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资源说明：aes加密代码，非常完整，包括加密解密。
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 2 file format is as follows.
3 Octets - 'AES'
1 Octet - 0x02 (Version)
1 Octet - Reserved
.... Start of repeating extension block section
2 Octet - Length in octets (in network byte order) of an extension
identifier and contents. If 0x0000, then no further
extensions exist and the next octet is the start of the
Initialization Vector (IV). Following an extension,
this length indicator would appear again to indicate
presence or absense of another extension and the size of
any such extension.
nn Octets - Extension identifier. This is either a URI or an
identifier defined by the AES developer community and
documented on the standard extensions page, either
of which is terminated by a single 0x00 octet. All
extension identifiers are case sensitive.
Examples of URIs:
http://www.aescrypt.com/extensions/creator/
urn:oid:1.3.6.1.4.1.17090.55.14
urn:uuid:85519EA3-1DA6-45b9-9041-8CD368D8C086
Note:
A URI was used to allow anybody to define extension
types, though we should strive to define a standard
set of extensions.
Examples of standard extension identifiers:
CREATED-DATE
CREATED-BY
A special extension is defined that has no name, but is
merely a "container" for extensions to be added after the
AES file is initially created. Such an extension avoids
the need to read and re-write the entire file in order to
add a small extension. Software tools that create AES
files should insert a 128-octet "container" extension,
placing a 0x00 in the first octet of the extension
identifier field. Developers may then insert extensions
into this "container" area and reduce the size of this
"container" as necessary. If larger extensions are added
or the "container" area is filled entirely, then reading
and re-writing the entire file would be necessary to add
additional extensions.
nn Octets - The contents of the extension
.... End of repeating extension block section
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 136 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.
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.
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