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Create and sign your safari extension file
XAR=path/to/xar/bin
BUILD_DIR=path/to/dir/with/cert/files
EXTENSION=your extension name
$XAR -czf $EXTENSION.safariextz --distribution $EXTENSION.safariextension
$XAR --sign -f $EXTENSION.safariextz --digestinfo-to-sign digest.dat --sig-size `cat $BUILD_DIR/size.txt` --cert-loc $BUILD_DIR/cert.der --cert-loc $BUILD_DIR/cert01 --cert-loc $BUILD_DIR/cert02
openssl rsautl -sign -inkey $BUILD_DIR/key.pem -in digest.dat -out sig.dat
$XAR --inject-sig sig.dat -f $EXTENSION.safariextz
rm -f sig.dat digest.dat
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