1 files changed, 17 insertions, 1 deletions

diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 418d270e1806..e73c19e90e38 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -386,5 +386,21 @@ static inline int crypto_requires_sync(u32 type, u32 mask)
         return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
 }
 
-#endif  /* _CRYPTO_ALGAPI_H */
+noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
+
+/**
+ * crypto_memneq - Compare two areas of memory without leaking
+ *                 timing information.
+ *
+ * @a: One area of memory
+ * @b: Another area of memory
+ * @size: The size of the area.
+ *
+ * Returns 0 when data is equal, 1 otherwise.
+ */
+static inline int crypto_memneq(const void *a, const void *b, size_t size)
+{
+        return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
+}
 
+#endif  /* _CRYPTO_ALGAPI_H */