Struct AeadEncryptCtx 

pub struct AeadEncryptCtx(/* private fields */);

AEAD encryption context (GCM, CCM, ChaCha20-Poly1305).

Implementations

impl AeadEncryptCtx

pub fn new( alg: &CipherAlg, key: &[u8], iv: &[u8], params: Option<&Params<'_>>, ) -> Result<Self, ErrorStack>

Create an AEAD encryption context.

Panics

Panics if alg is not an AEAD cipher (EVP_CIPH_FLAG_AEAD_CIPHER not set).

Errors

pub fn set_aad(&mut self, aad: &[u8]) -> Result<(), ErrorStack>

Set additional authenticated data (AAD). Call before first update.

Panics

Panics if aad.len() > i32::MAX (effectively impossible in practice).

Errors

pub fn update( &mut self, input: &[u8], output: &mut [u8], ) -> Result<usize, ErrorStack>

Feed input into the AEAD cipher; write to output.

Errors

pub fn finalize(&mut self, output: &mut [u8]) -> Result<usize, ErrorStack>

Flush any remaining bytes. Must be called before tag.

Errors

pub fn tag(&self, tag: &mut [u8]) -> Result<(), ErrorStack>

Retrieve the authentication tag after finalize.

tag must be 16 bytes for GCM (EVP_CTRL_GCM_GET_TAG = 16).

Panics

Panics if tag.len() > i32::MAX.

Errors