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| author | Eric Biggers <ebiggers@google.com> | 2022-12-01 11:14:52 -0800 |
|---|---|---|
| committer | Eric Biggers <ebiggers@google.com> | 2022-12-02 10:43:00 -0800 |
| commit | 41952551acb405080726aa38a8a7ce317d9de4bb (patch) | |
| tree | 669ae17c6bdb13438008e2c8efad5fe00a73c8db | |
| parent | f8b435f93b7630afea2df958e0331c566496214b (diff) | |
fscrypt: add additional documentation for SM4 support
Add a paragraph about SM4, like there is for the other modes.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Link: https://lore.kernel.org/r/20221201191452.6557-1-ebiggers@kernel.org
| -rw-r--r-- | Documentation/filesystems/fscrypt.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst index c0784ec05553..ef183387da20 100644 --- a/Documentation/filesystems/fscrypt.rst +++ b/Documentation/filesystems/fscrypt.rst @@ -370,6 +370,12 @@ CONFIG_CRYPTO_HCTR2 must be enabled. Also, fast implementations of XCTR and POLYVAL should be enabled, e.g. CRYPTO_POLYVAL_ARM64_CE and CRYPTO_AES_ARM64_CE_BLK for ARM64. +SM4 is a Chinese block cipher that is an alternative to AES. It has +not seen as much security review as AES, and it only has a 128-bit key +size. It may be useful in cases where its use is mandated. +Otherwise, it should not be used. For SM4 support to be available, it +also needs to be enabled in the kernel crypto API. + New encryption modes can be added relatively easily, without changes to individual filesystems. However, authenticated encryption (AE) modes are not currently supported because of the difficulty of dealing |