Digest::UUID (original) (raw)

Methods

N

• nil_uuid

U

• uuid_from_hash,
• uuid_v3,
• uuid_v4,
• uuid_v5

Class Public methods

nil_uuid()Link

Returns the nil UUID. This is a special form of UUID that is specified to have all 128 bits set to zero.

Source: show | on GitHub

def self.nil_uuid "00000000-0000-0000-0000-000000000000" end

uuid_from_hash(hash_class, namespace, name)Link

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

Using OpenSSL::Digest::MD5 generates version 3 UUIDs; OpenSSL::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

Source: show | on GitHub

def self.uuid_from_hash(hash_class, namespace, name) if hash_class == Digest::MD5 || hash_class == OpenSSL::Digest::MD5 version = 3 elsif hash_class == Digest::SHA1 || hash_class == OpenSSL::Digest::SHA1 version = 5 else raise ArgumentError, "Expected OpenSSL::Digest::SHA1 or OpenSSL::Digest::MD5, got #{hash_class.name}." end

uuid_namespace = pack_uuid_namespace(namespace)

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)Link

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

Source: show | on GitHub

def self.uuid_v3(uuid_namespace, name) uuid_from_hash(OpenSSL::Digest::MD5, uuid_namespace, name) end

uuid_v4()Link

Convenience method for SecureRandom.uuid.

uuid_v5(uuid_namespace, name)Link

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

Source: show | on GitHub

def self.uuid_v5(uuid_namespace, name) uuid_from_hash(OpenSSL::Digest::SHA1, uuid_namespace, name) end