JavaPurseCrypto Sample

This sample is available only in bundles intended solely for distribution inside the U.S.

The JavaPurseCrypto sample application consists of two components, a JavaPurseCrypto applet and a JavaLoyalty applet. The JavaPurseCrypto applet employs a version of JavaPurse that uses a DES MAC algorithm. A DES MAC is a cryptographic signature that uses DES encryption on all or part of a message (APDU). JavaPurseCrypto uses the DES MAC to verify several of the APDUs. Instead of zeros in the signature currently in JavaPurse, it contains a real signature that can be programmatically signed and verified. Other programs that might interact with JavaPurseCrypto are not affected because all signing and verifying of the signature occurs only within JavaPurseCrypto.

The JavaPurseCrypto sample uses transient DES keys. The use of transient DES keys by the sample highlights the fact that the DES cryptography API has been enhanced to eliminate persistent memory usage when transient DES keys are provided. Eliminating the use of persistent memory when transient DES keys are used provides better performance in a contactless applet.

As in the JavaPurse sample, the JavaLoyalty applet is a minimalistic loyalty applet that interacts with JavaPurseCrypto and demonstrates the use of shareable interfaces. See JavaPurse Sample Application for additional information about the JavaLoyalty applet.