Decryption

I am using the below function written by PESO to encrypt/Decrypt the data for my SSN Numbers stored as a Clear Text

First I am Encrypting all my SSN's using this function and storing it in the database in a seperate Column,

Some thing like this..

SELECT DBACentral.dbo.fnEncDecRc4( '145678908' , 'ty6578dmp1203' )
OUPPUT
--------
âUÙN_{��

How to Decrypt ( âUÙN_{�� ) using the below function.

CREATE FUNCTION dbo.fnEncDecRc4
(
@Pwd VARCHAR(256),
@Text VARCHAR(8000)
)
RETURNSVARCHAR(8000)
AS

BEGIN
DECLARE@Box TABLE (i TINYINT, v TINYINT)

INSERT@Box
(
i,
v
)
SELECTi,
v
FROMdbo.fnInitRc4(@Pwd)

DECLARE@Index SMALLINT,
@i SMALLINT,
@j SMALLINT,
@t TINYINT,
@k SMALLINT,
@CipherBy TINYINT,
@Cipher VARCHAR(8000)

SELECT@Index = 1,
@i = 0,
@j = 0,
@Cipher = ''

WHILE @Index <= DATALENGTH(@Text)
BEGIN
SELECT@i = (@i + 1) % 256

SELECT@j = (@j + b.v) % 256
FROM@Box b
WHEREb.i = @i

SELECT@t = v
FROM@Box
WHEREi = @i

UPDATEb
SETb.v = (SELECT w.v FROM @Box w WHERE w.i = @j)
FROM@Box b
WHEREb.i = @i

UPDATE@Box
SETv = @t
WHEREi = @j

SELECT@k = v
FROM@Box
WHEREi = @i

SELECT@k = (@k + v) % 256
FROM@Box
WHEREi = @j

SELECT@k = v
FROM@Box
WHEREi = @k

SELECT@CipherBy = ASCII(SUBSTRING(@Text, @Index, 1)) ^ @k,
@Cipher = @Cipher + CHAR(@CipherBy)

SELECT@Index = @Index +1
END

RETURN@Cipher
END

GO

Thanks for any help