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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/fs/crypto/Kconfig
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@@ -1,8 +1,10 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 config FS_ENCRYPTION
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 	bool "FS Encryption (Per-file encryption)"
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 	select CRYPTO
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 	select CRYPTO_HASH
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-	select CRYPTO_BLKCIPHER
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+	select CRYPTO_SKCIPHER
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+	select CRYPTO_LIB_SHA256
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 	select KEYS
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 	help
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 	  Enable encryption of files and directories.  This
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 	  F2FS and UBIFS make use of this feature.
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 # Filesystems supporting encryption must select this if FS_ENCRYPTION.  This
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-# allows the algorithms to be built as modules when all the filesystems are.
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+# allows the algorithms to be built as modules when all the filesystems are,
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+# whereas selecting them from FS_ENCRYPTION would force them to be built-in.
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+#
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+# Note: this option only pulls in the algorithms that filesystem encryption
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+# needs "by default".  If userspace will use "non-default" encryption modes such
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+# as Adiantum encryption, then those other modes need to be explicitly enabled
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+# in the crypto API; see Documentation/filesystems/fscrypt.rst for details.
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+#
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+# Also note that this option only pulls in the generic implementations of the
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+# algorithms, not any per-architecture optimized implementations.  It is
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+# strongly recommended to enable optimized implementations too.  It is safe to
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+# disable these generic implementations if corresponding optimized
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+# implementations will always be available too; for this reason, these are soft
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+# dependencies ('imply' rather than 'select').  Only disable these generic
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+# implementations if you're sure they will never be needed, though.
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 config FS_ENCRYPTION_ALGS
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 	tristate
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-	select CRYPTO_AES
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-	select CRYPTO_CBC
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-	select CRYPTO_CTS
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-	select CRYPTO_ECB
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-	select CRYPTO_HMAC
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-	select CRYPTO_SHA256
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-	select CRYPTO_SHA512
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-	select CRYPTO_XTS
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+	imply CRYPTO_AES
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+	imply CRYPTO_CBC
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+	imply CRYPTO_CTS
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+	imply CRYPTO_ECB
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+	imply CRYPTO_HMAC
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+	imply CRYPTO_SHA512
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+	imply CRYPTO_XTS
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 config FS_ENCRYPTION_INLINE_CRYPT
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 	bool "Enable fscrypt to use inline crypto"