1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
5 * These ioctls can be used on filesystems that support llcrypt. See the
6 * "User API" section of Documentation/filesystems/llcrypt.rst.
9 * Linux commit 219d54332a09
12 #ifndef _UAPI_LINUX_LLCRYPT_H
13 #define _UAPI_LINUX_LLCRYPT_H
15 #include <linux/types.h>
17 /* Encryption policy flags */
18 #define LLCRYPT_POLICY_FLAGS_PAD_4 0x00
19 #define LLCRYPT_POLICY_FLAGS_PAD_8 0x01
20 #define LLCRYPT_POLICY_FLAGS_PAD_16 0x02
21 #define LLCRYPT_POLICY_FLAGS_PAD_32 0x03
22 #define LLCRYPT_POLICY_FLAGS_PAD_MASK 0x03
23 #define LLCRYPT_POLICY_FLAG_DIRECT_KEY 0x04
24 #define LLCRYPT_POLICY_FLAGS_VALID 0x07
26 /* Encryption algorithms */
27 #define LLCRYPT_MODE_NULL 0
28 #define LLCRYPT_MODE_AES_256_XTS 1
29 #define LLCRYPT_MODE_AES_256_CTS 4
30 #define LLCRYPT_MODE_AES_128_CBC 5
31 #define LLCRYPT_MODE_AES_128_CTS 6
32 #define LLCRYPT_MODE_ADIANTUM 9
33 #define __LLCRYPT_MODE_MAX 9
36 * Legacy policy version; ad-hoc KDF and no key verification.
37 * For new encrypted directories, use llcrypt_policy_v2 instead.
39 * Careful: the .version field for this is actually 0, not 1.
41 #define LLCRYPT_POLICY_V1 0
42 #define LLCRYPT_KEY_DESCRIPTOR_SIZE 8
43 struct llcrypt_policy_v1 {
45 __u8 contents_encryption_mode;
46 __u8 filenames_encryption_mode;
48 __u8 master_key_descriptor[LLCRYPT_KEY_DESCRIPTOR_SIZE];
50 #define llcrypt_policy llcrypt_policy_v1
53 * Process-subscribed "logon" key description prefix and payload format.
54 * Deprecated; prefer LL_IOC_ADD_ENCRYPTION_KEY instead.
56 #define LLCRYPT_KEY_DESC_PREFIX "fscrypt:"
57 #define LLCRYPT_KEY_DESC_PREFIX_SIZE 8
58 #define LLCRYPT_MAX_KEY_SIZE 64
61 __u8 raw[LLCRYPT_MAX_KEY_SIZE];
66 * New policy version with HKDF and key verification (recommended).
68 #define LLCRYPT_POLICY_V2 2
69 #define LLCRYPT_KEY_IDENTIFIER_SIZE 16
70 struct llcrypt_policy_v2 {
72 __u8 contents_encryption_mode;
73 __u8 filenames_encryption_mode;
76 __u8 master_key_identifier[LLCRYPT_KEY_IDENTIFIER_SIZE];
79 /* Struct passed to LL_IOC_GET_ENCRYPTION_POLICY_EX */
80 struct llcrypt_get_policy_ex_arg {
81 __u64 policy_size; /* input/output */
84 struct llcrypt_policy_v1 v1;
85 struct llcrypt_policy_v2 v2;
86 } policy; /* output */
90 * v1 policy keys are specified by an arbitrary 8-byte key "descriptor",
91 * matching llcrypt_policy_v1::master_key_descriptor.
93 #define LLCRYPT_KEY_SPEC_TYPE_DESCRIPTOR 1
96 * v2 policy keys are specified by a 16-byte key "identifier" which the kernel
97 * calculates as a cryptographic hash of the key itself,
98 * matching llcrypt_policy_v2::master_key_identifier.
100 #define LLCRYPT_KEY_SPEC_TYPE_IDENTIFIER 2
103 * Specifies a key, either for v1 or v2 policies. This doesn't contain the
104 * actual key itself; this is just the "name" of the key.
