readme.txt

AES, 即Advanced Encryption Standard高级加密标准模块, 它是目前国际上最先进的加密技术, 是基于DES之后的最新发布的高段加密标准. 该标准由美国NIST(Nation

AESCrypt File Format Description

Items in quotes are a literal string.  Words outside of quotes
are a textual description of the contents.  Fixed-valued octets are
written in hexidecimal form (e.g., 0x01).

The AESCrypt version 0 file format is as follows.
      3 Octets - 'AES'
      1 Octet  - 0x00 (Version)
      1 Octet  - File size modulo 16 in least significant bit positions
     16 Octets - Initialization Vector (IV)
     nn Octets - Encrypted message (2^64 octets max)
     32 Octets - HMAC

     Thus, the footprint of the file is at least 53 octets.

The AESCrypt version 1 file format is as follows.
      3 Octets - 'AES'
      1 Octet  - 0x01 (Version)
      1 Octet  - Reserved
     16 Octets - Initialization Vector (IV) used for encrypting the
                 IV and symmetric key that is actually used to encrypt
                 the bulk of the plaintext file.
     48 Octets - Encrypted IV and 256-bit AES key used to encrypt the
                 bulk of the file
                 16 octets - Initialization Vector
                 32 octets - encryption key
     32 Octets - HMAC
     nn Octets - Encrypted message (2^64 octets max)
      1 Octet  - File size modulo 16 in least significant bit positions
     32 Octets - HMAC

     Thus, the footprint of the file is at least 134 octets.