Signature checking

signcheck.sh

#!/bin/sh
# This routine was written by "Amerefelie"
#	https://www.linuxquestions.org/quest...nature-137111/
#Last updated 090507 by Andy Lavarre alavarre@gmail.com to insert comment analysis documentation
#Last edited 081231 by Amerefelieat 07:58 AM.. Reason: updated script for hash test fail. 
#Usage:
#	tar_verify $1
#	where $1 is the name of the xxx.tar.gz file
# Name the key ring
VENDOR_KEYRING=vendors.gpg
# Report the input
echo "tar file is "$1
# If the signature file xxx.tar.gz.sig exists
if [ -e "$1.sig" ]
#	Then strip off the name of the file
then KEYID="0x`gpg --verify $1.sig $1 2>&1 | grep 'key ID' | awk '{print $NF}'`"
echo "The key ID is "$KEYID
#	Pull the public key from the default key server to the Vendor keyring
gpg --no-default-keyring --keyring $VENDOR_KEYRING --keyserver pgp.mit.edu --recv-key $KEYID
#	Verify the file
gpg --keyring $VENDOR_KEYRING --verify $1.sig $1
# Otherwise, if the signature file is an ASCII
elif [ -e "$1.asc" ]
#	Then strip off the name of the file
then KEYID="0x`gpg --verify $1.asc $1 2>&1 | grep 'key ID' | awk '{print $NF}'`"
echo "The key ID is "$KEYID
#	Pull the public key from the default key server to the Vendor keyring
gpg --no-default-keyring --keyring $VENDOR_KEYRING --keyserver pgp.mit.edu --recv-key $KEYID
#	Verify the file
gpg --keyring $VENDOR_KEYRING --verify $1.asc $1
# Otherwise complain that it does not exist
else echo "No GPG signature File"
# Finish
fi
# Now if not PGP/GPG, but an MD5 instead and the hash file exists
if [ -e "$1.md5" ]
#	Then calculate the MD5 hash and compare to the hash file; if the same
then if md5sum $1 | diff -i - $1.md5 2> /dev/null
#	 Then success
then echo "Md5 hash match!"
#	Otherwise complain
else echo "Md5 hash does not match!"
# Finish
fi
# Otherwise complain that it does not exist
else echo "Md5 hash file not found."
# Finish
fi
# Now if not PGP/GPG, but an sha1 instead and the hash file exists
if [ -e "$1.sha1" ]
#	Then calculate the sha1 hash and compare to the hash file; if the same
then if sha1sum $1 | diff -i - $1.sha1 2> /dev/null
#	 Then success
then echo "Sha1 hash match!"
#	Otherwise complain
else echo "Sha1 hash does not match!"
# Finish
fi
# Otherwise complain that it does not exist
else echo "Sha1 hash file not found."
# Finish
fi
# Now if not PGP/GPG, but an sha256 instead and the hash file exists
if [ -e "$1.sha256" ]
#	Then calculate the sha1 hash and compare to the hash file; if the same
#	 Then success
then if sha256sum $1 | diff -i - $1.sha256 2> /dev/null
#	 Then success
then echo "Sha256 hash match!"
#	Otherwise complain
else echo "Sha256 hash does not match!"
# Finish
fi
# Otherwise complain that it does not exist
else echo "Sha256 hash file not found."
# Finish
fi
# Quit
exit 0