DSA: Check for sanity of input parameters
dsa_builtin_paramgen2 expects the L parameter to be greater than N,
otherwise the generation will get stuck in an infinite loop.
@@ -327,6 +327,12 @@ int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
if (mctx == NULL)
goto err;
+ /* make sure L > N, otherwise we'll get trapped in an infinite loop */
+ if (L <= N) {
+ DSAerr(DSA_F_DSA_BUILTIN_PARAMGEN2, DSA_R_INVALID_PARAMETERS);
+ goto err;
+ }
+
if (evpmd == NULL) {
if (N == 160)
evpmd = EVP_sha1();
