Decrypt a file with a given private key (best for files encrypted with "encrypt.sh")

decrypt.sh

#!/bin/bash
# Decrypt a file using the specified private key

# Encrypted file
ENCF=$1

# Private key
PRVK=$2

# Decrypted file (defaults to the decrypted file name + ".decrypted")
DECF=${3:-$ENCF.decrypted}

if [ -f "$DECF" ]; then
	echo "File with the decrypted filename already exists"
	exit
fi

openssl rsautl -decrypt -inkey $PRVK -in $ENCF -out $DECF

exit

# To use this:
# sh decrypt.sh /path/to/file.ext.encrypted /path/to/privatekey.pem

# # To give specific name to the decrypted file:
# sh decrypt.sh /path/to/file.ext.encrypted /path/to/privatekey.pem /path/to/decrypted.file