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securerandom.rb: Random::Formatter

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* lib/securerandom.rb (Random::Formatter): extract random number
  formatting methods into a module.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-02-14 03:02:32 +00:00
parent 03af53f559
commit 1f13a179d3
1 changed files with 12 additions and 8 deletions
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20
lib/securerandom.rb
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@ -91,7 +91,9 @@ module SecureRandom
ret ret
end end
end end
end
module Random::Formatter
# SecureRandom.hex generates a random hexadecimal string. # SecureRandom.hex generates a random hexadecimal string.
# #
# The argument _n_ specifies the length, in bytes, of the random number to be generated. # The argument _n_ specifies the length, in bytes, of the random number to be generated.
@ -107,7 +109,7 @@ module SecureRandom
# #
# If a secure random number generator is not available, # If a secure random number generator is not available,
# +NotImplementedError+ is raised. # +NotImplementedError+ is raised.
def self.hex(n=nil) def hex(n=nil)
random_bytes(n).unpack("H*")[0] random_bytes(n).unpack("H*")[0]
end end
@ -128,7 +130,7 @@ module SecureRandom
# +NotImplementedError+ is raised. # +NotImplementedError+ is raised.
# #
# See RFC 3548 for the definition of base64. # See RFC 3548 for the definition of base64.
def self.base64(n=nil) def base64(n=nil)
[random_bytes(n)].pack("m*").delete("\n") [random_bytes(n)].pack("m*").delete("\n")
end end
@ -158,7 +160,7 @@ module SecureRandom
# +NotImplementedError+ is raised. # +NotImplementedError+ is raised.
# #
# See RFC 3548 for the definition of URL-safe base64. # See RFC 3548 for the definition of URL-safe base64.
def self.urlsafe_base64(n=nil, padding=false) def urlsafe_base64(n=nil, padding=false)
s = [random_bytes(n)].pack("m*") s = [random_bytes(n)].pack("m*")
s.delete!("\n") s.delete!("\n")
s.tr!("+/", "-_") s.tr!("+/", "-_")
@ -182,7 +184,7 @@ module SecureRandom
# p SecureRandom.random_number #=> 0.596506046187744 # p SecureRandom.random_number #=> 0.596506046187744
# p SecureRandom.random_number #=> 0.350621695741409 # p SecureRandom.random_number #=> 0.350621695741409
# #
def self.random_number(n=0) def random_number(n=0)
if 0 < n if 0 < n
if defined? OpenSSL::BN if defined? OpenSSL::BN
OpenSSL::BN.rand_range(n).to_i OpenSSL::BN.rand_range(n).to_i
@ -195,7 +197,7 @@ module SecureRandom
mask |= mask >> 2 mask |= mask >> 2
mask |= mask >> 4 mask |= mask >> 4
begin begin
rnd = SecureRandom.random_bytes(bin.length) rnd = random_bytes(bin.length)
rnd[0] = (rnd[0].ord & mask).chr rnd[0] = (rnd[0].ord & mask).chr
end until rnd < bin end until rnd < bin
rnd.unpack("H*")[0].hex rnd.unpack("H*")[0].hex
@ -205,7 +207,7 @@ module SecureRandom
if defined? OpenSSL::BN if defined? OpenSSL::BN
i64 = OpenSSL::BN.rand(64, -1).to_i i64 = OpenSSL::BN.rand(64, -1).to_i
else else
i64 = SecureRandom.random_bytes(8).unpack("Q")[0] i64 = random_bytes(8).unpack("Q")[0]
end end
Math.ldexp(i64 >> (64-Float::MANT_DIG), -Float::MANT_DIG) Math.ldexp(i64 >> (64-Float::MANT_DIG), -Float::MANT_DIG)
end end
@ -222,10 +224,12 @@ module SecureRandom
# #
# See RFC 4122 for details of UUID. # See RFC 4122 for details of UUID.
# #
def self.uuid def uuid
ary = self.random_bytes(16).unpack("NnnnnN") ary = random_bytes(16).unpack("NnnnnN")
ary[2] = (ary[2] & 0x0fff) | 0x4000 ary[2] = (ary[2] & 0x0fff) | 0x4000
ary[3] = (ary[3] & 0x3fff) | 0x8000 ary[3] = (ary[3] & 0x3fff) | 0x8000
"%08x-%04x-%04x-%04x-%04x%08x" % ary "%08x-%04x-%04x-%04x-%04x%08x" % ary
end end
end end
SecureRandom.extend(Random::Formatter)