From c8737dab6a84e089d4ae3c94d8630c8749218212 Mon Sep 17 00:00:00 2001
From: Christian Ulrich <christian@ulrich.earth>
Date: Mon, 20 Apr 2020 20:22:54 +0200
Subject: [PATCH] add import_ssh_key.sh

---
 encryption/import_ssh_key.sh | 88 ++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100755 encryption/import_ssh_key.sh

diff --git a/encryption/import_ssh_key.sh b/encryption/import_ssh_key.sh
new file mode 100755
index 0000000..bab8607
--- /dev/null
+++ b/encryption/import_ssh_key.sh
@@ -0,0 +1,88 @@
+#!/bin/sh
+
+function help {
+  echo "NAME"
+  echo "  $(basename $0) - import an OpenSSH key from a file or from stdin"
+  echo ""
+  echo "SYNOPSYS"
+  echo "  $(basename $0) -n NAME [-f FILE]"
+  echo ""
+  echo "OPTIONS"
+  echo "  -n, --name=KEYNAME"
+  echo "    The key name, e.g. \"id\", which would result in a private key file ~/.ssh/id_rsa,"
+  echo "    ~/.ssh/id_dsa, ~/.ssh/id_ecdsa or .ssh/id_ed25519 (depending on the key type)."
+  echo ""
+  echo "  -f, --file=FILE"
+  echo "    The file containing the private key that will be imported. If this option is not"
+  echo "    specified, the private key will be read from stdin."
+  echo ""
+  echo "  -h, --help"
+  echo "    Display this help message."
+  echo ""
+  echo "AUTHOR"
+  echo "  Written by Christian Ulrich, christian@ulrich.earth"
+}
+
+function import {
+  local private_key="$1"
+  local name="$2"
+
+  local public_key=$(ssh-keygen -yf /dev/stdin <<< $private_key)
+  local type=$(
+    ssh-keygen -lf /dev/stdin <<< $public_key |
+    rev |
+    cut -d" " -f1 |
+    rev |
+    tr -d '()' | 
+    tr '[:upper:]' '[:lower:]')
+  local private_key_file=~/.ssh/${name}_${type}
+  local public_key_file=~/.ssh/${name}_${type}.pub
+  echo "$private_key" > $private_key_file
+  chmod 0600 $private_key_file
+  echo "$public_key" > $public_key_file
+  chmod 0644 $public_key_file
+  echo "Successfully imported key."
+  echo "Private key stored at ${private_key_file}"
+  echo "Public key stored at ${public_key_file}"
+}
+
+function main {
+  while [[ $# -gt 0 ]]; do
+    local opt="$1"
+    case $opt in
+      -n|--name)
+	local name="$2"
+	shift
+      	shift
+	;;
+      -f|--file)
+        local file_path="$2"
+	shift
+	shift
+	;;
+      -h|--help)
+	help
+	return 0
+	;;
+      *)
+	help
+	return 1
+    esac
+  done
+
+  if [ -z "$name" ]; then
+    help
+    return 1
+  fi
+
+  if [ -z "$file_path" ]; then
+    local private_key=$(</dev/stdin)
+  else
+    local private_key=$(<$file_path)
+  fi
+ 
+  import "$private_key" "$name"
+}
+
+set -e
+main "$@"