How to make already written Encryption code in JDK 1.3 work in JDK 1.4

Hi,
We are using JCE to encrypt a number.The following code was written in JDK 1.3 and is now on the Live site.
          byte[] publicKeyBytes =new BigInteger("zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz", Character.MAX_RADIX).toByteArray();
     EncodedKeySpec spec = new X509EncodedKeySpec(publicKeyBytes);
PublicKey key = KeyFactory.getInstance("RSA").generatePublic(spec);
// Create Cipher
Cipher desCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
     desCipher.init(Cipher.ENCRYPT_MODE, key);
We are now migrating to JDK 1.4. When I tried to execute the above lines in JDK 1.4, it came back with the following error
"Cannot find any provider supporting RSA/ECB/PKCS1Padding"
Then I downloaded and copied over the iaik_jce_full.jar in \j2sdk1.4.1_05\jre\lib\ext\ folder
and added the following entry in \j2sdk1.4.1_05\jre\lib\security\java.policy
security.provider.1=iaik.security.provider.IAIK
Now, it has started giving me the following error:
java.lang.ExceptionInInitializerError
     at javax.crypto.Cipher.a(DashoA6275)
     at javax.crypto.Cipher.getInstance(DashoA6275)
Caused by: java.lang.SecurityException: Cannot set up certs for trusted CAs
     at javax.crypto.SunJCE_b.(DashoA6275)
     ... 39 more
Caused by: java.lang.UnsupportedOperationException
     at java.security.cert.CertificateFactorySpi.engineGenerateCertPath(CertificateFactorySpi.java:155)
     at java.security.cert.CertificateFactory.generateCertPath(CertificateFactory.java:470)
     at javax.crypto.SunJCE_d.a(DashoA6275)
     at javax.crypto.SunJCE_d.a(DashoA6275)
     at javax.crypto.SunJCE_b.i(DashoA6275)
     at javax.crypto.SunJCE_b.h(DashoA6275)
     at javax.crypto.SunJCE_v.run(DashoA6275)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 40 more
Can someone tell me where I am wrong and please write the steps I need to follow to make the above code work in JDK 1.4
Bye

in java 1.4 JSSE is default provider
may be u need to use another provider (SunJCE)
see JSSE :
Note for People Implementing Providers
The transformation strings used when SunJSSE calls Cipher.getInstance() are "RSA/ECB/PKCS1Padding", "RC4", "DES/CBC/NoPadding", and "DESede/CBC/NoPadding". For further information on the Cipher class and transformation strings see the JCE Reference Guide.
PS u didnot need load jce. it is into j2se 1.4

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