law Api256.forgery

bend-collections-laws-crypto@1.0.0.0 · proofs/crypto/aes/laws.bend:379

import Base
import bend-collections-laws-crypto@1.0.0.0/src/crypto/aesgcm.bend as GCM
import bend-collections-laws-crypto@1.0.0.0/spec/crypto/aes/gcm.bend as G

379# A wrong tag gives None.
380law Api256.forgery:
381  for +key: List<&2, U32>
382  for +h: {List.length(&2, U32, key) == 32n : Nat}
383  for +n0: U32
384  for +n1: U32
385  for +n2: U32
386  for +n3: U32
387  for +n4: U32
388  for +n5: U32
389  for +n6: U32
390  for +n7: U32
391  for +n8: U32
392  for +n9: U32
393  for +n10: U32
394  for +n11: U32
395  for +aad: List<&2, U32>
396  for +c: List<&2, U32>
397  for +t0: U32
398  for +t1: U32
399  for +t2: U32
400  for +t3: U32
401  for +t4: U32
402  for +t5: U32
403  for +t6: U32
404  for +t7: U32
405  for +t8: U32
406  for +t9: U32
407  for +t10: U32
408  for +t11: U32
409  for +t12: U32
410  for +t13: U32
411  for +t14: U32
412  for +t15: U32
413  for ne: {[t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12, t13, t14, t15] != G.aes_tag(key, [n0, n1, n2, n3, n4, n5, n6, n7, n8, n9, n10, n11], aad, c) : List<&2, U32>}
414  {GCM.aes256_gcm_decrypt(key, [n0, n1, n2, n3, n4, n5, n6, n7, n8, n9, n10, n11], aad, List.append(&2, U32, c, [t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12, t13, t14, t15])) == None{} : Maybe<&2, List<&2, U32>>}