The name is a string of arbitrary length. 1: UUID Namespace_RectalForeignExtractedObject = '8e884ace-bee4-11e4-8dfc-aa07a5b093db' It can be one of the pre-defined ones, or you can make up your own, e.g. The namespace is either a UUID in string representation or an identifier for internally pre-defined namespace UUIDs (currently known are "ns:DNS", "ns:URL", "ns:OID", and "ns:X500"). Now you can have calls: uuid = NameToUUID(Namespace_DNS, 'uuid = NameToUUID(Namespace_DNS, 'uuid = NameToUUID(Namespace_URL, '') įor version 3 and version 5 UUIDs the additional command line arguments namespace and name have to be given. (Note: the endian-ness of your system can affect indices of the above bytes) set high-nibble to 5 to indicate type 5 Copy first 16-bytes of the hash into our Uuid result
#Uuid generator golang code#
Note: All code on stackoverflow is public domain - no attribution required.īyte hash = sha1(NamespaceUUID.ToBytes() + Name.ToBytes()) Now that you have a function that generates a so-called Name, you can have the function (in pseudo-code): UUID NameToUUID(UUID NamespaceUUID, String Name) The basic gist is to only take the first 128 bits, stuff a 5 in the type record, and then set the first two bits of the clock_seq_hi_and_reserved section to 1 and 0, respectively. StackOverflowUrlUUID = sha1(Namespace_URL + "") So, you could hash together: StackOverflowDnsUUID = sha1(Namespace_DNS + "") The UUID RFC pre-defines four namespaces for you: You prefix your string with a so-called namespace to prevent name conflicts. You're probably wondering what is it that I'm supposed to hash. ╰─low nibble is set to 5, to indicate type 5
⭡ ⬑first two bits set to 1 and 0, respectively
Type 6: unofficial idea for sequential UUIDsĮdit: Unofficial type 6 now has an official rfcĪn SHA1 hash outputs 160 bits (20 bytes) the result of the hash is converted into a UUID.Type 5: stuffs an SHA1 hash into 128 bits.Type 4: stuffs random data into 128 bits.Type 3: stuffs an MD5 hash into 128 bits.
#Uuid generator golang mac#
Type 1: stuffs MAC address+ datetime into 128 bits.Type 3 and Type 5 UUIDs are just a technique of stuffing a hash into a UUID:
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