[#RSA_padding_check_PKCS1_OAEP]
= RSA_padding_check_PKCS1_OAEP
:mrdocs:

Verify PKCS#1 OAEP padding and recover the encoded message (deprecated).

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
RSA_padding_check_PKCS1_OAEP(
    unsigned char* to,
    int tlen,
    unsigned char const* f,
    int fl,
    int rsa_len,
    unsigned char const* p,
    int pl);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

Length of the recovered message on success, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *to*
| Destination buffer for the recovered message.
| *tlen*
| Capacity of `to` in bytes.
| *f*
| Encoded message after RSA public operation (typically modulus‐sized).
| *fl*
| Length of `f` in bytes.
| *rsa_len*
| RSA modulus size in bytes (used to validate encoding length).
| *p*
| Optional OAEP encoding parameter / label octets, or NULL.
| *pl*
| Length of `p` in bytes.
|===


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