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Merge pull request #304 from ViRb3/format-and-docs

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Format and docs
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Iceman 2019-08-03 19:53:49 +02:00 • committed by GitHub
commit f08649ac0e
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1 changed files with 26 additions and 15 deletions
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15
armsrc/hitag2.c
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@ -27,8 +27,11 @@
#include "string.h"
#include "BigBuf.h"
// Successful crypto auth
static bool bCrypto;
// Is in auth stage
static bool bAuthenticating;
// Successful password auth
static bool bPwd;
static bool bSuccessful;
@ -398,6 +401,7 @@ static bool hitag2_password(uint8_t *rx, const size_t rxlen, uint8_t *tx, size_t
// Received UID, tag password
case 32: {
// stage 1, got UID
if (!bPwd) {
bPwd = true;
bAuthenticating = true;
@ -405,6 +409,7 @@ static bool hitag2_password(uint8_t *rx, const size_t rxlen, uint8_t *tx, size_t
*txlen = 32;
}
else {
// stage 2, got config byte+password TAG, discard as will read later
if (bAuthenticating) {
bAuthenticating = false;
if (write) {
@ -414,6 +419,7 @@ static bool hitag2_password(uint8_t *rx, const size_t rxlen, uint8_t *tx, size_t
break;
}
}
// stage 2+, got data block
else {
memcpy(tag.sectors[blocknr], rx, 4);
blocknr++;
@ -493,19 +499,22 @@ static bool hitag2_crypto(uint8_t *rx, const size_t rxlen, uint8_t *tx, size_t *
}
// Received UID, crypto tag answer
case 32: {
// stage 1, got UID
if (!bCrypto) {
uint64_t ui64key = key[0] | ((uint64_t)key[1]) << 8 | ((uint64_t)key[2]) << 16 | ((uint64_t)key[3]) << 24 | ((uint64_t)key[4]) << 32 | ((uint64_t)key[5]) << 40;
uint32_t ui32uid = rx[0] | ((uint32_t)rx[1]) << 8 | ((uint32_t)rx[2]) << 16 | ((uint32_t)rx[3]) << 24;
Dbprintf("hitag2_crypto: key=0x%x%x uid=0x%x", (uint32_t)((REV64(ui64key)) >> 32), (uint32_t)((REV64(ui64key)) & 0xffffffff), REV32(ui32uid));
cipher_state = _hitag2_init(REV64(ui64key), REV32(ui32uid), 0);
// PRN
memset(tx, 0x00, 4);
// Secret data
memset(tx + 4, 0xff, 4);
hitag2_cipher_transcrypt(&cipher_state, tx + 4, 4, 0);
*txlen = 64;
bCrypto = true;
bAuthenticating = true;
} else {
// Check if we received answer tag (at)
// stage 2, got config byte+password TAG, discard as will read later
if (bAuthenticating) {
bAuthenticating = false;
if (write) {
@ -514,7 +523,9 @@ static bool hitag2_crypto(uint8_t *rx, const size_t rxlen, uint8_t *tx, size_t *
}
break;
}
} else {
}
// stage 2+, got data block
else {
// Store the received block
memcpy(tag.sectors[blocknr], rx, 4);
blocknr++;