+#!/bin/bash
+#
+# Date: 2020-02-18T20:06Z
+#
+# Author: Steven Baltakatei Sandoval (baltakatei.com)
+#
+# License: This bash script, 'bkpoe', is licensed under GPLv3 or
+# later by Steven Baltakatei Sandoval:
+#
+# 'bkpoe', a file system proof of existence generator
+# Copyright (C) 2020 Steven Baltakatei Sandoval (baltakatei.com)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# A copy of the GNU General Public License may be found at
+# <https://www.gnu.org/licenses/>.
+#
+# Description: This is a simple script that uses GNU Coreutils
+# OpenTimestamps to generate a proof that permits a user to prove the
+# existence of any individual file within a directory. A proof
+# consists of:
+#
+# - An OpenTimestamps 'ots' file (if '-t' option provided)
+#
+# - Public proof: text file(s) containing a list of salted file
+# hashes.
+#
+# - Private proof: text file(s) containing:
+#
+# - A list of unsalted file hashes
+#
+# - A list of nonces used to generate the list of salted file hashes.
+#
+# - The list of salted file hashes
+#
+# - File attributes (size, relative path)
+#
+# The proof is produced by performing the following steps:
+#
+# - Use 'find' and GNU Coreutils digest algorithms to create
+# numbered lists of file digests at specified directories.
+#
+# - Save these numbered lists of digests into text files within a
+# proof directory.
+#
+# - If more than one specified directory is provided also process
+# the files within the proof directory.
+#
+# - Use OpenTimestamps to create an 'ots' timestamp file
+# for the final digest list file. (if '-t' option provided).
+#
+# - Use OpenTimestamps to upgrade each 'ots' timestamp file after a
+# delay. (if '-w' option provided).
+#
+# Dependencies: coreutils, ots. See end of file
+#
+# Tested on:
+#
+# - GNU/Linux Debian 10
+
+
+# === VARIABLE INITIALIZATION AND FUNCTION DEFINITIONS ===
+
+PATH="/usr/local/bin/:$PATH" # Add default OpenTimestamps path to PATH (necessary if cron used to call this script)
+scriptHostname=$(hostname) # Save hostname of system running this script.
+OTS_TIMEOUT="6h" # maximum time to run `ots --wait` (used via `timeout` command)
+
+# Declare array for storing directories whose contents will be hashed.
+declare -a directoriesToProcess
+
+# Declare arrays for storing file paths, file index, file hashes, file
+# hash nonces, the salted hashes, file sizes, file paths, file
+# modification times, and proof file paths.
+declare -a filePathsFull # array
+declare -a filePathsIndex # array
+declare -a fileHashes # array
+declare -a fileHashNonces # array
+declare -a fileHashesSalted # array
+declare -a fileSizes # array
+declare -a fileModTime # array
+declare -g PROOF_DIRECTORY # global
+declare -ag prvProofPaths # array, global
+declare -ag pubProofPaths # array, global
+
+# Define 'echoerr' function which outputs text to stderr
+ # Note: function copied from https://stackoverflow.com/a/2990533
+echoerr() {
+ echo "$@" 1>&2;
+}
+
+# Define script version.
+SCRIPT_VERSION="bkpoe 0.1.0"
+
+# Save current date.
+runDate=$(date +%Y%m%dT%H%M%S%z)
+sleep 1 # Space out program run times by at least one second.
+###echoerr "DEBUG: Current date is:"$runDate
+
+# Save working directory
+runPath=$(pwd)
+###echoerr "DEBUG: Current working directory is:"$runPath
+
+# Define proof directory basename
+PROOF_DIRECTORY_BASE="$runDate""..""$scriptHostname""_bkpoe_proofs"
+
+# Define default proof directory
+PROOF_DIRECTORY="$runPath"/"$PROOF_DIRECTORY_BASE"
+
+# Print information on how to use this bash script.
+usage() {
+
+ echo "USAGE:"
+ echo " bkpoe [ options ] DIRECTORIES"
+ echo
+ echo "OPTIONS:"
+ echo " -h, --help"
+ echo " Display help information."
