RFR: 8157603 TestCipher.java doesn't check one of the decrypted message as expected

[Artem Kosarev]

Could you please review the proposed fix for regression test

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8157603
WEBREV: http://cr.openjdk.java.net/~akosarev/8157603/webrev.00 
<http://cr.openjdk.java.net/%7Eakosarev/8157603/webrev.00/>

DESCRIPTION:
**Main problem is that we were not performing check that decryption into 
same buffer went correct.
     Instead, string created by decryption into another buffer was 
checked twice.

     Fix for the above issue was easy, but I also identified one more 
mistake:
Initially, we were not calculating size of encrypted/decrypted messages 
when they were stored into the same buffer. After my fix their lengths 
will be calculated using values returned from /update /& /doFinal /methods.

Moreover, I applied additional check on the length of crypted/decrypted 
messages.


Changes were successfully tested by JPRT.


Best regards,
Artem Kosarev.

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