106 struct llcrypt_key_specifier {
107 __u32 type; /* one of LLCRYPT_KEY_SPEC_TYPE_* */
110 __u8 __reserved[32]; /* reserve some extra space */
111 __u8 descriptor[LLCRYPT_KEY_DESCRIPTOR_SIZE];
112 __u8 identifier[LLCRYPT_KEY_IDENTIFIER_SIZE];
116 /* Struct passed to LL_IOC_ADD_ENCRYPTION_KEY */
117 struct llcrypt_add_key_arg {
118 struct llcrypt_key_specifier key_spec;
124 /* Struct passed to LL_IOC_REMOVE_ENCRYPTION_KEY */
125 struct llcrypt_remove_key_arg {
126 struct llcrypt_key_specifier key_spec;
127 #define LLCRYPT_KEY_REMOVAL_STATUS_FLAG_FILES_BUSY 0x00000001
128 #define LLCRYPT_KEY_REMOVAL_STATUS_FLAG_OTHER_USERS 0x00000002
129 __u32 removal_status_flags; /* output */
133 /* Struct passed to LL_IOC_GET_ENCRYPTION_KEY_STATUS */
134 struct llcrypt_get_key_status_arg {
136 struct llcrypt_key_specifier key_spec;
140 #define LLCRYPT_KEY_STATUS_ABSENT 1
141 #define LLCRYPT_KEY_STATUS_PRESENT 2
142 #define LLCRYPT_KEY_STATUS_INCOMPLETELY_REMOVED 3
144 #define LLCRYPT_KEY_STATUS_FLAG_ADDED_BY_SELF 0x00000001
147 __u32 __out_reserved[13];
150 #define LL_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct llcrypt_policy)
151 #define LL_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
152 #define LL_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct llcrypt_policy)
153 #define LL_IOC_GET_ENCRYPTION_POLICY_EX _IOWR('f', 22, __u8[9]) /* size + version */
154 #define LL_IOC_ADD_ENCRYPTION_KEY _IOWR('f', 23, struct llcrypt_add_key_arg)
155 #define LL_IOC_REMOVE_ENCRYPTION_KEY _IOWR('f', 24, struct llcrypt_remove_key_arg)
156 #define LL_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS _IOWR('f', 25, struct llcrypt_remove_key_arg)
157 #define LL_IOC_GET_ENCRYPTION_KEY_STATUS _IOWR('f', 26, struct llcrypt_get_key_status_arg)
159 /**********************************************************************/
161 /* old names; don't add anything new here! */
163 #define LL_KEY_DESCRIPTOR_SIZE LLCRYPT_KEY_DESCRIPTOR_SIZE
164 #define LL_POLICY_FLAGS_PAD_4 LLCRYPT_POLICY_FLAGS_PAD_4
165 #define LL_POLICY_FLAGS_PAD_8 LLCRYPT_POLICY_FLAGS_PAD_8
166 #define LL_POLICY_FLAGS_PAD_16 LLCRYPT_POLICY_FLAGS_PAD_16
167 #define LL_POLICY_FLAGS_PAD_32 LLCRYPT_POLICY_FLAGS_PAD_32
168 #define LL_POLICY_FLAGS_PAD_MASK LLCRYPT_POLICY_FLAGS_PAD_MASK
169 #define LL_POLICY_FLAG_DIRECT_KEY LLCRYPT_POLICY_FLAG_DIRECT_KEY
170 #define LL_POLICY_FLAGS_VALID LLCRYPT_POLICY_FLAGS_VALID
171 #define LL_ENCRYPTION_MODE_INVALID 0 /* never used */
172 #define LL_ENCRYPTION_MODE_AES_256_XTS LLCRYPT_MODE_AES_256_XTS
173 #define LL_ENCRYPTION_MODE_AES_256_GCM 2 /* never used */
174 #define LL_ENCRYPTION_MODE_AES_256_CBC 3 /* never used */
175 #define LL_ENCRYPTION_MODE_AES_256_CTS LLCRYPT_MODE_AES_256_CTS
176 #define LL_ENCRYPTION_MODE_AES_128_CBC LLCRYPT_MODE_AES_128_CBC
177 #define LL_ENCRYPTION_MODE_AES_128_CTS LLCRYPT_MODE_AES_128_CTS
178 #define LL_ENCRYPTION_MODE_SPECK128_256_XTS 7 /* removed */
179 #define LL_ENCRYPTION_MODE_SPECK128_256_CTS 8 /* removed */
180 #define LL_ENCRYPTION_MODE_ADIANTUM LLCRYPT_MODE_ADIANTUM
181 #define LL_KEY_DESC_PREFIX LLCRYPT_KEY_DESC_PREFIX
182 #define LL_KEY_DESC_PREFIX_SIZE LLCRYPT_KEY_DESC_PREFIX_SIZE
183 #define LL_MAX_KEY_SIZE LLCRYPT_MAX_KEY_SIZE
184 #endif /* !__KERNEL__ */
186 #endif /* _UAPI_LINUX_LLCRYPT_H */