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(Unicode C) Generating Repeatable Random Data for Testing/DebuggingDemonstrates how to use the Fortuna PRNG to generate random-looking but repeatable non-random data for the purpose of testing and debugging.
#include <C_CkGlobalW.h> #include <C_CkPrngW.h> void ChilkatSample(void) { HCkGlobalW chilkatGlob; BOOL success; HCkPrngW fortuna; const wchar_t *strRandHex; const wchar_t *strRandBase64; const wchar_t *strRandBase58; HCkPrngW fortuna2; // All Chilkat classes can be unlocked at once at the beginning of a program // by calling UnlockBundle. It requires a Bundle unlock code. chilkatGlob = CkGlobalW_Create(); success = CkGlobalW_UnlockBundle(chilkatGlob,L"Anything for 30-day trial."); if (success != TRUE) { wprintf(L"%s\n",CkGlobalW_lastErrorText(chilkatGlob)); CkGlobalW_Dispose(chilkatGlob); return; } fortuna = CkPrngW_Create(); // Normally an application would seed the PRNG with entropy from // some real random source. However, sometimes we want the same // random sequence of bytes for testing and debugging purposes. // This a reason why GetEntropy and AddEntropy are two different methods. // An application could omit the call to GetEntropy, and instead pass // non-random data to AddEntropy. For example: // Seed the PRNG with non-entropy, so we get a repeatable sequence. // Note: AddEntropy can be called any number of times. success = CkPrngW_AddEntropy(fortuna,L"01020304",L"hex"); success = CkPrngW_AddEntropy(fortuna,L"hello world",L"ascii"); // Generate some random data: strRandHex = CkPrngW_genRandom(fortuna,16,L"hex"); strRandBase64 = CkPrngW_genRandom(fortuna,22,L"base64"); strRandBase58 = CkPrngW_genRandom(fortuna,32,L"base58"); wprintf(L"hex random bytes: %s\n",strRandHex); wprintf(L"base64 random bytes: %s\n",strRandBase64); wprintf(L"base58 random bytes: %s\n",strRandBase58); // Try it again with a different object to verify that the same results are obtained: fortuna2 = CkPrngW_Create(); success = CkPrngW_AddEntropy(fortuna2,L"01020304",L"hex"); success = CkPrngW_AddEntropy(fortuna2,L"hello world",L"ascii"); strRandHex = CkPrngW_genRandom(fortuna2,16,L"hex"); strRandBase64 = CkPrngW_genRandom(fortuna2,22,L"base64"); strRandBase58 = CkPrngW_genRandom(fortuna2,32,L"base58"); wprintf(L"hex random bytes: %s\n",strRandHex); wprintf(L"base64 random bytes: %s\n",strRandBase64); wprintf(L"base58 random bytes: %s\n",strRandBase58); CkGlobalW_Dispose(chilkatGlob); CkPrngW_Dispose(fortuna); CkPrngW_Dispose(fortuna2); } |
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