[#sha256_implementation-UseImplementation]
= xref:sha256_implementation.adoc[sha256_implementation]::UseImplementation
:relfileprefix: ../
:mrdocs:

Bit flags selecting which CPU‐specific SHA‐256 implementations may be used.

== Synopsis

Declared in `<crypto/sha256.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
enum UseImplementation : uint8_t;
----

== Members

[cols="1,4"]
|===
| Name| Description
| `STANDARD` 
| Portable C++ implementation only.
| `USE_SSE4` 
| Allow the SSE4‐accelerated implementation.
| `USE_AVX2` 
| Allow the AVX2‐accelerated implementation.
| `USE_SHANI` 
| Allow the SHA‐NI‐accelerated implementation.
| `USE_SSE4_AND_AVX2` 
| Allow both SSE4 and AVX2.
| `USE_SSE4_AND_SHANI` 
| Allow both SSE4 and SHA‐NI.
| `USE_ALL` 
| Allow every accelerated implementation.
|===


== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:SHA256AutoDetect.adoc[`::SHA256AutoDetect`]
| Autodetect the best available SHA256 implementation. Returns the name of the implementation.
|===


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