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Code Issues Releases Activity

Added missing crc functionality and other fixes

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This commit is contained in:
Dan Ware 2020-06-03 14:00:41 +01:00
parent a19d769241
commit f8f69f545f
2 changed files with 66 additions and 8 deletions
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63
source/incognito/incognito.c
View file

@ -96,6 +96,29 @@ LIST_INIT(gpt);
static bool _key_exists(const void *data) { return memcmp(data, zeros, 0x10); };
static void _generate_kek(u32 ks, const void *key_source, void *master_key, const void *kek_seed, const void *key_seed);
unsigned int crc_16_table[16] = {
0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400 };
unsigned short int get_crc_16 (const char *p, int n) {
unsigned short int crc = 0x55AA;
int r;
while (n-- > 0) {
r = crc_16_table[crc & 0xF];
crc = (crc >> 4) & 0x0FFF;
crc = crc ^ r ^ crc_16_table[*p & 0xF];
r = crc_16_table[crc & 0xF];
crc = (crc >> 4) & 0x0FFF;
crc = crc ^ r ^ crc_16_table[(*p >> 4) & 0xF];
p++;
}
return(crc);
}
bool dump_keys()
{
display_backlight_brightness(100, 1000);
@ -307,17 +330,33 @@ bool dump_keys()
return false;
}
char serial[15] = "";
readData((u8 *)serial, 0x250, 14, NULL);
char serial[31] = "";
readData((u8 *)serial, 0x250, 30, NULL);
gfx_printf("%kCurrent serial:%s\n\n", COLOR_BLUE, serial);
gfx_printf("%kCurrent serial: [%s]\n\n", COLOR_BLUE, serial);
// Determine stored crc
u8 *storedCrc = (u8 *)calloc(2, sizeof(u8));
readData((u8 *)storedCrc, 0x250 + 30, 2, NULL);
// Calculate crc
const char *serialBytes = serial;
u16 crcValue = get_crc_16(serialBytes, 30);
u8 crc[2] = { crcValue & 0xff, crcValue >> 8 }; // bytes of u16
// Validate crc
if (memcmp(storedCrc, crc, 0x2) == 0)
gfx_printf("%kValid serial crc\n", COLOR_GREEN);
else
gfx_printf("%kWarning - invalid serial crc\n", COLOR_RED);
free(storedCrc);
return true;
}
bool erase(u32 offset, u32 length)
{
u8 *tmp = (u8 *)calloc(length, sizeof(u8));
bool result = writeData(tmp, offset, length, NULL);
free(tmp);
@ -336,7 +375,21 @@ bool writeSerial()
junkSerial = "XAW00000000001";
}
return writeData((u8 *)junkSerial, 0x250, 14, NULL);
const u32 serialOffset = 0x250;
const u32 serialBlockSize = 0x1E;
if (!writeData((u8 *)junkSerial, serialOffset, 14, NULL))
return false;
// write crc at end of serial-number block
char serial[31] = "";
readData((u8 *)serial, serialOffset, serialBlockSize, NULL);
const char *serialBytes = serial;
u16 crcValue = get_crc_16(serialBytes, serialBlockSize);
u8 crc[2] = { crcValue & 0xff, crcValue >> 8 }; // bytes of u16
return writeData(crc, serialOffset + serialBlockSize, 2, NULL);
}
bool incognito()

11
source/main.c
View file

@ -138,10 +138,12 @@ int sd_save_to_file(void *buf, u32 size, const char *filename)
#define PATCHED_RELOC_ENTRY 0x40010000
#define EXT_PAYLOAD_ADDR 0xC03C0000
#define RCM_PAYLOAD_ADDR (EXT_PAYLOAD_ADDR + ALIGN(PATCHED_RELOC_SZ, 0x10))
#define COREBOOT_ADDR (0xD0000000 - 0x100000)
#define COREBOOT_END_ADDR 0xD0000000
#define CBFS_DRAM_EN_ADDR 0x4003e000
#define CBFS_DRAM_MAGIC 0x4452414D // "DRAM"
static void *coreboot_addr;
void reloc_patcher(u32 payload_dst, u32 payload_src, u32 payload_size)
{
memcpy((u8 *)payload_src, (u8 *)IPL_LOAD_ADDR, PATCHED_RELOC_SZ);
@ -155,7 +157,7 @@ void reloc_patcher(u32 payload_dst, u32 payload_src, u32 payload_size)
if (payload_size == 0x7000)
{
memcpy((u8 *)(payload_src + ALIGN(PATCHED_RELOC_SZ, 0x10)), (u8 *)COREBOOT_ADDR, 0x7000); //Bootblock
memcpy((u8 *)(payload_src + ALIGN(PATCHED_RELOC_SZ, 0x10)), coreboot_addr, 0x7000); //Bootblock
*(vu32 *)CBFS_DRAM_EN_ADDR = CBFS_DRAM_MAGIC;
}
}
@ -185,7 +187,10 @@ int launch_payload(char *path)
if (size < 0x30000)
buf = (void *)RCM_PAYLOAD_ADDR;
else
buf = (void *)COREBOOT_ADDR;
{
coreboot_addr = (void *)(COREBOOT_END_ADDR - size);
buf = coreboot_addr;
}
if (f_read(&fp, buf, size, NULL))
{