Crate uselesskey_core_negative 

Compatibility façade for negative fixture primitives.

This crate keeps existing uselesskey_core_negative paths stable while delegating to focused microcrates:

• uselesskey_core_negative_der for DER corruption helpers.
• uselesskey_core_negative_pem for PEM corruption helpers.

Examples

Corrupt a PEM string with a specific strategy:

use uselesskey_core_negative::{corrupt_pem, CorruptPem};

let pem = "-----BEGIN PUBLIC KEY-----\nABC=\n-----END PUBLIC KEY-----\n";
let bad = corrupt_pem(pem, CorruptPem::BadHeader);
assert!(bad.starts_with("-----BEGIN CORRUPTED KEY-----"));

Deterministic DER corruption from a variant string:

use uselesskey_core_negative::corrupt_der_deterministic;

let der = vec![0x30, 0x82, 0x01, 0x22, 0x10, 0x20];
let a = corrupt_der_deterministic(&der, "corrupt:test-v1");
let b = corrupt_der_deterministic(&der, "corrupt:test-v1");
assert_eq!(a, b); // same variant ⇒ same corruption

Enums

CorruptPem

Strategies for corrupting PEM-encoded data.

Functions

corrupt_der_deterministic

Choose a corruption strategy deterministically from variant and apply it to der.

corrupt_pem

Apply a specific CorruptPem corruption strategy to the given PEM string.

corrupt_pem_deterministic

Choose a corruption strategy deterministically from variant and apply it to pem.

flip_byte

XOR the byte at offset with 0x01, returning the original if offset is out of range.

truncate_der

Truncate der to at most len bytes, returning the original if already shorter.