DELPHI HMAC256

DELPHI HMAC256

 

unit HMAC;

interface

uses
  System.SysUtils,
  EncdDecd,
  IdHMAC,
  IdSSLOpenSSL,
  IdHash;

type
  THMACUtils = class
  public
    class function HMAC(aKey, aMessage: RawByteString): TBytes;
    class function HMAC_HexStr(aKey, aMessage: RawByteString): RawByteString;
    class function HMAC_Base64(aKey, aMessage: RawByteString): RawByteString;
  end;

implementation

class function THMACUtils.HMAC(aKey, aMessage: RawByteString): TBytes;
var
  _HMAC: T;
begin
  if not IdSSLOpenSSL.LoadOpenSSLLibrary then Exit;
  _HMAC:= T.Create;
  try
    _HMAC.Key := BytesOf(aKey);
    Result:= _HMAC.HashValue(BytesOf(aMessage));
  finally
    _HMAC.Free;
  end;
end;

class function THMACUtils.HMAC_HexStr(aKey, aMessage: RawByteString): RawByteString;
var
  I: Byte;
begin
  Result:= '0x';
  for I in HMAC(aKey, aMessage) do
    Result:= Result + IntToHex(I, 2);
end;

class function THMACUtils.HMAC_Base64(aKey, aMessage: RawByteString): RawByteString;
var
  _HMAC: TBytes;
begin
  _HMAC:= HMAC(aKey, aMessage);
  Result:= EncodeBase64(_HMAC, Length(_HMAC));
end;

end.

下面是调用的例子：

program HMACSample;

{$APPTYPE CONSOLE}

{$R *.res}

uses
  System.SysUtils,
  HMAC,
  IdHMACSHA1,
  IdHashMessageDigest;

begin
  try
    Write('HMAC_SHA1("key", "message")'#9#9'= ');
    Writeln(THMACUtils.HMAC_HexStr('key', 'message' ));
    Writeln;

Write('HMAC_SHA256("key", "message")'#9#9'= ');
    Writeln(THMACUtils.HMAC_HexStr('key', 'message' ));
    Writeln;

Write('HMAC_SHA1_Base64("key", "message")'#9'= ');
    Writeln(THMACUtils.HMAC_Base64('key', 'message' ));
    Writeln;

Write('HMAC_SHA256_Base64("key", "message")'#9'= ');
    Writeln(THMACUtils.HMAC_Base64('key', 'message' ));

Readln;

except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;
end.