How does SHA- 256 algorithm works?

A Step by step detailed explanation of SHA-256 algorithm with example.

Step 1: Pre Processing:

Exercise for you:

How many bits you will pad for input message length of 2348 bits?

Solution:

Step 2: Initialize Hash Values (a, b, c, d, e, f)

Step 3: Initialize round constants K. (K0.. K63)

Step 4: Chunk Loop (0 .. 63)

Step 5: Create message schedule(W):

Step 6: Compression

Step 7: Modify final values

Step 8: Concatenate final hash