how read hash values from hash table/index in MATLAB?

suppose my hash value is

H=15EAE46F
  DA1D7G5N
  E4GFH2TD
  G52GHSJK
  8F5VF23D

i have find above hash value using SHA-512 algorithm. To take text file as a input and a hash key to generate this hash vlue/MD value afterward i have a task to identify the R,G,B component and replace this R,G,B component to text file component?...plese suggest me...i m doing these thing on MATLAB.

[Jan]

All necessry details are missing here. Please edit the question and insert more information.

[Walter Roberson]

Are you using containers.map ?

[SAURABH]

NO,HOW I CAN USE THIS.

[Walter Roberson]

http://www.mathworks.com/help/matlab/map-containers.html

However, looking now, it looks to me as if its strategy is hidden, and that there is no obvious user access to hash keys.

My question was posed before you added your details, and does not appear to be appropriate for your revised question.

[Walter Roberson]

Do you have the SHA-512 code already, or are you asking for that as part of your question?

What do you have to identify the R, G, B components of ? If it is an RGB image you are working with, then wouldn't replacing R, G, B components with text show up fairly strongly in the image?

Are you sure you aren't doing steganography? Is what you are working on a need to hide the bits of the text file, along with the SHA-512 hash of the file, imperceptibly in an image, and then to have another program to extract bits from the image, check that the SHA-512 still matches, and if it does, display the hidden message ?