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Is there a built-in sha256 function in SQL Server? I can't find a sha256 T-SQL function source code either. Anyone who has an alternative?
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Since it produces only 2256 numbers simply if you try more than so many inputs that produce a different result you will certainly get the same SHA256. This makes it non unique. If it were truly unique you would be able to reverse it even by trial and error. This would make it a compression algorithm.
SHA-2 is the 2nd version of the SHA hash generator algorithm. It is otherwise called Secure Hash Algorithm 2. SHA-2 is a set of 6 hashing algorithms (SHA-256, SHA-512, SHA-224, SHA-384, SHA-512/224, SHA-512/256). SQL Server from version 2016 to 2019 supports SHA2 256 and SHA2 512.
SHA256 is a hashing function, not an encryption function. Secondly, since SHA256 is not an encryption function, it cannot be decrypted. What you mean is probably reversing it. In that case, SHA256 cannot be reversed because it's a one-way function.
A hash is a number that is generated by reading the contents of a document or message. Different messages should generate different hash values, but the same message causes the algorithm to generate the same hash value. SQL Server has a built-in function called HashBytes to support data hashing.
SQL Server 2012 supports SHA2_256 and SHA2_512.
SELECT HASHBYTES('SHA2_256','something')
I think you are looking for HASHBYTES, but it supports only up to SHA-1 (160 bytes)
FYI Hashing is not encrypting. It is irreversible. Encryption is a process that is reversible to get the original data.
Reference for SHA2
SHA-2 is a set of cryptographic hash functions (SHA-224, SHA-256, SHA-384, SHA-512)
As for 256-byte hashing function - there isn't one built in.
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