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-rw-r--r--crypto/bf/blowfish.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/bf/blowfish.h b/crypto/bf/blowfish.h
index 005d0ed7b6..a18dfee1a4 100644
--- a/crypto/bf/blowfish.h
+++ b/crypto/bf/blowfish.h
@@ -63,6 +63,10 @@
extern "C" {
#endif
+#ifdef NO_BF
+#error BF is disabled.
+#endif
+
#define BF_ENCRYPT 1
#define BF_DECRYPT 0