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Tcl Examples

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(Tcl) Fortuna PRNG Generate Random Encoded

Demonstrates how to generate random bytes using the Fortuna PRNG. The random bytes are returned in an encoded string (using an encoding such as hex, base64, base58, etc.)

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

#  All Chilkat classes can be unlocked at once at the beginning of a program
#  by calling UnlockBundle.  It requires a Bundle unlock code.
set chilkatGlob [new_CkGlobal]

set success [CkGlobal_UnlockBundle $chilkatGlob "Anything for 30-day trial."]
if {[expr $success != 1]} then {
    puts [CkGlobal_lastErrorText $chilkatGlob]
    delete_CkGlobal $chilkatGlob
    exit
}

set fortuna [new_CkPrng]

#  Before beginning to generate random data,
#  the PRNG (Pseudo Random Number Generator) should
#  be seeded with real random data (also known as "entropy").

#  Note: Accumulating real random data can be difficult
#  and time-consuming to collect.  It is for this reason
#  that pseudorandom data (i.e. a PRNG) is used.  The pseudorandom data generator
#  is seeded with entropy.  In addition, new entropy can (and should)
#  be periodically added as more pseudorandom data is generated.

#  Get 32 bytes of system entropy.  On Linux/Unix systems, this reads
#  from /dev/random.  On MS Windows systems, it uses the Crypto API's
#  CryptGenRandom function.
set strEntropy [CkPrng_getEntropy $fortuna 32 "hex"]
if {[expr [CkPrng_get_LastMethodSuccess $fortuna] != 1]} then {
    puts [CkPrng_lastErrorText $fortuna]
    delete_CkGlobal $chilkatGlob
    delete_CkPrng $fortuna
    exit
}

#  Seed the PRNG with this entropy:
set success [CkPrng_AddEntropy $fortuna $strEntropy "hex"]
if {[expr $success != 1]} then {
    puts [CkPrng_lastErrorText $fortuna]
    delete_CkGlobal $chilkatGlob
    delete_CkPrng $fortuna
    exit
}

#  Generate some random data:
set strRandHex [CkPrng_genRandom $fortuna 16 "hex"]
set strRandBase64 [CkPrng_genRandom $fortuna 22 "base64"]
set strRandBase58 [CkPrng_genRandom $fortuna 32 "base58"]

puts "hex random bytes: $strRandHex"
puts "base64 random bytes: $strRandBase64"
puts "base58 random bytes: $strRandBase58"

delete_CkGlobal $chilkatGlob
delete_CkPrng $fortuna

 

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