Enum ScpMode 

pub enum ScpMode {
    S8,
    S16,
}

SCP03 secure-channel size mode (Amendment D §5.1 Table 5-1, bit b4 0x08): S8 uses 8-byte challenges/cryptograms and 8-byte (truncated) MACs (legacy); S16 (Amendment D v1.2) uses 16-byte challenges/cryptograms and full 16-byte MACs. The MAC chaining value is 16 bytes in both modes.

Variants

S8

8-byte fields, 8-byte truncated MACs.

S16

16-byte fields, full 16-byte MACs (Amendment D v1.2).

Implementations

impl ScpMode

pub const fn from_i(i_param: u8) -> Self

Derive the mode from the SCP03 i parameter (bit b4 0x08 ⇒ S16).

pub const fn field_len(self) -> usize

Challenge / cryptogram length in bytes (8 or 16).

pub const fn mac_len(self) -> usize

Length of the MAC appended to commands/responses: 8 bytes (truncated) in S8, the full 16 bytes in S16 (Amendment D §6.2.4/§6.2.5).

pub const fn l_bits(self) -> u16

KDF “L” (derived-data length in bits) for challenges and cryptograms: 0x0040 (64) in S8, 0x0080 (128) in S16 (Amendment D §6.2.2).

Trait Implementations

impl Clone for ScpMode

fn clone(&self) -> ScpMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ScpMode

impl Debug for ScpMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ScpMode

impl PartialEq for ScpMode

fn eq(&self, other: &ScpMode) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ScpMode