[#CRYPTO_ccm128_decrypt]
= CRYPTO_ccm128_decrypt
:mrdocs:

Decrypt ciphertext and update the CCM authentication state.

== Synopsis

Declared in `<openssl/modes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CRYPTO_ccm128_decrypt(
    xref:CCM128_CONTEXT-0c.adoc[CCM128_CONTEXT]* ctx,
    unsigned char const* inp,
    unsigned char* out,
    size_t len);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| CCM context ready for decryption (nonce and optional AAD set).
| *inp*
| Ciphertext bytes of length `len.`
| *out*
| Plaintext buffer of length `len.`
| *len*
| Number of bytes to decrypt.
|===


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