[#CRYPTO_128_unwrap_pad]
= CRYPTO_128_unwrap_pad
:mrdocs:

Unwrap a key with AES Key Wrap with Padding (RFC 5649) using `block.`

== Synopsis

Declared in `<openssl/modes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
CRYPTO_128_unwrap_pad(
    void* key,
    unsigned char const* icv,
    unsigned char* out,
    unsigned char const* in,
    size_t inlen,
    xref:block128_f.adoc[block128_f] block);
----

== Return Value

Length of unwrapped data written to `out,` or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Cipher‐specific expanded key for `block.`
| *icv*
| Optional expected AIV / integrity value, or NULL for the default.
| *out*
| Buffer for the unwrapped key material.
| *in*
| Wrapped key octets.
| *inlen*
| Length of `in` in bytes.
| *block*
| Block‐encrypt/decrypt function used by the unwrap algorithm.
|===


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