pub fn ComputeNonce(aead_id: AEAD, base_nonce: &Nonce, seq: u32) -> Vec<u8> ⓘExpand description
§Compute Nonce
The sequence number provides nonce uniqueness: The nonce used for
each encryption or decryption operation is the result of XORing
base_nonce with the current sequence number, encoded as a big-endian
integer of the same length as base_nonce. Implementations MAY use a
sequence number that is shorter than the nonce length (padding on the left
with zero), but MUST raise an error if the sequence number overflows.
def Context<ROLE>.ComputeNonce(seq):
seq_bytes = I2OSP(seq, Nn)
return xor(self.base_nonce, seq_bytes)