ecryptfs: enhancing ecryptfs to be configurable with encryption type

enabled eCryptfs for qcom targets. In addition to the usual
options, a special mode 'aes-xts' was added for qcom ICE hw
encryption

Change-Id: I20c01adc46c977b4a5db0be9ff93384cda14bc56
Signed-off-by: Lina Zarivach <linaz@codeaurora.org>
Signed-off-by: Andrey Markovytch <andreym@codeaurora.org>
[gbroner@codeaurora.org: fix merge conflict]
Signed-off-by: Gilad Broner <gbroner@codeaurora.org>

1 files changed, 42 insertions, 0 deletions

diff --git a/include/linux/ecryptfs.h b/include/linux/ecryptfs.h
index 8d5ab998a222..4f3006ae2a42 100644
--- a/include/linux/ecryptfs.h
+++ b/include/linux/ecryptfs.h
@@ -1,6 +1,9 @@
 #ifndef _LINUX_ECRYPTFS_H
 #define _LINUX_ECRYPTFS_H
 
+struct inode;
+struct page;
+
 /* Version verification for shared data structures w/ userspace */
 #define ECRYPTFS_VERSION_MAJOR 0x00
 #define ECRYPTFS_VERSION_MINOR 0x04
@@ -41,6 +44,7 @@
 #define RFC2440_CIPHER_AES_256 0x09
 #define RFC2440_CIPHER_TWOFISH 0x0a
 #define RFC2440_CIPHER_CAST_6 0x0b
+#define RFC2440_CIPHER_AES_XTS_256 0x0c
 
 #define RFC2440_CIPHER_RSA 0x01
 
@@ -102,4 +106,42 @@ struct ecryptfs_auth_tok {
 	} token;
 } __attribute__ ((packed));
 
+#define ECRYPTFS_INVALID_EVENTS_HANDLE -1
+
+/**
+ * ecryptfs_events struct represents a partial interface
+ * towards ecryptfs module. If registered to ecryptfs events,
+ * one can receive push notifications.
+ * A first callback received from ecryptfs will probably be
+ * about file opening (open_cb),
+ * in which ecryptfs passes its ecryptfs_data for future usage.
+ * This data represents a file and must be passed in every query functions
+ * such as ecryptfs_get_key_size(), ecryptfs_get_cipher() etc.
+ */
+struct ecryptfs_events {
+	bool (*is_cipher_supported_cb)(char *cipher);
+	void (*open_cb)(struct inode *inode, void *ecrytpfs_data);
+	void (*release_cb)(struct inode *inode);
+	int (*encrypt_cb)(struct page *in_page, struct page *out_page,
+		struct inode *inode, unsigned long extent_offset);
+	int (*decrypt_cb)(struct page *in_page, struct page *out_page,
+		struct inode *inode, unsigned long extent_offset);
+	bool (*is_hw_crypt_cb)(void);
+};
+
+
+int ecryptfs_register_to_events(struct ecryptfs_events *ops);
+
+int ecryptfs_unregister_from_events(int user_handle);
+
+const unsigned char *ecryptfs_get_key(void *ecrytpfs_data);
+
+size_t ecryptfs_get_key_size(void *ecrytpfs_data);
+
+const unsigned char *ecryptfs_get_cipher(void *ecrytpfs_data);
+
+bool ecryptfs_is_page_in_metadata(void *ecrytpfs_data, pgoff_t offset);
+
+bool ecryptfs_is_data_equal(void *ecrytpfs_data1, void *ecrytpfs_data2);
+
 #endif /* _LINUX_ECRYPTFS_H */