[#EVP_PKEY_add1_attr_by_txt]
= EVP_PKEY_add1_attr_by_txt
:mrdocs:

Append an X509_ATTRIBUTE named by `attrname` to an EVP_PKEY attribute list.

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_add1_attr_by_txt(
    xref:EVP_PKEY.adoc[EVP_PKEY]* key,
    char const* attrname,
    int type,
    unsigned char const* bytes,
    int len);
----

== Return Value

1 on success, or 0 on failure (including duplicate attributes).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Key whose attribute stack is updated.
| *attrname*
| Short or long attribute name (see obj_mac.h SN_* / LN_*).
| *type*
| ASN.1 value type for the attribute data (V_ASN1_*).
| *bytes*
| Attribute value bytes.
| *len*
| Length of `bytes,` or ‐1 if `bytes` is a NUL‐terminated string when applicable.
|===


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