I generated a pair of self-signed priv/pub keys using the following command:
openssl req -x509 -sha256 -nodes -days 36500 -newkey rsa:2048 -keyout signing_logs.key -out signing_logs.crtopenssl x509 -in signing_logs.crt -pubkey -noout > signing_logs.pub
Then I signed a file, e.g.
openssl dgst -sha256 -sign signing_logs.key -out foobar.log.sha256 foobar.log
and able to verify the corresponding signature:
openssl dgst -sha256 -verify signing_logs.pub -signature foobar.log.sha256 foobar.log
What I'd like to accomplish is just a two-step verification, not just using a single command. In other words, first I'd like to decrypt the signature using the pub key to obtain the original alphanumeric sha256 hash, then I want to compare this hash with the one produced by the following command:
openssl dgst -sha256 foobar.log
I already tried the following commands, but I didn't get an alphanumeric hash:
openssl rsautl -inkey signing_logs.pub -pubin -in foobar.log.sha256openssl rsautl -asn1parse -inkey signing_logs.pub -pubin -in foobar.log.sha256
What is the right command?
How many iterations does the scram-sha-256 setting use in PostgreSQL 10?
The docs just say
Setting this parameter to scram-sha-256 will encrypt the password with SCRAM-SHA-256.
The build log reads.
Add SCRAM-SHA-256 support for password negotiation and storage (Michael Paquier, Heikki Linnakangas) This proves better security than the existing md5 negotiation and storage method.
This is a question that has been on my mind for quite some time now. Is it actually possible to split the workload of the SHA-256 between two or more computers which are working in parallel with each other? If so, are there any examples you can show me? Your opinions are welcome. Please tell me if you think such a system would be beneficial or if you think it would be inefficient.
How can I retrieve salt from MySql database using Asp.Net ?
I want to use that retrieved salt to add to the user entered password to generate an SHA256 hash and then authenticate the user.
Here is what I am trying to do to fetch the salt:
String userNameEntered = UserN_TextBox.Text;String passwordEntered = Password_TextBox.Text;String connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();connection = new MySqlConnection(connectionString);connection.Open();MessageBox.Show("Successfully connected to database");String queryString = "select salt from xyz.abc_table where salt = @Salt";command = new MySqlCommand(queryString, connection);command.Parameters.AddWithValue("@Salt", queryString);reader = command.ExecuteReader();Response.Write("Salt retrived is" + reader);reader.Close();connection.Close();
When I execute this code, it returns the MySql Data Reader library rather than the salt in the database....
Thanks in advance... :)
As I know sha2 generate 256 bit hash.
256bit/8 = 32bytes.
So, It should take only varchar(32) field in the database. But I saw an article saying sah2 database field require varchar(64) field in the database. Is that true? Can someone explain, Please!!