Hash verification tool

This tool verifies the integrity of a given file with a hash. It uses
md5sum, sha1sum and sha256sum as needed.

Issue #748
devel
Stephan Mueller 9 years ago committed by Norman Feske
parent 9b22983e58
commit 4c89f4f00f
  1. 125
      tool/download_hashver

@ -0,0 +1,125 @@
#!/bin/bash
#
# \brief Hash verification tool
# \author Stephan Müller
# \date 2013-05-24
#
# Script to be invoked as
# $0 <file to be checked> <hash or hash file> <hash type>
#
# hash or hash file: The script checks whether the handed in value is a file --
# if it is a file, it uses it with md5sum/sha1sum/sha256sum -c.
# Otherwise, the value is used as a direct hash value.
#
# Hash type can be either: md5 sha1 sha256
#
# Script returns 0 on success. Any other value is a failure.
FILE=$1
HASH=$2
HASHTYPE=$3
verify_hashfile()
{
file=$1
hashfile=$2
hashtype=$3
dirfile=$(dirname $file)
dirhash=$(dirname $file)
basehash=$(basename $hashfile)
#
# The tool is invoked with the file to be checked and the file holding the
# hashes. Thus, it cannot expect the hash file to be in the same directory
# as the file to be checked. But the problem is that the tools md5sum and
# Co expect the hash file in the local directory when you invoke the tool
# with -C. There is no way that you can provide a different location for
# the hash file.
#
# The code now tries to check whether the dirname of the file to be checked
# and the hash file are the same. If they are not, it creates a symlink to
# allow the tools to work. The trap ensures that in case of a termination
# (regular or otherwise), the symlink is removed such that there is no
# leftover from the script.
#
if [ "$dirfile" != "$dirhash" ];
then
trap "rm -f $dirfile/$basehash" 0 1 2 3 15
ln -s $hashfile $dirfile/
fi
cd $dirfile
ret=0
case "$hashtype" in
md5)
md5sum -c $basehash
ret=$?
;;
sha1)
sha1sum -c $basehash
ret=$?
;;
sha256)
sha256sum -c $basehash
ret=$?
;;
*)
echo "Wrong hash type $hashtype"
exit 1
;;
esac
if [ "$ret" -ne 0 ]
then
echo "Hash verification for file $file failed"
exit 1
fi
echo "Hash verification for file $file passed"
exit 0
}
# Verify the file
# \param file to be verified
# \param hash (file)
#
# function causes script to exit:
# return 0 implies all passed
# any other return code implies failure
verify_file()
{
file=$1
hash=$2
hashtype=$3
if [ -f "$hash" ]
then
verify_hashfile $file $hash $hashtype
fi
case "$hashtype" in
md5)
calchash=$(md5sum $file | cut -f1 -d" ")
;;
sha1)
calchash=$(sha1sum $file | cut -f1 -d" ")
;;
sha256)
calchash=$(sha256sum $file | cut -f1 -d" ")
;;
*)
echo "Wrong hash type $hashtype"
exit 1
;;
esac
if [ "$calchash" != "$hash" ]
then
echo -e "Hash verification for file $file failed:\ncalc hash: $calchash\nexp hash: $hash"
exit 1
fi
echo "Hash verification for file $file passed"
exit 0
}
verify_file $FILE $HASH $HASHTYPE
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