SHA2 Algorithm support in Adobe Acrobat 9

Hello,
1) Does Acrobat 9 supports SHA2 Hash algorithms while signing PDF file?
2) As per my understanding PDF is signed using below approach
    Step 1. Take the PDF contents
    Step 2. Calculate the Hash of the content
    Step 3. Then sign(Encrypt) the hash. (here again we calculate the hash)
So we are hashing the content twice.
If I use SHA1 algorithm in Step2 and SHA2 algorithm in Step3, Adobe 9 is able to verify the signature. But if i use SHA2 algorithm in Step1 & Step 2
Adobe 9 is saying "Content altered....."
Why so?
Please help.
Thanks in advance
Priyanka

SHA2 was only added in Acrobat 9.1. Also, the Microsoft Base CSP is needed for SHA2 support - Base CSP is included in Vista and Windows 7, but in XP it needs to be downloaded as a seperate addon.
How are you setting the values in your SecurityHandler? Off the top of my head, I believe in order to use SHA2 to hash the content (your "Step 2") you need to use AES-256 as your encryption algorithm which required a different cryptVersion be set in your SecurityHandler structure.

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