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C# RSA加解密和MD5加密
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互联网集市收集整理的这篇技术教程文章主要介绍了C# RSA加解密和MD5加密，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含5145字，纯文字阅读大概需要8分钟。
内容图文
1.RSA加密
///
<summary>
///
加密处理
///
</summary>
///
<param name="content"></param>
///
<param name="publicKeyPem"></param>
///
<param name="charset"></param>
///
<returns></returns>
public
static
string RSAEncrypt(string content, string publicKeyPem, string charset = "UTF-8")
{
try
{
string sPublicKeyPEM = File.ReadAllText(publicKeyPem);
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.PersistKeyInCsp = false;
RSACryptoServiceProviderExtension.LoadPublicKeyPEM(rsa, sPublicKeyPEM);
byte[] data = Encoding.GetEncoding(charset).GetBytes(content);
int maxBlockSize = rsa.KeySize / 8 - 11; //加密块最大长度限制if (data.Length <= maxBlockSize)
{
byte[] cipherbytes = rsa.Encrypt(data, false);
return Convert.ToBase64String(cipherbytes);
}
MemoryStream plaiStream = new MemoryStream(data);
MemoryStream crypStream = new MemoryStream();
Byte[] buffer = new Byte[maxBlockSize];
int blockSize = plaiStream.Read(buffer, 0, maxBlockSize);
while (blockSize > 0)
{
Byte[] toEncrypt = new Byte[blockSize];
Array.Copy(buffer, 0, toEncrypt, 0, blockSize);
Byte[] cryptograph = rsa.Encrypt(toEncrypt, false);
crypStream.Write(cryptograph, 0, cryptograph.Length);
blockSize = plaiStream.Read(buffer, 0, maxBlockSize);
}
return Convert.ToBase64String(crypStream.ToArray(), Base64FormattingOptions.None);
}
catch (Exception e)
{
e.Error();
returnnull;
}
}
2.RSA解密
public
static
string RSADecrypt(string content, string privateKeyPem, string charset = "UTF-8")
{
try
{
RSACryptoServiceProvider rsaCsp = LoadCertificateFile(privateKeyPem);
if (string.IsNullOrEmpty(charset))
{
charset = "UTF-8";
}
byte[] data = Convert.FromBase64String(content);
int maxBlockSize = rsaCsp.KeySize / 8; //解密块最大长度限制if (data.Length <= maxBlockSize)
{
byte[] cipherbytes = rsaCsp.Decrypt(data, false);
return Encoding.GetEncoding(charset).GetString(cipherbytes);
}
MemoryStream crypStream = new MemoryStream(data);
MemoryStream plaiStream = new MemoryStream();
Byte[] buffer = new Byte[maxBlockSize];
int blockSize = crypStream.Read(buffer, 0, maxBlockSize);
while (blockSize > 0)
{
Byte[] toDecrypt = new Byte[blockSize];
Array.Copy(buffer, 0, toDecrypt, 0, blockSize);
Byte[] cryptograph = rsaCsp.Decrypt(toDecrypt, false);
plaiStream.Write(cryptograph, 0, cryptograph.Length);
blockSize = crypStream.Read(buffer, 0, maxBlockSize);
}
return Encoding.GetEncoding(charset).GetString(plaiStream.ToArray());
}
catch
{
//e.Error();returnnull;
}
}
3.RSA签名
///
<summary>
///
RSA签名
///
</summary>
///
<param name="data"></param>
///
<param name="privateKeyPem"></param>
///
<param name="charset"></param>
///
<returns></returns>
public
static
string RSASign(string data, string privateKeyPem, string charset)
{
RSACryptoServiceProvider rsaCsp = LoadCertificateFile(privateKeyPem);
byte[] dataBytes = null;
if (string.IsNullOrEmpty(charset))
{
dataBytes = Encoding.UTF8.GetBytes(data);
}
else
{
dataBytes = Encoding.GetEncoding(charset).GetBytes(data);
}
byte[] signatureBytes = rsaCsp.SignData(dataBytes, "SHA1");
return Convert.ToBase64String(signatureBytes);
}
```
```
privatestatic RSACryptoServiceProvider LoadCertificateFile(string privateKeyPem)
{
using (System.IO.FileStream fs = System.IO.File.OpenRead(privateKeyPem))
{
byte[] data = newbyte[fs.Length];
string res = string.Empty;
fs.Read(data, 0, data.Length);
if (data[0] != 0x30)
{
res = GetPem("RSA PRIVATE KEY", data);
}
try
{
RSACryptoServiceProvider rsa = DecodePemPrivateKey(res);
return rsa;
}
catch (Exception e)
{
e.Error();
returnnull;
}
}
}
```
RSA签名验签
```
publicstaticbool RSACheckContent(string signContent, string sign, string publicKeyPem, string charset)
{
try
{
string sPublicKeyPEM = File.ReadAllText(publicKeyPem);
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.PersistKeyInCsp = false;
RSACryptoServiceProviderExtension.LoadPublicKeyPEM(rsa, sPublicKeyPEM);
SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();
if (string.IsNullOrEmpty(charset))
{
charset = DEFAULT_CHARSET;
}
bool bVerifyResultOriginal = rsa.VerifyData(Encoding.GetEncoding(charset).GetBytes(signContent), sha1, Convert.FromBase64String(sign));
return bVerifyResultOriginal;
}
catch(Exception e)
{
e.Error();
returnfalse;
}
}
4.MD5加密
///
<summary>
///
MD5加密算法
///
</summary>
///
<param name="str"></param>
///
<returns></returns>
public
static
string MD5(String str, string encoder = "UTF8")
{
byte[] result = null;
byte[] inputbyt = null;
switch (encoder)
{
case"UTF8":
inputbyt = Encoding.UTF8.GetBytes(str);
break;
case"GBK":
inputbyt = Encoding.GetEncoding("GBK").GetBytes(str);
break;
default:
inputbyt = Encoding.GetEncoding("GB2312").GetBytes(str);
break;
}
result = ((HashAlgorithm)CryptoConfig.CreateFromName("MD5")).ComputeHash(inputbyt);
StringBuilder output = new StringBuilder(16);
for (int i = 0; i < result.Length; i++)
{
output.Append((result[i]).ToString("x2", System.Globalization.CultureInfo.InvariantCulture));
}
return output.ToString();
}
原文：https://www.cnblogs.com/xiaoerduo/p/10327993.html
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