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fix crc search with padding

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merlokk 2021-07-27 18:28:41 +03:00
parent 4c743d4772
commit 0b6546012a
1 changed files with 2 additions and 1 deletions
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3
client/src/mifare/desfirecrypto.c
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@ -124,7 +124,8 @@ size_t DesfireSearchCRCPos(uint8_t *data, size_t datalen, uint8_t respcode, uint
uint8_t crcdata[1024] = {0};
size_t crcposfound = 0;
for (int i = 0; i < crclen + 1; i++) {
// crc may be 00..00 and at the end of file may be padding 0x80. so we search from last zero to crclen + 2 (one for crc=0 and one for padding 0x80)
for (int i = 0; i < crclen + 2; i++) {
if (crcpos - i == 0)
break;
if (crcpos - i + crclen > datalen)