不同的Delphi/PHP加密解密使用Rijndael

我正试图使用Rijndael加密/解密一个字符串，从php到Delphi再返回。

如果我解密Delphi的PHP字符串。。。工作良好。

如果我用Delphi加密字符串，结果字符串可以，但更短

为了测试，我使用了一个62个字符的字符串。使用delphi加密的字符串长度为PHP 的4个字符

这些字符串。。。最后一个字符：

PHP:GyLWj1anBJRmE8mBsaO5cvTrcbvvvA==

Delphi:GyLWj1anBJRmE8mBsaO5cvTrcbv

谢谢你的任何建议

我使用这个源代码示例：

PHP:

function encrypt ($key, $value)
{
  $padSize = 16 - (strlen ($value) % 16) ;
  $value = $value . str_repeat (chr ($padSize), $padSize) ;
  $output = mcrypt_encrypt (MCRYPT_RIJNDAEL_128, $key, $value, MCRYPT_MODE_CBC, 'xxxxxxx') ;
  return base64_encode ($output) ;
}

Delphi加密：

function EncryptData3(Data: string; AKey: AnsiString; AIv: AnsiString): string;
var
  cipher: TDCP_rijndael;
  key, iv, src, dest, b64: TBytes;
  index, slen, bsize, pad: integer;
begin
  //key := Base64DecodeBytes(TEncoding.UTF8.GetBytes(AKey));
  //iv := Base64DecodeBytes(TEncoding.UTF8.GetBytes(AIv));
  key := TEncoding.ASCII.GetBytes(AKey);
  iv := TEncoding.ASCII.GetBytes(AIv);
  src := TEncoding.ascii.GetBytes(Data);
  cipher := TDCP_rijndael.Create(nil);
  try
    cipher.CipherMode := cmCBC;
    // Add padding.
    // Resize the Value array to make it a multiple of the block length.
    // If it's already an exact multiple then add a full block of padding.
    slen := Length(src);
    bsize := (cipher.BlockSize div 8);
    pad := bsize - (slen mod bsize);
    Inc(slen, pad);
    SetLength(src, slen);
    for index := pad downto 1 do
    begin
      src[slen - index] := pad;
    end;
    SetLength(dest, slen);
    cipher.Init(key[0], 256, @iv[0]); // DCP uses key size in BITS not BYTES
    cipher.Encrypt(src[0], dest[0], slen);
    b64 := Base64EncodeBytes(dest);
    result := TEncoding.Default.GetString(b64);
  finally
    cipher.Free;
  end;
end;

Delphi解密。。。不起作用：

function DecryptData3(Data: string; AKey: AnsiString; AIv: AnsiString): string;
var
  key, iv, src, dest: TBytes;
  cipher: TDCP_rijndael;
  slen, pad: integer;
begin
  //key := Base64DecodeBytes(TEncoding.UTF8.GetBytes(AKey));
  //iv := Base64DecodeBytes(TEncoding.UTF8.GetBytes(AIv));
  key := TEncoding.ASCII.GetBytes(AKey);
  iv := TEncoding.ASCII.GetBytes(AIv);
  src := Base64DecodeBytes(TEncoding.UTF8.GetBytes(Data));
  cipher := TDCP_rijndael.Create(nil);
  try
    cipher.CipherMode := cmCBC;
    slen := Length(src);
    SetLength(dest, slen);
    cipher.Init(key[0], 256, @iv[0]); // DCP uses key size in BITS not BYTES
    cipher.Decrypt(src[0], dest[0], slen);
    // Remove the padding. Get the numerical value of the last byte and remove
    // that number of bytes
    pad := dest[slen - 1];
    SetLength(dest, slen - pad);
    // Base64 encode it
    result := TEncoding.Default.GetString(dest);
  finally
    cipher.Free;
  end;
end;

SetString(stringValue, PAnsiChar(@dest[0]), slen); 
result := Base64Encode2(stringValue);