Heat olive oil in a large sauté pan. Add onion, curry and garlic and cook until onion is translucent. Add shrimp and sauté until just pink, about 5 minutes. Remove from heat and let cool completely.
Place 2 cups corn, sour cream and buttermilk in a food processor and process until well-blended. Transfer to large storage container. Add remaining corn, shrimp mixture, salt, pepper and Tabasco, stirring well. Cover and refrigerate at least 2 hours. Serve soup in chilled bowls, sprinkling top with chives.