既懂VB又懂C++的哥们请进（答对后，立即给分）

[yeahchang]

哪位能用C++翻译一下！
为什么MSDN只有VB的Code!

Sub VerifySig(ByVal FileToVerify As String, ByVal FileBase As String)
On Error GoTo ErrorHandler

Dim sdContent As String
Dim sdCheck As String
Dim mySD As SignedData
Set mySD = New SignedData

' Open a file and read the signature.
Open FileToVerify For Input As #1
Input #1, sdCheck
Close #1

' Open a file and input the plaintext content that was signed.
Open FileBase For Input As #2
Input #2, sdContent
Close #1

' Set the detached content upon which the signature is based.
mySD.Content = sdContent

' Verify the detached signature.
On Error Resume Next
mySD.Verify sdCheck, True
If Err.Number <> 0 Then
MsgBox "Signature verification failed. " & Err.Description
Else
MsgBox "Verification complete."
End If

' Release the SignedData object.
Set mySD = Nothing

Exit Sub
ErrorHandler:
If Err.Number > 0 Then
MsgBox "VB Error found: " & Err.Description
Else
MsgBox "CAPICOM error found: " & Hex(Err.Number)
End If
End Sub

[yeahchang]

up

[大江大海]

晕！

[yeahchang]

Nobody knows?!!

[tobeatiger]

VB 是开发工具
c＋＋是语言
如果你说用vc 实现同样的功能可能有人比较有空的会帮一下
但不能叫翻译，本人认为应该叫重写，本人愚人

[bu_wen]

你是看不懂 vb 这段代码..还是 不知道 c++ 怎么写这段代码..
很简单的一段代码,,,只要你对 c++ 的有点了解..
写成 c++ 代码并不算难..
自己试试吧..
就是使用了一个SignedData 对象.
Included as a resource in Capicom.dll

[yeahchang]

To bu_wen(不文):
我是学C++的,我看不懂 vb 这段代码.
您对CAPICOM很了解吗?如果是,您能否告诉我:用CAPICOM怎样对被嵌入证书的文件中的证书进行有效性效验?(为的是保证我的文件不被别人修改)．

To tobeatiger(悦) :
感谢您的指正！当然，VB和C++不是一类的，这我知道！我之所以写成C++,是因为我希望有人能将上述代码写成ANSI C++形式,所以没写成VC或BCB.

如果有人能写对，我给100分！

[Mullen]

大意是这样，具体细节可能不对，因为我c++没学好，C#还可以。有些东西时vb有的，我不太清楚c++下的对应。另外，凡是弹出消息的部分都用cout代替了。
该得不好，系能力所限。

void VerifySig(string FileToVerify, string FileBase)
{
try
{
string sdContent;
string sdCheck;
SignedData *mySD = New SignedData;

// Open a file and read the signature.
File *f1 = fopen(FileToVerify,"r");
fprintf(f1, sdCheck);
close(f1);

// Open a file and input the plaintext content that was signed.
File *f2 = fopen(FileBase, "r");
fprintf(f2, sdContent);
close(f2);

// Set the detached content upon which the signature is based.
mySD.Content = sdContent;

// Verify the detached signature.
try
{
mySD.Verify(sdCheck, true);
cout << "Verification complete.";
catch (exception Err)
{
if (Err.Number != 0)
cout << "Signature verification failed. " << Err.Description;
}

// Release the SignedData object.
mySD = null;
catch (exception Err)
{
if (Err.Number > 0)
cout << "VB Error found: " << Err.Description;
else
cout << "CAPICOM error found: " << Hex(Err.Number);
}
}

[yeahchang]

To Mullen(Mullen):花括号有点问题,我正在改!

