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Better protection. 

git-svn-id: https://svn.code.sf.net/p/vbam/code/trunk@518 a31d4220-a93d-0410-bf67-fe4944624d44
This commit is contained in:
n-a-c-h 2008-05-20 03:39:14 +00:00
parent 87fbce804c
commit 596778f3f2
1 changed files with 5 additions and 7 deletions
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12
src/win32/protect.c
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@ -81,14 +81,12 @@ int ExecutableValid(const char *executable_filename)
crc1 = crc32(crc1, (const Bytef *)buffer, length_till_data);
crc2 = crc32(crc1, (const Bytef *)data, sizeof(data));
crc3 = crc32(crc3, (const Bytef *)p+sizeof(data), file_size-(length_till_data+sizeof(data)));
crc4 = crc32(crc4, (const Bytef *)(data+1), sizeof(data)-sizeof(uint32_t));
data[sizeof(data)/sizeof(uint32_t)-1] += sizeof(data); //Seriously "what the heck", right? ;-)
crc4 = crc32(crc4, (const Bytef *)(data+2), sizeof(data)-sizeof(uint32_t)*2);
if ((crc1 == data[sizeof(data)/sizeof(uint32_t)-4]) &&
(crc3 == data[sizeof(data)/sizeof(uint32_t)-3]) &&
(crc4 == data[1]) &&
(crc32_combine(crc2, crc3, file_size-(length_till_data+sizeof(data))) == data[sizeof(data)/sizeof(uint32_t)-2]) &&
if ((data[sizeof(data)/sizeof(uint32_t)-4] == crc1) &&
(data[sizeof(data)/sizeof(uint32_t)-3] == crc3) &&
(data[sizeof(data)/sizeof(uint32_t)-2] == crc32_combine(crc2, crc3, file_size-(length_till_data+sizeof(data)))) &&
(data[sizeof(data)/sizeof(uint32_t)-1] == crc4) &&
(file_size == data[2]) &&
(data[3] == ((uint32_t *)(buffer+file_size))[-2]) &&
(data[4] == ((uint32_t *)(buffer+file_size))[-1]))