Add scripts from mblaze/contrib

Directly from tag v6.0, e0733f187b34b21fa8335b9914c29a28fa2e856d.

mblaze/Makefile

@@ -15,20 +15,22 @@
 PREFIX =	${HOME}/.mblaze
 
 BIN =		m mless
+CONTRIB =	contrib/mencrypt contrib/mgpg contrib/msign contrib/mverify
 
 all: ${BIN}
 
 clean:
 	rm -f ${BIN}
 
-install: all env mlesskey mless-key-handler
+install: all env mlesskey mless-key-handler ${CONTRIB}
 	mkdir -pm 700 ${PREFIX}
 	lesskey -o ${PREFIX}/mless mlesskey
 	cp -f env mless-key-handler ${PREFIX}
 	mkdir -p ${PREFIX}/bin
 	cp -f ${BIN} ${PREFIX}/bin
+	cp -f ${CONTRIB} ${PREFIX}/bin
 	cd ${PREFIX}/bin && chmod 555 ${BIN}
 
 uninstall:
-	cd ${PREFIX}/bin && rm -f ${BIN}
+	cd ${PREFIX}/bin && rm -f ${BIN} ${CONTRIB}
 	rm -f ${PREFIX}/env ${PREFIX}/mless ${PREFIX}/mless-key-handler

mblaze/contrib/mencrypt

@@ -0,0 +1,28 @@
+#!/bin/sh
+# mencrypt PLAINMSG - generate a PGP/MIME signed and encrypted message
+
+[ -f "$1" ] || exit 1
+
+IFS='
+'
+FLAGS=$(maddr -a -h from:to:cc:bcc: "$1" |sort -u |sed 's/^/--recipient=/')
+
+FROM=$(maddr -a -h from "$1" | sed 1q)
+[ "$FROM" ] && key="--default-key=$FROM"
+
+TMPD=$(mktemp -d -t mencrypt.XXXXXX)
+trap "rm -rf '$TMPD'" INT TERM EXIT
+
+awk '/^$/,0' "$1" |
+	mmime |
+	gpg2 "$key" --armor --encrypt --sign $FLAGS -o "$TMPD/msg.asc" ||
+	exit $?
+
+printf 'Version: 1\n' >"$TMPD/version"
+
+{
+	sed '/^$/q' "$1"
+	printf '#application/pgp-encrypted %s/version\n' "$TMPD"
+	printf '#application/octet-stream %s/msg.asc\n' "$TMPD"
+} |
+	mmime -t 'multipart/encrypted; protocol="application/pgp-encrypted"'

mblaze/contrib/mgpg

@@ -0,0 +1,20 @@
+#!/bin/sh -e
+
+tmp=$(mktemp -t mgpg.XXXXXX)
+trap "rm -f '$tmp'" INT TERM EXIT
+
+{
+	echo "Content-Type: $PIPE_CONTENTTYPE"
+	echo
+	cat
+} > "$tmp"
+
+n=$(mshow -t "$tmp" | awk -F: '
+	/: application\/pgp-encrypted/ {supported = 1}
+	/: application\/octet-stream/ {if (supported) print $1}')
+
+if [ "$n" ]; then
+	mshow -O "$tmp" "$n" | gpg2 -d 2>&1 || exit 0
+	exit 64
+fi
+exit 63

mblaze/contrib/msign

@@ -0,0 +1,25 @@
+#!/bin/sh
+# msign PLAINMSG - generate a PGP/MIME signed message
+
+[ -f "$1" ] || exit 1
+
+IFS='
+'
+
+TMPD=$(mktemp -d -t msign.XXXXXX)
+trap "rm -rf '$TMPD'" INT TERM EXIT
+
+FROM=$(maddr -a -h from "$1" | sed 1q)
+[ "$FROM" ] && key="--default-key=$FROM"
+
+awk '/^$/,0' "$1" | mmime | sed 's/$/
/' >"$TMPD"/content
+gpg2 $key --armor --detach-sign -o "$TMPD"/signature.asc "$TMPD"/content ||
+	exit $?
+
+{
+	sed '/^$/q' "$1"
+	printf '#mblaze/raw %s/content\n' "$TMPD"
+	printf '#application/pgp-signature %s/signature.asc\n' "$TMPD"
+} |
+	mmime -t 'multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"'
+

mblaze/contrib/mverify

@@ -0,0 +1,34 @@
+#!/bin/sh
+# mverify MSG - verify a OpenPGP or SMIME message
+
+# Needs gpg2 (for OpenPGP) and openssl (for SMIME).
+
+[ "$#" -eq 0 ] && set -- .
+
+mshow -t "$1" | DOS2UNIX='/
$/!s/$/
/' awk -v "msg=$1" '
+{ match($0, "^ *"); indent = RLENGTH }
+$2 == "text/plain" { plain++ }
+$2 == "multipart/signed" { signed = 0+$1; si = indent; next }
+signed && !content && indent == si+2 { content = 0+$1; next }
+signed && content && !signature && indent == si+2 { signature = 0+$1; type = $2 }
+function q(a) { gsub("\\47", "\47\\\47\47", a); return "\47"a"\47" }
+END {
+	if (type == "" && plain) {  // guess plain text armored signature
+		exit(system("mshow -r " q(msg) " | gpg2 --verify"));
+	} else if (type == "") {
+		print("No signature found.")
+		exit(100)
+	} else if (type == "application/pgp-signature") {
+		exit(system("mshow -r -O " q(msg) " " q(content) \
+			" | sed $DOS2UNIX | " \
+			" { mshow -O " q(msg) " " q(signature) \
+			" | gpg2 --verify - /dev/fd/3; } 3<&0"))
+	} else if (type == "application/pkcs7-signature") {
+		exit(system("mshow -r -O " q(msg) " " q(signed) \
+			" | openssl smime -verify"))
+	} else {
+		print("Cannot verify signatures of type " type ".")
+		exit(2)
+	}
+}
+'