====== License generator - Technical Specification ====== 

  * This project is currently in the informational stage. Ideas presented here are subject to change or delete.


====== Key Manager ======  

====== License Data ======  
  * The content of the license depend of the version used




===== Version 1 ===== 
  * This license is a text file - we will count number of jump line (\n)

^ Content  ^ Line      ^
| Owner   | 1 |
| Max NetWeaver | 2 |
| Ip | 3 |
| Expiration Date (dd/MM/YYYY)  | 4 |
| Edit/Dev Mode   | 5 |
| Perpetual License| 6 |
| Max Hana Connector| 7 |




===== Version 2 ===== 
  * This license is a text file - we will count number of jump line (\n)

^ Content  ^ Line      ^
| Owner   | 1 |
| Max System | 2 |
| Ip | 3 |
| Expiration Date (dd/MM/YYYY)  | 4 |
| License Type   | 5 |
| Perpetual License| 6 |


===== Version 3 ===== 
  * This license is Json with hashed Key

> Main table

^ Key ^ Value type ^ Description      ^
| uId | long | ClientID used internaly on Key Generator |
| devMode | int | Special flag for dev Mode |
| licenseList| JSON | Every license packed |

> This is the content of eatch **licenseList**

^ Key ^ Value type ^ Description      ^
| productId | long | ProductID ( NETWEAVER / HANA / BUSINESSOBJECTS / AGENT / DATADOG ) |
| trustIp  | string | List of ip allowed to use can be list or mask |
| licenseType | int | Type of License used (Trial/Perpetual/Expiration/OnUseBilling)|
| internalMode | int | Special flag for internal Mode |
| endTime | LocalDate | Expiration Date (dd-MM-YYYY) |
| postCount| int | Number of system/users/agent allowed to run|


====== License Security ======

  * Only Private key distribued (License v1/v2)
 

===== Version Management ===== 

  * New Version will be started by special symbol who not exist in base64

> V1 : None
> V2 : None 
> V3 : $

^Caption ^Effect ^
|Invalid |Error showed to user as invalid Key|
|Error |Error showed to user as typing error|


^Step by Step ^Valid ^Error ^
| Check if empty | next | return 01 |
| Trim Space (In start and in end) | next | NaN |
| Check Length correct | next | return 02 |

→ Version 1/2 (sKey.Length % 4)
^Step by Step v1/2 ^Valid ^Error ^
| Check v3+ header | Goto V3 | next |
| Decrypt License Probe | Valid | Invalid |

→ Version 3+
^Step by Step v3+ ^Valid ^Error ^
| Check Valid header | next | return 03 |
| Remove header | next | NaN |
| Decrypt License NG | Valid | Invalid |

===== Decrypt License Probe ===== 
  

^Step by Step  ^Valid ^Error ^
| Base64 to char | next | Invalid 001 |
| Use RSA/ECB/PKCS1Padding | next | Invalid 002 |
| Extract hash(Sha-256) | next | Invalid 003 |
| Extract seed | next | NaN |
| Create Hash from data | next | Invalid 004 |
| Compare Hash to DataHash | next | Invalid 005 |
| Count number of line (More than 6) | next| Invalid 006 |
| Parse License - ASCII | Valid | Invalid 007 |

===== Decrypt License NG ===== 
 
^Step by Step  ^Valid ^Error ^
| Base64 to char | next | Invalid 001 |
| Extract Key decrypt-key | next | Invalid 008 |
| Decrypt key RSA/ECB/OAEPWITHSHA-256ANDMGF1PADDING| next | Invalid 009 |
| Use key AES/GCM/NoPadding for decrypt Data | next | Invalid 010 |
| Check Valid Json Data | next | Invalid 010 |
| Check valid Key exist (HashedName) | next | Invalid 012 |
| Parse License - JSON | next | Invalid 013 |
 WIP