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add MAC sketch

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This commit is contained in:
merlokk 2021-05-29 20:33:20 +03:00
commit da2a1f3c62
3 changed files with 36 additions and 1 deletions
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4
client/src/cipurse/cipursecore.c
View file

@ -21,6 +21,9 @@
#include "util.h"
#include "cipurse/cipursecrypto.h"
// context for secure channel
CipurseContext cipurseContext;
static int CIPURSEExchangeEx(bool ActivateField, bool LeaveFieldON, sAPDU apdu, bool IncludeLe, uint16_t Le, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
uint8_t data[APDU_RES_LEN] = {0};
@ -84,6 +87,7 @@ static int CIPURSEExchangeEx(bool ActivateField, bool LeaveFieldON, sAPDU apdu,
int CIPURSESelect(bool ActivateField, bool LeaveFieldON, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
uint8_t data[] = {0x41, 0x44, 0x20, 0x46, 0x31};
CipurseCClearContext(&cipurseContext);
return EMVSelect(ECC_CONTACTLESS, ActivateField, LeaveFieldON, data, sizeof(data), Result, MaxResultLen, ResultLen, sw, NULL);
}

25
client/src/cipurse/cipursecrypto.c
View file

@ -184,3 +184,28 @@ void CipurseCAuthenticateHost(CipurseContext *ctx, uint8_t *authdata) {
bool CipurseCCheckCT(CipurseContext *ctx, uint8_t *CT) {
return (memcmp(CT, ctx->CT, CIPURSE_AES_KEY_LENGTH) == 0);
}
void AddISO9797M2Padding(uint8_t *ddata, size_t *ddatalen, uint8_t *sdata, size_t sdatalen, size_t blocklen) {
*ddatalen = sdatalen + 1;
*ddatalen += *ddatalen % blocklen;
memset(ddata, 0, *ddatalen);
memcpy(ddata, sdata, sdatalen);
ddata[sdatalen] = ISO9797_M2_PAD_BYTE;
}
void CipurseCGenerateMAC(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *mac) {
}
void CipurseCCalcMACPadded(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *mac) {
uint8_t pdata[datalen + CIPURSE_AES_KEY_LENGTH];
size_t pdatalen = 0;
AddISO9797M2Padding(pdata, &pdatalen, data, datalen, CIPURSE_AES_KEY_LENGTH);
CipurseCGenerateMAC(ctx, pdata, pdatalen, mac);
}
bool CipurseCCheckMACPadded(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *mac) {
uint8_t xmac[CIPURSE_MAC_LENGTH] = {0};
CipurseCCalcMACPadded(ctx, data, datalen, xmac);
return (memcmp(mac, xmac, CIPURSE_MAC_LENGTH) == 0);
}

8
client/src/cipurse/cipursecrypto.h
View file

@ -16,8 +16,9 @@
#define CIPURSE_KVV_LENGTH 4
#define CIPURSE_AES_KEY_LENGTH 16
#define CIPURSE_SECURITY_PARAM_N 6
#define OSPT_MAC_LENGTH 8
#define CIPURSE_MAC_LENGTH 8
#define CIPURSE_POLY 0x35b088cce172UL
#define ISO9797_M2_PAD_BYTE 0x80
#define member_size(type, member) sizeof(((type *)0)->member)
@ -53,6 +54,11 @@ void CipurseCSetRandomHost(CipurseContext *ctx);
void CipurseCAuthenticateHost(CipurseContext *ctx, uint8_t *authdata);
bool CipurseCCheckCT(CipurseContext *ctx, uint8_t *CT);
void AddISO9797M2Padding(uint8_t *ddata, size_t *ddatalen, uint8_t *sdata, size_t sdatalen, size_t blocklen);
void CipurseCGenerateMAC(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *mac);
void CipurseCCalcMACPadded(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *mac);
bool CipurseCCheckMACPadded(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *mac);
void CipurseCGetKVV(uint8_t *key, uint8_t *kvv);