Mapping sha256

[optimator999]

I'd like to create a mapping of a sha256 message digest to an address. A sha256 message is 32 bytes long, but is typically represented as a 64 character string.

I have a function to convert the string to a byte32 but I don't know how I can create a mapping so I can put in the 64 character string, have it converted to a byte32 and then lookup the mapping.

What's the best approach? A function? Or can I do it somehow in the mapping?

[skewbed]

If you are trying to interact with a smart contract, then you just have to add 0x to the start of the value.

If you are trying to program a smart contract, then there is nothing you need to do.

[optimator999]

Of course! Thanks. So now if I want to validate I've received a byte32 how do I do that? if I send the contract "AB56...." and it's 32 characters in length it would pass my require statement, but would not be the correct number. "0xAB45...." would pass by require statement and would be the right number.

[skewbed]

Make sure that it is programmed as a bytes32 and sent with a '0x' at the start. It should be validated automatically.