From 7bcdc3b4ca460aec2b98fb2dca6165788c562b05 Mon Sep 17 00:00:00 2001
From: Igor Tolmachev <me@igorek.dev>
Date: Sat, 20 Jul 2024 16:52:39 +0900
Subject: Partial aes implementation and others improvements

---
 src/zip/encryption.rs | 89 ---------------------------------------------------
 1 file changed, 89 deletions(-)
 delete mode 100644 src/zip/encryption.rs

(limited to 'src/zip/encryption.rs')

diff --git a/src/zip/encryption.rs b/src/zip/encryption.rs
deleted file mode 100644
index f317245..0000000
--- a/src/zip/encryption.rs
+++ /dev/null
@@ -1,89 +0,0 @@
-use crate::utils::ReadUtils;
-use crate::zip::{ZipError, ZipResult};
-use std::io::{Read, Result as IoResult};
-
-const TABLE: [u32; 256] = generate_table();
-
-const fn generate_table() -> [u32; 256] {
-    let mut table = [0; 256];
-
-    let mut i = 0;
-    while i <= 255 {
-        let mut t = i as u32;
-
-        let mut j = 0;
-        while j < 8 {
-            if (t & 1) > 0 {
-                t = (t >> 1) ^ 0xEDB88320
-            } else {
-                t >>= 1
-            }
-            j += 1;
-        }
-
-        table[i] = t;
-        i += 1
-    }
-
-    table
-}
-
-fn crc32(byte: u8, crc: u32) -> u32 {
-    (crc >> 8) ^ TABLE[((crc & 0xFF) as u8 ^ byte) as usize]
-}
-
-pub struct WeakDecoder<Io: Read> {
-    key0: u32,
-    key1: u32,
-    key2: u32,
-    io: Io,
-}
-
-impl<Io: Read> WeakDecoder<Io> {
-    pub fn new(io: Io, check: u8, password: &[u8]) -> ZipResult<Self> {
-        let mut decoder = Self {
-            key0: 305419896,
-            key1: 591751049,
-            key2: 878082192,
-            io,
-        };
-
-        for c in password {
-            decoder.update_keys(*c)
-        }
-
-        let buf = decoder.read_arr::<12>()?;
-        if check != buf[11] {
-            return Err(ZipError::IncorrectPassword.into());
-        }
-
-        Ok(decoder)
-    }
-
-    fn update_keys(&mut self, byte: u8) {
-        self.key0 = crc32(byte, self.key0);
-        self.key1 = self
-            .key1
-            .wrapping_add(self.key0 & 0xFF)
-            .wrapping_mul(134775813)
-            .wrapping_add(1);
-        self.key2 = crc32((self.key1 >> 24) as u8, self.key2);
-    }
-
-    fn decode_byte(&mut self, byte: u8) -> u8 {
-        let key = self.key2 | 2;
-        let byte = byte ^ ((key.wrapping_mul(key ^ 1)) >> 8) as u8;
-        self.update_keys(byte);
-        byte
-    }
-}
-
-impl<Io: Read> Read for WeakDecoder<Io> {
-    fn read(&mut self, buf: &mut [u8]) -> IoResult<usize> {
-        let bytes = self.io.read(buf)?;
-        for i in 0..bytes {
-            buf[i] = self.decode_byte(buf[i]);
-        }
-        Ok(bytes)
-    }
-}
-- 
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