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add ntfs_security_hash(): hash of a security descriptor (Anton Altaparmakov)

master
szaka 2007-09-02 12:38:29 +00:00
parent 921457fd65
commit c9172f66cf
2 changed files with 31 additions and 0 deletions
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3
include/ntfs-3g/security.h
View File

@ -55,4 +55,7 @@ extern char *ntfs_sid_to_mbs(const SID *sid, char *sid_str,
extern void ntfs_generate_guid(GUID *guid);
extern int ntfs_sd_add_everyone(ntfs_inode *ni);
extern le32 ntfs_security_hash(const SECURITY_DESCRIPTOR_RELATIVE *sd,
const u32 len);
#endif /* defined _NTFS_SECURITY_H */

28
libntfs-3g/security.c
View File

@ -43,6 +43,7 @@
#include "attrib.h"
#include "security.h"
#include "misc.h"
#include "bitmap.h"
/*
* The zero GUID.
@ -338,3 +339,30 @@ int ntfs_sd_add_everyone(ntfs_inode *ni)
return ret;
}
/**
* ntfs_security_hash - calculate the hash of a security descriptor
* @sd: self-relative security descriptor whose hash to calculate
* @length: size in bytes of the security descritor @sd
*
* Calculate the hash of the self-relative security descriptor @sd of length
* @length bytes.
*
* This hash is used in the $Secure system file as the primary key for the $SDH
* index and is also stored in the header of each security descriptor in the
* $SDS data stream as well as in the index data of both the $SII and $SDH
* indexes. In all three cases it forms part of the SDS_ENTRY_HEADER
* structure.
*
* Return the calculated security hash in little endian.
*/
le32 ntfs_security_hash(const SECURITY_DESCRIPTOR_RELATIVE *sd, const u32 len)
{
const le32 *pos = (le32 *)sd;
const le32 *end = pos + (len >> 2);
u32 hash = 0;
while (pos < end)
hash = le32_to_cpup(pos++) + ntfs_rol32(hash, 3);
return cpu_to_le32(hash);
}