md5 in inline C

[dwi kristianto]

hello all,

is there any easy way to use md5 with varnish VCL inline C?'

i've tried this code with no luck.
at sub vcl_recv:
#include <openssl/ssl.h>
#include <openssl/ssl3.h>

void md5_hashing(char *msg, char *md5hash){
	EVP_MD_CTX mdctx;
	const EVP_MD *md;
	unsigned char md_value[EVP_MAX_MD_SIZE];
	int md_len, i;

	EVP_MD_CTX_init(&mdctx);
	EVP_DigestInit_ex(&mdctx, md, NULL);
	EVP_DigestUpdate(&mdctx, msg, strlen(msg));
	EVP_DigestFinal_ex(&mdctx, md5hash, &md_len);
	EVP_MD_CTX_cleanup(&mdctx);
}


taken from /etc/init.d/varnish
start_varnishd() {
    log_daemon_msg "Starting $DESC" "$NAME"
    output=$(/bin/tempfile -s.varnish)
    if start-stop-daemon \
        --start --quiet --pidfile ${PIDFILE} --exec ${DAEMON} -- \
        -P ${PIDFILE} ${DAEMON_OPTS} \
				-p cc_command='cc -fpic -shared -Wl,-x --verbose \
				-L/usr/local/include/libmemcached/memcached.h -lmemcached \
				-L/usr/local/include/openssl/ssl3.h -lssl \
				-o %o %s' > ${output} 2>&1; then
        log_end_msg 0
    else
        log_end_msg 1
        cat $output
        exit 1
    fi
    rm $output
}

many thanks in advance for any responses.
regards,
dwi