tweaks + "docs"

1 files changed, 10 insertions, 9 deletions

diff --git a/badpass b/badpass
index 6a350cf..d5286e4 100755
--- a/badpass
+++ b/badpass
@@ -1,9 +1,13 @@
 #!/bin/sh
 
-# Requires expect
+# A bad password derivation scheme, hopefully portable.
+# Requires `expect' to enable `keychain' key unlocking.
+# Read source for detail.
 
-PREFIX="THIS IS TOTALLY SUPER SECRET"
-PHRASE="THIS IS TOTALLY SUPER SECRET"
+PREFIX="Prepended to every password, usually special chars + uppercase"
+MIDFIX="A not-necessarily-secret string to prevent pre-baked rainbow tables"
+
+echo -n "Master password: "
 
 # Supress echo, and trap exit for correct restoration
 stty -echo
@@ -16,10 +20,7 @@ read -r MASTER
 # Restore state
 stty echo
 trap - EXIT
-
-USEECHO () {
-    echo $1 $2
-}
+echo
 
 USEKEYCHAIN () {
     expect - <<EOF
@@ -30,13 +31,13 @@ expect {
 EOF
 }
 
-CALL=USEECHO
+CALL=echo
 if [ "$1" = "-k" ]; then
     CALL=USEKEYCHAIN
     shift
 fi;
 
 for NAME in "$@"; do
-    PREPASS=$(echo $NAME$PHRASE$MASTER | sha256sum | cut -b -24)
+    PREPASS=$(echo $NAME$MIDFIX$MASTER | sha256sum | cut -b -24)
     $CALL $NAME $PREFIX$PREPASS
 done