/// <summary>
/// 检查是否是有效的RSA签名，验证签名有效性
/// </summary>
/// <param name="strPublicKey">公钥</param>
/// <param name="strHash">HASH描述</param>
/// <param name="strSignedString">签名后的结果</param>
/// <returns>是否验证通过</returns>
public static bool IsValidRSASign(string strRSAPublicKey, string strHash, string strSignedString)
{
try
{
byte[] DeformatterData;
byte[] HashbyteDeformatter;
HashbyteDeformatter = Convert.FromBase64String(strHash);
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
if (FKStringHelper.IsValidationXMLFormat(strRSAPublicKey))
{
rsa.FromXmlString(strRSAPublicKey);
}
else
{
string strXML = FKRSAEncrypt.ConvertRSAPublicKey_Java2DotNet(strRSAPublicKey);
if (string.IsNullOrEmpty(strXML))
{
return(false);
}
rsa.FromXmlString(strXML);
}
RSAPKCS1SignatureDeformatter rsaDeformatter = new RSAPKCS1SignatureDeformatter(rsa);
rsaDeformatter.SetHashAlgorithm("MD5");
DeformatterData = Convert.FromBase64String(strSignedString);
return(rsaDeformatter.VerifySignature(HashbyteDeformatter, DeformatterData));
}
catch (Exception e)
{
Console.WriteLine($"[Error] RSA signature failed. Error = {e.ToString()}");
return(false);
}
}
/// <summary>
/// RSA签名
/// </summary>
/// <param name="strRSAPrivateKey">私钥</param>
/// <param name="strHash"></param>
/// <returns>签名后数据</returns>
public static string RSASign(string strRSAPrivateKey, string strHash)
{
string strSignatureRet = string.Empty;
try
{
byte[] HashbyteSignature;
byte[] EncryptedSignatureData;
HashbyteSignature = Convert.FromBase64String(strHash);
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
if (FKStringHelper.IsValidationXMLFormat(strRSAPrivateKey))
{
rsa.FromXmlString(strRSAPrivateKey);
}
else
{
string strXML = FKRSAEncrypt.ConvertRSAPrivateKey_Java2DotNet(strRSAPrivateKey);
if (string.IsNullOrEmpty(strXML))
{
return(string.Empty);
}
rsa.FromXmlString(strXML);
}
RSAPKCS1SignatureFormatter rsaFormatter = new RSAPKCS1SignatureFormatter(rsa);
rsaFormatter.SetHashAlgorithm("MD5");
EncryptedSignatureData = rsaFormatter.CreateSignature(HashbyteSignature);
strSignatureRet = Convert.ToBase64String(EncryptedSignatureData);
return(strSignatureRet);
}
catch (Exception e)
{
Console.WriteLine($"[Error] RSA signature failed. Error = {e.ToString()}");
return(string.Empty);
}
}
