SHA-256 is a cryptographic (one-way) hash function, so there is no direct way to decode it. The entire purpose of a cryptographic hash function is that you can't undo it.

Hashing is a one way function (well, a mapping). It's irreversible, you apply the secure hash algorithm and you cannot get the original string back. The most you can do is to generate what's called “a collision”, that is, finding a different string that provides the same hash. Cryptographically secure hash algorithms are designed to prevent the occurrence of collisions. You can attack a secure hash by the use of a rainbow table, which you can counteract by applying a salt to the hash before storing it.

Encrypting is a proper (two way) function. It's reversible, you can decrypt the mangled string to get original string if you have the key.

Puede servir para guardar una password encriptada en b.d.

echo clave |sha256sum

a4011bda24f2f35c835acd50acafba77329b373df71d716a1a5c2f067e6a8e35  -