Endianness of Active Directory objectUUID Attributes in Java / Apache Directory Studio -


i connecting active directory server java. add property:

 env.put("java.naming.ldap.attributes.binary", "objectguid");

and read objecuuid this:

attribute = result.getattributes().get("objectuuid"); byte[] b = (byte[])a.get();

and format this:

string id = hex.     encodehexstring(b).     replaceall(        "(.{8})(.{4})(.{4})(.{4})(.{12})",         "$1-$2-$3-$4-$5"     ) );

the result nicely format uuid. when want find entry uuid, remove dashes:

id = id.replaceall("[^a-za-z0-9]+", "");

and insert backslashes:

id = id.replaceall("([a-za-z0-9]{2,2})", "\\\\$1");

this works nicely. having problem fact apache directory studio shows (for example) user's uuid as:

 8e591e3a-35ab-45cc-8dca-c5e451adc975

wheras code shows uuid of same entry as:

 3a1e598e-ab35-cc45-8dca-c5e451adc975

as can see, high- , low order bytes swapped left 8 bytes, identical on right side. why that? seems weird ...

.rm

if here:

https://en.wikipedia.org/wiki/universally_unique_identifier

name                               length (bytes) length (hex digits) contents time_low                           4              8                   integer giving low 32 bits of time time_mid                           2              4                   integer giving middle 16 bits of time time_hi_and_version                2              4                   4-bit "version" in significant bits, followed high 12 bits of time clock_seq_hi_and_res clock_seq_low 2              4                   1-3 bit "variant" in significant bits, followed 13-15 bit clock sequence node                               6              12                  48-bit node id

you can see first 3 segments integers/shorts related "time" data , therefore have endianness, whereas other sections binary data , not.


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