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English.rb
5.6
KB
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Env.rb
274
B
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abbrev.rb
2.5
KB
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base64.rb
3.37
KB
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benchmark.rb
17.73
KB
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cgi-lib.rb
6.89
KB
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cgi.rb
73.74
KB
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complex.rb
12.84
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csv.rb
24.46
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date.rb
53.02
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date2.rb
128
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debug.rb
20.61
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delegate.rb
8.81
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digest.rb
1.12
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drb.rb
19
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e2mmap.rb
4.04
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erb.rb
21.38
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eregex.rb
487
B
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expect.rb
633
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fileutils.rb
42.23
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finalize.rb
5.38
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find.rb
1.84
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forwardable.rb
6.16
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ftools.rb
6.17
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generator.rb
8.1
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getoptlong.rb
14.88
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getopts.rb
2.25
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gserver.rb
6.43
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importenv.rb
590
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ipaddr.rb
21.96
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irb.rb
7.43
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jcode.rb
4.3
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kconv.rb
8.12
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logger.rb
17.59
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mailread.rb
1.28
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mathn.rb
5.42
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matrix.rb
27.21
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md5.rb
411
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mkmf.rb
50.65
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monitor.rb
7.93
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mutex_m.rb
2.07
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observer.rb
5.15
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open-uri.rb
20.49
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open3.rb
2.1
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openssl.rb
575
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optparse.rb
47.12
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ostruct.rb
3.35
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parsearg.rb
1.55
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parsedate.rb
1.33
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pathname.rb
29.39
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ping.rb
1.48
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pp.rb
15.97
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prettyprint.rb
18.33
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profile.rb
90
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profiler.rb
1.59
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pstore.rb
11.15
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rational.rb
12.05
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readbytes.rb
835
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resolv-replace.rb
1.55
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resolv.rb
56.83
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rss.rb
504
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rubyunit.rb
180
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scanf.rb
20.63
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securerandom.rb
4.27
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set.rb
27.08
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sha1.rb
418
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shell.rb
4.66
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shellwords.rb
3.99
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singleton.rb
8.08
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sync.rb
6.09
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tempfile.rb
4.86
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thread.rb
104
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thwait.rb
4.32
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time.rb
31.58
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timeout.rb
3
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tmpdir.rb
3.69
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tracer.rb
2.73
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tsort.rb
7.99
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un.rb
4.54
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uri.rb
710
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weakref.rb
2.68
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webrick.rb
811
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yaml.rb
12.36
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Code Editor : securerandom.rb
# = Secure random number generator interface. # # This library is an interface for secure random number generator which is # suitable for generating session key in HTTP cookies, etc. # # It supports following secure random number generators. # # * openssl # * /dev/urandom # # == Example # # # random hexadecimal string. # p SecureRandom.hex(10) #=> "52750b30ffbc7de3b362" # p SecureRandom.hex(10) #=> "92b15d6c8dc4beb5f559" # p SecureRandom.hex(11) #=> "6aca1b5c58e4863e6b81b8" # p SecureRandom.hex(12) #=> "94b2fff3e7fd9b9c391a2306" # p SecureRandom.hex(13) #=> "39b290146bea6ce975c37cfc23" # ... # # # random base64 string. # p SecureRandom.base64(10) #=> "EcmTPZwWRAozdA==" # p SecureRandom.base64(10) #=> "9b0nsevdwNuM/w==" # p SecureRandom.base64(10) #=> "KO1nIU+p9DKxGg==" # p SecureRandom.base64(11) #=> "l7XEiFja+8EKEtY=" # p SecureRandom.base64(12) #=> "7kJSM/MzBJI+75j8" # p SecureRandom.base64(13) #=> "vKLJ0tXBHqQOuIcSIg==" # ... # # # random binary string. # p SecureRandom.random_bytes(10) #=> "\016\t{\370g\310pbr\301" # p SecureRandom.random_bytes(10) #=> "\323U\030TO\234\357\020\a\337" # ... begin require 'openssl' rescue LoadError end module SecureRandom # SecureRandom.random_bytes generates a random binary string. # # The argument n specifies the length of the result string. # # If n is not specified, 16 is assumed. # It may be larger in future. # # If secure random number generator is not available, # NotImplementedError is raised. def self.random_bytes(n=nil) n ||= 16 if defined? OpenSSL::Random @pid = 0 if !defined?(@pid) pid = $$ if @pid != pid now = Time.now ary = [now.to_i, now.usec, @pid, pid] OpenSSL::Random.seed(ary.join('.')) @pid = pid end return OpenSSL::Random.random_bytes(n) end if !defined?(@has_urandom) || @has_urandom @has_urandom = false flags = File::RDONLY flags |= File::NONBLOCK if defined? File::NONBLOCK flags |= File::NOCTTY if defined? File::NOCTTY flags |= File::NOFOLLOW if defined? File::NOFOLLOW begin File.open("/dev/urandom", flags) {|f| unless f.stat.chardev? raise Errno::ENOENT end @has_urandom = true ret = f.readpartial(n) if ret.length != n raise NotImplementedError, "Unexpected partial read from random device" end return ret } rescue Errno::ENOENT raise NotImplementedError, "No random device" end end raise NotImplementedError, "No random device" end # SecureRandom.hex generates a random hex string. # # The argument n specifies the length of the random length. # The length of the result string is twice of n. # # If n is not specified, 16 is assumed. # It may be larger in future. # # If secure random number generator is not available, # NotImplementedError is raised. def self.hex(n=nil) random_bytes(n).unpack("H*")[0] end # SecureRandom.base64 generates a random base64 string. # # The argument n specifies the length of the random length. # The length of the result string is about 4/3 of n. # # If n is not specified, 16 is assumed. # It may be larger in future. # # If secure random number generator is not available, # NotImplementedError is raised. def self.base64(n=nil) [random_bytes(n)].pack("m*").delete("\n") end # SecureRandom.random_number generates a random number. # # If an positive integer is given as n, # SecureRandom.random_number returns an integer: # 0 <= SecureRandom.random_number(n) < n. # # If 0 is given or an argument is not given, # SecureRandom.random_number returns an float: # 0.0 <= SecureRandom.random_number() < 1.0. def self.random_number(n=0) if 0 < n hex = n.to_s(16) hex = '0' + hex if (hex.length & 1) == 1 bin = [hex].pack("H*") mask = bin[0] mask |= mask >> 1 mask |= mask >> 2 mask |= mask >> 4 begin rnd = SecureRandom.random_bytes(bin.length) rnd[0] = (rnd[0] & mask).chr end until rnd < bin rnd.unpack("H*")[0].hex else # assumption: Float::MANT_DIG <= 64 i64 = SecureRandom.random_bytes(8).unpack("Q")[0] Math.ldexp(i64 >> (64-Float::MANT_DIG), -Float::MANT_DIG) end end end
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