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DH: stop setting the private key length arbitrarily

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The private key length is supposed to be a user settable parameter.
We do check if it's set or not, and if not, we do apply defaults.

Fixes 

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13140)
This commit is contained in:
Richard Levitte 2020-10-15 07:14:16 +02:00
parent 09803e9ce3
commit 28e1d588f1
3 changed files with 5 additions and 15 deletions

2
crypto/dh/dh_backend.c

@ -30,7 +30,7 @@ static int dh_ffc_params_fromdata(DH *dh, const OSSL_PARAM params[])
ret = ossl_ffc_params_fromdata(ffc, params);
if (ret)
dh_cache_named_group(dh); /* This increments dh->dirt_cnt */
dh_cache_named_group(dh); /* This increments dh->dirty_cnt */
return ret;
}

5
crypto/dh/dh_key.c

@ -277,7 +277,10 @@ static int generate_key(DH *dh)
goto err;
#else
if (dh->params.q == NULL) {
/* secret exponent length */
/* secret exponent length, must satisfy 2^(l-1) <= p */
if (dh->length != 0
&& dh->length >= BN_num_bits(dh->params.p))
goto err;
l = dh->length ? dh->length : BN_num_bits(dh->params.p) - 1;
if (!BN_priv_rand_ex(priv_key, l, BN_RAND_TOP_ONE,
BN_RAND_BOTTOM_ANY, ctx))

13
crypto/dh/dh_lib.c

@ -219,18 +219,6 @@ int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
ossl_ffc_params_set0_pqg(&dh->params, p, q, g);
dh_cache_named_group(dh);
if (q != NULL)
dh->length = BN_num_bits(q);
/*
* Check if this is a named group. If it finds a named group then the
* 'q' and 'length' value are either already set or are set by the
* call.
*/
if (DH_get_nid(dh) == NID_undef) {
/* If its not a named group then set the 'length' if q is not NULL */
if (q != NULL)
dh->length = BN_num_bits(q);
}
dh->dirty_cnt++;
return 1;
}
@ -264,7 +252,6 @@ int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
if (priv_key != NULL) {
BN_clear_free(dh->priv_key);
dh->priv_key = priv_key;
dh->length = BN_num_bits(priv_key);
}
dh->dirty_cnt++;