public static string sign(string content, string privateKey)
{
try
{
PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(Convert.FromBase64String(privateKey));
//Base64.decode(privateKey));
KeyFactory keyf = KeyFactory.GetInstance(ALGORITHM, "BC");
IPrivateKey priKey = keyf.GeneratePrivate(priPKCS8);
Signature signature = Signature.GetInstance(SIGN_ALGORITHMS);
signature.InitSign(priKey);
signature.Update(Encoding.Default.GetBytes(content));
byte[] signed = signature.Sign();
return Convert.ToBase64String(signed);
}
catch (Exception e)
{
string mesg = e.StackTrace;
}
return null;
}
private string GetSha256(string key, string data)
{
string trimmedKey = key.Replace("-----\\w+ PRIVATE KEY-----", "").Replace("\\s", "");
try
{
byte[] result = Android.Util.Base64.Decode(trimmedKey, Android.Util.Base64Flags.Default);
var str = new Java.Lang.String(data);
var factory = Java.Security.KeyFactory.GetInstance("RSA");
Java.Security.Spec.EncodedKeySpec keySpec = new Java.Security.Spec.PKCS8EncodedKeySpec(result);
var signature = Java.Security.Signature.GetInstance("SHA256withRSA");
var s = factory.GeneratePrivate(keySpec);
signature.InitSign(s);
signature.Update(str.GetBytes());
byte[] encrypted = signature.Sign();
return(Android.Util.Base64.EncodeToString(encrypted, Android.Util.Base64Flags.NoWrap));
}
catch (Exception e)
{
}
return(null);
}