[#OPENSSL_hexstr2buf]
= OPENSSL_hexstr2buf
:mrdocs:

Decode a hexadecimal string into a newly allocated byte buffer.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
unsigned char*
OPENSSL_hexstr2buf(
    char const* str,
    long* buflen);
----

== Return Value

Allocated buffer with decoded bytes, or NULL on error; free with OPENSSL_free().

== Parameters

[cols="1,4"]
|===
| Name| Description
| *str*
| NUL‐terminated hex text (optional ':' separators between octets).
| *buflen*
| Receives the number of decoded bytes, or may be NULL.
|===


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