+ echo
+ echo " -r, --recursive"
+ echo " Perform recursive hashing of directories."
+ echo
+ echo " -v, --verbose"
+ echo " Display debugging info."
+ echo
+ echo " -a, --algorithm [ algo ]"
+ echo " Specify GNU Coreutils hash command. Options include: "
+ echo " b2sum md5sum sha1sum sha224sum sha256sum sha384sum "
+ echo " sha512sum"
+ echo
+ echo " -m, --message [ string ]"
+ echo " Specify message to be included in filehash files."
+ echo
+ echo " -d, --delimiter [ string ]"
+ echo " Specify character to serve as delimiter in proof files. "
+ echo " (Default: ,) "
+ echo " -t, --timestamp"
+ echo " Create openTimestmaps proof file."
+ echo " -w, --wait"
+ echo " Pass '--wait' option to OpenTimestamps to 'wait "
+ echo " until a complete timestamp committed in the "
+ echo " Bitcoin blockchain is available instead of "
+ echo " returning immediately. "
+ echo " -o, --output"
+ echo " Specify output directory to save proof. Default is working"
+ echo " directory where script was run."
+}
+
+
+# Check that a string matches one of GNU Coreutils hash commands.
+isValidDigestAlgo() {
+ # Syntax: isValidDigestAlgo [string]
+ # Description: Returns 1 if [string] is a valid GNU Coreutils hash function command. Returns 0 otherwise.
+
+ # Exit if more than one argument provided.
+ ###echoerr "DEBUG: Arguments provided to isValidDigestAlgo() are:$@"
+ if [[ $# -ne 1 ]]; then
+ echoerr "ERROR: Illegal number of digest arguments provided."
+ exit 1
+ fi
+
+ # Exit if argument contains non-alphanumeric characters
+ if [[ "$@" =~ [^a-zA-Z0-9$] ]]; then
+ echoerr "ERROR: Illegal characters for digest argument provided."
+ exit 1
+ fi
+
+ local input=$1 #Save first argument provided to function as input for further processing.
+
+ ###echoerr "DEBUG: Starting function to check validity of string as valid digest command."
+
+ # Define array of valid hash algorithm commands present in by GNU coreutils package. List is current as of Debian Buster. List taken from https://packages.debian.org/buster/amd64/coreutils/filelist ).
+ local gnuCoreutilsAlgos=(b2sum md5sum sha1sum sha224sum sha256sum sha384sum sha512sum)
+ ###echoerr "DEBUG:Contents of \$gnuCoreutilsAlgos array is:${gnuCoreutilsAlgos[@]}"
+
+ # Make input string lowercase
+ #input=${input,,} # Make all letters in $1 lowercase (see https://stackoverflow.com/questions/2264428/how-to-convert-a-string-to-lower-case-in-bash ) and save as $input
+ ###echoerr "DEBUG: User-specified hash algorithm is:$input"
+
+ # Return true (0) if $gnuCoreutilsAlgos array contains string $input (see https://unix.stackexchange.com/a/177139 )
+ for item in "${gnuCoreutilsAlgos[@]}"; do
+ ###echoerr "DEBUG: \$item is:$item"
+ ###echoerr "DEBUG: \$input is:$input"
+ if [ "$input" == "$item" ]; then
+ ###echoerr "DEBUG: $input present in \$gnuCoreutilsAlgos array."
+ return 0
+ fi
+ done
+
+ # Return false (1) otherwise.
+ echoerr "DEBUG: $input not recognized as valid hash algorithm name."
+ return 1
+}
+
+writeProofs() {
+ # Syntax: writeProofs [ loopIndex ] [ dirPath ]
+
+ # Description: Construct private and public proofs for files
+ # contained within [ dirPath ]. Save file with date, [ loopIndex ],
+ # and base directory name within filename.
