[#SHA1_Transform]
= SHA1_Transform
:mrdocs:

Process one SHA‐1 compression round on a full 64‐byte block (deprecated).

== Synopsis

Declared in `<openssl/sha.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
void
SHA1_Transform(
    xref:SHA_CTX.adoc[SHA_CTX]* c,
    unsigned char const* data);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *c*
| SHA‐1 context whose chaining variables are updated.
| *data*
| Pointer to SHA_CBLOCK input bytes.
|===


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