generate digital signature of Images

hash of images

Calculates the Digital Signature of a true-color image,
Using the SHA algorithm

%function [digest, MSG_PADDED] = image_hash(V_LEN,H_LEN,METH,IMG_FILE)
%Generates IMAGE Digest or HASH using algorithms : SHA1, SHA-224, SHA256
%Uses matlab program "hash.m" developed by Kshitish
%
%H_LEN :: Enter No. of PIXEL Lines in the Image should be GT 0
%V_LEN :: Enter No. of PIXELs per Line in the Image should be GT 0
%METH :: SHA160, SHA224,SHA256,SHA384,SHA512
%IMAGE_FILE :: (only) True-color image file (in single quotes')
%
% -- Verfied variables (a, b,c,d,e) over 80 rounds against
% FIPS-180-2 examaples
% -- I dont Guarantee, if threatened by
% BIT Resolution/overflow/underflow
%
% -- Kshitish says GoodBye ...
%
% end