[#OPENSSL_hexchar2int]
= OPENSSL_hexchar2int
:mrdocs:

Convert a single hexadecimal digit character to its 0–15 value.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OPENSSL_hexchar2int(unsigned char c);
----

== Return Value

Nibble value 0–15, or ‐1 if `c` is not a hex digit.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *c*
| ASCII hex digit ('0'–'9', 'a'–'f', or 'A'–'F').
|===


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