Module: SecureRandom

Defined in:
opal/stdlib/securerandom.rb

Class Method Summary collapse

Class Method Details

.hex(count = nil) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'opal/stdlib/securerandom.rb', line 2

def self.hex(count = nil)
  count ||= 16
  count = count.to_int unless `typeof count === "number"`
  raise ArgumentError, 'count of hex numbers must be positive' if count < 0
  %x{
    count = Math.floor(count);
    var repeat = Math.floor(count / 6),
        remain = count % 6,
        remain_total = remain * 2,
        string = '',
        temp;
    for (var i = 0; i < repeat; i++) {
      // parseInt('ff'.repeat(6), 16) == 281474976710655
      temp = Math.floor(Math.random() * 281474976710655).toString(16);
      if (temp.length < 12) {
        // account for leading zeros gone missing
        temp = '0'.repeat(12 - temp.length) + temp;
      }
      string = string + temp;
    }
    if (remain > 0) {
      temp = Math.floor(Math.random()*parseInt('ff'.repeat(remain), 16)).toString(16);
      if (temp.length < remain_total) {
        // account for leading zeros gone missing
        temp = '0'.repeat(remain_total - temp.length) + temp;
      }
      string = string + temp;
    }
    return string;
  }
end

.uuid ⇒ Object 



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# File 'opal/stdlib/securerandom.rb', line 34

def self.uuid
  'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.gsub(/[xy]/) do |ch,|
    %x{
      var r = Math.random() * 16 | 0,
          v = ch == "x" ? r : (r & 3 | 8);

      return v.toString(16);
    }
  end
end