Struct DataFingerprint 

pub struct DataFingerprint { /* private fields */ }

Fast integrity check for account data using FNV-1a hash.

Use this to detect unexpected data mutations around CPI calls. Not cryptographically secure – purely for integrity assertions.

Implementations

impl DataFingerprint

pub fn capture(account: &AccountView, len: usize) -> Self

Compute a fast fingerprint of the first len bytes of account data.

Uses FNV-1a (fast, no dependencies, good collision resistance for short inputs). Not suitable for cryptographic purposes.

pub fn verify_unchanged(&self, account: &AccountView) -> ProgramResult

Verify the data has not changed since the snapshot.

pub fn hash(&self) -> u64

Get the fingerprint hash.

Trait Implementations

impl Clone for DataFingerprint

fn clone(&self) -> DataFingerprint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DataFingerprint

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

Formats the value using the given formatter.

impl Copy for DataFingerprint