Use below method of jar to generate checksum and verify checksum as per your JDK version

1. Generate Checksum For Transaction Request:
   public String genrateCheckSum(String Key, TreeMap<String, String> paramap)
2. Generate Checksum For Refund Request:
   public String genrateRefundCheckSum(String Key, TreeMap<String, String> paramap)
3. Verify Checksum:
   public boolean verifycheckSum(String masterKey, TreeMap<String, String> paramap,String responseCheckSumString)

1. Generate Checksum For Transaction Request:
   public String genrateCheckSumIBMJCE(String Key, TreeMap<String, String> paramap)
2. Generate Checksum For Refund Request:
   public String genrateRefundCheckSumIBMJCE(String Key, TreeMap<String, String> paramap)
3. Verify Checksum:
   public boolean verifycheckSumGAE(String masterKey, TreeMap<String, String> paramap,String responseCheckSumString)

1. Generate Checksum For Transaction Request:
   public String genrateCheckSumGAE(String Key, TreeMap<String, String> paramap)
2. Generate Checksum For Refund Request:
   public String genrateRefundCheckSumGAE(String Key, TreeMap<String, String> paramap)
3. Verify Checksum:
   public boolean verifycheckSumIBMJCE(String masterKey, TreeMap<String, String> paramap,String responseCheckSumString)