/// <summary>
/// 公钥验签
/// </summary>
/// <param name="str">待验证的字符串</param>
/// <param name="sign">加签之后的字符串</param>
/// <param name="publicKey">公钥</param>
/// <param name="signAlgType">hash算法</param>
/// <returns>签名是否符合</returns>
public static bool Verify(string str, string sign, string publicKey, SignAlgType signAlgType)
{
byte[] bt = Encoding.UTF8.GetBytes(str);
byte[] rgbHash = null;
switch (signAlgType)
{
case SignAlgType.SHA1:
{
var csp = SHA1.Create();
rgbHash = csp.ComputeHash(bt);
}
break;
case SignAlgType.SHA256:
{
var csp = SHA256.Create();
rgbHash = csp.ComputeHash(bt);
}
break;
case SignAlgType.MD5:
{
var csp = MD5.Create();
rgbHash = csp.ComputeHash(bt);
}
break;
default:
break;
}
RSACryptoServiceProvider key = new RSACryptoServiceProvider();
RSAHelper rs = new RSAHelper(RSAType.RSA, Encoding.UTF8, "", publicKey);
var xml = rs._publicKeyRsaProvider.ToXmlString(false);
key.FromXmlString(xml);
RSAPKCS1SignatureDeformatter deformatter = new RSAPKCS1SignatureDeformatter(key);
deformatter.SetHashAlgorithm(signAlgType.ToString());
byte[] rgbSignature = Convert.FromBase64String(sign);
if (deformatter.VerifySignature(rgbHash, rgbSignature))
{
return(true);
}
return(false);
}
/// <summary>
/// 私钥签名
/// </summary>
/// <param name="str">需签名的数据</param>
/// <param name="privateKey">私钥</param>
/// <param name="signAlgType">hash算法</param>
/// <returns>签名后的值</returns>
public static string Sign(string str, string privateKey, SignAlgType signAlgType)
{
//根据需要加签时的哈希算法转化成对应的hash字符节
byte[] bt = Encoding.UTF8.GetBytes(str);
byte[] rgbHash = null;
switch (signAlgType)
{
case SignAlgType.SHA1:
{
var csp = SHA1.Create();
rgbHash = csp.ComputeHash(bt);
}
break;
case SignAlgType.SHA256:
{
var csp = SHA256.Create();
rgbHash = csp.ComputeHash(bt);
}
break;
case SignAlgType.MD5:
{
var csp = MD5.Create();
rgbHash = csp.ComputeHash(bt);
}
break;
default:
break;
}
RSACryptoServiceProvider key = new RSACryptoServiceProvider();
RSAHelper rs = new RSAHelper(RSAType.RSA, Encoding.UTF8, privateKey);
var xml = rs._privateKeyRsaProvider.ToXmlString(true);
key.FromXmlString(xml);
RSAPKCS1SignatureFormatter formatter = new RSAPKCS1SignatureFormatter(key);
formatter.SetHashAlgorithm(signAlgType.ToString());//此处是你需要加签的hash算法，需要和上边你计算的hash值的算法一致，不然会报错。
byte[] inArray = formatter.CreateSignature(rgbHash);
return(Convert.ToBase64String(inArray));
}
