diff --git a/bin/key-check b/bin/key-check
new file mode 100755
index 0000000..07c84a3
--- /dev/null
+++ b/bin/key-check
@@ -0,0 +1,114 @@
+#!/bin/bash
+
+trap "exit 1" TERM
+export TOP_PID=$$
+
+readonly PROGRAM_NAME=$(basename $0)
+readonly PROGRAM_LOC=$(readlink -m $(dirname $0))
+readonly ARGS="$@"
+readonly ARG_COUNT="$#"
+
+error () {
+  local readonly message=$1; shift
+
+  echo $message
+  echo
+
+  exit 1
+}
+
+file_error () {
+  local readonly file=$1; shift
+
+  error "File $file does not exist"
+}
+
+hash_error () {
+  local readonly file=$1; shift
+  local readonly cert_type=$1; shift
+
+  error "File $file is not a $cert_type file"
+}
+
+usage () {
+  echo usage: $POGRAM_NAME CERTIFICATE_FILE KEY_FILE CSR_FILE
+  exit 0
+}
+
+md5 () {
+  local readonly modulus=$1; shift
+
+  echo $modulus \
+    | openssl md5
+}
+
+hash_certificate () {
+  local readonly certificate=$1; shift
+  out=$( openssl x509 -noout -modulus -in $certificate 2>/dev/null )
+
+  if [ $? -ne 0 ]; then
+    hash_error $certificate certificate
+  fi
+
+  echo $(md5 $out)
+}
+
+hash_key () {
+  local readonly key=$1; shift
+  out=$( openssl rsa -noout -modulus -in $key 2>/dev/null )
+
+  if [ $? -ne 0 ]; then
+    hash_error $key key
+  fi
+
+  echo $(md5 $out)
+}
+
+hash_csr () {
+  local readonly csr=$1; shift
+  out=$( openssl req -noout -modulus -in $csr 2>/dev/null )
+
+  if [ $? -ne 0 ]; then
+    hash_error $csr csr
+  fi
+
+  echo $(md5 $out)
+}
+
+incorrect_number_of_arguments () {
+  test $ARG_COUNT -ne 3
+}
+
+is_file () {
+  local readonly file=$1
+
+  [[ -f $file ]]
+}
+
+main () {
+  local readonly certificate=$1; shift
+  local readonly key=$1; shift
+  local readonly csr=$1; shift
+
+  if incorrect_number_of_arguments; then
+    usage
+  fi
+
+  if ! is_file $certificate; then
+    file_error $certificate
+  fi
+
+  if ! is_file $key; then
+    file_error $key
+  fi
+
+  if ! is_file $csr; then
+    file_error $csr
+  fi
+
+  echo $(hash_certificate $certificate)
+  echo $(hash_key $key)
+  echo $(hash_csr $csr)
+}
+
+main $ARGS