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48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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/**
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@file dsa_make_key.c
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DSA implementation, generate a DSA key
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*/
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#ifdef LTC_MDSA
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/**
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Create a DSA key
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@param prng An active PRNG state
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@param wprng The index of the PRNG desired
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@param key [in/out] Where to store the created key
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@return CRYPT_OK if successful.
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*/
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int dsa_generate_key(prng_state *prng, int wprng, dsa_key *key)
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{
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int err;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(ltc_mp.name != NULL);
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/* so now we have our DH structure, generator g, order q, modulus p
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Now we need a random exponent [mod q] and it's power g^x mod p
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*/
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/* private key x should be from range: 1 <= x <= q-1 (see FIPS 186-4 B.1.2) */
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if ((err = rand_bn_upto(key->x, key->q, prng, wprng)) != CRYPT_OK) { return err; }
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if ((err = mp_exptmod(key->g, key->x, key->p, key->y)) != CRYPT_OK) { return err; }
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key->type = PK_PRIVATE;
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return CRYPT_OK;
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}
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#endif
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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