[#RSA_verify_PKCS1_PSS]
= RSA_verify_PKCS1_PSS
:mrdocs:

Verify an RSA‐PSS encoded message EM against a message hash (deprecated).

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
RSA_verify_PKCS1_PSS(
    xref:RSA.adoc[RSA]* rsa,
    unsigned char const* mHash,
    xref:EVP_MD.adoc[EVP_MD] const* Hash,
    unsigned char const* EM,
    int sLen);
----

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

1 if the PSS encoding is valid, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *rsa*
| RSA public key used for verification context (size / parameters).
| *mHash*
| Hash of the original message.
| *Hash*
| Digest that produced `mHash` and is used by PSS.
| *EM*
| Encoded message of RSA_size(`rsa)` bytes (typically after RSA public operation).
| *sLen*
| PSS salt length in bytes, or a special negative sentinel accepted by the implementation.
|===


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