Creating a framework from the skeleton.: XML Security Library Reference Manual

Creating a framework from the skeleton.

The XML Security Library contains a "skeleton" for creating new "xmlsec-<crypto>" libraries. In order to create "xmlsec-mycrypto" library framework, do the following (this example assumes that you are using *nix system, adjust the commands if you are using something else):

Copy src/skeleton and include/xmlsec/skeleton folders to src/mycrypto and include/xmlsec/mycrypto folders:
Example 25. Coping skeleton folders:
```
cp -r src/skeleton src/mycrypto
cp -r include/xmlsec/skeleton include/xmlsec/mycrypto
	    
```

Replace "skeleton" with "mycrypto" in the copied files (note that there are different possible cases here):

Example 26. Replacing "skeleton" with "mycrypto".

for i in `ls include/xmlsec/mycrypto/* src/mycrypto/*`;  do 
    echo Processing $i ..;
    sed 's/skeleton/mycrypto/g' $i | \
    sed 's/SKELETON/MYCRYPTO/g' | \
    sed 's/Skeleton/MyCrypto/g' > $i.tmp;
    mv $i.tmp $i;
done

Add "xmlsec-mycrypto" library to the "include/xmlsec/crypto.h" file:

Example 27. Modifying include/xmlsec/crypto.h file.

...	    
#ifdef XMLSEC_CRYPTO_MYCRYPTO
#include <xmlsec/mycrypto/app.h>
#include <xmlsec/mycrypto/crypto.h>
#include <xmlsec/mycrypto/symbols.h>
#else /* XMLSEC_CRYPTO_MYCRYPTO */
...
#endif /* XMLSEC_CRYPTO_MYCRYPTO */
...

Add "xmlsec-crypto" library to the configure.in file (for *nix systems; for Windows you need to modify win32/confgure.js and win32/Makefile.msvc files, see win32/README.txt for details):

Example 28. Modifying configure.in file.

dnl ==========================================================================
dnl See if we can find MyCrypto
dnl ==========================================================================
XMLSEC_MYCRYPTO_DEFINES=""
MYCRYPTO_CONFIG="mycrypto-config" # TODO
XMLSEC_NO_MYCRYPTO="1"
MYCRYPTO_MIN_VERSION="0.0.0" # TODO 
MYCRYPTO_VERSION=""
MYCRYPTO_PREFIX=""
MYCRYPTO_CFLAGS=""
MYCRYPTO_LIBS=""
MYCRYPTO_LDADDS=""
AC_MSG_CHECKING(for mycrypto libraries >= $MYCRYPTO_MIN_VERSION) 
AC_ARG_WITH(mycrypto, [  --with-mycrypto=[PFX]    mycrypto location])
if test "$with_mycrypto" = "no" ; then
    XMLSEC_CRYPTO_DISABLED_LIST="$XMLSEC_CRYPTO_DISABLED_LIST mycrypto"
    AC_MSG_RESULT(no)
else
    if test "$with_mycrypto" != "" ; then
	MYCRYPTO_PREFIX=$with_mycrypto
	MYCRYPTO_CONFIG=$MYCRYPTO_PREFIX/bin/$MYCRYPTO_CONFIG
    fi
    if ! $MYCRYPTO_CONFIG --version > /dev/null 2>&1 ; then
	if test "$with_mycrypto" != "" ; then
	    AC_MSG_ERROR(Unable to find mycrypto at '$with_mycrypto')
	fi
    else
        vers=`$MYCRYPTO_CONFIG --version | awk -F. '{ printf "%d", ($1 * 1000 + $2) * 1000 + $3;}'`
	minvers=`echo $MYCRYPTO_MIN_VERSION | awk -F. '{ printf "%d", ($1 * 1000 + $2) * 1000 + $3;}'`
	if test "$vers" -ge "$minvers" ; then
    	    MYCRYPTO_LIBS="`$MYCRYPTO_CONFIG --libs`"
	    MYCRYPTO_CFLAGS="`$MYCRYPTO_CONFIG --cflags`"
	    MYCRYPTO_VERSION="`$MYCRYPTO_CONFIG --version`"
	    XMLSEC_NO_MYCRYPTO="0"
	else
    	    AC_MSG_ERROR(You need at least mycrypto $MYCRYPTO_MIN_VERSION for this version of $PACKAGE)
	fi	
    fi

    dnl update crypt libraries list
    if test "z$XMLSEC_NO_MYCRYPTO" = "z0" ; then
	dnl first crypto library is default one
	if test "z$XMLSEC_CRYPTO" = "z" ; then
	    XMLSEC_CRYPTO="mycrypto"
    	    XMLSEC_CRYPTO_LIB="xmlsec1-mycrypto"
	    XMLSEC_CRYPTO_CFLAGS="$MYCRYPTO_CFLAGS -DXMLSEC_CRYPTO_MYCRYPTO=1"
	    XMLSEC_CRYPTO_LIBS="$MYCRYPTO_LIBS"
	    XMLSEC_CRYPTO_LDADDS="$MYCRYPTO_LDADDS"
	fi	
	XMLSEC_CRYPTO_LIST="$XMLSEC_CRYPTO_LIST mycrypto"
    	AC_MSG_RESULT(yes ('$MYCRYPTO_VERSION'))
    else
	XMLSEC_CRYPTO_DISABLED_LIST="$XMLSEC_CRYPTO_DISABLED_LIST mycrypto"
	AC_MSG_RESULT(no)
    fi
fi
AC_SUBST(XMLSEC_NO_MYCRYPTO)
AC_SUBST(MYCRYPTO_MIN_VERSION)
AC_SUBST(MYCRYPTO_VERSION)
AC_SUBST(MYCRYPTO_CONFIG)	
AC_SUBST(MYCRYPTO_PREFIX)
AC_SUBST(MYCRYPTO_CFLAGS)
AC_SUBST(MYCRYPTO_LIBS)
AC_SUBST(MYCRYPTO_LDADDS)
AC_SUBST(XMLSEC_MYCRYPTO_DEFINES)

...
AC_OUTPUT([
...
include/xmlsec/mycrypto/Makefile
src/mycrypto/Makefile
...
])

Modify "xmlsec.spec.in" file to create "xmlsec-mycrypto" RPM (if necessary).

By now you should be able to sucessfuly compile XML Security Library with MyCrypto library (we disable all other libraries to make sure that xmlsec command line utility is linked against xmlsec-mycrypto library):

Example 29. Compiling the results.

./autogen.sh --without-openssl --without-nss --without-gnutls --without-gcrypt \
    	     --with-mycrypto=$HOME --disable-tmpl-tests
make