FIX: Coverity scans, uninitialized variables,

[proxmark3-svn] / armsrc / mifareutil.c

diff --git a/armsrc/mifareutil.c b/armsrc/mifareutil.c
index 84477a2b046c29da292e3a8675da213c639c4324..1bc5454552aaf58d6bf5580426ce78520979be0a 100644 (file)
--- a/armsrc/mifareutil.c
+++ b/armsrc/mifareutil.c
@@ -32,10 +32,10 @@ void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len){
                for (i = 0; i < len; i++)\r
                        data[i] = crypto1_byte(pcs, 0x00, 0) ^ data[i];\r
        } else {\r
-               bt = 0;\r
-               for (i = 0; i < 4; i++)\r
-                       bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data[0], i)) << i;\r
-                               \r
+               bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data[0], 0)) << 0;\r
+               bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data[0], 1)) << 1;\r
+               bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data[0], 2)) << 2;\r
+               bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data[0], 3)) << 3;\r
                data[0] = bt;\r
        }\r
        return;\r
@@ -49,20 +49,18 @@ void mf_crypto1_encrypt(struct Crypto1State *pcs, uint8_t *data, uint16_t len, u
        for (i = 0; i < len; i++) {\r
                bt = data[i];\r
                data[i] = crypto1_byte(pcs, 0x00, 0) ^ data[i];\r
-               if((i&0x0007) == 0) \r
+               if ((i&0x0007) == 0) \r
                        par[i>>3] = 0;\r
                par[i>>3] |= (((filter(pcs->odd) ^ oddparity8(bt)) & 0x01)<<(7-(i&0x0007)));\r
        }       \r
-       return;\r
 }\r
 \r
 uint8_t mf_crypto1_encrypt4bit(struct Crypto1State *pcs, uint8_t data) {\r
        uint8_t bt = 0;\r
-       int i;\r
-\r
-       for (i = 0; i < 4; i++)\r
-               bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data, i)) << i;\r
-               \r
+       bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data, 0)) << 0;\r
+       bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data, 1)) << 1;\r
+       bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data, 2)) << 2;\r
+       bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data, 3)) << 3;\r
        return bt;\r
 }\r
 \r
@@ -78,7 +76,6 @@ int mifare_sendcmd(uint8_t cmd, uint8_t* data, uint8_t data_size, uint8_t* answe
        if(!len) {\r
                if (MF_DBGLEVEL >= MF_DBG_ERROR)   Dbprintf("%02X Cmd failed. Card timeout.", cmd);\r
                        len = ReaderReceive(answer,answer_parity);\r
-               //return 0;\r
     }\r
        return len;\r
 }\r
@@ -86,9 +83,10 @@ int mifare_sendcmd(uint8_t cmd, uint8_t* data, uint8_t data_size, uint8_t* answe
 // send 2 byte commands\r
 int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t *answer, uint8_t *answer_parity, uint32_t *timing)\r
 {\r
-       uint8_t dcmd[4], ecmd[4];\r
+       uint8_t dcmd[4] = {0x00};\r
+       uint8_t ecmd[4] = {0x00};\r
        uint16_t pos, res;\r
-       uint8_t par[1];                 // 1 Byte parity is enough here\r
+       uint8_t par[1] = {0x00};                        // 1 Byte parity is enough here\r
        dcmd[0] = cmd;\r
        dcmd[1] = data;\r
        AppendCrc14443a(dcmd, 2);\r
@@ -97,8 +95,7 @@ int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd,
        \r
        if (crypted) {\r
                par[0] = 0;\r
-               for (pos = 0; pos < 4; pos++)\r
-               {\r
+               for (pos = 0; pos < 4; pos++) {\r
                        ecmd[pos] = crypto1_byte(pcs, 0x00, 0) ^ dcmd[pos];\r
                        par[0] |= (((filter(pcs->odd) ^ oddparity8(dcmd[pos])) & 0x01) << (7-pos));\r
                }       \r
@@ -116,16 +113,15 @@ int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd,
