How can I use System.Hash in Delphi

To use the System.Hash unit in Delphi, you will need to include the unit in your project by adding System.Hash to the uses clause in the implementation section of your code.

Here is an example of how you can use the THashMD5 class from the System.Hash unit to calculate the MD5 hash of a string:

uses
  System.Hash;

var
  Hash: THashMD5;
  Input: string;
  Output: TBytes;
begin
  Input := ‘Hello, world!’;
  Hash := THashMD5.Create;
  try
    Output := Hash.HashBytes(TEncoding.UTF8.GetBytes(Input));
    WriteLn(Output);
  finally
    Hash.Free;
  end;
end.

uses

System.Hash;

var

Hash: THashMD5;

Input: string;

Output: TBytes;

begin

Input := ‘Hello, world!’;

Hash := THashMD5.Create;

try

Output := Hash.HashBytes(TEncoding.UTF8.GetBytes(Input));

WriteLn(Output);

finally

Hash.Free;

end;

end.

The THashMD5 class is a subclass of THash, which provides a common interface for different hash algorithms. The THashMD5 class implements the MD5 hash algorithm, which is a widely used cryptographic hash function that produces a 128-bit hash value.

To calculate the hash of a string, we first need to convert the string to a sequence of bytes using the GetBytes method of the TEncoding class. We can then pass the resulting TBytes array to the HashBytes method of the THashMD5 instance to calculate the hash. The HashBytes method returns a TBytes array containing the hash value.

In this example, we are using the UTF8 encoding to convert the string to bytes. You can also use other encodings, such as ASCII or Unicode.

How can I use System.Hash in Delphi

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