+
+ # Required variables:
+ # - $runDate: used in creating proof directory
+ # - $PROOF_DIRECTORY: used as directory where proof files are saved
+ # - $OPTION_ALGORITHM: used to decide which hash algorithm to use
+ # - $OPTION_DELIMITER: used to determine which char to use as a delimiter in proof files
+ # - $OPTION_MESSAGE: used to determine message included in proof files
+ # - $OPTION_RECURSIVE: used to determine if files within subdirectories under [ dir Path ] directory should be included
+
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG:This is the writeProofs() function. Provided arguments are:$@"
+
+ # Determine scope of 'find' file search (recursive search or not)
+ if [[ $OPTION_RECURSIVE == "true" ]]; then
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: Performing recursive file search on directory $directoryToHash"
+ findMaxDepthOption="" # Do not specify -maxdepth option for find (causes 'find' to include all files recursively within [ dirPath ]
+ else
+ findMaxDepthOption="-maxdepth 1" # Specify "-maxdepth 1 " as option for 'find' so only files immediately within [ dirPath ] directory are included (no subdirectories).
+ fi
+
+ # Save current date of loop
+ proofLoopRunDate=$(date +%Y%m%dT%H%M%S%z)
+ ###echoerr "DEBUG: Date and time of current loop is:"$proofLoopRunDate
+
+ # Reset arrays.
+ filePathsFull=()
+ filePathsIndex=()
+ fileHashes=()
+ fileHashNonces=()
+ fileHashesSalted=()
+ fileSizes=()
+ fileModTime=()
+
+ # Pass first argument provided to function as directory index.
+ local loopIndex=$1
+
+ # Pass second argument as directory to process
+ if [[ -d $2 ]]; then
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: Valid directory argument provided to writeProofs() function."
+ local directoryToHash=$2
+ ## local directoryToHash=$(readlink -f $2) # Use absolutely full path (not used for privacy).
+ else
+ echoerr "ERROR: Invalid directory argument provided to writeProofs() function."
+ exit 1
+ fi
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG:Processing directory:"$directoryToHash
+ local directoryToHashShort="$(basename "$directoryToHash")"
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG:Directory basename:"$directoryToHashShort
+
+ # Populate filePathsFull array with file paths from 'find' results (see https://stackoverflow.com/a/54561526 ).
+ # Note: For creating array from output of find via readarray, see https://unix.stackexchange.com/a/263885
+ # Note: For sorting output of find, see https://unix.stackexchange.com/a/34328
+ readarray -d '' filePathsFull < <(find $directoryToHash $findMaxDepthOption -readable -type f -print0 | sort -z) # Populate filePathsFull array with sorted list of files present in $directoryToHash (and subdirectories if $OPTION_RECURSIVE set to 'true'.
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: The ${#filePathsFull[@]} elements of filePathsFull array are:${filePathsFull[@]}" # Show array length (see https://www.cyberciti.biz/faq/finding-bash-shell-array-length-elements/ )
+
+ # Construct index array from filePathsFull array for the for loops used to write proofs.
+ filePathsIndex=(${!filePathsFull[@]})
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: The ${#filePathsIndex[@]} elements of filePathsIndex array are:${filePathsIndex[@]}"
+
+ # Populate fileHashes with hashes of files listed in filePathsFull array
+ # Iterate through all elements of filePathsFull array using an integer index. (see https://stackoverflow.com/a/6723516 )
+ for i in "${!filePathsIndex[@]}"; do
+ ###[[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG:The $i th element of the filePathsFull array is:${filePathsFull[i]}"
+ fileHashes[i]=$($OPTION_ALGORITHM "${filePathsFull[i]}" | awk '{ print $1 }') # Get hash value from GNU Coreutils hash command (see https://stackoverflow.com/a/3679803 )
+ done
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: The ${#fileHashes[@]} elements of fileHashes array are:${fileHashes[@]}"
+
+ # Populate fileHashNonces array with same number of elements as filePathsFull array. Each element is a random hexadecimal nonce of length matching OPTION_ALGORITHM. Hex nonce generated from 64-byte (512-bits) block from /dev/urandom.
+ for i in "${!filePathsIndex[@]}"; do
+ fileHashNonces[i]=$(dd bs=64 count=1 if=/dev/urandom 2>/dev/null | $OPTION_ALGORITHM | awk '{ print $1 }')
+ done
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: The ${#fileHashNonces[@]} elements of fileHashNonces array are:${fileHashNonces[@]}"
+
+ # Populate fileHashesSalted array with salted digest for each file hash corresponding nonce.