[yeahchang]

我改成以下的样子了,但
[C++ Error] Unit1.cpp(54): E2316 'Number' is not a member of 'Exception'
[C++ Error] Unit1.cpp(55): E2316 'Description' is not a member of 'Exception'
[C++ Error] Unit1.cpp(61): E2316 'Number' is not a member of 'Exception'
[C++ Error] Unit1.cpp(62): E2316 'Description' is not a member of 'Exception'
[C++ Error] Unit1.cpp(64): E2316 'Number' is not a member of 'Exception'
不知该怎么改!



void VerifySig(char *FileToVerify, char *FileBase,AnsiString Condition)
{
try
{
char *sdContent;
char *sdCheck;


// Open a file and read the signature.
FILE *f1,*f2;
f1= fopen(FileToVerify,"r");
fprintf(f1, sdCheck);
fclose(f1);

// Open a file and input the plaintext content that was signed.
f2= fopen(FileBase, "r");
fprintf(f2, sdContent);
fclose(f2);

// Set the detached content upon which the signature is based.
TSignedData *mySD;
mySD->Content = WideString(sdContent);


// Verify the detached signature.
try
{
mySD->Verify(WideString(sdCheck), true,CAPICOM_VERIFY_SIGNATURE_AND_CERTIFICATE);
Condition="Verification complete.";
}
catch (Exception &Err)
{
if (Err.Number != 0)
Condition="Signature verification failed."+Err.Description;
}
}

catch (Exception &Err)
{
if (Err.Number > 0)
Condition="Error found: "+Err.Description;
else
Condition="CAPICOM error found: "+IntToHex(Err.Number);
}


}

[深渊的水影]

....

[yeahchang]

To Mullen(Mullen):
还有fprintf也用错了，这样是不能往sdContent,sdCheck里写入FileToVerify,FileBase的.（我已改正！）
SignedDate好象需要connect才能用!但要传入ISignedDataPtr的东东，真不知道该怎么解决.

(我怀疑是不是MSDN中的Code根本就有问题，哪位能帮我解决一下)

[yeahchang]

Verifying the Signature on a Document

When a signed document is received, the validity of the signature or signatures can be checked. A signature can be checked for:


Validity of the signature hash
Validity of the signer's certificate
The signature hash is decrypted using the public key of the signer found on the signer's certificate, included as part of the signature. If the decrypted signature matches a new hash of the original document, then the signature was created by the owner of the private key associated with the public key used to decrypt the hash. In addition, the document upon which the signature is based is guaranteed not to have been changed after the signature was created.

The certificate that provided the public key and the identity of the signer can also be checked for validity including such issues as whether the certificate has been revoked, whether the certificate is out of date, or whether the certificate was issued by a trusted certificate issuer.

In the following example, the content signed and the SignedData object are read in from a file and the signature and the validity of the certificate used to create the signature are checked.

Note If the signature is cryptographically invalid or the certificate of the signer is invalid, an exception is raised and the verifying program must handle the exception. On any CAPICOM error, a negative decimal value of Err.Number is returned. For more information, see CAPICOM_ERROR_CODE. For information on positive decimal values of Err.Number, see Winerror.h.




Sub VerifySig(ByVal FileToVerify As String, ByVal FileBase As String)
On Error GoTo ErrorHandler

Dim sdContent As String
Dim sdCheck As String
Dim mySD As SignedData
Set mySD = New SignedData

' Open a file and read the signature.
Open FileToVerify For Input As #1
Input #1, sdCheck
Close #1

' Open a file and input the plaintext content that was signed.
Open FileBase For Input As #2
Input #2, sdContent
Close #1

' Set the detached content upon which the signature is based.
mySD.Content = sdContent

' Verify the detached signature.
On Error Resume Next
mySD.Verify sdCheck, True
If Err.Number <> 0 Then
MsgBox "Signature verification failed. " & Err.Description
Else
MsgBox "Verification complete."
End If

' Release the SignedData object.
Set mySD = Nothing

Exit Sub
ErrorHandler:
If Err.Number > 0 Then
MsgBox "VB Error found: " & Err.Description
Else
MsgBox "CAPICOM error found: " & Hex(Err.Number)
End If
End Sub

[bu_wen]

to; yeahchang(char *yeah,int c)
上面的c++代码应该是差不多了.存在的问题大多是sdk的问题
但我对vc也不是很熟悉..
现在的问题是..SignedData 这个对象在sdk中,哪里有定义呢?
还有就是Vc的异常类了.. 你抛出了一个 Err 对象..vb里有 err.Number 属性.那么vc中如何先定义这个Err类
我觉的你该到 vc 版去问问...

[Mullen]

我对vc++也不熟悉，我是学完c后就学c#了，c++只是偶尔用用，具体的东西很不清楚。