[#EVP_PKEY_encrypt_old]
= EVP_PKEY_encrypt_old
:mrdocs:

Encrypt a session key with a public 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_encrypt_old(
    unsigned char* enc_key,
    unsigned char const* key,
    int key_len,
    xref:EVP_PKEY.adoc[EVP_PKEY]* pub_key);
----

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

Prefer EVP_PKEY_encrypt_init() / EVP_PKEY_encrypt().

== Return Value

Number of encrypted bytes written to `enc_key,` or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *enc_key*
| Output buffer for the encrypted key material.
| *key*
| Plaintext key bytes to encrypt.
| *key_len*
| Length of `key` in bytes.
| *pub_key*
| Public key used for encryption (typically RSA).
|===


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