+ for i in "${!filePathsIndex[@]}"; do
+ fileHashesSalted[i]=$(echo -n "${fileHashes[i]}${fileHashNonces[i]}" | $OPTION_ALGORITHM | awk '{ print $1 }')
+ done
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: The ${#fileHashesSalted[@]} elements of fileHashesSalted array are:${fileHashesSalted[@]}"
+
+ # Populate fileSizes array with file sizes (in bytes).
+ for i in "${!filePathsIndex[@]}"; do
+ fileSizes[i]=$(wc -c "${filePathsFull[i]}" | awk '{ print $1 }')
+ done
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: The ${#fileSizes[@]} elements of fileSizes array are:${fileSizes[@]}"
+
+ # Populate fileModTime array with file modification times (in ISO-8601 format)
+ for i in "${!filePathsIndex[@]}"; do
+ fileModTime[i]=$(date --iso-8601=seconds -r "${filePathsFull[i]}" | awk '{ print $1 }')
+ done
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: The ${#fileModTime[@]} elements of fileModTime array are:${fileModTime[@]}"
+
+ # ==== GENERATE PROOF FILES FROM HASH LIST(S) ====
+
+ # Define output file names and paths.
+ local PROOF_PRIVATE_FILENAME=$proofLoopRunDate"_"$loopIndex"_prv.."$scriptHostname"_"$directoryToHashShort"_"$OPTION_ALGORITHM"_proof_private.txt"
+ local PROOF_PUBLIC_FILENAME=$proofLoopRunDate"_"$loopIndex"_pub.."$scriptHostname"_"$directoryToHashShort"_"$OPTION_ALGORITHM"_proof_public.txt"
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: \$PROOF_PRIVATE_FILENAME is $PROOF_PRIVATE_FILENAME"
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: \$PROOF_PUBLIC_FILENAME is $PROOF_PUBLIC_FILENAME"
+ PROOF_PRIVATE_FILEPATH="$PROOF_DIRECTORY"/"$PROOF_PRIVATE_FILENAME"
+ PROOF_PUBLIC_FILEPATH="$PROOF_DIRECTORY"/"$PROOF_PUBLIC_FILENAME"
+
+ # Create private proof and public proof files.
+ touch "$PROOF_PRIVATE_FILEPATH"
+ touch "$PROOF_PUBLIC_FILEPATH"
+
+ # Abbreviate OPTION_DELIMITER to local variable DELIM
+ local DELIM=$OPTION_DELIMITER
+
+ # Define private proof first-line headers (date, version, algorithm, message)
+ local PROOF_PRIVATE_HEADER1="$proofLoopRunDate$DELIM$SCRIPT_VERSION$DELIM$OPTION_ALGORITHM$DELIM$OPTION_MESSAGE"
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: \$PROOF_PRIVATE_HEADER1 is $PROOF_PRIVATE_HEADER1"
+ # Define public proof first-line headers (date, version, algorithm, message)
+ local PROOF_PUBLIC_HEADER1="$proofLoopRunDate$DELIM$SCRIPT_VERSION$DELIM$OPTION_ALGORITHM$DELIM$OPTION_MESSAGE"
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: \$PROOF_PUBLIC_HEADER1 is $PROOF_PUBLIC_HEADER1"
+
+ # Define private proof second-line column labels (index, digest, nonce, salted digest, mdate, size, filepath)
+ local PROOF_PRIVATE_HEADER2="index"$DELIM"digest"$DELIM"nonce"$DELIM"digest_salted"$DELIM"mdate"$DELIM"size_bytes"$DELIM"file_path"
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: \$PROOF_PRIVATE_HEADER2 is $PROOF_PRIVATE_HEADER2"
+ # Define public proof second-line column labels (index, salted digest)
+ local PROOF_PUBLIC_HEADER2="index"$DELIM"digest_salted"
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: \$PROOF_PUBLIC_HEADER2 is $PROOF_PUBLIC_HEADER2"
+
+ # Write headers to proof files
+ echo $PROOF_PRIVATE_HEADER1 >> "$PROOF_PRIVATE_FILEPATH"
+ echo $PROOF_PRIVATE_HEADER2 >> "$PROOF_PRIVATE_FILEPATH"
+ echo $PROOF_PUBLIC_HEADER1 >> "$PROOF_PUBLIC_FILEPATH"
+ echo $PROOF_PUBLIC_HEADER2 >> "$PROOF_PUBLIC_FILEPATH"
+
+ # Loop to append array contents.
