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FIT CTU - ECC test firmware

x25519 rfc : https://www.rfc-editor.org/rfc/rfc7748

Inputs:

  • 0x0000 : coordinate u, 32-byte string
  • 0x0020 : scalar k, 32-byte string
  • 0x0040 : mask for euclidean scalar blinding, 256-bit unsigned integer
  • 0x0060 : mask for z-coordinate randomization, 256-bit unsigned integer

Outputs:

  • 0x1000 : X25519(k, u), 32-byte string

Constants:

Preload data_ram_in_const.hex from address 0x0200.