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-rw-r--r--crypto/md5/md5.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/md5/md5.h b/crypto/md5/md5.h
index fc767872ed..6e97fe1e4f 100644
--- a/crypto/md5/md5.h
+++ b/crypto/md5/md5.h
@@ -63,6 +63,10 @@
extern "C" {
#endif
+#ifdef NO_MD5
+#error MD5 is disabled.
+#endif
+
#define MD5_CBLOCK 64
#define MD5_LBLOCK 16
#define MD5_BLOCK 16