Method and apparatus for authentication of data using different hash functions and feedback

1. A method for outputting digests from a sender to a receiver for data authentication, the method comprising:

inputting, by a processor, data into a first layer of a hashing function for rotation based hashing;

inputting, by the processor, results from the first layer to a second layer of the hashing function for substitution based hashing;

providing, by the processor, feedback from the second layer to the first layer; and

outputting, by the processor, digests, corresponding to the data, directly from the first layer to the receiver and directly from the second layer to the receiver for data authentication.

2. The method of claim 1 , further comprising:

applying fast Fourier transform on the data at the first layer.

3. The method of claim 1 , further comprising:

applying substitution at the second layer on data received from the first layer.

4. The method of claim 1 , further comprising:

changing a length of a digest of the hashing function by reconfiguring the hashing function.

5. The method of claim 4 , wherein the reconfiguring comprises changing a number of digests used by the hashing algorithm.

6. The method of claim 4 , wherein the changing comprises performing switch-case operations to change the length of the digest.

7. The method of claim 4 , wherein the changing comprises increasing the length of the digest.

8. The method of claim 1 , further comprising:

inputting individual words of a message into the first layer of the hashing function and hashing the message as a stream of words.

9. The method of claim 1 , further comprising:

encrypting data by the hashing function.

10. A computer program embodied on a computer readable medium, said computer program configured to control a processor to perform:

inputting data into a first layer of a hashing function for rotation based hashing;

inputting results from the first layer to a second layer of the hashing function for substitution based hashing;

providing feedback from the second layer to the first layer; and

outputting digests, corresponding to the data, directly from the first layer to the receiver and directly from the second layer to the receiver for data authentication.

11. An apparatus, comprising:

data processing means for providing a hashing function, the hashing function being divided into hashing layer means comprising first layer means for rotation based hashing and second layer means for substitution based hashing,

the first layer means comprising first input means for receiving data to be processed, second input means for receiving data from the second layer, first output means for directly outputting digests to a receiver for data authentication, and second output means for communicating data to the second layer, and

the second layer means comprising third input means for receiving data from the first layer, third output means for directly outputting digests, corresponding to the data, to the receiver for data authentication, and fourth output means for communicating data to the first layer.

12. An apparatus, comprising:

a data processing unit configured to perform a hashing function, the hashing function being divided into hashing layers, the data processing unit comprising

a first layer configured to perform rotation based hashing, said first layer comprising a first input configured to receive data to be processed, a second input configured to receive data, a first output configured to directly output digests to a receiver for data authentication, and a second output configured to communicate data, and

a second layer configured to perform substitution based hashing, the second layer comprising a third input configured to receive data from the first layer, a third output configured to directly output digests, corresponding to the data, to the receiver for data authentication, and a fourth output configured to communicate data to the first layer,

wherein the second input of the first layer is configured to receive data from the second layer, and the second output of the first layer is configured to communicate data to the second layer.

13. The apparatus of claim 12 , wherein the first layer is configured to apply fast fourier transform on the data.

14. The apparatus of claim 12 , wherein the second layer is configured to apply substitution on data received from the first layer.

15. The apparatus of claim 12 , wherein the data processing unit is configured to change a length of the digest of the hashing function by reconfiguring the hashing function.

16. The apparatus of claim 15 , wherein the reconfiguration comprises changing a number of digests used by the hashing algorithm.

17. The apparatus of claim 15 , wherein switch-case operations are used when changing the length of the digest.

18. The apparatus of claim 15 , wherein the length of the digest is increased.

19. The apparatus of claim 12 , wherein the first layer is configured to receive individual words of a message and to hash the message as a stream of words.

20. The apparatus of claim 12 , wherein the data processing unit is configured to encrypt data by the hashing function.