加密大字符串成功，加密文件失败-RSA [英] Encrypting large string successful, encrypt file failed - RSA
问题描述
我使用了本文中的一篇文章来生成我的代码，我将输入/输出字符串替换为字节，并且还进行了一些更改 ^ ]
我把它放在测试项目中，并上传到这里:
https://skydrive.live.com/embed?cid=DD24375C87B5BE07&resid= DD24375C87B5BE07％21586& authkey = ABdnCLJ8M3UTcAc [ ^ ]
我使用string完成了这两种方法，它也可以按照自己的文章程序所示工作，另一种方法是我传递给序列化的方法，但失败了:-/
同样由于本文的方法，将值拆分并合并，所以我可以说他想到了不对称密钥算法无法处理的大数据...
但我不知道为什么我失败了?
我删除了输出的基础65''es，并编写了一个小字节的[] appender算法，因此我直接将我的值传递给输出，但是接下来我在解密器中遇到错误，我不知道.Net如何处理这种编码，并且我正在寻找您的丰富帮助:|
您可以启动加密程序并查看重新启动信息，..."false"表示运行...
-------------------------------------------------- ----
这是我第二次尝试的内容:
i used one of article in here to generate my code, i replace input/output string with bytes, and also perform some changes Public Key RSA Encryption in C# .NET[^]
i put it in test project, and upload it here:
https://skydrive.live.com/embed?cid=DD24375C87B5BE07&resid=DD24375C87B5BE07%21586&authkey=ABdnCLJ8M3UTcAc[^]
i done both method, using string , which it work also as shown in it''s own article program, the other as a method that i pass to serialize which fail :-/
also since this article method, split and concat the values, so i can say he think about larg data, which Asymmetric key algorithm cant handle...
but i''m wonder why i failed?
i remove base 65''es in out put, and write a small byte[] append-er algorithm , so i directly pass my value to output, but next i face error in decrypter, i dunno how .Net handle this encoding, and i''m looking for rich help from you :|
you can launch the encrypter and see resault,... ''false'' mean run ...
------------------------------------------------------
it''s what i tried second time :
public static byte[] Encrypt(byte[] bytes, int dwKeySize, string xmlString, bool reverse, bool fOAEP)
{
// TODO: Add Proper Exception Handlers
RSACryptoServiceProvider rsaCryptoServiceProvider = new RSACryptoServiceProvider(dwKeySize);
rsaCryptoServiceProvider.FromXmlString(xmlString);
int keySize = dwKeySize / 8;
// The hash function in use by the .NET RSACryptoServiceProvider here is SHA1
// int maxLength = ( keySize ) - 2 - ( 2 * SHA1.Create().ComputeHash( rawBytes ).Length );
int maxLength = keySize - 42;
int dataLength = bytes.Length;
int iterations = dataLength / maxLength;
//StringBuilder stringBuilder = new StringBuilder();
byte[] resault = new byte[0];
for (int i = 0; i <= iterations; i++)
{
byte[] tempBytes = new byte[(dataLength - maxLength * i > maxLength) ? maxLength : dataLength - maxLength * i];
Buffer.BlockCopy(bytes, maxLength * i, tempBytes, 0, tempBytes.Length);
byte[] encryptedBytes = rsaCryptoServiceProvider.Encrypt(tempBytes, fOAEP);
// Be aware the RSACryptoServiceProvider reverses the order of encrypted bytes after encryption and before decryption.
// If you do not require compatibility with Microsoft Cryptographic API (CAPI) and/or other vendors.
// Comment out the next line and the corresponding one in the DecryptString function.
if (reverse) Array.Reverse(encryptedBytes);
// Why convert to base 64?
// Because it is the largest power-of-two base printable using only ASCII characters
//stringBuilder.Append(Convert.ToBase64String(encryptedBytes));
resault = AppendBytes(resault, encryptedBytes);
}
rsaCryptoServiceProvider.Clear();
return resault; //Convert.FromBase64String(stringBuilder.ToString());
}
public static byte[] Decrypt(byte[] EncBytes, int dwKeySize, string xmlString, bool reverse, bool fOAEP)
{
string inputString = Convert.ToBase64String(EncBytes);
// TODO: Add Proper Exception Handlers
RSACryptoServiceProvider rsaCryptoServiceProvider = new RSACryptoServiceProvider(dwKeySize);
rsaCryptoServiceProvider.FromXmlString(xmlString);
int base64BlockSize = ((dwKeySize / 8) % 3 != 0) ? (((dwKeySize / 8) / 3) * 4) + 4 : ((dwKeySize / 8) / 3) * 4;
int iterations = inputString.Length / base64BlockSize;
ArrayList arrayList = new ArrayList();
for (int i = 0; i < iterations; i++)
{
byte[] encryptedBytes = Convert.FromBase64String(inputString.Substring(base64BlockSize * i, base64BlockSize));
// Be aware the RSACryptoServiceProvider reverses the order of encrypted bytes after encryption and before decryption.
// If you do not require compatibility with Microsoft Cryptographic API (CAPI) and/or other vendors.
// Comment out the next line and the corresponding one in the EncryptString function.
if (reverse) Array.Reverse(encryptedBytes);
arrayList.AddRange(rsaCryptoServiceProvider.Decrypt(encryptedBytes, fOAEP));
}
rsaCryptoServiceProvider.Clear();
return arrayList.ToArray(Type.GetType("System.Byte")) as byte[];
}
private static byte[] AppendBytes(byte[] a, byte[] b)
{
int totalLenght = a.Length + b.Length;
byte[] resault = new byte[totalLenght];
int offset = 0;
for (int i = 0; i < a.Length; i++)
{
resault[offset] = a[i];
offset++;
}
for (int i = 0; i < b.Length; i++)
{
resault[offset] = b[i];
offset++;
}
return resault;
}
推荐答案
我写了这个，并试图用它来拆分但仍然会产生错误:-s
i write this, and tried to use this to split but still generate error :-s
private static byte[] SubBytes(byte[] inputBytes, int startIndex, int count)
{
if (startIndex>inputBytes.Length) return new byte[0];
int actualCount = -1;
//Determinate available count
if (inputBytes.Length < startIndex + count)
actualCount = (startIndex + count) - inputBytes.Length;
if (actualCount == -1 || actualCount > count)
actualCount = count;
//Iterate and get resault bytes
byte[] resault = new byte[actualCount];
int rIndex = 0;
for (int i = startIndex; i < startIndex + actualCount; i++)
{
resault[rIndex] = inputBytes[i];
}
}
private static byte[] SubBytes(byte[] inputBytes, int offset, int section, int size)
{
int ActualStartIndex=(section*size)+offset;
return SubBytes(inputBytes, ActualStartIndex, size);
}
首先，我使用128字节拆分器拆分数据，并且工作正常:|
第二个:有人在这里发布，我仍然没有尝试，但是我认为可以回答: ^ ]
first of all, i used 128 byte spliter, to split data, and it worked fine :|
second : some one posted here, i didnt still try it out, but i think that can be answer:http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/a831d26e-e917-431b-ab50-34735f333cd3[^]
这篇关于加密大字符串成功，加密文件失败-RSA的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
