VHDL Code for IDEA Algorithm

[pramod0488]

Hi all ...



Does anyone knows how to implement IDEA algorithm in VHDL, especially the multiplier part(Low High Algorithm)?



Kindly help me out in this

 

[FvM]

As the algorithm is published in the form of C code, you should be able to derive a VHDL implementation.

 

[pramod0488]

Can you please give me the link, at which i can find the C code implementation of this ?

 

[FvM]

The link is here Idea NXT - Wikipedia, the free encyclopedia

 

[pramod0488]

i am not able to understand how the MOdulo 2 multiplier is implemented, can you please give me a sample code for doing the modulo multiplier thing ?

 

[FvM]

I see, that I confused IDEA (International Data Encryption Algorithm) and it's successor IDEA NXT. Both are similar in several regards of course. Modular arithmetic can be found in most newer crypto algorithms. The principle is explained in crypto related and general mathematical literature.

IDEA doesn't use modulo 2 rather than modulo 2^16+1 (0x10001) multiplication, if I understand right. The IDEA code is e.g documented in Bruce Schreier's profound text book Applied Cryptography.

 

[tariq786]

modulo arithmetic means after you do the add or multiply, you have to take the remainder. For example

6*5 mod 13
= 30 mod 13
= 4

hope it helps a bit

 

[fdamtew]

Can you please give me the link, at which i can find the VHDL code implementation of IDEA ?