--- /dev/null
+begin
+ require 'openssl'
+rescue LoadError
+end
+
+begin
+ require 'securerandom'
+rescue LoadError
+end
+
+module ActiveSupport
+ if defined?(::SecureRandom)
+ # Use Ruby 1.9's SecureRandom library whenever possible.
+ SecureRandom = ::SecureRandom # :nodoc:
+ else
+ # = 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
+ # * Win32
+ #
+ # *Note*: This module is based on the SecureRandom library from Ruby 1.9,
+ # revision 18786, August 23 2008. It's 100% interface-compatible with Ruby 1.9's
+ # SecureRandom library.
+ #
+ # == 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"
+ # ...
+ 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
+ return OpenSSL::Random.random_bytes(n)
+ end
+
+ if !defined?(@has_urandom) || @has_urandom
+ 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
+ @has_urandom = false
+ end
+ end
+
+ if !defined?(@has_win32)
+ begin
+ require 'Win32API'
+
+ crypt_acquire_context = Win32API.new("advapi32", "CryptAcquireContext", 'PPPII', 'L')
+ @crypt_gen_random = Win32API.new("advapi32", "CryptGenRandom", 'LIP', 'L')
+
+ hProvStr = " " * 4
+ prov_rsa_full = 1
+ crypt_verifycontext = 0xF0000000
+
+ if crypt_acquire_context.call(hProvStr, nil, nil, prov_rsa_full, crypt_verifycontext) == 0
+ raise SystemCallError, "CryptAcquireContext failed: #{lastWin32ErrorMessage}"
+ end
+ @hProv, = hProvStr.unpack('L')
+
+ @has_win32 = true
+ rescue LoadError
+ @has_win32 = false
+ end
+ end
+ if @has_win32
+ bytes = " " * n
+ if @crypt_gen_random.call(@hProv, bytes.size, bytes) == 0
+ raise SystemCallError, "CryptGenRandom failed: #{lastWin32ErrorMessage}"
+ end
+ return bytes
+ 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
+ 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
+
+ # Following code is based on David Garamond's GUID library for Ruby.
+ def self.lastWin32ErrorMessage # :nodoc:
+ get_last_error = Win32API.new("kernel32", "GetLastError", '', 'L')
+ format_message = Win32API.new("kernel32", "FormatMessageA", 'LPLLPLPPPPPPPP', 'L')
+ format_message_ignore_inserts = 0x00000200
+ format_message_from_system = 0x00001000
+
+ code = get_last_error.call
+ msg = "\0" * 1024
+ len = format_message.call(format_message_ignore_inserts + format_message_from_system, 0, code, 0, msg, 1024, nil, nil, nil, nil, nil, nil, nil, nil)
+ msg[0, len].tr("\r", '').chomp
+ end
+ end
+ end
+end
projects / depot.git / blobdiff