ec: Fail build on big-endian with enable-ec_nistp_64_gcc_128

I can't see way of making Configure fail but this at least makes the build fail. Fixes #15821 Signed-off-by: Martin Schwenke <martin@meltin.net> Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from #15831)
openssl · Jun 22, 2021 · cd5fea4 · cd5fea4
1 parent f31bbef
commit cd5fea4
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/crypto/ec/ec_local.h b/crypto/ec/ec_local.h
@@ -508,6 +508,10 @@ int ossl_ec_GF2m_simple_field_div(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
                                  const BIGNUM *b, BN_CTX *);
 
 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
+# ifdef B_ENDIAN
+#  error "Can not enable ec_nistp_64_gcc_128 on big-endian systems"
+# endif
+
 /* method functions in ecp_nistp224.c */
 int ossl_ec_GFp_nistp224_group_init(EC_GROUP *group);
 int ossl_ec_GFp_nistp224_group_set_curve(EC_GROUP *group, const BIGNUM *p,