fscrypt: add comments that describe the HKDF info strings
Each HKDF context byte is associated with a specific format of the remaining part of the application-specific info string. Add comments so that it's easier to keep track of what these all are. Link: https://lore.kernel.org/r/20200708215529.146890-1-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
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@ -312,13 +312,13 @@ int fscrypt_init_hkdf(struct fscrypt_hkdf *hkdf, const u8 *master_key,
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* outputs are unique and cryptographically isolated, i.e. knowledge of one
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* output doesn't reveal another.
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*/
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#define HKDF_CONTEXT_KEY_IDENTIFIER 1
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#define HKDF_CONTEXT_PER_FILE_ENC_KEY 2
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#define HKDF_CONTEXT_DIRECT_KEY 3
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#define HKDF_CONTEXT_IV_INO_LBLK_64_KEY 4
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#define HKDF_CONTEXT_DIRHASH_KEY 5
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#define HKDF_CONTEXT_IV_INO_LBLK_32_KEY 6
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#define HKDF_CONTEXT_INODE_HASH_KEY 7
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#define HKDF_CONTEXT_KEY_IDENTIFIER 1 /* info=<empty> */
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#define HKDF_CONTEXT_PER_FILE_ENC_KEY 2 /* info=file_nonce */
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#define HKDF_CONTEXT_DIRECT_KEY 3 /* info=mode_num */
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#define HKDF_CONTEXT_IV_INO_LBLK_64_KEY 4 /* info=mode_num||fs_uuid */
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#define HKDF_CONTEXT_DIRHASH_KEY 5 /* info=file_nonce */
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#define HKDF_CONTEXT_IV_INO_LBLK_32_KEY 6 /* info=mode_num||fs_uuid */
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#define HKDF_CONTEXT_INODE_HASH_KEY 7 /* info=<empty> */
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int fscrypt_hkdf_expand(const struct fscrypt_hkdf *hkdf, u8 context,
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const u8 *info, unsigned int infolen,
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