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U:RDoc::AnyMethod[iI" uuid:EFI"Random::Formatter#uuid;TF: publico:RDoc::Markup::Document: @parts[o:RDoc::Markup::Verbatim; [1I"=# SecureRandom.random_number generates a random number. ;TI"# ;TI".# If a positive integer is given as _n_, ;TI"C# +SecureRandom.random_number+ returns an integer, such that: ;TI"1# +0 <= SecureRandom.random_number(n) < n+. ;TI"# ;TI"2# p SecureRandom.random_number(100) #=> 15 ;TI"2# p SecureRandom.random_number(100) #=> 88 ;TI"# ;TI"2# If 0 is given or an argument is not given, ;TI"@# +SecureRandom.random_number+ returns a float, such that: ;TI"4# +0.0 <= SecureRandom.random_number() < 1.0+. ;TI"# ;TI"<# p SecureRandom.random_number #=> 0.596506046187744 ;TI"<# p SecureRandom.random_number #=> 0.350621695741409 ;TI"# ;TI" def random_number(n=0) ;TI" if 0 < n ;TI"! if defined? OpenSSL::BN ;TI"* OpenSSL::BN.rand_range(n).to_i ;TI" else ;TI" hex = n.to_s(16) ;TI"4 hex = '0' + hex if (hex.length & 1) == 1 ;TI"" bin = [hex].pack("H*") ;TI" mask = bin[0].ord ;TI" mask |= mask >> 1 ;TI" mask |= mask >> 2 ;TI" mask |= mask >> 4 ;TI" begin ;TI", rnd = random_bytes(bin.length) ;TI". rnd[0] = (rnd[0].ord & mask).chr ;TI" end until rnd < bin ;TI"# rnd.unpack("H*")[0].hex ;TI" end ;TI" else ;TI"- # assumption: Float::MANT_DIG <= 64 ;TI"! if defined? OpenSSL::BN ;TI"/ i64 = OpenSSL::BN.rand(64, -1).to_i ;TI" else ;TI"0 i64 = random_bytes(8).unpack("Q")[0] ;TI" end ;TI"C Math.ldexp(i64 >> (64-Float::MANT_DIG), -Float::MANT_DIG) ;TI" end ;TI" end ;T: @format0o: RDoc::Markup::Paragraph; [I"U# SecureRandom.uuid generates a random v4 UUID (Universally Unique IDentifier). ;TI"# ;TI"H# p SecureRandom.uuid #=> "2d931510-d99f-494a-8c67-87feb05e1594" ;TI"H# p SecureRandom.uuid #=> "bad85eb9-0713-4da7-8d36-07a8e4b00eab" ;TI"H# p SecureRandom.uuid #=> "62936e70-1815-439b-bf89-8492855a7e6b" ;TI"# ;TI"A# The version 4 UUID is purely random (except the version). ;TI"Y# It doesn't contain meaningful information such as MAC addresses, timestamps, etc. ;TI"# ;TI"A# The result contains 122 random bits (15.25 random bytes). ;TI"# ;TI")# See RFC 4122 for details of UUID. ;TI"#;T: @fileI"lib/securerandom.rb;T:0@omit_headings_from_table_of_contents_below000[ I"();T@HFI"Formatter;FcRDoc::NormalModule00
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