![]() ![]() ECDSAĮCDSA (Elliptic Curve Digital Signature Algorithm) key generation is done by the OS libraries and is subject to their size limitations and performance characteristics.ĮCDSA key curves are defined by the OS libraries and are subject to their limitations. If an appropriate library can't be found, exceptions will be thrown. In that case, any method that requires OS interop, such as opening a named key, throws a PlatformNotSupportedException.Ģ On macOS, RSAOpenSsl works if OpenSSL is installed and an appropriate libcrypto dylib can be found via dynamic library loading. Typeġ On macOS and Linux, RSACryptoServiceProvider can be used for compatibility with existing programs. The types involved do not translate between platforms, and should only be directly used when necessary. NET exposes types to allow programs to interoperate with the OS libraries that the. ![]() The preferred provider is an implementation detail and is subject to change. The GetRSAPrivateKey extension method for X509Certificate2 currently prefers an RSACng instance, but if RSACng can't open the key, RSACryptoServiceProvider will be attempted.This use of RSACng is an implementation detail and is subject to change. The GetRSAPublicKey extension method for X509Certificate2 returns an RSACng instance.This use of Windows CNG is an implementation detail and is subject to change. The object returned by RSA.Create is internally powered by Windows CNG.Windows Cryptography API Next Generation (CNG) is used whenever new RSACng() is used.Windows CryptoAPI (CAPI) is used whenever new RSACryptoServiceProvider() is used.But the individual RSA object may be loaded in a cryptographic service provider (CSP) that doesn't support it. * Windows CryptoAPI (CAPI) is capable of PKCS1 signature with a SHA-2 algorithm. Not all platforms support the same padding options: Padding Mode The OS libraries are used for encryption and decryption padding. NET does not expose "raw" (unpadded) RSA operations. ![]() RSA key operations are performed by the OS libraries, and the types of key that can be loaded are subject to OS requirements. RSA (Rivest–Shamir–Adleman) key generation is performed by the OS libraries and is subject to their size limitations and performance characteristics. This section includes the following subsections: The AesGcm class supports only 96-bit (12-byte) nonces. AES-CCM keys, nonces, and tagsĪES-CCM works with 128, 192, and 256-bit keys. The libcrypto.35.dylib, libcrypto.41.dylib, and libcrypto.42.dylib libraries are from LibreSSL and will not be used. The libcrypto.0.9.7.dylib and libcrypto.0.9.8.dylib libraries included in macOS are from earlier versions of OpenSSL and will not be used. We recommend that you install OpenSSL from a package manager such as Homebrew. Users on macOS need to obtain an appropriate copy of OpenSSL (libcrypto) for these types to function, and it must be in a path that the system would load a library from by default. ![]() On macOS, the system libraries don't support AES-CCM or AES-GCM for third-party code, so the AesCcm and AesGcm classes use OpenSSL for support. On Windows and Linux, the implementations of AES-CCM and AES-GCM are provided by the OS libraries. Cipher + ModeĪuthenticated encryption (AE) support is provided for AES-CCM and AES-GCM via the and classes. The underlying ciphers and chaining are done by the system libraries, and all are supported by all platforms. While the various OS libraries differ in performance, they should be compatible. Hash algorithmsĪll hash algorithm and hash-based message authentication (HMAC) classes, including the *Managed classes, defer to the OS libraries. This article assumes you have a working familiarity with cryptography in. This article identifies the features that are supported on each platform. NET supports can't be used on some platforms. While all platforms support certain core features, some features that. NET apps can only use cryptographic features that the OS supports. The dependency on OS libraries also means that. NET apps have access to FIPS-validated algorithms if the OS libraries are FIPS-validated. To do that, they provide updates that system administrators should be applying. Keeping cryptography libraries safe from vulnerabilities is a high priority for OS vendors. NET 5+ are done by operating system (OS) libraries. ![]()
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