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(Go) 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.
// All Chilkat classes can be unlocked at once at the beginning of a program // by calling UnlockBundle. It requires a Bundle unlock code. chilkatGlob := chilkat.NewGlobal() success := chilkatGlob.UnlockBundle("Anything for 30-day trial.") if success != true { fmt.Println(chilkatGlob.LastErrorText()) chilkatGlob.DisposeGlobal() return } fortuna := chilkat.NewPrng() // 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 = fortuna.AddEntropy("01020304","hex") success = fortuna.AddEntropy("hello world","ascii") // Generate some random data: strRandHex := fortuna.GenRandom(16,"hex") strRandBase64 := fortuna.GenRandom(22,"base64") strRandBase58 := fortuna.GenRandom(32,"base58") fmt.Println("hex random bytes: ", *strRandHex) fmt.Println("base64 random bytes: ", *strRandBase64) fmt.Println("base58 random bytes: ", *strRandBase58) // Try it again with a different object to verify that the same results are obtained: fortuna2 := chilkat.NewPrng() success = fortuna2.AddEntropy("01020304","hex") success = fortuna2.AddEntropy("hello world","ascii") strRandHex = *fortuna2.GenRandom(16,"hex") strRandBase64 = *fortuna2.GenRandom(22,"base64") strRandBase58 = *fortuna2.GenRandom(32,"base58") fmt.Println("hex random bytes: ", *strRandHex) fmt.Println("base64 random bytes: ", *strRandBase64) fmt.Println("base58 random bytes: ", *strRandBase58) chilkatGlob.DisposeGlobal() fortuna.DisposePrng() fortuna2.DisposePrng() |
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