IJ10490: AES/GCM CIPHER - AAD NOT RESET TO UN-INIT STATE AFTER DOFINAL( ) AND INIT( )

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  When the same AES/GCM cipher object is used to perform both the
  encryption and the decryption of a piece of data, the customer
  observed that if an AAD value with length=0 is supplied for
  decryption, then the decryption operation would unexpectedly
  succeed.
  

Local fix

Problem summary

• The IBMJCEPlus provider code was failing to reset the AAD value
  to its uninitialized state within the AES/GCM cipher object
  state during init( ) processing and doFinal( ) processing, as
  dictated by the Cipher javadocs.
  The Cipher framework updateAAD( ) method discards any AAD values
  with length=0. Therefore, the AAD value supplied to the AES/GCM
  cipher object for decryption was being discarded, and the AAD
  value that had been supplied for encryption was retained and was
  reused for decryption.
  

Problem conclusion

• The AES/GCM cipher code of the IBMJCEPlus provider has been
  modified to set the AAD value within the cipher object to its
  uninitialized state during init( ) and doFinal( ) processing.
  The GIT issue associated with this change is #160.
  The RTC Problem report associated with this change is 139433.
  The affected IBM JVM's are: 80sr5fp25
  The affected jar file is ibmjceplus.jar.
  The build level of the updated IBMJCEPlus jar file is: 20181011
  This build also includes support for DSA in IBMJCEPlusFIPS.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR5 FP30 (8.0.5.30)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
   https://www.ibm.com/developerworks/java/jdk/
  

Temporary fix

Comments

APAR Information

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

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

• Fixed component name

  SECURITY

• Fixed component ID

  620700125

Applicable component levels