Mercurial > dropbear
diff libtomcrypt/src/pk/dsa/dsa_generate_key.c @ 1471:6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 09 Feb 2018 21:44:05 +0800 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libtomcrypt/src/pk/dsa/dsa_generate_key.c Fri Feb 09 21:44:05 2018 +0800 @@ -0,0 +1,47 @@ +/* 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" + +/** + @file dsa_make_key.c + DSA implementation, generate a DSA key +*/ + +#ifdef LTC_MDSA + +/** + Create a DSA key + @param prng An active PRNG state + @param wprng The index of the PRNG desired + @param key [in/out] Where to store the created key + @return CRYPT_OK if successful. +*/ +int dsa_generate_key(prng_state *prng, int wprng, dsa_key *key) +{ + int err; + + LTC_ARGCHK(key != NULL); + LTC_ARGCHK(ltc_mp.name != NULL); + + /* so now we have our DH structure, generator g, order q, modulus p + Now we need a random exponent [mod q] and it's power g^x mod p + */ + /* private key x should be from range: 1 <= x <= q-1 (see FIPS 186-4 B.1.2) */ + if ((err = rand_bn_upto(key->x, key->q, prng, wprng)) != CRYPT_OK) { return err; } + if ((err = mp_exptmod(key->g, key->x, key->p, key->y)) != CRYPT_OK) { return err; } + key->type = PK_PRIVATE; + + return CRYPT_OK; +} + +#endif + +/* ref: $Format:%D$ */ +/* git commit: $Format:%H$ */ +/* commit time: $Format:%ai$ */