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[iaik-jce] encrypt with RSA twice

Hello to all,

When I try to ENCRYPT  the same data twice using two keys RSA...


    -- keyPR and keyPu are a key par, and key2PR and key2Pu  are another

key par


     byte a[] =  desCipher.doFinal("hello to all".getBytes());


    byte c[] =  desCipher.doFinal(a); *

On second *  iteration appears this error::
    javax.crypto.BadPaddingException: Padding String must be at least 8
octets long!
        at iaik.pkcs.pkcs1.RSACipher.b(Unknown Source)
        at iaik.pkcs.pkcs1.RSACipher.engineDoFinal(Unknown Source)
        at javax.crypto.Cipher.doFinal(Unknown Source)

Why isn't  ENCRYPT the same data twice?


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