Olive.Hash/Hash.Sha.pp

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{  |   _   .-----.-----.-----.-----.---.-.--|  .-----.  }
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{*******************************************************}
{$mode objfpc}
{$codepage utf8}
{$h+}

unit Hash.Sha;

interface

uses
  SysUtils,
  Classes,
  OpenSSL,
  CTypes;

const
  SHA512_DIGEST_LENGTH = 64;
  SHA384_DIGEST_LENGTH = 48;
  SHA256_DIGEST_LENGTH = 32;
  SHA224_DIGEST_LENGTH = 28;

type
  RTSha = class(TObject)
  public
    constructor Create();
    destructor Destroy();override;
    function Sha1(S: UTF8String): ansistring;
    function Sha224(S: UTF8String): ansistring;
    function Sha256(S: UTF8String): ansistring;
    function Sha384(S: UTF8String): ansistring;
    function Sha512(S: UTF8String): ansistring;
  end;

implementation

constructor RTSha.Create();
var
  HaveOpenSSL : Boolean;
begin
  HaveOpenSSL := InitSSLInterface;
  if not HaveOpenSSL then
  begin
    raise Exception.Create('Please install OpenSSL.') at
    get_caller_addr(get_frame),
    get_caller_frame(get_frame);
  end;
end;

destructor RTSha.Destroy();
begin
  inherited Destroy;
  EVPcleanup;
  DestroySSLInterface;
end;

function RTSha.Sha1(S: UTF8String): ansistring;
var
  Digest : PEVP_MD;
  ShaCTX : PEVP_MD_CTX;
  HexValue : AnsiString;
  BinValue : PChar;
  Hash : PByte;
  DigestLength: pcuint;
begin

  GetMem(Hash, SHA_DIGEST_LENGTH);
  GetMem(DigestLength, SHA_DIGEST_LENGTH);
  GetMem(ShaCTX, SizeOf(PEVP_MD_CTX));
  GetMem(BinValue, SHA_DIGEST_LENGTH*2);
  SetLength(HexValue, SHA_DIGEST_LENGTH*2);

  try
     Digest := EvpGetDigestByName('sha1');
     EVP_DigestInit(ShaCTX, Digest);
     EVP_DigestUpdate(ShaCTX, @S[1], Length(S));
     EVP_DigestFinal(ShaCTX, Hash, DigestLength);
  except

   On e: Exception do
      begin
           WriteLn(e.Message);
           Writeln(e.HelpContext);
           Free;
           exit;
      end;
   end;

  Move(Hash[0], BinValue[0], SHA_DIGEST_LENGTH);

  BinToHex(BinValue, PChar(HexValue), SHA_DIGEST_LENGTH);
  // Cleanup
  FreeMem(Hash);
  FreeMem(DigestLength);
  FreeMem(BinValue);
  Result := LowerCase(HexValue);
end;

function RTSha.Sha224(S: UTF8String): ansistring;
var
  Digest : PEVP_MD;
  ShaCTX : PEVP_MD_CTX;
  HexValue : AnsiString;
  BinValue : PChar;
  Hash : PByte;
  DigestLength: pcuint;
begin

  GetMem(Hash, SHA224_DIGEST_LENGTH);
  GetMem(DigestLength, SHA224_DIGEST_LENGTH);
  GetMem(ShaCTX, SizeOf(PEVP_MD_CTX));
  GetMem(BinValue, SHA224_DIGEST_LENGTH);
  SetLength(HexValue, SHA224_DIGEST_LENGTH*2);
  try
     Digest := EvpGetDigestByName('sha224');
     EVP_DigestInit(ShaCTX, Digest);
     EVP_DigestUpdate(ShaCTX, @S[1], Length(S));
     EVP_DigestFinal(ShaCTX, Hash, DigestLength);
  except

   On e: Exception do
      begin
           WriteLn(e.Message);
           Writeln(e.HelpContext);
           Free;
           exit;
      end;
  end;

  Move(Hash[0], BinValue[0], SHA224_DIGEST_LENGTH);

  BinToHex(BinValue, PChar(HexValue), SHA224_DIGEST_LENGTH);
  // Cleanup
  FreeMem(Hash);
  FreeMem(DigestLength);
  FreeMem(BinValue);

