Java Security

Hi,

This is the first time I have used encryption features in java and I am experiencing some issues.

I have been given a value which has been encrypted with blowfish and then base64 encoded.

I have also been given the key (a string) which was used for the blowfish encryption.

My task is to base64 decode the value, then decrypt it using blowfish.

I am testing this from within a JSP page and I have pasted the code below.

If I use "Blowfish/CBC/PKCS5Padding" for my algorithm, I get an error: "java.security.InvalidKeyException: Parameters missing"

If I use "Blowfish/ECB/PKCS5Padding" I get an error:
"javax.crypto.BadPaddingException: Given final block not properly padded"

I've had a look through some forums for answers but I am still stuck (even though the code I'm using seems the same).

Code:

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String algorithm = "Blowfish/ECB/PKCS5Padding";
//String algorithm = "Blowfish/CBC/PKCS5Padding";
byte[] brdata = null;
String msg = "";
String originaldata = "base64encodedstring=";

BASE64Decoder decoder = new BASE64Decoder();

byte[] decodeddata = decoder.decodeBuffer(originaldata);

String KeyData = "keystring";
byte[] KeyBytes = KeyData.getBytes();

SecretKeySpec skeySpec = new SecretKeySpec(KeyBytes,"Blowfish");

Cipher cipher = null;

cipher = Cipher.getInstance(algorithm);
cipher.init(Cipher.DECRYPT_MODE, skeySpec);

//brdata = decrypt(decodeddata,cipher);

brdata = cipher.doFinal(decodeddata);

msg = new String(brdata);

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Any help would be greatly appreciated

** Using java 2 SDK, SE v1.4.2_01 **