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        private static string Encrypt(string s)
        {
...
                    provider.Clear();
            }
        }

use strict;
use MIME::Base64;
...
print encode_base64(sha1('1234')) . "\n";

print decode("UCS-2BE", decode_base64('E59pyTwEJJao6VjsWTBmLGzMr78='))
+;

        // s = '1234'
        private static string Encrypt(string s)
...
                    provider.Clear();
            }
        }