Hi Mikheil,
you can find the documentation for Agile-Encryption (and others) at the
"[MS-OFFCRYPTO]: Office Document Cryptography Structure Specification" [1]
The difference between POI 3.9 and the current POI (after #55818) is that now
also
other ciphers and hash algorithms apart of AES/SHA1 are supported.
- The are still a few security related features which POI doesn't support right
now:
- CryptoAPI *)
- I haven't tested RC4 (stream cipher) at all - only the block ciphers -
I'm quite sure that implementation, which is focused on block ciphers,
doesn't
work well with RC4
- XOR Obfuscation *)
- (Binary) Document Write Protection
- So the current POI version can decrypt your Excel 2013 samples, right?
- Does your program support agile and standard encryption?
> ... some explanation on how to read sheet protection information from excel
2013 ...
Just to clarify, the encryption is not specific to Excel files, but
covers/wraps the whole file -
I don't know if there's a sheet protection feature via encryption.
Please narrow your question a bit to where you want to have an explanation.
Best wishes,
Andi
[1] http://msdn.microsoft.com/en-us/library/cc313071(v=office.12).aspx
*) I haven't checked the BiffEncryption classes, so I might be wrong ...
On 01.02.2014 10:43, Mikheil wrote:
I have problem from extracting hashValue and saltValue from Excel 2013
Protected worksheet using POI 3.9.
People can't use my little opensource program if they had Excel 2013.
There is no problem read and check password validation in Excel 2010, Excle
2007 and Excel 2003;
I found your issue related to this problem 55544
<http://poi.apache.org/changes.html> . But 3.10.final is not yet avalaible
to download.
I have downloaded and built "3.11.beta1" version poi sourceCode (Until
3.10.final will be published).
I will be so glead if you give me some explanation on how to read sheet
protection information from excel 2013 workbook (hashValue, saltValue,
algoritmName), because there is no documentation about this.
Thank you.
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