+ for i in "${!filePathsIndex[@]}"; do
+ # Append to private proof: filePathsIndex[i],fileHashes[i],fileHashNonces[i],fileHashesSalted[i],fileModTime[i],fileSizes[i],filePathsFull[i]
+ ###[[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: Writing line to $PROOF_PRIVATE_FILEPATH"
+ echo ${filePathsIndex[i]}$DELIM${fileHashes[i]}$DELIM${fileHashNonces[i]}$DELIM${fileHashesSalted[i]}$DELIM${fileModTime[i]}$DELIM${fileSizes[i]}$DELIM${filePathsFull[i]} >> "$PROOF_PRIVATE_FILEPATH"
+ # Append to public proof: filePathsIndex[i],fileHashesSalted[i]
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: Writing line to $PROOF_PUBLIC_FILEPATH"
+ echo ${filePathsIndex[i]}$DELIM${fileHashesSalted[i]} >> $PROOF_PUBLIC_FILEPATH
+ done
+
+ # Save file paths to global variables prvProofPaths and pubProofPaths to allow other functions to manipulate files.
+ prvProofPaths+=($PROOF_PRIVATE_FILEPATH)
+ pubProofPaths+=($PROOF_PUBLIC_FILEPATH)
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: The ${#prvProofPaths[@]} elements of prvProofPaths array are:${prvProofPaths[@]}"
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: The ${#pubProofPaths[@]} elements of pubProofPaths array are:${pubProofPaths[@]}"
+
+ # Reset arrays.
+ filePathsFull=()
+ filePathsIndex=()
+ fileHashes=()
+ fileHashNonces=()
+ fileHashesSalted=()
+ fileSizes=()
+ fileModTime=()
+}
+
+
+# === INPUT PROCESSING ===
+# Check for presence of options.
+###echoerr "DEBUG: === INPUT PROCESSING START ==="
+
+# Process initial option arguments (see https://jonalmeida.com/posts/2013/05/26/different-ways-to-implement-flags-in-bash/ and https://likegeeks.com/linux-bash-scripting-awesome-guide-part3/ )
+while [ ! $# -eq 0 ] # While number of arguments ($#) is not (!) equal to (-eq) zero (0).
+do
+ case "$1" in # Check first of remaining arguments to see if it matches one of strings below.
+ --help | -h)
+ # Code to run if $1 matched "--help" or "-h":
+ ###echoerr "DEBUG: This is the help information."
+ usage # Run usage function to display helpful info to user.
+ exit 1
+ ;;
+ --recursive | -r)
+ # Code to run if $1 matched "--recursive" or "-r":
+ ###echoerr "DEBUG: Recursive option activated."
+ OPTION_RECURSIVE="true"
+ ;;
+ --verbose | -v)
+ # Code to run if $1 matched "--verbose" or "-v":
+ ###echoerr "DEBUG: Verbose option activated."
+ OPTION_VERBOSE="true"
+ ;;
+ --algorithm | -a)
+ # Code to run if $1 matched "--algorithm" or "-a":
+
+ ###echoerr "DEBUG: Selecting hash algorithm."
+ # Check that OPTION_ALGORITHM variable hasn't already been set.
+ # Check that OPTION_ALGORITHM contains only alphanumeric characters.
+ # Check that argument following '-a' or '--algorithm' ($2) is valid algorithm.
+ if [[ ! -v OPTION_ALGORITHM ]] && [[ ! "$2" =~ [^a-zA-Z0-9$] ]] && isValidDigestAlgo $2; then
+ ###echoerr "DEBUG: Valid hash algorithm provided."
