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Informational 15 Bitcoin

Add ExactSizeEncoder for known-length Encoders

Public commit record

What the developer wrote

Authored by Mitchell Bagot

68/100 · Adequate
Add ExactSizeEncoder for known-length Encoders

Current encoders have no way to distinguish between fixed and variable
sized encoders. Having a way to get the size of fixed-size encoders
in constant time allows for a trivial implementation of
ExactSizeIterator for EncodableByteIter.

Add ExactSizeEncoder trait, implement it on the consensus_encoding
encoders where applicable. Add encoder_newtype_exact macro for
newtype encoders that wrap ExactSizeEncoders and convert most
existing encoder_newtype calls to encoder_newtype_exact.
✓ Descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context
The short version

What changed, and why it matters

This commit is a routine feature addition to the Rust Bitcoin library. It introduces a new ExactSizeEncoder trait that lets callers ask fixed-size encoders how many bytes they will produce, and adds an ExactSizeIterator implementation for the byte iterator. There is no security fix or vulnerability here; it is purely an API enhancement with tests.

Recommended action

No security action required. Treat as a normal library feature/API change.

Security signals we found

No strong security signals were identified.

Risk score

Why this scored 15/100

Our methodology →
Potential impact 0/30
Exploitability 0/25
Stealth signal 0/15
Affected reach 0/15
Confidence 10/10
Evidence quality 5/5
Human-validated context

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