[#EVP_PKEY_decrypt_old]
= EVP_PKEY_decrypt_old
:mrdocs:

Decrypt a session key with a private key using the legacy EVP_PKEY path (deprecated).

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
EVP_PKEY_decrypt_old(
    unsigned char* dec_key,
    unsigned char const* enc_key,
    int enc_key_len,
    xref:EVP_PKEY.adoc[EVP_PKEY]* private_key);
----

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

Length of decrypted key on success, or a negative value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *dec_key*
| Output buffer for the recovered plaintext key material.
| *enc_key*
| Encrypted key bytes.
| *enc_key_len*
| Length of `enc_key` in bytes.
| *private_key*
| Private key used for decryption.
|===


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