[#CRYPTO_gcm128_encrypt]
= CRYPTO_gcm128_encrypt
:mrdocs:

Encrypt plaintext and update the GCM authentication state.

== Synopsis

Declared in `<openssl/modes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CRYPTO_gcm128_encrypt(
    xref:GCM128_CONTEXT-04.adoc[GCM128_CONTEXT]* ctx,
    unsigned char const* in,
    unsigned char* out,
    size_t len);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| GCM context ready for encryption (IV and optional AAD set).
| *in*
| Plaintext bytes of length `len.`
| *out*
| Ciphertext buffer of length `len` (may equal `in).`
| *len*
| Number of bytes to encrypt.
|===


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