nsIStreamCipher Interface

 Discard aLen bytes of the keystream.
 These days 1536 is considered a decent amount to drop to get
 the key state warmed-up enough for secure usage.

void discard(in long aLen)

 @param aASCII if true then the returned value is a base-64
        encoded string.  if false, then the returned value is
        binary data.

ACString finish(in PRBool aASCII)

 Initialize a stream cipher.
 @param aKey nsIKeyObject

void init(in nsIKeyObject aKey)

 Initialize a stream cipher with an initialization vector.
 @param aKey nsIKeyObject
 @param aIV the initialization vector
 @param aIVLen the length of the initialization vector

void initWithIV(in nsIKeyObject aKey, [const, array, size_is(aIVLen)] in octet aIV, in unsigned long aIVLen)

 Update from an array of bytes.

void update([const, array, size_is(aLen)] in octet aData, in unsigned long aLen)

 Update from a stream.

void updateFromStream(in nsIInputStream aStream, in long aLen)

 A more script friendly method (not in nsICryptoHash interface).

void updateFromString(in ACString aInput)