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Methods
U
Constants
UUID_DNS_NAMESPACE = "k\xA7\xB8\x10\x9D\xAD\x11\xD1\x80\xB4\x00\xC0O\xD40\xC8"
 
UUID_URL_NAMESPACE = "k\xA7\xB8\x11\x9D\xAD\x11\xD1\x80\xB4\x00\xC0O\xD40\xC8"
 
UUID_OID_NAMESPACE = "k\xA7\xB8\x12\x9D\xAD\x11\xD1\x80\xB4\x00\xC0O\xD40\xC8"
 
UUID_X500_NAMESPACE = "k\xA7\xB8\x14\x9D\xAD\x11\xD1\x80\xB4\x00\xC0O\xD40\xC8"
 
Class Public methods
uuid_from_hash(hash_class, uuid_namespace, name)

Generates a v5 non-random UUID (Universally Unique IDentifier).

Using Digest::MD5 generates version 3 UUIDs; Digest::SHA1 generates version 5 UUIDs. ::uuid_from_hash always generates the same UUID for a given name and namespace combination.

See RFC 4122 for details of UUID at: www.ietf.org/rfc/rfc4122.txt

# File activesupport/lib/active_support/core_ext/securerandom.rb, line 13
def self.uuid_from_hash(hash_class, uuid_namespace, name)
  if hash_class == Digest::MD5
    version = 3
  elsif hash_class == Digest::SHA1
    version = 5
  else
    raise ArgumentError, "Expected Digest::SHA1 or Digest::MD5, got #{hash_class.name}."
  end

  hash = hash_class.new
  hash.update(uuid_namespace)
  hash.update(name)

  ary = hash.digest.unpack('NnnnnN')
  ary[2] = (ary[2] & 0x0FFF) | (version << 12)
  ary[3] = (ary[3] & 0x3FFF) | 0x8000

  "%08x-%04x-%04x-%04x-%04x%08x" % ary
end
uuid_v3(uuid_namespace, name)

Convenience method for ::uuid_from_hash using Digest::MD5.

# File activesupport/lib/active_support/core_ext/securerandom.rb, line 34
def self.uuid_v3(uuid_namespace, name)
  self.uuid_from_hash(Digest::MD5, uuid_namespace, name)
end
uuid_v5(uuid_namespace, name)

Convenience method for ::uuid_from_hash using Digest::SHA1.

# File activesupport/lib/active_support/core_ext/securerandom.rb, line 39
def self.uuid_v5(uuid_namespace, name)
  self.uuid_from_hash(Digest::SHA1, uuid_namespace, name)
end