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