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      Verifying the signature

      #RSA sign type

      After receiving a response or notification, perform the following steps to verify the signature:

      1. Generate the pre-sign string as described in Generating Pre-sign String.
      2. Use the RSA algorithm to calculate a message digest.
      3. Use the RSA public key to de-sign the signature (the value of the sign field) to a message digest.
      4. Compare the two message digests obtained in step 2 and step 3. If the digests are the same, then it indicates that the signed data has not been changed.