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# frozen_string_literal: true
require "securerandom"
module SecureRandom
BASE58_ALPHABET = ("0".."9").to_a + ("A".."Z").to_a + ("a".."z").to_a - ["0", "O", "I", "l"]
BASE36_ALPHABET = ("0".."9").to_a + ("a".."z").to_a
# 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
# SecureRandom.base36 generates a random base36 string in lowercase.
#
# 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.
# This method can be used over +base58+ if a deterministic case key is necessary.
#
# The result will contain alphanumeric characters in lowercase.
#
# p SecureRandom.base36 # => "4kugl2pdqmscqtje"
# p SecureRandom.base36(24) # => "77tmhrhjfvfdwodq8w7ev2m7"
def self.base36(n = 16)
SecureRandom.random_bytes(n).unpack("C*").map do |byte|
idx = byte % 64
idx = SecureRandom.random_number(36) if idx >= 36
BASE36_ALPHABET[idx]
end.join
end
end
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