我想在二进制数据上使用RSA签名和验证,但它只是不工作,无论如何,RSA.VerifyData总是返回false。无法让我的RSA签名/验证BINARY数据正常工作。任何工作示例?
基本上我有一个对象,它是二进制序列化:
public class MyObject {
public OtherClass Property1 { get; set; }
public Trailer Trailer { get; set; }
}
public class Trailer {
public byte[] Hash {get;set; } // Any hash
public byte[] Signature {get;set; }
}
基本上对象都有自己的属性设置,这里只是一个(Property1)。然后我计算没有预告片的对象上的散列,并将其放在Trailer.Hash上。然后我通过Property1,Trailer.Hash和Trailer.Signature = null计算RSA签名。我正在用DataContractSerializer进行二进制序列化。
问题是,当我检索哈希是好的,它也很好地重新生成(加载时重新计算),但签名验证失败。尝试了很多方法,但似乎没有任何工作。
任何人都可以指出我想做什么的工作例子吗?我可以签署一个字符串并验证它,但使用二进制数据我无法使它工作。如需更详细的代码在Github上查看我的Gist/
public void Save(SampleObject model, byte[] cspBlob, string outFilename)
{
// Calculate the HMACSHA256 over a model with null Trailer section
CheckTrailer check = new CheckTrailer(); // empty keyed hash and empty signature
model.Check = null; // both HMAC & Signature are irrelevant for Save because we calculate them here
check.Trailer1 = model.GetKeyedHash<HMACSHA256>(GetKey());
DataContractSerializer serializer = new DataContractSerializer(model.GetType());
using (MemoryStream memoryStream = new MemoryStream())
{
model.Check = check;
// serialize with keyed hash and empty signature
serializer.WriteObject(memoryStream, model);
CspParameters cspparams = new CspParameters { Flags = CspProviderFlags.CreateEphemeralKey };
using (RSACryptoServiceProvider rsaSign = new RSACryptoServiceProvider(cspparams))
{
rsaSign.ImportCspBlob(cspBlob); // must be a key pair blob
if (rsaSign.PublicOnly)
{
throw new CryptographicException("Cannot sign with PUK");
}
check.Trailer2 = rsaSign.SignData(memoryStream, HashAlgorithm.Create(DSIG_HASH));
Console.WriteLine("\tDSIG: {0}", BitConverter.ToString(check.Trailer2));
}
}
// Place the computed signature
model.Check.Trailer2 = check.Trailer2;
// serialize
IFormatter formatter = new BinaryFormatter();
using (Stream stream = new FileStream(outFilename, FileMode.Create, FileAccess.Write, FileShare.None))
{
formatter.Serialize(stream, model);
}
} // Save()
太感谢了。我怎么会忘了这样一个基本的错误!太感谢了! –