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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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes