Checksum & Hashing library for Lazarus

The goal is the create a library which is modular, fast and portable. There is no platform-specific code, no Assembly, no includes, no conditinal defines. Every algorith has it's own separate file and if you need just one algorithm in your program you can just copy 2 files- the file with the algorithm you need and "HasherBase.pas". Optionally you can copy "Hasher.pas" but that's just a helper class.

Available algorithms

More soon...

• CRC-4 interlaken,
• CRC-6 DARC, CRC-6 G704,
• CRC-7 mmc, CRC-7 umts,
• CRC-8 AUTOSAR, CRC-8 BLUETOOTH, CRC-8 CDMA2000, CRC-8 DARC, CRC-8 DVBS2, CRC-8 GSMA, CRC-8 GSMB, CRC-8 HITAG, CRC-8 I4321, CRC-8 ICODE, CRC-8 LTE, CRC-8 MAXIMDOW, CRC-8 MIFAREMAD, CRC-8 NRSC5, CRC-8 OPENSAFETY, CRC-8 ROHC, CRC-8 SAEJ1850, CRC-8 SMBUS, CRC-8 TECH3250, CRC-8 WCDMA,
• CRC-10 atm, CRC-10 gsm, CRC-10 cdma2000,
• CRC-11 flexray, CRC-11 umts,
• CRC-12 gsm, CRC-12 dect, CRC-12 cdma2000,
• CRC-13 bbc,
• CRC-14 gsm,
• CRC-15 can, CRC-15 MPT1327,
• CRC-16 ARC, CRC-16 CDMA2000, CRC-16 CMS, CRC-16 DDS110, CRC-16 DECTR, CRC-16 DECTX, CRC-16 DNP, CRC-16 EN13757, CRC-16 GENIBUS, CRC-16 GSM, CRC-16 IBM3740, CRC-16 IBMSDLC, CRC-16 KERMIT, CRC-16 LJ1200, CRC-16 M17, CRC-16 MAXIMDOW, CRC-16 MCRF4XX, CRC-16 MODBUS, CRC-16 NRSC5, CRC-16 OPENSAFETYA, CRC-16 OPENSAFETYB, CRC-16 PROFIBUS, CRC-16 SPIFUJITSU, CRC-16 T10DIF, CR-C16 TELEDISK, CRC-16 UMTS, CRC-16 USB, CRC-16 XMODEM,
• CRC-17 canfd,
• CRC-21 canfd,
• CRC-24 OS9, CRC-24 FLEXRAYA, CRC-24 FLEXRAYB, CRC-24 INTERLAKEN, CRC-24 LTEA, CRC-24 LTEB, CRC-24 OPENPGP,
• CRC-30 cdma,
• CRC-31 philips,
• CRC-32 MPEG2, CRC32 JAMCRC,
• CRC-40 gsm,
• CRC-64, CRC-64 ecma, CRC-64 go, CRC-64 ecma 182, CRC-64 xz, CRC-64 ms,
• CRC-82 darc,
• Adler8, Adler16, Adler32, Adler64,
• cksum mpeg2,
• Fletcher8, Fletcher16, Fletcher32, Fletcher64,
• SIZE64, Sum BSD, Sum SYSV,
• SUM8, SUM16, SUM24, SUM32, SUM64,
• XOR8, XOR16, XOR32
• xxHash32
• MurmurHash, MurmurHash2, MurmurHash2a, MurmurHash3
• SHA-0, SHA-1, SHA-224, SHA-256

PHP port available

https://github.com/PascalVault/PHP_Hashing

Usage examples

hashing a String

uses Hasher;

var Hasher: THasher;
    Hash: String;
begin
  try
    Hasher := THasher.Create('CRC-32 JAMCRC');
    Hasher.Update('123456789');
    Hash := Hasher.Final;
    Hasher.Free;
    
    Memo1.Lines.Add( Hash );
  finally
  end; 

hashing a Stream

uses Hasher;

var Hasher: THasher;
    Hash: String;
    Msg: TMemoryStream;
begin
  try
    Msg := TMemoryStream.Create;
    Hasher := THasher.Create('CRC-32 JAMCRC');
    Hasher.Update(Msg);
    Hash := Hasher.Final;
    Hasher.Free;
    
    Memo1.Lines.Add( Hash );
  finally
    Msg.Free;
  end; 

hashing a file

 uses Hasher;

var Hasher: THasher;
    Hash: String;
begin
  try       
    Hasher := THasher.Create('CRC-32 JAMCRC');
    Hasher.UpdateFile('directory/file.exe');
    Hash := Hasher.Final;
    Hasher.Free;
    
    Memo1.Lines.Add( Hash );
  finally
  end; 

Using classes directly- without THasher

hashing a String

uses CRC64;

var Hasher: THasherCRC64;
    Hash: String;
    Msg: String;
begin
  Msg := '123456789';
  Hasher := THasherCRC64.Create;
  Hasher.Update(@Msg[1], Length(Msg));
  Hash := Hasher.Final;
  Hasher.Free;

  Memo1.Lines.Add( Hash );
end;

hashing an Array

uses CRC64;

var Hasher: THasherCRC64;
    Hash: String;
    Msg: array of Byte;
    Len: Integer;
begin
  SetLength(Msg, Len);
  Hasher := THasherCRC64.Create;
  Hasher.Update(@Msg[0], Len);
  Hash := Hasher.Final;
  Hasher.Free;

  Memo1.Lines.Add( Hash );
end;