Struct RsaModularExponentiation

pub struct RsaModularExponentiation<'a, 'd, T: RsaMode, Dm: DriverMode> { /* private fields */ }

Available on crate feature unstable only.

Support for RSA peripheral’s modular exponentiation feature that could be used to find the (base ^ exponent) mod modulus.

Each operand is a little endian byte array of the same size

Implementations

impl<T, const N: usize> RsaModularExponentiation<'_, '_, T, Async>

where T: RsaMode<InputType = [u32; N]> + RsaMode,

pub async fn exponentiation( &mut self, base: &T::InputType, r: &T::InputType, outbuf: &mut T::InputType, )

Asynchronously performs an RSA modular exponentiation operation.

impl<'a, 'd, T, Dm: DriverMode, const N: usize> RsaModularExponentiation<'a, 'd, T, Dm>

where T: RsaMode<InputType = [u32; N]> + RsaMode,

pub fn new( rsa: &'a mut Rsa<'d, Dm>, exponent: &T::InputType, modulus: &T::InputType, m_prime: u32, ) -> Self

Creates an instance of RsaModularExponentiation.

m_prime could be calculated using -(modular multiplicative inverse of modulus) mod 2^32.

For more information refer to 24.3.2 of https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf.

pub fn start_exponentiation(&mut self, base: &T::InputType, r: &T::InputType)

Starts the modular exponentiation operation.

r can be calculated using 2 ^ ( bitlength * 2 ) mod modulus.

For more information refer to 24.3.2 of https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf.

pub fn read_results(&mut self, outbuf: &mut T::InputType)

Reads the result to the given buffer.

This is a non blocking function that returns without an error if operation is completed successfully. start_exponentiation must be called before calling this function.