# various RNGs Python example

import platform  # to learn the OS we're on
import oqs.rand as oqsrand  # must be explicitly imported

#######################################################################
# randomness example
#######################################################################

# set the entropy seed to some random values
entropy_seed = [0] * 48
entropy_seed[0] = 100
entropy_seed[20] = 200
entropy_seed[47] = 150

oqsrand.randombytes_nist_kat_init_256bit(bytes(entropy_seed))
oqsrand.randombytes_switch_algorithm("NIST-KAT")
print('{:17s}'.format("NIST-KAT:"), ' '.join('{:02X}'.format(x) for x in oqsrand.randombytes(32)))

# we do not yet support OpenSSL under Windows
if platform.system() != "Windows":
    oqsrand.randombytes_switch_algorithm("OpenSSL")
    print('{:17s}'.format("OpenSSL:"), ' '.join('{:02X}'.format(x) for x in oqsrand.randombytes(32)))

oqsrand.randombytes_switch_algorithm("system")
print('{:17s}'.format("System (default):"), ' '.join('{:02X}'.format(x) for x in oqsrand.randombytes(32)))