Problem - Kevin Tafuro

CryptReleaseContext(hProvider, 0);
return FALSE;
}
}
for (dwPass = 0; dwPass < sizeof(pbSinglePats); dwPass++) {
memset(pbBuffer, pbSinglePats[dwPass], sizeof(pbBuffer));
if (!PatternPass(hFile, pbBuffer, sizeof(pbBuffer), dwFileSize)) {
CryptReleaseContext(hProvider, 0);
return FALSE;
}
}
for (dwPass = 0; dwPass < sizeof(pbTriplePats) / cbPattern; dwPass++) {
dwCount = sizeof(pbBuffer) / cbPattern;
for (dwIndex = 0; dwIndex < dwCount; dwIndex++)
CopyMemory(pbBuffer + (dwIndex * cbPattern), pbTriplePats[dwPass],
cbPattern);
if (!PatternPass(hFile, pbBuffer, cbPattern * dwCount, dwFileSize)) {
CryptReleaseContext(hProvider, 0);
return FALSE;
}
}
for (dwPass = 0; dwPass < 4; dwPass++)
if (!RandomPass(hFile, hProvider, dwFileSize)) {
CryptReleaseContext(hProvider, 0);
return FALSE;
}
CryptReleaseContext(hProvider, 0);
return TRUE;
}
See Also
“Secure Deletion of Data from Magnetic and Solid-State Memory” by Peter Gutmann:
http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html
2.6 Accessing File Information Securely
Problem
You need to access information about a file, such as its size or last modification date.
In doing so, you want to avoid the possibility of race conditions.
Solution
Use a secure directory, as described in Recipe 2.4. Alternatively, open the file and
query the needed information using the file handle. Do not use functions that oper-
Accessing File Information Securely | 53
This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.