[#OPENSSL_buf2hexstr]
= OPENSSL_buf2hexstr
:mrdocs:

Convert a byte buffer to a newly allocated colon‐separated hex string.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
char*
OPENSSL_buf2hexstr(
    unsigned char const* buf,
    long buflen);
----

== Return Value

Newly allocated string such as "AB:CD", or NULL on error; free with OPENSSL_free.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *buf*
| Bytes to convert.
| *buflen*
| Number of bytes at `buf;` negative treats the buffer as unsigned.
|===


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