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7137cbf2b5
Update the "aes" module to implement "cmac(aes)", "xcbc(aes)", and "cbcmac(aes)" algorithms using the corresponding library functions, and register these with the crypto_shash API. Each algorithm is included only if the corresponding existing kconfig option is enabled. This allows the architecture-optimized implementations of these algorithms to continue to be accessible via the crypto_shash API once they are migrated into the library. For "xcbc(aes)", I also fixed the bug where AES key lengths other than 128 bits were allowed, so that this bug didn't have to be implemented in the library. The AES-XCBC-MAC specification (RFC 3566) is clear that key lengths other than 128 bits MUST NOT be supported. AES-XCBC-MAC derives a 128-bit subkey internally, so the nonstandard support for longer AES keys didn't really work: AES-128 was still used internally. In the unlikely event that someone is actually relying on the broken and nonstandard support for longer AES-XCBC-MAC keys, we can fairly easily reintroduce it. But it seems unnecessary: the only user of "xcbc(aes)" seems to be IPsec, which uses 128-bit keys with it. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20260218213501.136844-3-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
247 lines
6.7 KiB
247 lines
6.7 KiB