        if (crypted == CRYPT_ALL) {\r
                if (len == 1) {\r
                        res = 0;\r
-                       for (pos = 0; pos < 4; pos++)\r
-                               res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], pos)) << pos;\r
-                               \r
+                       res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], 0)) << 0;\r
+                       res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], 1)) << 1;\r
+                       res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], 2)) << 2;\r
+                       res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], 3)) << 3;\r
                        answer[0] = res;\r
                        \r
                } else {\r
                        for (pos = 0; pos < len; pos++)\r
-                       {\r
                                answer[pos] = crypto1_byte(pcs, 0x00, 0) ^ answer[pos];\r
-                       }\r
                }\r
        }\r
        \r
@@ -143,7 +139,7 @@ int mifare_classic_authex(struct Crypto1State *pcs, uint32_t uid, uint8_t blockN
        // variables\r
        int len;        \r
        uint32_t pos;\r
-       uint8_t tmp4[4];\r
+       uint8_t tmp4[4] = {0x00};\r
        uint8_t par[1] = {0x00};\r
 \r
        // "random" reader nonce:\r
@@ -232,10 +228,10 @@ int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blo
 {\r
        // variables\r
        int len;        \r
-       uint8_t bt[2];\r
+       uint8_t bt[2] = {0x00};\r
        \r
-       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];\r
-       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];\r
+       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE] = {0x00};\r
+       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE] = {0x00};\r
        \r
        // command MIFARE_CLASSIC_READBLOCK\r
        len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer, receivedAnswerPar, NULL);\r
@@ -263,13 +259,14 @@ int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blo
 int mifare_ul_ev1_auth(uint8_t *keybytes, uint8_t *pack){\r
 \r
        uint16_t len;\r
-       uint8_t resp[4];\r
-       uint8_t respPar[1];\r
+       uint8_t resp[4] = {0x00};\r
+       uint8_t respPar[1] = {0x00};\r
        uint8_t key[4] = {0x00};\r
        memcpy(key, keybytes, 4);\r
 \r
        if (MF_DBGLEVEL >= MF_DBG_EXTENDED)\r
                Dbprintf("EV1 Auth : %02x%02x%02x%02x", key[0], key[1], key[2], key[3]);\r
+       \r
        len = mifare_sendcmd(0x1B, key, sizeof(key), resp, respPar, NULL);\r
 \r
        if (len != 4) {\r
@@ -374,10 +371,9 @@ int mifare_ultra_readblock(uint8_t blockNo, uint8_t *blockData)
 {\r
        uint16_t len;\r
        uint8_t bt[2];\r
-       uint8_t receivedAnswer[MAX_FRAME_SIZE];\r
-       uint8_t receivedAnswerPar[MAX_PARITY_SIZE];\r
+       uint8_t receivedAnswer[MAX_FRAME_SIZE] = {0x00};\r
+       uint8_t receivedAnswerPar[MAX_PARITY_SIZE] = {0x00};\r
        \r
-\r
        len = mifare_sendcmd_short(NULL, 1, 0x30, blockNo, receivedAnswer, receivedAnswerPar, NULL);\r
        if (len == 1) {\r
                if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("Cmd Error: %02x", receivedAnswer[0]);\r
@@ -408,8 +404,8 @@ int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t bl
        byte_t res = 0;\r
        \r
        uint8_t d_block[18], d_block_enc[18];\r
-       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];\r
-       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];\r
+       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE] = {0x00};\r
+       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE] = {0x00};\r
        \r
        // command MIFARE_CLASSIC_WRITEBLOCK\r
