Update readme with installation instructions

README.md

@@ -1,3 +1,73 @@
-# sql_hashers
+# SQL Hashers
 
-MS SQL CLR implementation of Argon2id hasher for secure password hashing in database
+A collection of new and secure hashing algorithms for Microsoft SQL Servers using CLR to bring Microsoft SQL into the 21st century.
+
+# Features
+
+
+### Hashing Algorithms:
+
+* **Argon2id** (with salt and verification)
+
+# Installation
+
+Build yourself or grab the combined dll from releases.
+Copy it to a path on the server with a running MS SQL.
+
+Run following SQL Script:
+
+```sql
+DROP PROCEDURE IF EXISTS argon2id_hash;
+GO
+
+DROP PROCEDURE IF EXISTS argon2id_hash_custom;
+GO
+
+DROP PROCEDURE IF EXISTS argon2id_verify;
+GO
+
+DROP ASSEMBLY IF EXISTS clr_hashers;
+GO
+
+ALTER DATABASE [your_database_name_here] SET TRUSTWORTHY ON;
+go
+
+CREATE ASSEMBLY clr_hashers from 'C:\clr\MsSQL2019_hashers.dll' WITH PERMISSION_SET = unsafe;
+GO
+
+-- Taken from https://sqlquantumleap.com/2017/09/29/sqlclr-vs-sql-server-2017-part-6-trusted-assemblies-cant-do-module-signing/
+DECLARE @Hash BINARY(64),
+        @ClrName NVARCHAR(4000),
+        @AssemblySize INT,
+        @MvID UNIQUEIDENTIFIER;
+
+SELECT  @Hash = HASHBYTES(N'SHA2_512', af.[content]),
+        @ClrName = CONVERT(NVARCHAR(4000), ASSEMBLYPROPERTY(af.[name],
+                N'CLRName')),
+        @AssemblySize = DATALENGTH(af.[content]),
+        @MvID = CONVERT(UNIQUEIDENTIFIER, ASSEMBLYPROPERTY(af.[name], N'MvID'))
+FROM    sys.assembly_files af
+  JOIN  sys.assemblies a ON (af.assembly_id = a.assembly_id)
+WHERE   a.name = 'clr_hashers'
+AND     af.[file_id] = 1;
+
+SELECT  @ClrName, @AssemblySize, @MvID, @Hash;
+
+EXEC sys.sp_add_trusted_assembly @Hash, @ClrName;
+GO
+
+ALTER DATABASE [your_database_name_here] SET TRUSTWORTHY OFF;
+go
+
+CREATE PROCEDURE argon2id_hash(@password NVARCHAR (256), @hash NVARCHAR (256) OUTPUT)
+  AS EXTERNAL NAME clr_hashers.SqlHashers.Argon2id_hash;
+GO
+
+CREATE PROCEDURE argon2id_hash_custom(@password NVARCHAR (256), @parallel SMALLINT, @memory SMALLINT, @iterations SMALLINT, @bc SMALLINT, @output NVARCHAR (256) OUTPUT)
+  AS EXTERNAL NAME clr_hashers.SqlHashers.Argon2id_hash_custom;
+GO
+
+CREATE PROCEDURE argon2id_verify(@i NVARCHAR (256), @h NVARCHAR (256))
+  AS EXTERNAL NAME clr_hashers.SqlHashers.Argon2id_verify;
+GO
+```