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add mac sketch

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merlokk 2021-05-29 20:56:55 +03:00
commit 413c5ec340
1 changed files with 26 additions and 1 deletions
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27
client/src/cipurse/cipursecrypto.c
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@ -13,6 +13,7 @@
#include "commonutil.h" // ARRAYLEN
#include "comms.h" // DropField
#include "util_posix.h" // msleep
#include <string.h> // memcpy memset
#include "cmdhf14a.h"
#include "emv/emvcore.h"
@ -193,8 +194,32 @@ void AddISO9797M2Padding(uint8_t *ddata, size_t *ddatalen, uint8_t *sdata, size_
ddata[sdatalen] = ISO9797_M2_PAD_BYTE;
}
/* from: https://github.com/duychuongvn/cipurse-card-core/blob/master/src/main/java/com/github/duychuongvn/cirpusecard/core/security/crypto/CipurseCrypto.java#L473
*
* Generate OSPT MAC on the given input data.
* Data should be already padded.
*
* Calculation of Mi and ki+1: hx := ki , hx+1 := AES( key = hx ; Dx )
* XOR Dx , hx+2 := AES( key = hx+1 ; Dx+1 ) XOR Dx+1, hx+3 := AES( key =
* hx+2 ; Dx+2 ) XOR Dx+2, ... hy+1 := AES( key = hy ; Dy ) XOR Dy, ki+1 :=
* hy+1 M'i := AES( key = ki ; ki+1 ) XOR ki+1, Mi := m LS bits of M'i = (
* (M'i )0, (M'i )1, ..., (M'i )m-1)
*/
void CipurseCGenerateMAC(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *mac) {
uint8_t temp[CIPURSE_AES_KEY_LENGTH] = {0};
memcpy(ctx->frameKeyNext, ctx->frameKey, CIPURSE_AES_KEY_LENGTH);
int i = 0;
while (datalen > i) {
aes_encode(NULL, ctx->frameKeyNext, &data[i], temp, CIPURSE_AES_KEY_LENGTH);
bin_xor(temp, &data[i], CIPURSE_AES_KEY_LENGTH);
memcpy(ctx->frameKeyNext, temp, CIPURSE_AES_KEY_LENGTH);
i += CIPURSE_AES_KEY_LENGTH;
}
aes_encode(NULL, ctx->frameKey, ctx->frameKeyNext, temp, CIPURSE_AES_KEY_LENGTH);
bin_xor(temp, ctx->frameKeyNext, CIPURSE_AES_KEY_LENGTH);
memcpy(mac, temp, CIPURSE_MAC_LENGTH);
}
void CipurseCCalcMACPadded(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *mac) {