StreamLined Activation - Authenticate the DNA Library

To ensure that your Application is working with a valid / authenticated DNA Library, versus an illegitimate or hacked Library, you can authenticate the DNA Library as follows:

• compute the MD5 or SHA1 Hash Code of the DNA Library (ex: DNA.DLL) file on the user’s device (usually located in the same directory as the application)

• compare it to the known MD5 or SHA1 code for the specific version of the DNA Library you are using

• If it does not match, it is not a valid DNA Library, exit the program.

Authentication of the DNA Library is one element of an overall strategy to protect your App from hacking. On some OS's that enforce Application signing (ex: Mac OS, Android), this step is optional.

See Hacking Protection   for more insights into an overall strategy.

MD5 or SHA1 Hash Algorithm

You must use the SHA1 Hash algorithm if your Users may be subject to FIPS (US Government) compliance. Do not include or use the MD5 Hash algorithm in such situations to prevent your App being blocked from running on Windows computers.

In all other situations, you can use either the MD5 or SHA1 Hash algorithm to authenticate the DNA Library.

                	
                        // definition of constants unShuffledMD5 
                        
                        // 64-bit DLL MD5 - use the correct MD5 for the DNA Library used
                        //
                        #define unShuffledMD5 "5a304c147fca8fd97d41cfdd149b92c7"
                        
                        // at start-up of the application
                        //
                        // authenticate the DNA.DLL’s MD5
                        //
                        // declare variables used in MD5 check
                        
                        char* MD5DigestHex;
                        MD5 md5 ;
                        
                        MD5DigestHex = md5.digestFile( "DNA.DLL" );	
                        
                        if (strcmp((const char *)MD5DigestHex,unShuffledMD5)!=0)
                            {
                            // invalid MD5 
                            // - quit the application
                            // - show error message (optional)
                            }