This is a port to DotNet Framework, DotNet Core and PHP from the original Python3 code made by DoubleLabyrinth

Original repository

• NOTICE: The text below is copy/pasted from DoubleLabyrinth, all credits go to him

How Does Navicat Encrypt/Decrypt Passwords?

1. What is Navicat?

• Navicat is a series of graphical database management and development software produced by PremiumSoft CyberTech Ltd. for MySQL, MariaDB, Oracle, SQLite, PostgreSQL and Microsoft SQL Server.

• It has an Explorer-like graphical user interface and supports multiple database connections for local and remote databases. Its design is made to meet the needs of a variety of audiences, from database administrators and programmers to various businesses/companies that serve clients and share information with partners.

• See Navicat's website for more information about Navicat

2. What does indicate that Navicat encrypts password?

• If you use Navicat to manage one of your databases, the first thing you should do is to create a connection to the database. So that means you should fill textboxes on the window showed below with the database's information like host name, User name, Password and so on.

• If you check "Save Password", after you click "Ok" button, Navicat will encrypt the password and then save the connection configuration, containing encrypted password, in Windows Registry. The exact path is showed below:

  Database Type	Path
  MySQL	HKEY_CURRENT_USER\Software\PremiumSoft\Navicat\Servers\<your connection name>
  MariaDB	HKEY_CURRENT_USER\Software\PremiumSoft\NavicatMARIADB\Servers\<your connection name>
  Microsoft SQL	HKEY_CURRENT_USER\Software\PremiumSoft\NavicatMSSQL\Servers\<your connection name>
  Oracle	HKEY_CURRENT_USER\Software\PremiumSoft\NavicatOra\Servers\<your connection name>
  PostgreSQL	HKEY_CURRENT_USER\Software\PremiumSoft\NavicatPG\Servers\<your connection name>
  SQLite	HKEY_CURRENT_USER\Software\PremiumSoft\NavicatSQLite\Servers\<your connection name>

3. How does Navicat encrypt password?

Navicat use blowfish algorithm to encrypt password string. Here below is what Navicat did:

1. Generate Key.

• Navicat use SHA-1 algorithm to generate a 160-bits' key.
• The SHA-1 digest of an ASCII string---"3DC5CA39", 8 bytes long---is the key used in blowfish cipher.
• The exact value is: unsigned char Key[20] = { 0x42, 0xCE, 0xB2, 0x71, 0xA5, 0xE4, 0x58, 0xB7, 0x4A, 0xEA, 0x93, 0x94, 0x79, 0x22, 0x35, 0x43, 0x91, 0x87, 0x33, 0x40 };

2. Initialize Initial Vector(IV)

• We know that blowfish algorithm could only encrypt an 8-bytes-long block every time.
• At the beginning, Navicat fills an 8-bytes-long block with 0xFF, then uses blowfish algorithm encrypt the block by the key mentioned above. After that the 8-bytes-long block is Initial Vector(IV).
• The exact value of IV is:

unsigned char IV[8] = { 0xD9, 0xC7, 0xC3, 0xC8, 0x87, 0x0D, 0x64, 0xBD };

3. Encrypt Password String.

• NOTICE: Here, the password string is an ASCII string, and we DO NOT consider the "NULL" terminator.
• Navicat use a pipeline to encrypt password string. The pipeline is showed below:

• NOTICE: Every plaintext block is an 8-bytes-long block. Only when the last plaintext block is not 8-bytes-long, will the last step showed in the picture above be executed. Otherwise, the last step is just like the middle two steps.

4. Store The Encrypted Password.

• The encrypted password stored in Windows Registry is the join of hex strings of every cipher blocks.