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RSA encrypt only on MSP430

Hello,

We have a need to implement a PKI scheme in our embedded system which uses a MSP430 controller. Ideally we want to use RSA with 512 or 1024 bit keys. The public key will be in the flash, we need only encryption with the public key of a 256 bit block.

Couple of questions.

1. Is this even possible on a MSP430 with 4K SRAM and 32K Flash ?

2. Any pointers where I can find implementations of this in C (have looked at polarssl and openssl, don't think they were written with embedded systems in view) A search on the TI forums also drew a blank

3. If RSA is a impossibility any pointers for a PKI scheme that is implementable on a 430 based system ?

Thanks in advance.

Best,
Rama
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