add aes-crypto feature to default and update README

Cargo.toml

@@ -34,7 +34,7 @@ deflate = ["flate2/rust_backend"]
 deflate-miniz = ["flate2/default"]
 deflate-zlib = ["flate2/zlib"]
 unreserved = []
-default = ["bzip2", "deflate", "time"]
+default = ["aes-crypto", "bzip2", "deflate", "time"]
 
 [[bench]]
 name = "read_entry"

README.md

@@ -42,8 +42,9 @@ zip = { version = "0.5", default-features = false }
 
 The features available are:
 
-* `deflate`: Enables the deflate compression algorithm, which is the default for zipfiles
+* `aes-crypto`: Enables decryption of files which were encrypted with AES. Supports AE-1 and AE-2 methods.
 * `bzip2`: Enables the BZip2 compression algorithm.
+* `deflate`: Enables the deflate compression algorithm, which is the default for zipfiles
 * `time`: Enables features using the [time](https://github.com/rust-lang-deprecated/time) crate.
 
 All of these are enabled by default.

src/aes.rs

@@ -2,7 +2,7 @@
 //!
 //! This was implemented according to the [WinZip specification](https://www.winzip.com/win/en/aes_info.html).
 //! Note that using CRC with AES depends on the specific encryption specification used, AE-1 or AE-2.
-//! AE-2 doesn't set the CRC field correctly, even though some zip files still have CRC set even with AE-2.
+//! If the file is marked as encrypted with AE-2 the CRC field is ignored, even if it isn't set to 0.
 
 use crate::aes_ctr;
 use crate::types::AesMode;