1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 /* 3 * fscrypt user API 4 * 5 * These ioctls can be used on filesystems that support fscrypt. See the 6 * "User API" section of Documentation/filesystems/fscrypt.rst. 7 */ 8 #ifndef _UAPI_LINUX_FSCRYPT_H 9 #define _UAPI_LINUX_FSCRYPT_H 10 11 #include <linux/types.h> 12 13 #define FSCRYPT_KEY_DESCRIPTOR_SIZE 8 14 15 /* Encryption policy flags */ 16 #define FSCRYPT_POLICY_FLAGS_PAD_4 0x00 17 #define FSCRYPT_POLICY_FLAGS_PAD_8 0x01 18 #define FSCRYPT_POLICY_FLAGS_PAD_16 0x02 19 #define FSCRYPT_POLICY_FLAGS_PAD_32 0x03 20 #define FSCRYPT_POLICY_FLAGS_PAD_MASK 0x03 21 #define FSCRYPT_POLICY_FLAG_DIRECT_KEY 0x04 /* use master key directly */ 22 #define FSCRYPT_POLICY_FLAGS_VALID 0x07 23 24 /* Encryption algorithms */ 25 #define FSCRYPT_MODE_AES_256_XTS 1 26 #define FSCRYPT_MODE_AES_256_CTS 4 27 #define FSCRYPT_MODE_AES_128_CBC 5 28 #define FSCRYPT_MODE_AES_128_CTS 6 29 #define FSCRYPT_MODE_ADIANTUM 9 30 31 struct fscrypt_policy { 32 __u8 version; 33 __u8 contents_encryption_mode; 34 __u8 filenames_encryption_mode; 35 __u8 flags; 36 __u8 master_key_descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE]; 37 }; 38 39 #define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy) 40 #define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 41 #define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy) 42 43 /* Parameters for passing an encryption key into the kernel keyring */ 44 #define FSCRYPT_KEY_DESC_PREFIX "fscrypt:" 45 #define FSCRYPT_KEY_DESC_PREFIX_SIZE 8 46 47 /* Structure that userspace passes to the kernel keyring */ 48 #define FSCRYPT_MAX_KEY_SIZE 64 49 50 struct fscrypt_key { 51 __u32 mode; 52 __u8 raw[FSCRYPT_MAX_KEY_SIZE]; 53 __u32 size; 54 }; 55 /**********************************************************************/ 56 57 /* old names; don't add anything new here! */ 58 #define FS_KEY_DESCRIPTOR_SIZE FSCRYPT_KEY_DESCRIPTOR_SIZE 59 #define FS_POLICY_FLAGS_PAD_4 FSCRYPT_POLICY_FLAGS_PAD_4 60 #define FS_POLICY_FLAGS_PAD_8 FSCRYPT_POLICY_FLAGS_PAD_8 61 #define FS_POLICY_FLAGS_PAD_16 FSCRYPT_POLICY_FLAGS_PAD_16 62 #define FS_POLICY_FLAGS_PAD_32 FSCRYPT_POLICY_FLAGS_PAD_32 63 #define FS_POLICY_FLAGS_PAD_MASK FSCRYPT_POLICY_FLAGS_PAD_MASK 64 #define FS_POLICY_FLAG_DIRECT_KEY FSCRYPT_POLICY_FLAG_DIRECT_KEY 65 #define FS_POLICY_FLAGS_VALID FSCRYPT_POLICY_FLAGS_VALID 66 #define FS_ENCRYPTION_MODE_INVALID 0 /* never used */ 67 #define FS_ENCRYPTION_MODE_AES_256_XTS FSCRYPT_MODE_AES_256_XTS 68 #define FS_ENCRYPTION_MODE_AES_256_GCM 2 /* never used */ 69 #define FS_ENCRYPTION_MODE_AES_256_CBC 3 /* never used */ 70 #define FS_ENCRYPTION_MODE_AES_256_CTS FSCRYPT_MODE_AES_256_CTS 71 #define FS_ENCRYPTION_MODE_AES_128_CBC FSCRYPT_MODE_AES_128_CBC 72 #define FS_ENCRYPTION_MODE_AES_128_CTS FSCRYPT_MODE_AES_128_CTS 73 #define FS_ENCRYPTION_MODE_SPECK128_256_XTS 7 /* removed */ 74 #define FS_ENCRYPTION_MODE_SPECK128_256_CTS 8 /* removed */ 75 #define FS_ENCRYPTION_MODE_ADIANTUM FSCRYPT_MODE_ADIANTUM 76 #define FS_KEY_DESC_PREFIX FSCRYPT_KEY_DESC_PREFIX 77 #define FS_KEY_DESC_PREFIX_SIZE FSCRYPT_KEY_DESC_PREFIX_SIZE 78 #define FS_MAX_KEY_SIZE FSCRYPT_MAX_KEY_SIZE 79 80 #endif /* _UAPI_LINUX_FSCRYPT_H */ 81