+ OPTION_ALGORITHM=$2 # Save argument following '-a' or '--algorithm' to $OPTION_ALGORITHM
+ shift # Remove an additional argument so the additional algorithm argument $2 is properly removed at the end of the while loop.
+ else
+ echoerr "ERROR: Invalid hash algorithm argument provided:""$2"
+ exit 1
+ fi
+ ;;
+ --message | -m)
+ # Code to run if $1 matched "--message" or "-m":
+ ###echoerr "DEBUG: Specifying header message."
+ # Check that OPTION_MESSAGE variable hasn't already been set.
+ if [[ ! -v OPTION_MESSAGE ]]; then
+ OPTION_MESSAGE=$2 # Save argument following '-m' or '--message' to $OPTION_MESSAGE
+ shift # Remove an additional argument so the additional algorithm argument $2 is properly removed at the end of the while loop.
+ fi
+ ;;
+ --delimiter | -d)
+ # Code to run if $1 matched "--delimiter" or "-d":
+ ###echoerr "DEBUG: Specifying delimiter."
+ # Check that OPTION_DELIMITER variable hasn't already been set.
+ if [[ ! -v OPTION_DELIMITER ]]; then
+ OPTION_DELIMITER=$2 # Save argument following '-d' or '--delimiter' to $OPTION_DELIMITER
+ shift # Remove an additional argument so the additional delimiter argument $2 is properly removed at the end of the while loop.
+ fi
+ ;;
+ --timestamp | -t)
+ # Code to run if $1 matched "--timestamp" or "-t":
+ echoerr "DEBUG: OpenTimestamps option selected."
+ # Check that ots command exists. (see https://stackoverflow.com/a/677212 )
+ if command -v ots >/dev/null 2>&1 ; then
+ echoerr "DEBUG: OpenTimestampscommand ('ots') detected."
+ OPTION_OPENTIMESTAMPS="true"
+ else
+ echo >&2 "I require the ots (OpenTimestamps) command but it's not installed. Aborting."
+ exit 1
+ fi
+ ;;
+ --wait | -w)
+ # Code to run if $1 matched "--wait" or "-w":
+ echoerr "DEBUG: OpenTimestamps '--wait' option selected."
+ OPTION_OPENTIMESTAMPS_WAIT="true"
+ ;;
+ --output | -o)
+ # Code to run if $1 matched "--output" or "-o":
+ # Check that argument $2 is a directory.
+ if [[ -d $2 ]]; then
+ echoerr "DEBUG: Specified ""$PROOF_DIRECTORY_BASE"" in ""$2"" as directory for saving proof files."
+ PROOF_DIRECTORY="$2"/"$PROOF_DIRECTORY_BASE"
+ echoerr "DEBUG: Proof Directory is:""$PROOF_DIRECTORY"
+ shift # Remove an additional argument so the additional delimiter argument $2 is properly removed at the end of the while loop.
+ else
+ echoerr "ERROR: Invalid argument provided as output directory for proof files:""$2"
+ exit 1
+ fi
+ ;;
+ *)
+ # Code to run if $1 isn't any of the above cases:
+ # Check that remaining argument is a directory.
+ if [[ -d $1 ]]; then
+ ###echoerr "DEBUG: Remaining argument is directory. Adding to \$directoriesToProcess array."
+ # Add directory argument $1 to directory array
+ directoriesToProcess+=($1) # (see https://stackoverflow.com/a/1951523 )
+ else
+ echoerr "ERROR: Remaining argument is not a directory or valid option. Exiting."
+ exit 1
+ fi
+ ;;
+ esac
+ shift # Remove first argument ($1) so remaining arguments can be processed on next loop.
+done
+
+# If OPTION_ALGORITHM is not set then set it to 'sha256sum' by default.
+if [[ ! -v OPTION_ALGORITHM ]]; then
+ echoerr "DEBUG: No hash algorithm set. Defaulting to sha256sum."
+ OPTION_ALGORITHM="sha256sum"
+fi
+
+# If OPTION_DELIMITER is not set then set it to ',' by default.
+if [[ ! -v OPTION_DELIMITER ]]; then
+ ###echoerr "DEBUG: No delimiter set. Defaulting to ','."
