Add support for default public key digest type ctrl.

crypto/dsa/dsa_ameth.c

@@ -544,6 +544,10 @@ static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 			}
 		return 1;
 
+		case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
+		*(int *)arg2 = NID_sha1;
+		return 2;
+
 		default:
 		return -2;