shash_desc_zero() and ahash_request_zero() were added in Linux commit
e67ffe0af "crypto: hash - Add helpers to zero stack request/descriptor".
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/crypto/hash.h | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
create mode 100644 backport/backport-include/crypto/hash.h
diff --git a/backport/backport-include/crypto/hash.h b/backport/backport-include/crypto/hash.h
new file mode 100644
index 0000000..18cb630
--- /dev/null
+++ b/backport/backport-include/crypto/hash.h
@@ -0,0 +1,24 @@
+#ifndef _BACKPORT_CRYPTO_HASH_H
+#define _BACKPORT_CRYPTO_HASH_H
+#include_next <crypto/hash.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
+#define shash_desc_zero LINUX_BACKPORT(shash_desc_zero)
+static inline void shash_desc_zero(struct shash_desc *desc)
+{
+ memzero_explicit(desc,
+ sizeof(*desc) + crypto_shash_descsize(desc->tfm));
+}
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
+#define ahash_request_zero LINUX_BACKPORT(ahash_request_zero)
+static inline void ahash_request_zero(struct ahash_request *req)
+{
+ memzero_explicit(req, sizeof(*req) +
+ crypto_ahash_reqsize(crypto_ahash_reqtfm(req)));
+}
+#endif
+
+#endif /* _BACKPORT_CRYPTO_HASH_H */
--
2.8.1
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