law xchacha20.valid

bend-collections-laws-crypto@1.0.0.0 · proofs/crypto/chacha/laws.bend:98

import Base
import bend-collections-laws-crypto@1.0.0.0/src/crypto/chacha/chacha20.bend as I
import bend-collections-laws-crypto@1.0.0.0/spec/crypto/chacha.bend as R

98law xchacha20.valid:
99  for +key: List<&2, U32>
100  for +counter: U32
101  for +nonce: List<&2, U32>
102  for +plaintext: List<&2, U32>
103  for +hk: {List.length(&2, U32, key) == 32n : Nat}
104  for +hn: {List.length(&2, U32, nonce) == 24n : Nat}
105  {I.xchacha20(key, counter, nonce, plaintext) == Some{R.xencrypt(key, counter, nonce, plaintext)} : Maybe<&2, List<&2, U32>>}