[#OSSL_SELF_TEST_oncorrupt_byte]
= OSSL_SELF_TEST_oncorrupt_byte
:mrdocs:

Optionally corrupt the first byte of `bytes` when the callback requests failure injection.

== Synopsis

Declared in `<openssl/self_test.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_SELF_TEST_oncorrupt_byte(
    xref:OSSL_SELF_TEST.adoc[OSSL_SELF_TEST]* st,
    unsigned char* bytes);
----

== Return Value

1 if the first byte was corrupted, or 0 if the buffer was left unchanged.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *st*
| Self‐test object whose callback decides whether to corrupt.
| *bytes*
| Buffer whose first byte may be altered (phase "Corrupt").
|===


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