How Solve this iaik.pkcs.pkcs1.b.b(Unknown Source) Error.

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Hi Experts

I am trying to decrypt the user login credentials while logging to SAP portal. Bellow code is used.

PrivateKey privKey = bean.getRandomKey();

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.DECRYPT_MODE,privKey);

cipherData = cipher.doFinal(new BASE64Decoder().decodeBuffer(enPwd));

But I am getting the error specified below, May I kindly request you please give me some approach to resolve this problem if you have come across the same issue earlier.

iaik.pkcs.pkcs1.b.b(Unknown Source)

iaik.pkcs.pkcs1.RSACipher.a(Unknown Source)

iaik.pkcs.pkcs1.RSACipher.engineDoFinal(UnknownSource)

javax.crypto.Cipher.doFinal(DashoA12275)

We use SAP Portal version 7.01 SP12 and JDK 1.4.2_19.

Configtool to set the path of the cookie and domain of the cookie are Changed.

"cluster-data" -> "Global Server Configuration" -> "services" -> "servlet_jsp"

Please find the attached image.

But Default setting are there that time it's working,But some security region that settings customized.the following way

JSESSIONID.CookieDomain = SERVER (Default value)
SESSIONID.CookiePath = APPLICATION(Custom values)
SAPLB.CookiePath = APPLICATION(Custom values)
SAPLB.CookieDomain = SERVER(Custom values)

This below settings is there that time working fine.

SESSIONID.CookiePath = / (Default values)
SAPLB.CookiePath = / (Default values)
SAPLB.CookieDomain = NONE(Default values)

Please give your suggestion and Help...Solution is Required.

Thank you && Regards,

Durga Rao