From 4213d57bdf70b6339bc4affdc751c296f9aa14f0 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Tue, 7 Apr 2015 01:05:28 -0400
Subject: problem 25

---
 src/crack.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/crack.rs')

diff --git a/src/crack.rs b/src/crack.rs
index 39a8e1a..abfd84a 100644
--- a/src/crack.rs
+++ b/src/crack.rs
@@ -427,6 +427,14 @@ pub fn recover_mt19937_key_from_time (token: &[u8]) -> Option<u32> {
     return None;
 }
 
+pub fn crack_aes_128_ctr_random_access<F> (ciphertext: &[u8], edit: F) -> Vec<u8> where F: Fn(&[u8], usize, &[u8]) -> Vec<u8> {
+    let empty_plaintext: Vec<u8> = ::std::iter::repeat(b'\x00')
+        .take(ciphertext.len())
+        .collect();
+    let keystream = edit(ciphertext, 0, &empty_plaintext[..]);
+    return fixed_xor(&keystream[..], ciphertext);
+}
+
 fn crack_single_byte_xor_with_confidence (input: &[u8]) -> (u8, f64) {
     let mut min_diff = 100.0;
     let mut best_key = 0;
-- 
cgit v1.2.3-54-g00ecf