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require "securerandom"
module Digest
module UUID
DNS_NAMESPACE = "k\xA7\xB8\x10\x9D\xAD\x11\xD1\x80\xB4\x00\xC0O\xD40\xC8" #:nodoc:
URL_NAMESPACE = "k\xA7\xB8\x11\x9D\xAD\x11\xD1\x80\xB4\x00\xC0O\xD40\xC8" #:nodoc:
OID_NAMESPACE = "k\xA7\xB8\x12\x9D\xAD\x11\xD1\x80\xB4\x00\xC0O\xD40\xC8" #:nodoc:
X500_NAMESPACE = "k\xA7\xB8\x14\x9D\xAD\x11\xD1\x80\xB4\x00\xC0O\xD40\xC8" #:nodoc:
# 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: http://www.ietf.org/rfc/rfc4122.txt
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
# Convenience method for uuid_from_hash using Digest::MD5.
def self.uuid_v3(uuid_namespace, name)
uuid_from_hash(Digest::MD5, uuid_namespace, name)
end
# Convenience method for uuid_from_hash using Digest::SHA1.
def self.uuid_v5(uuid_namespace, name)
uuid_from_hash(Digest::SHA1, uuid_namespace, name)
end
# Convenience method for SecureRandom.uuid.
def self.uuid_v4
SecureRandom.uuid
end
end
end
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