[#RSA_padding_check_PKCS1_OAEP_mgf1]
= RSA_padding_check_PKCS1_OAEP_mgf1
:mrdocs:

Verify PKCS#1 OAEP padding with explicit digests and recover the message (deprecated).

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
RSA_padding_check_PKCS1_OAEP_mgf1(
    unsigned char* to,
    int tlen,
    unsigned char const* from,
    int flen,
    int num,
    unsigned char const* param,
    int plen,
    xref:EVP_MD.adoc[EVP_MD] const* md,
    xref:EVP_MD.adoc[EVP_MD] const* mgf1md);
----

[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, 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.
| *from*
| Encoded OAEP block.
| *flen*
| Length of `from` in bytes.
| *num*
| RSA modulus size in bytes.
| *param*
| Optional OAEP label bytes, or NULL.
| *plen*
| Length of `param` in bytes.
| *md*
| Hash used by OAEP, or NULL for SHA‐1.
| *mgf1md*
| Hash used by MGF1, or NULL to use `md.`
|===


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