initial commit

.gitattributes

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+# Common settings that generally should always be used with your language specific settings
+
+# Auto detect text files and perform LF normalization
+# https://www.davidlaing.com/2012/09/19/customise-your-gitattributes-to-become-a-git-ninja/
+*          text=auto
+
+#
+# The above will handle all files NOT found below
+#
+
+# Documents
+*.bibtex   text diff=bibtex
+*.doc	        diff=astextplain
+*.DOC	        diff=astextplain
+*.docx          diff=astextplain
+*.DOCX          diff=astextplain
+*.dot           diff=astextplain
+*.DOT           diff=astextplain
+*.pdf           diff=astextplain
+*.PDF           diff=astextplain
+*.rtf           diff=astextplain
+*.RTF	        diff=astextplain
+*.md       text
+*.tex      text diff=tex
+*.adoc     text
+*.textile  text
+*.mustache text
+*.csv      text
+*.tab      text
+*.tsv      text
+*.txt      text
+*.sql      text
+
+# Graphics
+*.png      binary
+*.jpg      binary
+*.jpeg     binary
+*.gif      binary
+*.tif      binary
+*.tiff     binary
+*.ico      binary
+# SVG treated as an asset (binary) by default.
+*.svg      text
+# If you want to treat it as binary,
+# use the following line instead.
+# *.svg    binary
+*.eps      binary
+
+# Scripts
+*.bash     text eol=lf
+*.fish     text eol=lf
+*.sh       text eol=lf
+# These are explicitly windows files and should use crlf
+*.bat      text eol=crlf
+*.cmd      text eol=crlf
+*.ps1      text eol=crlf
+
+# Serialisation
+*.json     text
+*.toml     text
+*.xml      text
+*.yaml     text
+*.yml      text
+
+# Archives
+*.7z       binary
+*.gz       binary
+*.tar      binary
+*.tgz      binary
+*.zip      binary
+
+# Text files where line endings should be preserved
+*.patch    -text
+
+#
+# Exclude files from exporting
+#
+
+.gitattributes  export-ignore
+.gitignore      export-ignore
+README.md       export-ignore
+vscode          export-ignore

.gitignore

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+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/numbered-bookmarks.json
+*.code-workspace
+
+# Local History for Visual Studio Code
+.history/

.vscode/numbered-bookmarks.json

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+{
+	"bookmarks": []
+}

README.md

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+# Sub-Resource Integrity Generator Scripts
+
+Basic scripts to generate SRI hashs for a given file. POSIX-compliant shell script for use on *nix and PowerShell for use on Windows.

sri.sh

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+#!/bin/sh
+
+#
+## generate SRI checksums
+#
+
+### text formatting presets
+if command -v tput > /dev/null; then
+    cyan=$(tput setaf 6)
+    err=$(tput bold)$(tput setaf 1)
+    magenta=$(tput setaf 5)
+    norm=$(tput sgr0)
+    ok=$(tput setaf 2)
+else
+    cyan=''
+    err=''
+    magenta=''
+    norm=''
+    ok=''
+fi
+
+### trap
+trap trapExit 1 2 3 6
+
+### functions
+displayError (){
+    printf "\n%sERROR: %s\n" "$err" "$2"
+    printf "Exiting now.%s\n\n" "$norm"
+    exit "$1"
+}
+
+scriptHelp (){
+    printf "\nSeems you need some help?\n\n"
+    exit 0;
+}
+
+trapExit (){
+    printf "\n%sERROR: Caught signal. Exiting.%s\n\n" "$err" "$norm"
+    exit 99
+}
+
+### default variables
+algo='sha384'
+unset filename
+
+### check pre-requisites
+if ! command -v openssl > /dev/null; then
+    displayError 2 'openSSL is not installed'
+fi
+
+### process startup parameters
+if [ -z "$1" ]; then scriptHelp; fi
+while [ $# -gt 0 ]; do
+    case "$1" in
+        -h|-\?|--help)
+            # display script help
+            scriptHelp
+            exit 0
+            ;;
+        -2|--sha256)
+            # generate SRI using sha256
+            algo='sha256'
+            ;;
+        -3|--sha384)
+            # generate SRI using sha384 (default)
+            algo='sha384'
+            ;;
+        -5|--sha512)
+            # generate SRI using sha512
+            algo='sha512'
+            ;;
+        -f|--file)
+            # file for which to generate SRI hash
+            if [ -n "$2" ]; then
+                if [ -f "$2" ]; then
+                    filename="$2"
+                    shift
+                else
+                    displayError 3 "Cannot find file '${2}'."
+                fi
+            else
+                displayError 3 'No filename specified.'
+            fi
+            ;;
+        *)
+            # unknown option
+            printf "\n%sUnknown option: %s.\n" "$err" "$1"
+            printf "%sUse '--help' for valid options.%s\n\n" "$cyan" "$norm"
+            exit 1
+            ;;
+    esac
+    shift
+done
+
+printf "\n%sselected algo: %s%s\n" "$magenta" "$norm" "$algo"
+printf "%sselected file: %s%s%s\n\n" "$magenta" "$norm" "$filename" "$norm"
+
+### do SRI generation
+hash=$( openssl dgst -${algo} -binary "${filename}" | openssl base64 -A) > /dev/null 2>&1
+if [ -z "$hash" ]; then
+    displayError 4 'An error occurred while generating SRI hash.'
+else
+    printf "%sSRI hash: %s%s-%s%s\n\n" "$magenta" "$ok" "$algo" "$hash" "$norm"
+fi
+
+exit 0
+
+
+### error codes
+# 0:    no errors, normal execution
+# 1:    parameter error
+# 2:    cannot find openSSL binary
+# 3:    cannot find specified file for which to generate hash
+# 4:    error occured while executing openssl
+
+#EOF