[#SHA256]
= SHA256
:mrdocs:

Compute the SHA‐256 digest of `n` bytes at `d` in one shot.

== Synopsis

Declared in `<openssl/sha.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
unsigned char*
SHA256(
    unsigned char const* d,
    size_t n,
    unsigned char* md);
----

== Return Value

Pointer to the digest bytes, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *d*
| Input message bytes.
| *n*
| Number of bytes at `d.`
| *md*
| Output buffer of at least SHA256_DIGEST_LENGTH bytes, or NULL for a static buffer (not thread‐safe).
|===


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