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November 9, 2021 20:09
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🔑 Decrypt shared data
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| #! /bin/bash | |
| KEYS_FILE=gpg_keys.txt | |
| MD5_FILE=md5.txt | |
| INDIR=`pwd` | |
| OUTDIR=`pwd`/outdir | |
| mkdir -p $OUTDIR | |
| # Decrypt and decompress | |
| while read -r SAMPLE KEY; do | |
| echo 'Decrypting' $SAMPLE'.tar.gz.gpg' | |
| echo $KEY | gpg2 --batch --passphrase-fd 0 --armor --decrypt $INDIR/$SAMPLE.tar.gz.gpg > $OUTDIR/$SAMPLE.tar.gz | |
| echo 'Decompressing' $SAMPLE'.tar.gz' | |
| mkdir -p $OUTDIR/$SAMPLE | |
| tar -xvzf $OUTDIR/$SAMPLE.tar.gz -C $OUTDIR/$SAMPLE | |
| done < $KEYS_FILE | |
| echo 'Checking data integrity with md5 checksum' | |
| RESULTS=$OUTDIR/md5_checks.txt | |
| cp $MD5_FILE $OUTDIR/$MD5_FILE | |
| cd $OUTDIR | |
| md5sum -c $MD5_FILE > $RESULTS | |
| # Check all files are OK | |
| if [ `cat $RESULTS | wc -l` -eq `cat $RESULTS | grep OK | wc -l` ]; then | |
| echo 'All files are OK'; | |
| else | |
| echo "" | |
| echo "The following files didn't pass the md5 checksum:" | |
| echo "" | |
| cat $RESULTS | grep -v OK; | |
| fi |
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To share data through unsecure channels, these must be at encrypted (and compressed to be more efficient). And a basic integrity hash should be run to chek that the received data has not been corrupted during the process.
This script: Decrypts, Decompresses and Checks for file integrity.