DCPCrypt / Delphi无法正确编码Rijndael [英] DCPCrypt/Delphi not properly encoding Rijndael

问题描述

我有DCPCrypt软件包（最新版本），并尝试使用Delphi2007中的AES / Rijndael CBC编码（128位块，256位密钥），使用NIST分发的AES已知答案测试（KAT）向量中的测试值进行编码。一个样本测试向量：

I have the DCPCrypt package (latest version) and am trying to do AES/Rijndael CBC encoding (128 bit blocks, 256 bit key) in Delphi2007 with test values from the AES Known Answer Test (KAT) Vectors distributed by NIST. One sample test vector:

KEY = 0000000000000000000000000000000000000000000000000000000000000000  
IV = 00000000000000000000000000000000  
PLAINTEXT = 80000000000000000000000000000000  
CIPHERTEXT = ddc6bf790c15760d8d9aeb6f9a75fd4e

以下代码返回：

Cyphertext (bytes): 58 215 142 114 108 30 192 43 126 191 233 43 35 217 236 52  
Cyphertext (hex): 3AD78E726C1EC02B7EBFE92B23D9EC34  
Cyphertext (base64): OteOcmwewCt+v+krI9nsNA==  

这显然是不正确的。

procedure TFrmKATVectors.TestData(Key,IV,PlainText: String);  
var  
  InBuf,OutBuf: TestBuffer;  
  KeyBuf: KeyBuffer;  
  IVBuf: IVBuffer;  
  l,i: Integer;  
  Bytes,  
  SOut: String;  
begin  
  Memo1.Lines.Add('Key: ' + Key);  
  Memo1.Lines.Add('IV: ' + IV);  
  Memo1.Lines.Add('Plaintext: ' + Plaintext);  
  l := Length(Key) DIV 2;  
  for i := 1 to l do KeyBuf[i] := HexToInt(Copy(Key,2*(i-1)+1,2));  
  l := Length(IV) DIV 2;  
  for i := 1 to l do IVBuf[i] := HexToInt(Copy(IV,2*(i-1)+1,2));  
  l := Length(PlainText) DIV 2;  
  for i := 1 to l do InBuf[i] := HexToInt(Copy(PlainText,2*(i-1)+1,2));  
  DCP_rijndael1.Init(KeyBuf,32,@IVBuf);  
  DCP_rijndael1.EncryptCBC(InBuf,OutBuf,TestBufSize);  
  SOut := '';  
  for i := 1 to Length(OutBuf) do
   begin
     SOut := SOut + Chr(OutBuf[i]);
     Bytes := Bytes + IntToStr(OutBuf[i]) + ' ';
   end;  
  Memo1.Lines.Add('Cyphertext (bytes): ' + Bytes); 
  Memo1.Lines.Add('Cyphertext (hex): ' + StringToHex(SOut));  
  Memo1.Lines.Add('Cyphertext (base64): ' + Base64EncodeStr(SOut));  
  Memo1.Lines.Add('');  
end;

我在打电话

TestData('0000000000000000000000000000000000000000000000000000000000000000',
         '00000000000000000000000000000000', '80000000000000000000000000000000');

有

const
TestBufSize = 16;

type  
TestBuffer = packed Array[1..TestBufSize] of Byte;  
KeyBuffer = packed Array[1..32] of Byte;  
IVBuffer = packed Array[1..16] of Byte;  

鉴于测试数据的长度，我避免了任何填充问题。
我在做什么错？有什么建议吗？

Given the length of my test data I'm avoiding any padding issues. What am I doing wrong? Any suggestions?

（不，您不必重新计算参数字符串的长度-我已经做了几次。）

(No, you don't have to recount the parameter string lengths - I did that several times.)

推荐答案

Init方法中的密钥大小参数以位为单位-如方法注释所述：

Key size parameter in Init method is in bits - as stated by the method comment:

根据Key中的数据执行密钥设置，大小以位为单位

计算密钥大小为32位的AES，这是无效的。

You are calculating the AES with KeySize = 32 bits, which is invalid.

因此，您需要计算最小可用密钥大小，即128。返回值对于128位是正确的-参见 http://csrc.nist.gov/groups/STM/ cavp / documents / aes / AESAVS.pdf 第20页。

So you compute for the lowest available Keysize, which is 128. The returned value is correct for 128 bit - see http://csrc.nist.gov/groups/STM/cavp/documents/aes/AESAVS.pdf page 20.

尝试指定256位作为密钥大小：

Try to specify 256 bits as key size:

 DCP_rijndael1.Init(KeyBuf,256,@IVBuf);  

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