Can anyone explain how to make the sha code work for any other input text other than the default one which is "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu"

I am getting the correct digest for this input alone.

If I change the input to "abc" and the Padding bits(1bit with 1, 871 bits as 0's and 128 bit representation of the length 24) accordingly. I dont get the correct digest.

Someone throw some light on this issue