Added vTPM get HCL report contains user defined data

[pawelpros]

Added vTPM get HCL report which allows to include user defined data in retrieved report

• Added temporary limit for max data (50 bytes) - Azure vTPM supports only SHA384 bytes
• Added refresh nvindex method which enables setting user_data field
• Added get HCL report method which uses user provided data and include it in nvindex

How to use

Sample usage based on az-cvm-vtpm/az-tdx-vtpm/src/main.rs:

   let user_hash_64bytes = vec![129, 74, 176, 151, 217, 100, 189, 145, 134, 54, 115, 9, 167, 175, 181, 132, 104, 26, 79, 83, 206, 35, 227, 133, 13, 252, 13, 125, 185, 191, 33, 195, 3, 233, 185, 245, 9, 72, 154, 252, 29, 4, 105, 117, 132, 67, 22, 81, 175, 110, 207, 6, 210, 132, 161, 56, 7, 237, 198, 214, 220, 223, 166, 117];
    println!("user_hash_64bytes HEX: {:?}", hex::encode(&user_hash_64bytes));
    let bytes = vtpm::get_report_with_data(&user_hash_64bytes)?;

Testing done

Tested on virtual machine spawned in Azure by invoking below steps:

1. Updating az-cvm-vtpm/az-tdx-vtpm/src/main.rs
2. Compiling code
3. Running sample main
4. Output from library:
   user_hash_64bytes HEX: "814ab097d964bd9186367309a7afb584681a4f53ce23e3850dfc0d7db9bf21c303e9b9f509489afc1d04697584431651af6ecf06d284a13807edc6d6dcdfa675"
5. Output from TPM2_tools:
   Command: sudo tpm2_nvread -C o 0x01400001
   Result:
   json { "keys":[], "vm-configuration":{}, "user-data":"814AB097D964BD9186367309A7AFB584681A4F53CE23E3850DFC0D7DB9BF21C303E9B9F509489AFC1D04697584431651AF6ECF06D284A13807EDC6D6DCDFA675" }