github.com/hugh712/snapd@v0.0.0-20200910133618-1a99902bd583/osutil/digest_test.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2014-2015 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package osutil_test
    21  
    22  import (
    23  	"crypto"
    24  	"crypto/sha512"
    25  	"io/ioutil"
    26  	"path/filepath"
    27  
    28  	. "gopkg.in/check.v1"
    29  
    30  	"github.com/snapcore/snapd/osutil"
    31  )
    32  
    33  type FileDigestSuite struct{}
    34  
    35  var _ = Suite(&FileDigestSuite{})
    36  
    37  func (ts *FileDigestSuite) TestFileDigest(c *C) {
    38  	exData := []byte("hashmeplease")
    39  
    40  	tempdir := c.MkDir()
    41  	fn := filepath.Join(tempdir, "ex.file")
    42  	err := ioutil.WriteFile(fn, exData, 0644)
    43  	c.Assert(err, IsNil)
    44  
    45  	digest, size, err := osutil.FileDigest(fn, crypto.SHA512)
    46  	c.Assert(err, IsNil)
    47  	c.Check(size, Equals, uint64(len(exData)))
    48  	h512 := sha512.Sum512(exData)
    49  	c.Check(digest, DeepEquals, h512[:])
    50  }