+ OPTION_DELIMITER=","
+fi
+
+# Exit program if directoriesToProcess array is empty.
+if [[ ${#directoriesToProcess[@]} -eq 0 ]]; then
+ echoerr "ERROR: No valid directory specified."
+ exit 1
+fi
+
+###echoerr "DEBUG: === INPUT PROCESSING END ==="
+
+# === MAIN PROGRAM ===
+[[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: === MAIN PROGRAM START ==="
+[[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: Verbose option active."
+[[ $OPTION_VERBOSE == "true" ]] && [[ $OPTION_RECURSIVE == "true" ]] && echoerr "DEBUG: Recursive option active."
+[[ $OPTION_VERBOSE == "true" ]] && [[ -v OPTION_ALGORITHM ]] && echoerr "DEBUG: Selected Hash algorithm is:""$OPTION_ALGORITHM"
+[[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: Directories to process are: ${directoriesToProcess[@]}"
+[[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: Message to add to proof is: $OPTION_MESSAGE"
+[[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: Proof directory is:""$PROOF_DIRECTORY"
+[[ $OPTION_VERBOSE == "true" ]] && [[ $OPTION_OPENTIMESTAMPS == "true" ]] && echoerr "DEBUG: OpenTimestamps option active."
+[[ $OPTION_VERBOSE == "true" ]] && [[ $OPTION_OPENTIMESTAMPS_WAIT == "true" ]] && echoerr "DEBUG: OpenTimestamps '--wait' option selected."
+# Create proof directory
+mkdir "$PROOF_DIRECTORY"
+echoerr "Proof directory created at:""$PROOF_DIRECTORY"
+
+## TEMP REF:
+# declare -a filePathsFull # array
+# declare -a filePathsIndex # array
+# declare -a fileHashes # array
+# declare -a fileHashNonces # array
+# declare -a fileHashesSalted # array
+# declare -a fileSizes # array
+# declare -a fileModTime # array
+# declare -ag prvProofPaths # array, global
+# declare -ag pubProofPaths # array, global
+
+# ==== GENERATE HASH LIST(S) ====
+[[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: ==== GENERATING HASH LIST(S) ===="
+
+# Assemble and write proofs to disk for all specified directories.
+
+# Generate proofs from all provided directories.
+for j in "${!directoriesToProcess[@]}"; do
+ writeProofs $j "${directoriesToProcess[j]}"
+done
+
+# Decide if superproof is required.
+if [[ ${#directoriesToProcess[@]} -eq 1 ]]; then
+ # If only one directory provided then no further proofs required.
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: Only 1 directory processed. No superproof required."
+elif [[ ${#directoriesToProcess[@]} -gt 1 ]]; then
+ # If multiple directories provided then create superproof from files in PROOF_DIRECTORY.
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: More than 1 directory processed. Proceeding to generate superproof from PROOF_DIRECTORY."
+ writeProofs "S" $PROOF_DIRECTORY # Create proof using proof files which are stored in PROOF_DIRECTORY
+fi
+
+# ==== GENERATE HASH LIST(S) REPORT =====
+echoerr "Proof files written to $PROOF_DIRECTORY directory:"
+for i in ${!prvProofPaths[@]}; do
+ echo $(basename "${prvProofPaths[i]}")
+ echo $(basename "${pubProofPaths[i]}")
+done
+
+# ==== GENERATE OPENTIMESTAMPS TIMESTAMP FILE(S) ====
+
+# Determine if OpenTimestamp actions to be performed.
+if [[ $OPTION_OPENTIMESTAMPS == "true" ]]; then
+ # Identify target for OpenTimeStamps script.
+ otsTarget=${pubProofPaths[-1]} # Select final element in pubProofPaths array as target for 'ots' command.
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: otsTarget is:""$otsTarget"
+
+ # Set wait option as determined by OPTION_OPENTIMESTAMPS_WAIT variable. Set timeout length.
+ if [[ $OPTION_OPENTIMESTAMPS_WAIT == "true" ]]; then
+ otsWaitOption="--wait" # Specify '--wait' option for ots command.
