A library to help you hash passwords. You can read about bcrypt in Wikipedia as well as in the following article: How To Safely Store A Password

For ease I recommend using the Boss (Dependency Manager for Delphi) for installation, simply by running the command below on a terminal (Windows PowerShell for example):

boss install https://github.com/viniciussanchez/bcrypt

If you choose to install manually, simply add the following folders to your project, in Project > Options > Resource Compiler > Directories and Conditionals > Include file search path

../bcrypt/src

var
  LHash: string;
begin
  LHash := TBCrypt.GenerateHash(password, cost, type);
end;

Where

• password is the password to be hashed
• type is one of THashType.PHP, THashType.BSD, or THashType.Default, THashType.BSD is the default $2a$
• cost is a number between 10 and 30, default is 10

var
  LVerify : Boolean;
begin
  LVerify := TBCrypt.CompareHash(password, hash);
end;

Where

• password is the password to be verified
• hash is a hash generated, similar to $2y$12$GuC.Gk2YDsp8Yvga.IuSNOWM0fxEIsAEaWC1hqEI14Wa.7Ps3iYFq

var
  LHashInfo: THashInfo;
  LSalt, LHash: string;
  LHashType: THashType;
  LCost: Word;
begin
  LHashInfo := TBCrypt.GetHashInfo(hash);
  LCost := LHashInfo.Cost;
  LSalt := LHashInfo.Salt;
  LHash := LHashInfo.Hash;
  LHashType := LHashInfo.&Type;

Where

• hash is a hash generated

var
  LNeeds : Boolean;
begin
  LNeeds := TBCrypt.NeedsRehash(hash, cost);
end;

Where

• hash is a hash, similar to $2y$12$GuC.Gk2YDsp8Yvga.IuSNOWM0fxEIsAEaWC1hqEI14Wa.7Ps3iYFq
• cost is a number between 10 and 30, default is 10

The characters that comprise the resultant hash are:

./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789

Resultant hashes will be 60 characters long.

The code for this comes from a few sources:

• Free Pascal BCrypt
• BCrypt for Delphi