ChaCha20 question, Block Counter?

[Mark Joseph <mark@p6r.com>]

Hi,

Where does the Block Counter go in the request below?   The IVCounterNonce is  64 bits which is the smallest defined IV for ChaCha20.

   

(From test case CS-BC-M-CHACHA20-1-21.xml)

 <BatchItem>

    <Operation type="Enumeration" value="Encrypt"/>

    <RequestPayload>

      <UniqueIdentifier type="TextString" value="$UNIQUE_IDENTIFIER_0"/>

      <CryptographicParameters>

      </CryptographicParameters>

      <Data type="ByteString" value="00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>

      <IVCounterNonce type="ByteString" value="0000000000000000"/>

    </RequestPayload>

  </BatchItem>

Thanks,

Mark Joseph

P6R, Inc

408-205-0361