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require 'securerandom'
module SecureRandom
BASE58_ALPHABET = ('0'..'9').to_a + ('A'..'Z').to_a + ('a'..'z').to_a - ['0', 'O', 'I', 'l']
# SecureRandom.base58 generates a random base58 string.
#
# The argument _n_ specifies the length, of the random string to be generated.
#
# If _n_ is not specified or is nil, 16 is assumed. It may be larger in the future.
#
# The result may contain alphanumeric characters except 0, O, I and l
#
# p SecureRandom.base58 #=> "4kUgL2pdQMSCQtjE"
# p SecureRandom.base58(24) #=> "77TMHrHJFvFDwodq8w7Ev2m7"
#
def self.base58(n = 16)
SecureRandom.random_bytes(n).unpack("C*").map do |byte|
idx = byte % 64
idx = SecureRandom.random_number(58) if idx >= 58
BASE58_ALPHABET[idx]
end.join
end
end
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