[#RSA_verify_PKCS1_PSS_mgf1]
= RSA_verify_PKCS1_PSS_mgf1
:mrdocs:

Verify a PKCS#1 PSS‐encoded digest using an explicit MGF1 hash (deprecated).

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
RSA_verify_PKCS1_PSS_mgf1(
    xref:RSA.adoc[RSA]* rsa,
    unsigned char const* mHash,
    xref:EVP_MD.adoc[EVP_MD] const* Hash,
    xref:EVP_MD.adoc[EVP_MD] const* mgf1Hash,
    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 encoding is valid, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *rsa*
| RSA key whose modulus length defines the encoded message size.
| *mHash*
| Message digest that was signed.
| *Hash*
| Hash algorithm that produced `mHash` and labels the PSS encoding.
| *mgf1Hash*
| Hash algorithm used by MGF1, or NULL to use `Hash.`
| *EM*
| Encoded message to verify (typically RSA_size(rsa) bytes).
| *sLen*
| Salt length in bytes, or a special RSA_PSS_SALTLEN_* value.
|===


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