Modular reduction

[paramdhingra]

Hi I am doing my masters project on montgomery algorithm.
I am implementing it for large decimal numbers, more than 30 digits( more than 80-bit data). I have to implement it in Turbo C. I have tried using double as the data type, it works fine till 20 decimal disgits. can anybody suggest me how to extend this beyond 20 decimal digits.

thanks
Param

[weaknessforcats]

You will need to write a large number type. Maybe a struct with arrays that are managed at the bit level by an API.

Is there a reason you can't use any of the already written big number libraries?

[paramdhingra]

You will need to write a large number type. Maybe a struct with arrays that are managed at the bit level by an API.

Is there a reason you can't use any of the already written big number libraries?

Thanks for the reply. I want a big number library compatible with Turbo C. I have tried using MIRACL, MAPM, GMP. May be i have not understood them properly. can u suggest some proper source for downloading such libraries.