Struct rustls::crypto::cipher::KeyBlockShape

source · 
pub struct KeyBlockShape {
    pub enc_key_len: usize,
    pub fixed_iv_len: usize,
    pub explicit_nonce_len: usize,
}
Expand description

How a TLS1.2 key_block is partitioned.

Note: ciphersuites with non-zero mac_key_length are not currently supported.

Fields§

§enc_key_len: usize

How long keys are.

enc_key_length terminology is from the standard (RFC5246 A.6).

§fixed_iv_len: usize

How long the fixed part of the ‘IV’ is.

fixed_iv_length terminology is from the standard (RFC5246 A.6).

This isn’t usually an IV, but we continue the terminology misuse to match the standard.

§explicit_nonce_len: usize

This is a non-standard extension which extends the key block to provide an initial explicit nonce offset, in a deterministic and safe way. GCM needs this, chacha20poly1305 works this way by design.

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