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