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fs_mgr_fstab: Add Adiantum support 

Adiantum is a crypto method Android is supporting for devices
which don't have AES CPU instructions.  See the paper
"Adiantum: length-preserving encryption for entry-level processors"
(https://eprint.iacr.org/2018/720.pdf) for more details.

We add Adiantum to our list of supported encryption modes.

Bug: 112010205
Test: Tested on a device
Change-Id: I14a400164803a1e217d378ad9bd8b67a61b8b7d0
This commit is contained in:
Greg Kaiser 2018-12-03 12:30:42 -08:00
parent 8ae3ca87fd
commit eefd2e9006
1 changed files with 5 additions and 0 deletions
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5
fs_mgr/fs_mgr_fstab.cpp
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@ -120,9 +120,11 @@ static struct flag_list fs_mgr_flags[] = {
#define EM_ICE 2
#define EM_AES_256_CTS 3
#define EM_AES_256_HEH 4
#define EM_ADIANTUM 5
static const struct flag_list file_contents_encryption_modes[] = {
{"aes-256-xts", EM_AES_256_XTS},
{"adiantum", EM_ADIANTUM},
{"software", EM_AES_256_XTS}, /* alias for backwards compatibility */
{"ice", EM_ICE}, /* hardware-specific inline cryptographic engine */
{0, 0},
@ -131,6 +133,7 @@ static const struct flag_list file_contents_encryption_modes[] = {
static const struct flag_list file_names_encryption_modes[] = {
{"aes-256-cts", EM_AES_256_CTS},
{"aes-256-heh", EM_AES_256_HEH},
{"adiantum", EM_ADIANTUM},
{0, 0},
};
@ -271,6 +274,8 @@ static int parse_flags(char *flags, struct flag_list *fl,
flag_vals->file_names_mode =
encryption_mode_to_flag(file_names_encryption_modes,
colon + 1, "file names");
} else if (flag_vals->file_contents_mode == EM_ADIANTUM) {
flag_vals->file_names_mode = EM_ADIANTUM;
} else {
flag_vals->file_names_mode = EM_AES_256_CTS;
}