Commit 1a76a85c authored by Bodo Möller's avatar Bodo Möller
Browse files

Undo DH_generate_key() change: s3_srvr.c was using it correctly

parent cf1b34ad

CHANGES

+0 −11
Original line number Diff line number Diff line
@@ -10,17 +10,6 @@ 
     This made problems when used from OpenSSH.

     [Lutz Jaenicke]



  *) In crypto/dh/dh_key.c, change generate_key() (the default

     implementation of DH_generate_key()) so that a new key is

     generated each time DH_generate_key() is used on a DH object.



     Previously, DH_generate_key() did not change existing keys

     -- but ssl/s3_srvr.c always expected it to do so (in effect,

     SSL_OP_SINGLE_DH_USE was ignored in servers reusing the same SSL

     object for multiple connections; however, each new SSL object

     created from an SSL_CTX got its own key).

     [Bodo Moeller]



  *) In OpenSSL 0.9.6a and 0.9.6b, crypto/dh/dh_key.c ignored

     dh->length and always used

crypto/dh/dh_key.c

+6 −1
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ DH_METHOD *DH_OpenSSL(void) 
static int generate_key(DH *dh)

	{

	int ok=0;

	int generate_new_key=0;

	unsigned l;

	BN_CTX ctx;

	BN_MONT_CTX *mont;
@@ -110,6 +111,7 @@ static int generate_key(DH *dh) 
		{

		priv_key=BN_new();

		if (priv_key == NULL) goto err;

		generate_new_key=1;

		}

	else

		priv_key=dh->priv_key;
@@ -132,7 +134,10 @@ static int generate_key(DH *dh) 


	l = dh->length ? dh->length : BN_num_bits(dh->p)-1; /* secret exponent length */



	if (generate_new_key)

		{

		if (!BN_rand(priv_key, l, 0, 0)) goto err;

		}

	if (!dh->meth->bn_mod_exp(dh, pub_key,dh->g,priv_key,dh->p,&ctx,mont)) goto err;

		

	dh->pub_key=pub_key;

doc/crypto/DH_generate_key.pod

+3 −4
Original line number Diff line number Diff line
@@ -21,8 +21,9 @@ value to compute the shared key. 


DH_generate_key() expects B<dh> to contain the shared parameters

B<dh-E<gt>p> and B<dh-E<gt>g>. It generates a random private DH value

B<dh-E<gt>priv_key>, and it computes the corresponding public value

B<dh-E<gt>pub_key>, which can then be published.

unless B<dh-E<gt>priv_key> is already set, and computes the

corresponding public value B<dh-E<gt>pub_key>, which can then be

published.



DH_compute_key() computes the shared secret from the private DH value

in B<dh> and the other party's public value in B<pub_key> and stores
@@ -45,7 +46,5 @@ L<dh(3)|dh(3)>, L<err(3)|err(3)>, L<rand(3)|rand(3)>, L<DH_size(3)|DH_size(3)> 


DH_generate_key() and DH_compute_key() are available in all versions

of SSLeay and OpenSSL.

Up to version 0.9.6b, DH_generate_key() would not generate a new

key if B<dh-E<gt>priv_key> was already set.



=cut