* do only a quick validation, without primality testing */ if ((err = dsa_int_validate_pqg(key, &stat)) != CRYPT_OK) { goto LBL_ERR; } if (stat == 0) { err = CRYPT_INVALID_PACKET; goto LBL_ERR; } return CRYPT_OK; LBL_ERR: dsa_free(key); return err; } /** Import DSA public or private key-part from raw numbers NB: The p, q & 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 dsa_set_key(const unsigned char *in, unsigned long inlen, int type, dsa_key *key) { int err, stat = 0; LTC_ARGCHK(key != NULL); LTC_ARGCHK(key->x != NULL); LTC_ARGCHK(key->y != NULL); LTC_ARGCHK(key->p != NULL); LTC_ARGCHK(key->g != NULL); LTC_ARGCHK(key->q != 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->g, key->x, key->p, 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; } } if ((err = dsa_int_validate_xy(key, &stat)) != CRYPT_OK) { goto LBL_ERR; } if (stat == 0) { err = CRYPT_INVALID_PACKET; goto LBL_ERR; } return CRYPT_OK; LBL_ERR: dsa_free(key); return err; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */