fscrypt: constify struct fscrypt_hkdf parameter to fscrypt_hkdf_expand()

Constify the struct fscrypt_hkdf parameter to fscrypt_hkdf_expand(). This makes it clearer that struct fscrypt_hkdf contains the key only, not any per-request state. Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Eric Biggers <[email protected]>
jangid · Dec 31, 2019 · 2a5831b · 2a5831b
1 parent c64cfb9
commit 2a5831b
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
@@ -287,7 +287,7 @@ extern int fscrypt_init_hkdf(struct fscrypt_hkdf *hkdf, const u8 *master_key,
 #define HKDF_CONTEXT_DIRECT_KEY		3
 #define HKDF_CONTEXT_IV_INO_LBLK_64_KEY	4
 
-extern int fscrypt_hkdf_expand(struct fscrypt_hkdf *hkdf, u8 context,
+extern int fscrypt_hkdf_expand(const struct fscrypt_hkdf *hkdf, u8 context,
 			       const u8 *info, unsigned int infolen,
 			       u8 *okm, unsigned int okmlen);
 

diff --git a/fs/crypto/hkdf.c b/fs/crypto/hkdf.c
@@ -112,7 +112,7 @@ int fscrypt_init_hkdf(struct fscrypt_hkdf *hkdf, const u8 *master_key,
  * adds to its application-specific info strings to guarantee that it doesn't
  * accidentally repeat an info string when using HKDF for different purposes.)
  */
-int fscrypt_hkdf_expand(struct fscrypt_hkdf *hkdf, u8 context,
+int fscrypt_hkdf_expand(const struct fscrypt_hkdf *hkdf, u8 context,
 			const u8 *info, unsigned int infolen,
 			u8 *okm, unsigned int okmlen)
 {