Commit 2a5831b1 authored by Eric Biggers's avatar Eric Biggers
Browse files

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/20191209204054.227736-1-ebiggers@kernel.org


Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
parent c64cfb98

fs/crypto/fscrypt_private.h

+1 −1
Original line number Diff line number Diff line
@@ -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);

fs/crypto/hkdf.c

+1 −1
Original line number Diff line number Diff line
@@ -112,7 +112,7 @@ out: 
 * 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)

{

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