[Android] Provide the option to use NTLM Authentication

[steveisok]

Unlike our other configurations, there is no library we rely on and can safely ship that provides NTLM authentication. As a result, we will need to incorporate a managed implementation largely based off of @wfurt's work in https://github.com/wfurt/Ntlm.

Work Items

• Port mono's MD4 implementation Port MD4 implementation from mono/mono #62265
• Investigate what needs changed in AndroidMessageHandler and add support for NTLM
• Add support into SocketsHttpHandler

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Issue Details

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Unlike our other configurations, there is no library we rely on and can safely ship that provides NTLM authentication. As a result, we will need to incorporate a managed implementation largely based off of @wfurt's work in https://github.com/wfurt/Ntlm.

Work Items

• Port mono's MD4 implementation
• Investigate what needs changed in AndroidMessageHandler and add support for NTLM
• Add support into SocketsHttpHandler

Author:	steveisok
Assignees:	steveisok, MaximLipnin, wfurt
Labels:	os-android, User Story
Milestone:	7.0.0

[filipnavara]

JFYI I have an open PR on @wfurt's Ntlm repository that implements couple of the missing features and security mechanisms. It should be reviewed/updated/merged before you proceed with integrating the code.

[MaximLipnin]

Hello @wfurt ! Managed MD4 implementation has been added in #62074, so we can move further and try to use it in the AndroidMessageHandler. Since you know a lot in this area, it would be great to get any advice from you or highlight any obstacles on this way.