crypto: Kconfig - mark unused ciphers as obsolete

We have a few interesting pieces in our cipher museum, which are never
used internally, and were only ever provided as generic C implementations.

Unfortunately, we cannot simply remove this code, as we cannot be sure
that it is not being used via the AF_ALG socket API, however unlikely.

So let's mark the Anubis, Khazad, SEED and TEA algorithms as obsolete,
which means they can only be enabled in the build if the socket API is
enabled in the first place.

Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

crypto/Kconfig

@@ -1185,6 +1185,7 @@ config CRYPTO_AES_PPC_SPE
 
 config CRYPTO_ANUBIS
 	tristate "Anubis cipher algorithm"
+	depends on CRYPTO_USER_API_ENABLE_OBSOLETE
 	select CRYPTO_ALGAPI
 	help
 	  Anubis cipher algorithm.
@@ -1424,6 +1425,7 @@ config CRYPTO_FCRYPT
 
 config CRYPTO_KHAZAD
 	tristate "Khazad cipher algorithm"
+	depends on CRYPTO_USER_API_ENABLE_OBSOLETE
 	select CRYPTO_ALGAPI
 	help
 	  Khazad cipher algorithm.
@@ -1487,6 +1489,7 @@ config CRYPTO_CHACHA_MIPS
 
 config CRYPTO_SEED
 	tristate "SEED cipher algorithm"
+	depends on CRYPTO_USER_API_ENABLE_OBSOLETE
 	select CRYPTO_ALGAPI
 	help
 	  SEED cipher algorithm (RFC4269).
@@ -1613,6 +1616,7 @@ config CRYPTO_SM4
 
 config CRYPTO_TEA
 	tristate "TEA, XTEA and XETA cipher algorithms"
+	depends on CRYPTO_USER_API_ENABLE_OBSOLETE
 	select CRYPTO_ALGAPI
 	help
 	  TEA cipher algorithm.