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ev1 gen session keys

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This commit is contained in:
merlokk 2021-07-31 00:05:39 +03:00
commit dd74ec9523
2 changed files with 30 additions and 0 deletions
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29
client/src/mifare/desfirecrypto.c
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@ -389,6 +389,35 @@ uint8_t DesfireCommModeToFileCommMode(DesfireCommunicationMode comm_mode) {
return fmode;
}
void DesfireGenSessionKeyEV1(const uint8_t rnda[], const uint8_t rndb[], DesfireCryptoAlgorythm keytype, uint8_t *key) {
switch (keytype) {
case T_DES:
memcpy(key, rnda, 4);
memcpy(key + 4, rndb, 4);
break;
case T_3DES:
memcpy(key, rnda, 4);
memcpy(key + 4, rndb, 4);
memcpy(key + 8, rnda + 4, 4);
memcpy(key + 12, rndb + 4, 4);
break;
case T_3K3DES:
memcpy(key, rnda, 4);
memcpy(key + 4, rndb, 4);
memcpy(key + 8, rnda + 6, 4);
memcpy(key + 12, rndb + 6, 4);
memcpy(key + 16, rnda + 12, 4);
memcpy(key + 20, rndb + 12, 4);
break;
case T_AES:
memcpy(key, rnda, 4);
memcpy(key + 4, rndb, 4);
memcpy(key + 8, rnda + 12, 4);
memcpy(key + 12, rndb + 12, 4);
break;
}
}
// https://www.nxp.com/docs/en/application-note/AN12343.pdf
// page 35
void DesfireGenSessionKeyEV2(uint8_t *key, uint8_t *rndA, uint8_t *rndB, bool enckey, uint8_t *sessionkey) {

1
client/src/mifare/desfirecrypto.h
View file

@ -108,6 +108,7 @@ uint8_t DesfireDESKeyGetVersion(uint8_t *key);
DesfireCommunicationMode DesfireFileCommModeToCommMode(uint8_t file_comm_mode);
uint8_t DesfireCommModeToFileCommMode(DesfireCommunicationMode comm_mode);
void DesfireGenSessionKeyEV1(const uint8_t rnda[], const uint8_t rndb[], DesfireCryptoAlgorythm keytype, uint8_t *key);
void DesfireGenSessionKeyEV2(uint8_t *key, uint8_t *rndA, uint8_t *rndB, bool enckey, uint8_t *sessionkey);
void DesfireEV2FillIV(DesfireContext *ctx, bool ivforcommand, uint8_t *iv);