| 1,11 → 1,13 |
|---|
| # OIDplus Information Object GUID format |
| |
| ## OIDplus Information Object GUID |
| |
| OIDplus automatically assigns a UUID to every object it manages. It is based on the custom UUID type (UUIDv8) which was defined in the new version of RFC 4122. |
| |
| |Block| Byte | Length | Description | |
| |-----|------|---------|----------------------| |
| | 1 | 0-3 | 1 bit | Reserved, must be 0. |
| | | | 31 bits | OIDplus SystemID (lower 31 bits of SHA1 of Public Key); 0 if not available |
| | | | 31 bits | OIDplus SystemID (lower 31 bits of SHA1 of Public Key) |
| | 2 | 4-5 | 16 bits | Creation timestamp: Days since 01.01.1970 00:00 GMT; 0 if unknown. Max possible: 0xFFFF = 06 June 2149 |
| | 3 | 6-7 | 4 bits | UUID Version, must be 0x8 (Custom UUID) |
| | | | 12 bits | Reserved, must be 0x0000 |
| 13,9 → 15,8 |
|---|
| | | | 14 bits | Namespace (lower 14 bits of SHA1 of Namespace OID) |
| | 5 |10-15 | 48 bits | Object name (lower 48 bits of SHA1 of canonical object name) |
| |
| ### Example |
| |
| ## Example |
| |
| The object **java:com.example**, created 30 September 2018 on system #1855139287 has the following UUID: |
| |
| 6e932dd7-458c-8000-b9e9-c1e3894d1105 |
| 30,10 → 31,44 |
|---|
| | 4 | Namespace+Variant | 0xB9E9 | SHA1('1.3.6.1.4.1.37476.2.5.2.4.8.6') & 0x3FFF \| 0x8000 |
| | 5 | Object Name | 0xC1E3894D1105 | SHA1('com.example') & 0xFFFF.FFFF.FFFF |
| |
| |
| ## OIDplus System GUID |
| |
| Every OIDplus system can be identified by a UUID generated using this schema based on the Information Object UUID. |
| |
| |Block| Byte | Length | Description | |
| |-----|------|---------|----------------------| |
| | 1 | 0-3 | 1 bit | Reserved, must be 0. |
| | | | 31 bits | OIDplus SystemID (lower 31 bits of SHA1 of Public Key) |
| | 2 | 4-5 | 16 bits | Reserved for system creation timestamp. Currently 0 because OIDplus does not track the timestamp of a new system. |
| | 3 | 6-7 | 4 bits | UUID Version, must be 0x8 (Custom UUID) |
| | | | 12 bits | Reserved, must be 0x0000 |
| | 4 | 8-9 | 2 bits | UUID Variant, must be 0b10 (RFC 4122) |
| | | | 14 bits | Namespace: Fix value of 0. |
| | 5 |10-15 | 48 bits | Object name: Fix 0x1890afd80709 (lower 48 bits of SHA1 of an empty string) |
| |
| ### Example |
| |
| The system #1855139287 has the following UUID: |
| |
| 6e932dd7-0000-8000-8000-1890afd80709 |
| |
| It contains the information as follows: |
| |
| |Block| Description | Value | Interpretation | |
| |-----|-------------------|----------------|----------------| |
| | 1 | System ID | 0x6E932DD7 | SHA1(PubKey) & 0x7FFF.FFFF = 1855139287 |
| | 2 | Timestamp | 0x0000 | Unknown |
| | 3 | Reserved+Version | 0x8000 | 0x0000 \| 0x8000 |
| | 4 | Namespace+Variant | 0x8000 | 0x0000 \| 0x8000 |
| | 5 | Object Name | 0xC1E3894D1105 | SHA1('') & 0xFFFF.FFFF.FFFF |
| |
| |
| ## Known namespaces |
| |
| | Vendor |Namespace| OID | SHA1 hash | Block 4| Notes | |
| |--------------|---------|--------------------------------|-----------|--------|--------------| |
| | n/a | n/a | n/a | n/a | 0x8000 | System |
| | ViaThinkSoft | doi | 1.3.6.1.4.1.37476.2.5.2.4.8.1 | 0x...2259 | 0xA259 | |
| | ViaThinkSoft | gs1 | 1.3.6.1.4.1.37476.2.5.2.4.8.2 | 0x...021E | 0x821E | |
| | ViaThinkSoft | guid | 1.3.6.1.4.1.37476.2.5.2.4.8.3 | 0x...B924 | 0xB924 | In OIDplus, only the UUID itself will be shown |
| 255,6 → 290,7 |
|---|
| $block4 = dechex(hexdec(substr(sha1('1.3.6.1.4.1.37476.2.5.2.4.8.'.$i), -4)) & 0x3FFF | 0x8000); |
| $coll[] = $block4; |
| } |
| $coll[] = dechex(0x8000); // System |
| $block4 = dechex(hexdec(substr(sha1($plugin_oid), -4)) & 0x3FFF | 0x8000); |
| if (in_array($block4, $coll)) { |
| echo "HASH CONFLICT\n"; |