Struct HmacDrbg 

pub struct HmacDrbg<H: Digest> { /* private fields */ }

HMAC_DRBG internal state (SP 800-90A §10.1.2.1): (K, V) each outlen octets, plus the reseed_counter. K and V are secret.

Implementations

impl<H: Digest> HmacDrbg<H>

pub fn instantiate( entropy_input: &[u8], nonce: &[u8], personalization: &[u8], ) -> Result<Self, Error>

Instantiate an HMAC_DRBG (SP 800-90A §10.1.2.3).

  seed_material = entropy_input || nonce || personalization_string
  K = 0x00 00 … 00   (outlen octets)
  V = 0x01 01 … 01   (outlen octets)
  (K, V) = Update(seed_material, K, V)
  reseed_counter = 1

pub fn reseed( &mut self, entropy_input: &[u8], additional_input: &[u8], ) -> Result<(), Error>

Reseed an HMAC_DRBG (SP 800-90A §10.1.2.4).

  seed_material = entropy_input || additional_input
  (K, V) = Update(seed_material, K, V)
  reseed_counter = 1

pub fn generate( &mut self, out: &mut [u8], additional_input: &[u8], ) -> Result<(), Error>

Generate pseudorandom bits (SP 800-90A §10.1.2.5).

  if reseed_counter > reseed_interval: return "Reseed required"
  if additional_input != Null: (K, V) = Update(additional_input, K, V)
  temp = ""
  while len(temp) < requested_bits:
      V = HMAC(K, V); temp = temp || V
  returned_bits = leftmost requested_bits of temp
  (K, V) = Update(additional_input, K, V)
  reseed_counter += 1