[#EVP_PKEY_verify_recover]
= EVP_PKEY_verify_recover
:mrdocs:

Recover the signed data from a signature (algorithms that support recovery, e.g. RSA).

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_verify_recover(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    unsigned char* rout,
    size_t* routlen,
    unsigned char const* sig,
    size_t siglen);
----

== Return Value

1 on success, 0 or a negative value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Context previously prepared with EVP_PKEY_verify_recover_init().
| *rout*
| Output buffer for the recovered data, or NULL to only query the required length.
| *routlen*
| On entry, capacity of `rout` when non‐NULL; on return, recovered length in bytes.
| *sig*
| Signature bytes to recover from.
| *siglen*
| Length of `sig` in bytes.
|===


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