Struct Transcript 

pub struct Transcript { /* private fields */ }

Bytes prepared for signing or MAC computation, with a mandatory domain label.

Implementations

impl Transcript

pub fn new(label: Label) -> Self

Begin a transcript with a domain label.

The label has type Label, not &'static [u8], a substantive difference: a Label cannot be invented; only constants in crate::label supply it. When bytes were accepted, I-12 checks inspected the registry while a caller could bypass it with a string absent from the registry (for example an extension of an occupied label), invisible to every probe. That no longer compiles.

pub fn u8(&mut self, value: u8) -> &mut Self

Append one byte: algorithm identifier, version, tag.

pub fn u32le(&mut self, value: u32) -> &mut Self

Append a little-endian u32. Order is specified by the format.

pub fn u32be(&mut self, value: u32) -> &mut Self

Append a big-endian u32, used for chunk indices.

pub fn u64be(&mut self, value: u64) -> &mut Self

Append a big-endian u64, used for lease sequences.

pub fn fixed(&mut self, value: &[u8]) -> &mut Self

Append fixed-length data: key, fingerprint, identifier.

For variable-length fields use Transcript::field, or two different field sequences can produce identical bytes and the signature ceases to identify contents unambiguously.

pub fn field(&mut self, value: &[u8]) -> &mut Self

Append a variable-length field with a length prefix.

pub fn tail_after_declared_length(&mut self, value: &[u8]) -> &mut Self

Append a final block without a length prefix.

Permitted only when its length was already written into the transcript, as in a header signature, where u32le(HeaderLen) precedes the header itself.

pub fn as_bytes(&self) -> &[u8]

Completed bytes.

pub fn len(&self) -> usize

Byte length.

pub fn is_empty(&self) -> bool

Whether the transcript is empty. A label is always present, so always false.

Trait Implementations

impl Clone for Transcript

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Transcript

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

Formats the value using the given formatter.

impl Eq for Transcript

impl PartialEq for Transcript

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Transcript