Need all Combinations of 10 Digit String and More

Hello, I am looking for a project that first entails gathering all possible combinations of a 10 digit string. The string will consist of numbers 0-9, Capitalized Letters from A-Z and lower case letters from a-z That is 62 characters in all. I realize this is quite large, so I am open to ideas of how to best manage the data. Once this is complete I will want each of the variables given a SHA256 decryption. For example check here: [login to view URL] Enter in 0123456789 It will give you this as a result 84D89877F0D4041EFB6BF91A16F0248F2FD573E6AF05C19F96BEDB9F882F7882 So I would like it stored so that 0123456789 = 84D89877F0D4041EFB6BF91A16F0248F2FD573E6AF05C19F96BEDB9F882F7882 I will need to give a slight alteration to this step above, but it is not important now since it doesnt really affect anything. Lastly, I will need access to this database or set of databases so that I can search for the 10 digit variables searching by the long string. So I will need a way to go to a website/URL and be able to enter in a long string and have it tell me if it already exists or not Looking for this right away. Thank you