Struct sha1collisiondetection::Builder

pub struct Builder(/* private fields */);

Configures the collision-detecting SHA-1 algorithm.

Implementations

impl Builder

pub fn safe_hash(self, v: bool) -> Self

Configures collision mitigation.

Collision attacks are thwarted by hashing a detected near-collision block 3 times. Think of it as extending SHA-1 from 80-steps to 240-steps for such blocks: The best collision attacks against SHA-1 have complexity about 2^60, thus for 240-steps an immediate lower-bound for the best cryptoanalytic attacks would be 2^180. An attacker would be better off using a generic birthday search of complexity 2^80.

Enabling safe SHA-1 hashing will result in the correct SHA-1 hash for messages where no collision attack was detected, but it will result in a different SHA-1 hash for messages where a collision attack was detected. This will automatically invalidate SHA-1 based digital signature forgeries.

Enabled by default.

pub fn use_ubc(self, v: bool) -> Self

Configures use of Unavoidable Bitconditions.

This provides a significant speed up.

Enabled by default.

pub fn detect_collisions(self, v: bool) -> Self

Configures collision detection.

Enabled by default.

pub fn build(self) -> Sha1CD

Finalizes the configuration.

Trait Implementations

impl Default for Builder

fn default() -> Builder

Returns the “default value” for a type.