According to the following article, the key components of fascism are:
A Fascism Scale
- Leadership Principle - absolute rule by an individual
- Group is superior to and more important than the individual
- Own group is superior to other groups
- Veneration of heroic traditions and (sometimes mythical) bygone days (eg: Romans, Norse sagas, Samurai, imperial Spain)
- Struggle and death are glorious - cult of heroism
- Cult of action and activism
- Frustration: sense of collective injustice inflicted by foreign enemies.
- Militarist expansionism - World or regional domination is a central goal
- Political repression: Suppression of liberty and intellectual life
- Racism
http://www.mideastweb.org/log/archives/00000523.htm
Although I disagree with the author on the last point. Fascist systems are not inherently racist even if they have been historically.
But we see that the other key characteristics of fascism are also found in Islam.
Victor Hanson, writing on the similarity between fascism and Islam further explains the "veneration of heroic traditions" unique to both ideologies:
Islamic fascism is also anti-democratic and characteristically reactionary. It conjures up a past of Islamic influence that existed before the supposed corruption of modernism. Like Hitler, Mussolini and Tojo, who sought to recapture lost mythical Aryan, Roman or samurai purity, so Islamic fascists talk in romantic terms of the ancient caliphate.
http://www.writersreps.com/feature.aspx?FeatureID=72
Needless to say, every other characteristic can demonstrably be shown to exist in mainstream interpretations of Islam - the cult of death (martyrdom), absolute authority to a reactionary government, militarism, political repression, supremacist beliefs and ultra nationalism (in the case of Islam, it is the Muslim Ummah (state or volk) that is superior to the non-Muslim world, tellingly known as the "house of war" [Dar al-harb] by Muslims.