Cng Key Agreement

I spent a few days researching which ecDH structure has a secret agreement, but no success. I discovered in MSDN that the NCryptSecretAgreement function puts a pointer on a variable NCRYPT_SECRET_HANDLE that receives a handle that represents the value of secret chords. I don`t know WinAPI at all, so I can`t do anything but read documents. Unlike the Cryptography API (CryptoAPI), the Next Generation Cryptography API (GNC) separates cryptographic providers from key storage providers (KSPs). KSPs can be used to create, delete, export, import, open, and save keys. Depending on the implementation, they can also be used for asymmetric encryption, secret agreement, and signing. Microsoft installs the following KSPs from Windows Vista and Windows Server 2008. Providers can create and install other providers. I need to exchange keys between a Windows-based desktop app and a web app. What I need to know is exactly how GNC`s KDF uses the value of the secret chord (in my case hashes). I use the SHA-256 algorithm as KDF and try to get X and Y from the secret agreement, but the result does not match what the CNG calculates.

Any ideas? An important feature of CNG is support for suite B algorithms. In February 2005, the U.S. National Security Agency (NSA) announced a coordinated set of symmetric encryption, asymmetric secrecy agreement (also known as key exchange), digital signature, and hash features for future use by the U.S. government called Suite B. The NSA has announced that B-suite certified implementations can and will be used to protect classified top-secret, secret, and private information that has been described in the past as sensitive but unclassified. In this context, support for Suite B is very important for both application software vendors and system integrators and Microsoft. This seminar discusses next-generation cryptography (CNG) support in Windows Vista through Windows 8 and Windows Server 2012. CNG is available for the first time on Windows Vista and is intended to replace existing uses of CryptoAPI throughout Microsoft`s software stack. Third-party developers find a lot of new features in GNC, including: All functions that simultaneously change the same storage area (critical sections) when called by separate threads are not thread-resistant.

One of the main value promises of CNG is cryptographic agility, sometimes referred to as cryptographic agnosticism. However, converting the implementation of protocols such as Secure Sockets Layer Protocol (SSL) or Transport Layer Security (TLS), CMS (S/MIME), IPsec, Kerberos, etc. to CNG was necessary to make this capability valuable. At the CNG level, it was necessary to provide substitutions and detection capabilities for all types of algorithms (symmetric, asymmetric, hash functions), random generation and other utility functions. Protocol-level changes are more important because, in many cases, protocol APIs are needed to add algorithm selection and other flexibility options that did not exist before. Supports software key creation and storage and the following algorithms. CNG meets the requirements of common Criteria by storing and using durable keys in a secure process. application programmer; security personnel; Responsible management of security policies and implementation This seminar provides application developers and designers with all the information they need to successfully configure, use, and extend CNG interfaces.

The seminar will also be useful to those who are responsible for developing and maintaining an organization`s security policy or application design. Cryptographic concepts and decision points are presented and discussed. The laboratory version of this seminar contains a series of programming exercises that illustrate and reinforce the principles presented in the “Using CNG” section. . . .