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#!/bin/sh for pkg in $* do if [ "$pkg" = "" -o ! -e "$pkg" ]; then echo "no package supplied" 1>&2 exit 1 fi plaintext=`mktemp ${TMPDIR:-/tmp}/tgpg-$$.XXXXXX` detached=`mktemp ${TMPDIR:-/tmp}/tgpg-$$.XXXXXX` # --- Extract detached signature rpm -qp -vv --qf '%{siggpg:armor}' $pkg > $detached # --- Figger the offset of header+payload in the package leadsize=96 o=`expr $leadsize + 8` set `od -j $o -N 8 -t u1 $pkg` il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5` dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9` sigsize=`expr 8 + 16 \* $il + $dl` o=`expr $o + $sigsize + \( 8 - \( $sigsize \% 8 \) \) \% 8` # --- Extract header+payload dd if=$pkg ibs=$o skip=1 2>/dev/null > $plaintext # --- Verify DSA signature using gpg gpg --batch -vv --debug 0xfc02 --verify $detached $plaintext # --- Clean up rm -f $detached $plaintext done
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