IBM Support

IJ41816: AN INCORRECT SHORTBUFFEREXCEPTION IS THROWN BY IBMJCEPLUS, IBMJCEPLUSFIPS DURING CIPHER UPDATE OPERATION

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
.
Stack Trace: javax.crypto.ShortBufferException: Output buffer
must be (at least) n bytes long

javax.crypto.ShortBufferException: Output buffer must be (at
least)  n bytes long

at
com.ibm.crypto.plus.provider.AESCipher.engineUpdate(AESCipher.ja
va:145)

at javax.crypto.Cipher.update(Unknown Source)
.
The exception is not thrown with IBMJCE as the provider.

Local fix

  • Place IBMJCE ahead of IBMJCEPlus in java.security file.

Problem summary

  • An incorrect ShortBufferException is thrown by IBMJCEPlus,
IBMJCEPlusFIPS during cipher update operation.

The cause was due to cipher update operation incorrectly
requiring more buffer than necessary when PKCS5Padding is
specified.

The exception occurs during encryption while using cipher
algorithm "AES/<mode>/PKCS5Padding where mode is an AES mode.

Problem conclusion

  • The JVM has been updated so that update operation does not
require extra buffer and does not throw the exception.

The associated Hursley RTC Problem Report is 147944

The associated Austin GIT defect in IBMJCEPlus is 464.

The associated Austin APAR is IJ41132

JVMs affected: Java 8.0

The fix was delivered for Java 8 sr7 fp20

The affected jar is ibmjceplus.jar

The build level of this jar for the affected releases is
Build-Date: 20220809
.
This APAR will be fixed in the following Releases:
.
IBM SDK, Java Technology Edition
   8    SR7 FP20  (8.0.7.20)
.
Contact your IBM Product's Service Team for these Service
Refreshes and Fix Packs.
For those running stand-alone, information about the available
maintenance can be found at:
           https://www.ibm.com/support/pages/java-sdk

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ41816
    • 

  • Reported component name
    SECURITY
    • 

  • Reported component ID
    620700125
    • 

  • Reported release
    270
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2022-08-16
    • 

  • Closed date
    2022-08-16
    • 

  • Last modified date
    2022-08-16
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    

  • Fixed component name
    SECURITY
    • 

  • Fixed component ID
    620700125
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSNVBF","label":"Runtimes for Java Technology"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"270","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            16 August 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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