how to get hash-of-header-and-secret

[鹏 <wkp4666@xxxxxxx>]

 hi,
    I want to konw how to get the  hash-of-header-and-secret, i read the http://ceph.com/docs/master/radosgw/s3/authentication/ , but i still not understand , I hope I can get example . if i want PUT a bucket for the user

{ "user_id": "johndoe",
  "rados_uid": 0,
  "display_name": "John Doe",
  "email": "john@xxxxxxxxxxx",
  "suspended": 0,
  "subusers": [],
  "keys": [
    { "user": "johndoe",
      "access_key": "QFAMEDSJP5DEKJO0DDXY",
      "secret_key": "iaSFLDVvDdQt6lkNzHyW4fPLZugBAI1g17LO0+87"}],
  "swift_keys": []}

I use the curl -XPUT http://kp/myNewBucket  -H"x-amz-acl: public-read-write" -H"Authorization: AWS QFAMEDSJP5DEKJO0DDXY:{hash-of-header-and-secret}".

how to get  hash-of-header-and-secret

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