Ruby

Generating Repeatable Random Data for Testing/Debugging

See more PRNG Examples

Demonstrates how to use the Fortuna PRNG to generate random-looking but repeatable non-random data for the purpose of testing and debugging. Ruby

require 'chilkat'

success = false

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

success = false

fortuna = Chilkat::CkPrng.new()

# 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")

print "hex random bytes: " + strRandHex + "\n";
print "base64 random bytes: " + strRandBase64 + "\n";
print "base58 random bytes: " + strRandBase58 + "\n";

# Try it again with a different object to verify that the same results are obtained:
fortuna2 = Chilkat::CkPrng.new()

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")

print "hex random bytes: " + strRandHex + "\n";
print "base64 random bytes: " + strRandBase64 + "\n";
print "base58 random bytes: " + strRandBase58 + "\n";