[#EVP_PKEY_CTX_set0_rsa_oaep_label]
= EVP_PKEY_CTX_set0_rsa_oaep_label
:mrdocs:

Set the RSA‐OAEP label on an EVP_PKEY_CTX, transferring ownership of `label.`

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set0_rsa_oaep_label(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    void* label,
    int llen);
----

== Description

The library takes ownership of `label;` the caller must not free it afterwards.

== Return Value

1 on success, or a negative value for unsupported / failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Context whose padding mode must be RSA_PKCS1_OAEP_PADDING.
| *label*
| Label bytes to adopt, or NULL (with `llen` 0) to clear the label.
| *llen*
| Length of `label` in bytes.
|===


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