Snowflake DB Key-Pair Implementation Issue in C#

Question

I am working on Snowflake Database Key-Pair implementation (migrating from user_id & password to Key-Pair) in .net Framework 4.8. I have installed Snowflake data connector version 4.0. I have encrypted private key and its passphrase. When I am trying to implement the connection using private key and its passphrase, I am getting

Snowflake.Data.Client.SnowflakeDbException: 'Error: Could not read private key with value passed in connection string. \n Error : incorrect private key value or private key format: use "\n" for newlines and double the equals sign.

I don't have (=) sign in private key.

I also implemented

string privateKeyContent = File.ReadAllText("path_to_private_key_file").Replace("\\n", "\\n").Replace("=", "==");

to avoid any human mistakes but still getting the error.

Here is the dummy code i am trying to connect to Snowflake Database.

static void Main(string[] args) 
{
 string keyText = File.ReadAllText(@"C:\CARAT\Snowflake_program\Private_key.txt").Replace("\n", "\\n").Replace("=", "=="); 
 string keyPwd = Environment.GetEnvironmentVariable(<My_Passpharse>);
 SnowflakeDbConnectionStringBuilder connStringBuilder = new SnowflakeDbConnectionStringBuilder()
 {
 ["ACCOUNT"] = "<MY ACCOUNT_NAME>",
 ["DB"] = "<MY DB_NAME>",
 ["SCHEMA"] = "<MY SCEHMA_NAME>",
 ["USER"] = "<MY USER_NAME>",
 ["ROLE"] = "<MY ROLE_NAME>",
 ["WAREHOUSE"] = "<MY WH_NAME>",
 ["AUTHENTICATOR"] = "SNOWFLAKE_JWT",
 ["PRIVATE_KEY"] = keyText,
 ["PRIVATE_KEY_PWD"] = keyPwd,
 };
 SnowflakeDbConnection conn = new SnowflakeDbConnection();
 conn.ConnectionString = connStringBuilder.ConnectionString;
 conn.Open();
 Console.WriteLine("Connection successful!");
} 

While Opening the connection getting unable to read private key error.

• Dai: .Replace("\\n", "\\n") <-- This won't do anything useful, is this a typo?
• President James K. Polk: I don't understand why the error message suggests ...and double the equals sign..., that doesn't really make any sense. Base64 encoders either don't do any padding at all or they pad with the correct number of equal signs ('=').
• Swapnil Shopping: yes exactly. Now i am passing the encrypted private key via bouncy castle library which decrypts the private key using passphrase and providing that private key in the SF connection string as parameter. still getting the above error while trying to open the connection. Getting error "PemException: problem creating ENCRYPTED private key: System.NullReferenceException: Object reference not set to an instance of an object. at Org.BouncyCastle.OpenSsl.PemReader.ReadPrivateKey(PemObject pemObject)" Dotnet framework - 4.8 Snowflake data connector - 4.0/4.2