        len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer, receivedAnswerPar, NULL);\r
@@ -483,8 +479,8 @@ int mifare_ultra_writeblock(uint8_t blockNo, uint8_t *blockData)
 {\r
     uint16_t len;\r
        uint8_t d_block[5] = {0x00};\r
-       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];\r
-       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];\r
+       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE] = {0x00};\r
+       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE] = {0x00};\r
 \r
     // command MIFARE_CLASSIC_WRITEBLOCK\r
        d_block[0]= blockNo;\r
@@ -502,8 +498,8 @@ int mifare_ultra_writeblock(uint8_t blockNo, uint8_t *blockData)
 }\r
 int mifare_classic_halt_ex(struct Crypto1State *pcs) {\r
        uint16_t len;   \r
-       uint8_t receivedAnswer[4];\r
-       uint8_t receivedAnswerPar[4];\r
+       uint8_t receivedAnswer[4] = {0x00};\r
+       uint8_t receivedAnswerPar[4] = {0x00};\r
 \r
        len = mifare_sendcmd_short(pcs, pcs == NULL ? false:true, 0x50, 0x00, receivedAnswer, receivedAnswerPar, NULL);\r
        if (len != 0) {\r
@@ -519,8 +515,8 @@ int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid) {
 int mifare_ultra_halt()\r
 {\r
        uint16_t len;\r
-       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];\r
-       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];\r
+       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE] = {0x00};\r
+       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE] = {0x00};\r
     \r
        len = mifare_sendcmd_short(NULL, true, 0x50, 0x00, receivedAnswer, receivedAnswerPar, NULL);\r
        if (len != 0) {\r
@@ -538,8 +534,7 @@ uint8_t NumBlocksPerSector(uint8_t sectorNo)
 {\r
        if (sectorNo < 32) \r
                return 4;\r
-       else\r
-               return 16;\r
+       return 16;\r
 }\r
 \r
 uint8_t FirstBlockOfSector(uint8_t sectorNo) \r
@@ -591,9 +586,8 @@ int emlGetValBl(uint32_t *blReg, uint8_t *blBlock, int blockNum) {
        uint8_t* emCARD = BigBuf_get_EM_addr();\r
        uint8_t* data = emCARD + blockNum * 16;\r
        \r
-       if (emlCheckValBl(blockNum)) {\r
+       if (emlCheckValBl(blockNum))\r
                return 1;\r
-       }\r
        \r
        memcpy(blReg, data, 4);\r
        *blBlock = data[12];\r
@@ -618,7 +612,7 @@ int emlSetValBl(uint32_t blReg, uint8_t blBlock, int blockNum) {
 }\r
 \r
 uint64_t emlGetKey(int sectorNum, int keyType) {\r
-       uint8_t key[6];\r
+       uint8_t key[6] = {0x00};\r
        uint8_t* emCARD = BigBuf_get_EM_addr();\r
        \r
        memcpy(key, emCARD + 16 * (FirstBlockOfSector(sectorNum) + NumBlocksPerSector(sectorNum) - 1) + keyType * 10, 6);\r
@@ -685,8 +679,8 @@ int mifare_desfire_des_auth1(uint32_t uid, uint8_t *blockData){
        int len;\r
        // load key, keynumber\r
        uint8_t data[2]={0x0a, 0x00};\r
-       uint8_t receivedAnswer[MAX_FRAME_SIZE];\r
-       uint8_t receivedAnswerPar[MAX_PARITY_SIZE];\r
+       uint8_t receivedAnswer[MAX_FRAME_SIZE] = {0x00};\r
+       uint8_t receivedAnswerPar[MAX_PARITY_SIZE] = {0x00};\r
        \r
        len = mifare_sendcmd_special(NULL, 1, 0x02, data, receivedAnswer,receivedAnswerPar,NULL);\r
        if (len == 1) {\r
@@ -715,8 +709,8 @@ int mifare_desfire_des_auth2(uint32_t uid, uint8_t *key, uint8_t *blockData){
        data[0] = 0xAF;\r
        memcpy(data+1,key,16);\r
        \r
-       uint8_t receivedAnswer[MAX_FRAME_SIZE];\r
-       uint8_t receivedAnswerPar[MAX_PARITY_SIZE];\r
+       uint8_t receivedAnswer[MAX_FRAME_SIZE] = {0x00};\r
+       uint8_t receivedAnswerPar[MAX_PARITY_SIZE] = {0x00};\r
        \r
        len = mifare_sendcmd_special2(NULL, 1, 0x03, data, receivedAnswer, receivedAnswerPar ,NULL);\r
        \r