[#CRYPTO_xts128_encrypt]
= CRYPTO_xts128_encrypt
:mrdocs:

Encrypt or decrypt data with a 128‐bit block cipher in XTS mode.

== Synopsis

Declared in `<openssl/modes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CRYPTO_xts128_encrypt(
    xref:XTS128_CONTEXT-02.adoc[XTS128_CONTEXT] const* ctx,
    unsigned char const iv[],
    unsigned char const* inp,
    unsigned char* out,
    size_t len,
    int enc);
----

== Return Value

0 on success, or ‐1 if `len` is invalid.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| XTS context holding the two keys and block functions.
| *iv*
| 16‐byte tweak / sector IV for this unit.
| *inp*
| Input plaintext or ciphertext of length `len` (at least 16).
| *out*
| Output buffer of length `len` (may equal `inp).`
| *len*
| Number of bytes to process (must be >= 16).
| *enc*
| Non‐zero to encrypt, zero to decrypt.
|===


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