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mic calculation ok

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merlokk 2021-06-02 21:44:32 +03:00
commit 6875ad1b81
2 changed files with 57 additions and 0 deletions
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55
client/src/cipurse/cipursecrypto.c
View file

@ -231,6 +231,61 @@ size_t FindISO9797M2PaddingDataLen(uint8_t *data, size_t datalen) {
return 0; return 0;
} }
/* private fun computeCRC(inputData: ByteArray): Long {
var initialCRC: Long = 0x6363
var ch: Long
for (i in inputData.indices) {
ch = (inputData[i].toInt() and 0xFF).toLong()
ch = ch xor (initialCRC and 0xFF)
ch = ch xor (ch shl 4) and 0xFF
initialCRC =
((initialCRC shr 8 and 0x0FFFF) xor (ch shl 8 and 0x0FFFF) xor (ch shl 3 and 0x0FFFF) xor (ch shr 4 and 0x0FFFF) and 0xFFFF)
}
return initialCRC
}*/
static uint16_t CipurseCComputeMICCRC (uint8_t *data, size_t len) {
uint16_t initCRC = 0x6363;
for (size_t i = 0; i < len; i++) {
uint8_t ch = data[i] ^ initCRC;
ch = ch ^ ((ch << 4) & 0xff);
initCRC = (initCRC >> 8) ^ (ch << 8) ^ (ch << 3) ^ (ch >> 4);
}
return initCRC;
}
void CipurseCGenerateMIC(uint8_t *data, size_t datalen, uint8_t *mic) {
size_t plen = 0;
uint8_t pdata[datalen + CIPURSE_MIC_LENGTH];
memset(pdata, 0, sizeof(pdata));
// 0x00 padding
memcpy(pdata, data, datalen);
plen = datalen;
if (datalen % CIPURSE_MIC_LENGTH)
plen += CIPURSE_MIC_LENGTH - datalen % CIPURSE_MIC_LENGTH;
// crc
uint16_t crc1 = CipurseCComputeMICCRC(pdata, plen);
for (size_t i = 0; i < datalen; i += 4) {
uint8_t tmp1 = pdata[i + 0];
uint8_t tmp2 = pdata[i + 1];
pdata[i + 0] = pdata[i + 2];
pdata[i + 1] = pdata[i + 3];
pdata[i + 2] = tmp1;
pdata[i + 3] = tmp2;
}
uint16_t crc2 = CipurseCComputeMICCRC(pdata, plen);
if (mic != NULL) {
mic[0] = crc2 >> 8;
mic[1] = crc2 & 0xff;
mic[2] = crc1 >> 8;
mic[3] = crc1 & 0xff;
}
}
/* from: https://github.com/duychuongvn/cipurse-card-core/blob/master/src/main/java/com/github/duychuongvn/cirpusecard/core/security/crypto/CipurseCrypto.java#L521 /* from: https://github.com/duychuongvn/cipurse-card-core/blob/master/src/main/java/com/github/duychuongvn/cirpusecard/core/security/crypto/CipurseCrypto.java#L521
* *
* Encrypt/Decrypt the given data using ciphering mechanism explained the OPST. * Encrypt/Decrypt the given data using ciphering mechanism explained the OPST.

2
client/src/cipurse/cipursecrypto.h
View file

@ -18,6 +18,7 @@
#define CIPURSE_AES_KEY_LENGTH 16 #define CIPURSE_AES_KEY_LENGTH 16
#define CIPURSE_SECURITY_PARAM_N 6 #define CIPURSE_SECURITY_PARAM_N 6
#define CIPURSE_MAC_LENGTH 8 #define CIPURSE_MAC_LENGTH 8
#define CIPURSE_MIC_LENGTH 4
#define CIPURSE_POLY 0x35b088cce172UL #define CIPURSE_POLY 0x35b088cce172UL
#define ISO9797_M2_PAD_BYTE 0x80 #define ISO9797_M2_PAD_BYTE 0x80
@ -70,6 +71,7 @@ size_t FindISO9797M2PaddingDataLen(uint8_t *data, size_t datalen);
void CipurseCGenerateMAC(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *mac); 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); 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); bool CipurseCCheckMACPadded(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *mac);
void CipurseCGenerateMIC(uint8_t *data, size_t datalen, uint8_t *mic);
void CipurseCEncryptDecrypt(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *dstdata, bool isEncrypt); void CipurseCEncryptDecrypt(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *dstdata, bool isEncrypt);
void CipurseCChannelEncrypt(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *encdata, size_t *encdatalen); void CipurseCChannelEncrypt(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *encdata, size_t *encdatalen);
void CipurseCChannelDecrypt(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *plaindata, size_t *plaindatalen); void CipurseCChannelDecrypt(CipurseContext *ctx, uint8_t *data, size_t datalen, uint8_t *plaindata, size_t *plaindatalen);