Wrong NTLMv2 hash when username contains non-ASCI characters

[cdelafuente-r7]

Using usernames with non-ASCII characters breaks NTLMv2 authentication. The ntlmv2_hash method, which generates a NTLMv2 hash, transforms the unicode encoded username to uppercase. This encoding is previously done with EncodeUtil.encode_utf16le. Uppercase operation on such encoded username containing non-ASCII characters generates a wrong NTLMv2 and breaks authentication.

This can be replicated using the ruby_smb's authenticate.rb example script against a Windows system with such users:

> ruby examples/authenticate.rb 10.0.0.68 юзер 123456
SMB3 : (0xc000006d) STATUS_LOGON_FAILURE: The attempted logon is invalid. This is either due to a bad username or authentication information.
Netbios Name: MYWYN2016
Netbios Domain: TESTLAB
FQDN of the computer: mywin2016.testlab.local
FQDN of the domain: testlab.local
FQDN of the forest: testlab.local
Dialect: 0x0311
OS Version: 10.0.14393
SMB2 : (0xc000006d) STATUS_LOGON_FAILURE: The attempted logon is invalid. This is either due to a bad username or authentication information.
Netbios Name: MYWYN2016
Netbios Domain: TESTLAB
FQDN of the computer: mywin2016.testlab.local
FQDN of the domain: testlab.local
FQDN of the forest: testlab.local
Dialect: 0x0210
OS Version: 10.0.14393
SMB1 : (0xc000006d) STATUS_LOGON_FAILURE: The attempted logon is invalid. This is either due to a bad username or authentication information.
Native OS: Windows Server 2016 Standard 14393
Native LAN Manager: Windows Server 2016 Standard 6.3
Netbios Name: MYWYN2016
Netbios Domain: TESTLAB
FQDN of the computer: mywin2016.testlab.local
FQDN of the domain: testlab.local
FQDN of the forest: testlab.local
Dialect: NT LM 0.12
OS Version: 10.0.14393
SMB2 : (0xc000006d) STATUS_LOGON_FAILURE: The attempted logon is invalid. This is either due to a bad username or authentication information.
Netbios Name: MYWYN2016
Netbios Domain: TESTLAB
FQDN of the computer: mywin2016.testlab.local
FQDN of the domain: testlab.local
FQDN of the forest: testlab.local
Dialect: 0x0210
OS Version: 10.0.14393
SMB3 : (0xc000006d) STATUS_LOGON_FAILURE: The attempted logon is invalid. This is either due to a bad username or authentication information.
Netbios Name: MYWYN2016
Netbios Domain: TESTLAB
FQDN of the computer: mywin2016.testlab.local
FQDN of the domain: testlab.local
FQDN of the forest: testlab.local
Dialect: 0x0311
OS Version: 10.0.14393

I've already fixed this and a PR will be submitted soon.