[#OPENSSL_hexstr2buf_ex]
= OPENSSL_hexstr2buf_ex
:mrdocs:

Decode a hex string into `buf,` optionally ignoring separator `sep.`

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OPENSSL_hexstr2buf_ex(
    unsigned char* buf,
    size_t buf_n,
    size_t* buflen,
    char const* str,
    char const sep);
----

== Return Value

1 on success, or 0 on failure (invalid input or insufficient `buf_n).`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *buf*
| Destination byte buffer, or NULL to only compute the required length.
| *buf_n*
| Capacity of `buf` in bytes (ignored when `buf` is NULL).
| *buflen*
| Receives the number of decoded bytes, or may be NULL.
| *str*
| NUL‐terminated hex text (may contain `sep` between octets).
| *sep*
| Optional separator character to skip (for example ':'), or '0' for none.
|===


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