Module: SecureRandom

Defined in:
lib/active_support/core_ext/securerandom.rb

Constant Summary collapse

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

Class Method Summary collapse

Class Method Details

.base36(n = 16) ⇒ Object

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"

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# File 'lib/active_support/core_ext/securerandom.rb', line 38

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

.base58(n = 16) ⇒ Object

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"

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# File 'lib/active_support/core_ext/securerandom.rb', line 19

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