+ otsWaitTimeCmd="timeout ""$OTS_TIMEOUT" # Specify timeout length (6 hours) for ots command.
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: OpenTimestamps '--wait' option active."
+ else
+ otsWaitOption=""
+ otsWaitTimeCmd=""
+ [[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: OpenTimestamps '--wait' option not active."
+ fi
+
+ # Generate OpenTimeStamps proof file.
+ pushd "$PROOF_DIRECTORY" 1>/dev/null 2>/dev/null # temporarily change working dir to PROOF_DIRECTORY, suppress stdout and stderr
+ $otsWaitTimeCmd ots $otsWaitOption stamp $otsTarget
+ echoerr "OpenTimestamps operation successful! $otsTarget created."
+ echoerr "Use 'ots info [ filename ]' for more info."
+ echoerr "Use 'ots upgrade' if '--wait' option not used to make .ots file independently-verifiable."
+ echoerr "See https://opentimestamps.org/ for more information."
+ popd 1>/dev/null 2>/dev/null # reverse temporary change to working dir, suppress stdout and stderr
+
+fi
+
+
+[[ $OPTION_VERBOSE == "true" ]] && echoerr "DEBUG: === MAIN PROGRAM END ==="
+# Exit program successfully.
+exit 0
+
+
+# == Dependencies ==
+#
+# - bash, find, sort, echo, mkdir, basename, awk, wc, date, dd,
+# readlink, touch, ots,
+
+# - GNU bash, version 5.0.3(1)-release (x86_64-pc-linux-gnu)
+# Copyright (C) 2019 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
+# This is free software; you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+
+# - find (GNU findutils) 4.6.0.225-235f
+# Copyright (C) 2019 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+# This is free software: you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+# Written by Eric B. Decker, James Youngman, and Kevin Dalley.
+# Features enabled: D_TYPE O_NOFOLLOW(enabled) LEAF_OPTIMISATION FTS(FTS_CWDFD) CBO(level=2)
+
+# - sort (GNU coreutils) 8.30
+# Copyright (C) 2018 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+# This is free software: you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+# Written by Mike Haertel and Paul Eggert.
+
+# - echo (GNU coreutils) 8.30
+# Copyright (C) 2018 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+# This is free software: you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+# Written by Brian Fox and Chet Ramey.
+
+# - mkdir (GNU coreutils) 8.30
+# Copyright (C) 2018 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+# This is free software: you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+# Written by David MacKenzie.
+
+# - basename (GNU coreutils) 8.30
+# Copyright (C) 2018 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+# This is free software: you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+# Written by David MacKenzie.
+
+# - GNU Awk 4.2.1, API: 2.0 (GNU MPFR 4.0.2, GNU MP 6.1.2)
+# Copyright (C) 1989, 1991-2018 Free Software Foundation.
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see http://www.gnu.org/licenses/.
+
+# - wc (GNU coreutils) 8.30
+# Copyright (C) 2018 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+# This is free software: you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+# Written by Paul Rubin and David MacKenzie.
+
+# - date (GNU coreutils) 8.30
+# Copyright (C) 2018 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+# This is free software: you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+# Written by David MacKenzie.
+
+# - dd (coreutils) 8.30
+# Copyright (C) 2018 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+# This is free software: you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+# Written by Paul Rubin, David MacKenzie, and Stuart Kemp.
+
+# - readlink (GNU coreutils) 8.30
+# Copyright (C) 2018 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+# This is free software: you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+# Written by Dmitry V. Levin.
+
+# - touch (GNU coreutils) 8.30
+# Copyright (C) 2018 Free Software Foundation, Inc.
+# License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+# This is free software: you are free to change and redistribute it.
+# There is NO WARRANTY, to the extent permitted by law.
+# Written by Paul Rubin, Arnold Robbins, Jim Kingdon,
+# David MacKenzie, and Randy Smith.
+
+# - ots v0.7.0 ( https://github.com/opentimestamps/opentimestamps-client )
+# The OpenTimestamps Client is free software: you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or (at your
+# option) any later version.
+# The OpenTimestamps Client is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+# below for more details.
projects / BK-2020-03.git / commitdiff