nerotj.blogg.se - Ntlm hash calculator

#Ntlm hash calculator 64 bits#
#Ntlm hash calculator code#
#Ntlm hash calculator password#

This makes such hashes crackable in a matter of seconds using rainbow tables, or in a few minutes using brute force. Although it is based on DES, a well-studied block cipher, the LM hash has several weaknesses in its design.

#Ntlm hash calculator password#

LAN Manager authentication uses a particularly weak method of hashing a user's password known as the LM hash algorithm, stemming from the mid 1980s when viruses transmitted by floppy disks were the major concern.

These two ciphertext values are concatenated to form a 16-byte value, which is the LM hash.

The DES CipherMode should be set to ECB, and PaddingMode should be set to NONE.

Each of the two keys is used to DES-encrypt the constant ASCII string “ resulting in two 8-byte ciphertext values.

The parity bits added in this step are later discarded.)

#Ntlm hash calculator 64 bits#

(A DES key ostensibly consists of 64 bits however, only 56 of these are actually used by the algorithm. This generates the 64 bits needed for a DES key.

These values are used to create two DES keys, one from each 7-byte half, by converting the seven bytes into a bit stream with the most significant bit first, and inserting a parity bit after every seven bits (so 1010100 becomes 10101000).

The “fixed-length” password is split into two 7-byte halves.

This password is NULL-padded to 14 bytes.

#Ntlm hash calculator code#

The user's password is encoded in the System OEM code page.

The user’s password is converted to uppercase.

The user's password is restricted to a maximum of fourteen characters.

Many vendors shipped licensed versions, including:

1987 – MS LAN Manager 1.0 (Basic/Enhanced).

The last version of LAN Manager, 2.2, which included an MS-OS/2 1.31 base operating system, remained Microsoft's strategic server system until the release of Windows NT Advanced Server in 1993. In 1990, Microsoft announced LAN Manager 2.0 with a host of improvements, including support for TCP/IP as a transport protocol for SMB, using NetBIOS over TCP/IP (NBT).

A version of LAN Manager for Unix-based systems called LAN Manager/X was also available.

These legacy protocols had been inherited from previous products such as MS-Net for MS-DOS, Xenix-NET for MS-Xenix, and the afore-mentioned 3+Share. It originally used SMB atop either the NetBIOS Frames (NBF) protocol or a specialized version of the Xerox Network Systems (XNS) protocol. As I didn't needed it, I just left it as is, but any pull requests would be welcome.The LAN Manager OS/2 operating system was co-developed by IBM and Microsoft, using the Server Message Block (SMB) protocol. Which means NTLM is already predefined at this stage. It really seems that when the system is going through the SSPI route it doesn't care about what is the "type" it uses.Īnyway, as I wrote in the commit messages, to allow other SSPI handles (called "security support providers" and which you can get through EnumerateSecurityPackages WinAPI function as per msdn) - I need to change the way how the header name is generated, because I just went a kind of "easy way", just patching inside the ntlm_request/ntlm_response functions. Originally I created the SSPI version to pierce through my corporate firewall too, it was using Negotiate but worked with NTLM just fine too (Negotiate was actually used by the browser as the research showed). Actually for me it seemed that the NTLM hash using SSPI was not exactly an NTLM hash at all, they just probably called it the same for backwards compability or stuff like that.