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Support entries which are writable even when the storage is locked. Needed for U2F counter on Trezor 1.

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This commit is contained in:
andrew 2019-02-08 17:50:27 +01:00
parent 0497802014
commit 18fa999974
1 changed files with 14 additions and 2 deletions
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16
storage.c
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@ -62,6 +62,10 @@
// If the top bit of APP is set, then the value is not encrypted.
#define FLAG_PUBLIC 0x80
// If the top two bits of APP are set, then the value is not encrypted and it
// can be written even when the storage is locked.
#define FLAGS_WRITE 0xC0
// The length of the guard key in words.
#define GUARD_KEY_WORDS 1
@ -926,7 +930,11 @@ secbool storage_set(const uint16_t key, const void *val, const uint16_t len)
const uint8_t app = key >> 8;
// APP == 0 is reserved for PIN related values
if (sectrue != initialized || sectrue != unlocked || app == APP_STORAGE) {
if (sectrue != initialized || app == APP_STORAGE) {
return secfalse;
}
if (sectrue != unlocked && (app & FLAGS_WRITE) != FLAGS_WRITE) {
return secfalse;
}
@ -944,7 +952,11 @@ secbool storage_delete(const uint16_t key)
const uint8_t app = key >> 8;
// APP == 0 is reserved for storage related values
if (sectrue != initialized || sectrue != unlocked || app == APP_STORAGE) {
if (sectrue != initialized || app == APP_STORAGE) {
return secfalse;
}
if (sectrue != unlocked && (app & FLAGS_WRITE) != FLAGS_WRITE) {
return secfalse;
}