[#RSA_public_encrypt]
= RSA_public_encrypt
:mrdocs:

Encrypt `flen` bytes from `from` with RSA public key `rsa` (deprecated).

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
RSA_public_encrypt(
    int flen,
    unsigned char const* from,
    unsigned char* to,
    xref:RSA.adoc[RSA]* rsa,
    int padding);
----

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

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *flen*
| Length of `from` in bytes.
| *from*
| Plaintext bytes to encrypt (often a session key).
| *to*
| Output buffer of at least RSA_size(`rsa)` bytes.
| *rsa*
| RSA public key.
| *padding*
| Padding mode such as RSA_PKCS1_PADDING or RSA_PKCS1_OAEP_PADDING.
|===


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