c#,js, RSA加密签名常用方法汇总；

1，c# .net framework RSA 加密签名；  

// privatekey 私钥字符串

  byte[] keyData = Convert.FromBase64String(privatekey);
  using (CngKey cngKey = CngKey.Import(keyData, CngKeyBlobFormat.Pkcs8PrivateBlob))
  using (RSACng rsa = new RSACng(cngKey))
  {
    byte[] data = System.Text.Encoding.UTF8.GetBytes(message);
    return Convert.ToBase64String(rsa.SignData(data, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1));
  }

2，c# .net 5 RSA 加密签名；

//跨平台可用; 

// privatekey 私钥字符串
byte[] keyData = Convert.FromBase64String(privatekey);
int len = keyData.Length;
var r = System.Security.Cryptography.RSA.Create();
r.ImportPkcs8PrivateKey(keyData, out len);
//message 待加密字符串
byte[] data = System.Text.Encoding.UTF8.GetBytes(message);
r.SignData(data, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);

3，js RSA 加密签名；