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-rw-r--r--crypto/rc5/rc5.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/rc5/rc5.h b/crypto/rc5/rc5.h
index c18d943995..38e901502b 100644
--- a/crypto/rc5/rc5.h
+++ b/crypto/rc5/rc5.h
@@ -63,6 +63,10 @@
extern "C" {
#endif
+#ifdef NO_RC5
+#error RC5 is disabled.
+#endif
+
#define RC5_ENCRYPT 1
#define RC5_DECRYPT 0