Make D-H safer, include well-known primes.

[openssl.git] / crypto / dh / dh_key.c

diff --git a/crypto/dh/dh_key.c b/crypto/dh/dh_key.c
index 39eefe387eab82b63a3e0a3c42097d4012771f44..cc17c8851b691daf2798cad861f56b03adb9cbb1 100644 (file)
--- a/crypto/dh/dh_key.c
+++ b/crypto/dh/dh_key.c
@@ -177,6 +177,7 @@ static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
        BN_MONT_CTX *mont=NULL;
        BIGNUM *tmp;
        int ret= -1;
+        int check_result;
 
        ctx = BN_CTX_new();
        if (ctx == NULL) goto err;
@@ -202,6 +203,12 @@ static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
                        goto err;
                }
 
+        if (!DH_check_pub_key(dh, pub_key, &check_result) || check_result)
+               {
+               DHerr(DH_F_COMPUTE_KEY,DH_R_INVALID_PUBKEY);
+               goto err;
+               }
+
        if (!dh->meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key,dh->p,ctx,mont))
                {
                DHerr(DH_F_COMPUTE_KEY,ERR_R_BN_LIB);