dearsky/pico-openpgp
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DO is cleared when no data is provided.

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Solves #50.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2026-02-18 00:38:52 +01:00
parent e6cc190c4f
commit 704df76499
1 changed files with 29 additions and 24 deletions
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53
src/openpgp/cmd_put_data.c
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@@ -45,36 +45,41 @@ int cmd_put_data() {
if (currentEF && currentEF->fid == fid) { // previously selected same EF if (currentEF && currentEF->fid == fid) { // previously selected same EF
ef = currentEF; ef = currentEF;
} }
if (apdu.nc > 0 && (ef->type & FILE_DATA_FLASH)) { if (ef->type & FILE_DATA_FLASH) {
int r = 0; int r = 0;
if (fid == EF_RC) { if (apdu.nc > 0) {
has_rc = false; if (fid == EF_RC) {
if ((r = load_dek()) != PICOKEY_OK) { has_rc = false;
return SW_EXEC_ERROR(); if ((r = load_dek()) != PICOKEY_OK) {
} return SW_EXEC_ERROR();
uint8_t dhash[33]; }
dhash[0] = apdu.nc; uint8_t dhash[33];
double_hash_pin(apdu.data, apdu.nc, dhash + 1); dhash[0] = apdu.nc;
r = file_put_data(ef, dhash, sizeof(dhash)); double_hash_pin(apdu.data, apdu.nc, dhash + 1);
r = file_put_data(ef, dhash, sizeof(dhash));
file_t *tf = search_by_fid(EF_DEK, NULL, SPECIFY_EF); file_t *tf = search_by_fid(EF_DEK, NULL, SPECIFY_EF);
if (!tf) { if (!tf) {
return SW_REFERENCE_NOT_FOUND(); return SW_REFERENCE_NOT_FOUND();
}
uint8_t def[IV_SIZE + 32 + 32 + 32 + 32];
memcpy(def, file_get_data(tf), file_get_size(tf));
hash_multi(apdu.data, apdu.nc, session_rc);
memcpy(def + IV_SIZE + 32, dek + IV_SIZE, 32);
aes_encrypt_cfb_256(session_rc, def, def + IV_SIZE + 32, 32);
r = file_put_data(tf, def, sizeof(def));
} }
uint8_t def[IV_SIZE + 32 + 32 + 32 + 32]; else {
memcpy(def, file_get_data(tf), file_get_size(tf)); r = file_put_data(ef, apdu.data, apdu.nc);
hash_multi(apdu.data, apdu.nc, session_rc); }
memcpy(def + IV_SIZE + 32, dek + IV_SIZE, 32); if (r != PICOKEY_OK) {
aes_encrypt_cfb_256(session_rc, def, def + IV_SIZE + 32, 32); return SW_MEMORY_FAILURE();
r = file_put_data(tf, def, sizeof(def)); }
low_flash_available();
} }
else { else {
r = file_put_data(ef, apdu.data, apdu.nc); delete_file(ef);
} }
if (r != PICOKEY_OK) {
return SW_MEMORY_FAILURE();
}
low_flash_available();
} }
return SW_OK(); return SW_OK();
} }