  Result := LowerCase(HexValue);
end;

function RTSha.Sha256(S: UTF8String): ansistring;
var
  Digest : PEVP_MD;
  ShaCTX : PEVP_MD_CTX;
  HexValue : AnsiString;
  BinValue : PChar;
  Hash : PByte;
  DigestLength: pcuint;
begin

  GetMem(Hash, SHA256_DIGEST_LENGTH);
  GetMem(DigestLength, SHA256_DIGEST_LENGTH);
  GetMem(ShaCTX, SizeOf(PEVP_MD_CTX));
  GetMem(BinValue, SHA256_DIGEST_LENGTH);
  SetLength(HexValue, SHA256_DIGEST_LENGTH*2);
  try
     Digest := EvpGetDigestByName('sha256');
     EVP_DigestInit(ShaCTX, Digest);
     EVP_DigestUpdate(ShaCTX, @S[1], Length(S));
     EVP_DigestFinal(ShaCTX, Hash, DigestLength);
  except

   On e: Exception do
      begin
           WriteLn(e.Message);
           Writeln(e.HelpContext);
           Free;
           exit;
      end;
  end;

  Move(Hash[0], BinValue[0], SHA256_DIGEST_LENGTH);

  BinToHex(BinValue, PChar(HexValue), SHA256_DIGEST_LENGTH);
  // Cleanup
  FreeMem(Hash);
  FreeMem(DigestLength);
  FreeMem(BinValue);

  Result := LowerCase(HexValue);

end;

function RTSha.Sha384(S: UTF8String): ansistring;
var
  Digest : PEVP_MD;
  ShaCTX : PEVP_MD_CTX;
  HexValue : AnsiString;
  BinValue : PChar;
  Hash : PByte;
  DigestLength: pcuint;
begin

  GetMem(Hash, SHA384_DIGEST_LENGTH);
  GetMem(DigestLength, SHA384_DIGEST_LENGTH);
  GetMem(ShaCTX, SizeOf(PEVP_MD_CTX));
  GetMem(BinValue, SHA384_DIGEST_LENGTH);
  SetLength(HexValue, SHA384_DIGEST_LENGTH*2);
  try
     Digest := EvpGetDigestByName('sha384');
     EVP_DigestInit(ShaCTX, Digest);
     EVP_DigestUpdate(ShaCTX, @S[1], Length(S));
     EVP_DigestFinal(ShaCTX, Hash, DigestLength);
  except

   On e: Exception do
      begin
           WriteLn(e.Message);
           Writeln(e.HelpContext);
           Free;
           exit;
      end;
  end;

  Move(Hash[0], BinValue[0], SHA384_DIGEST_LENGTH);

  BinToHex(BinValue, PChar(HexValue), SHA384_DIGEST_LENGTH);
  // Cleanup
  FreeMem(Hash);
  FreeMem(DigestLength);
  FreeMem(BinValue);

  Result := LowerCase(HexValue);

end;

function RTSha.Sha512(S: UTF8String): ansistring;
var
  Digest : PEVP_MD;
  ShaCTX : PEVP_MD_CTX;
  HexValue : AnsiString;
  BinValue : PChar;
  Hash : PByte;
  DigestLength: pcuint;
begin

  GetMem(Hash, SHA512_DIGEST_LENGTH);
  GetMem(DigestLength, SHA512_DIGEST_LENGTH);
  GetMem(ShaCTX, SizeOf(PEVP_MD_CTX));
  GetMem(BinValue, SHA512_DIGEST_LENGTH);
  SetLength(HexValue, SHA512_DIGEST_LENGTH*2);
  try
     Digest := EvpGetDigestByName('sha512');
     EVP_DigestInit(ShaCTX, Digest);
     EVP_DigestUpdate(ShaCTX, @S[1], Length(S));
     EVP_DigestFinal(ShaCTX, Hash, DigestLength);
  except

   On e: Exception do
      begin
           WriteLn(e.Message);
           Writeln(e.HelpContext);
           Free;
           exit;
      end;
  end;

  Move(Hash[0], BinValue[0], SHA512_DIGEST_LENGTH);

  BinToHex(BinValue, PChar(HexValue), SHA512_DIGEST_LENGTH);
  // Cleanup
  FreeMem(Hash);
  FreeMem(DigestLength);
  FreeMem(BinValue);

  Result := LowerCase(HexValue);

end;

end.