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author | wolfbeast <mcwerewolf@gmail.com> | 2018-04-25 21:33:33 +0200 |
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committer | wolfbeast <mcwerewolf@gmail.com> | 2018-04-25 21:33:33 +0200 |
commit | fba28f19754f62b5227650143d5441fc86d4c7d7 (patch) | |
tree | 26629d73f83543ff92a060fd7b310bb748b13173 /security/nss/lib/freebl/verified/specs/Spec.CTR.fst | |
parent | b4154e043bfc0d2f301d88304efc896989d650bf (diff) | |
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Revert "Update NSS to 3.35-RTM"
This reverts commit f1a0f0a56fdd0fc39f255174ce08c06b91c66c94.
Diffstat (limited to 'security/nss/lib/freebl/verified/specs/Spec.CTR.fst')
-rw-r--r-- | security/nss/lib/freebl/verified/specs/Spec.CTR.fst | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/security/nss/lib/freebl/verified/specs/Spec.CTR.fst b/security/nss/lib/freebl/verified/specs/Spec.CTR.fst deleted file mode 100644 index e411cd353..000000000 --- a/security/nss/lib/freebl/verified/specs/Spec.CTR.fst +++ /dev/null @@ -1,98 +0,0 @@ -/* Copyright 2016-2017 INRIA and Microsoft Corporation - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -module Spec.CTR - -module ST = FStar.HyperStack.ST - -open FStar.Mul -open FStar.Seq -open Spec.Lib - -#reset-options "--initial_fuel 0 --max_fuel 0 --initial_ifuel 0 --max_ifuel 0" - -type block_cipher_ctx = { - keylen: nat ; - blocklen: (x:nat{x>0}); - noncelen: nat; - counterbits: nat; - incr: pos} - -type key (c:block_cipher_ctx) = lbytes c.keylen -type nonce (c:block_cipher_ctx) = lbytes c.noncelen -type block (c:block_cipher_ctx) = lbytes (c.blocklen*c.incr) -type counter (c:block_cipher_ctx) = UInt.uint_t c.counterbits -type block_cipher (c:block_cipher_ctx) = key c -> nonce c -> counter c -> block c - -val xor: #len:nat -> x:lbytes len -> y:lbytes len -> Tot (lbytes len) -let xor #len x y = map2 FStar.UInt8.(fun x y -> x ^^ y) x y - - -val counter_mode_blocks: - ctx: block_cipher_ctx -> - bc: block_cipher ctx -> - k:key ctx -> n:nonce ctx -> c:counter ctx -> - plain:seq UInt8.t{c + ctx.incr * (length plain / ctx.blocklen) < pow2 ctx.counterbits /\ - length plain % (ctx.blocklen * ctx.incr) = 0} -> - Tot (lbytes (length plain)) - (decreases (length plain)) -#reset-options "--z3rlimit 200 --max_fuel 0" -let rec counter_mode_blocks ctx block_enc key nonce counter plain = - let len = length plain in - let len' = len / (ctx.blocklen * ctx.incr) in - Math.Lemmas.lemma_div_mod len (ctx.blocklen * ctx.incr) ; - if len = 0 then Seq.createEmpty #UInt8.t - else ( - let prefix, block = split plain (len - ctx.blocklen * ctx.incr) in - (* TODO: move to a single lemma for clarify *) - Math.Lemmas.lemma_mod_plus (length prefix) 1 (ctx.blocklen * ctx.incr); - Math.Lemmas.lemma_div_le (length prefix) len ctx.blocklen; - Spec.CTR.Lemmas.lemma_div len (ctx.blocklen * ctx.incr); - (* End TODO *) - let cipher = counter_mode_blocks ctx block_enc key nonce counter prefix in - let mask = block_enc key nonce (counter + (len / ctx.blocklen - 1) * ctx.incr) in - let eb = xor block mask in - cipher @| eb - ) - - -val counter_mode: - ctx: block_cipher_ctx -> - bc: block_cipher ctx -> - k:key ctx -> n:nonce ctx -> c:counter ctx -> - plain:seq UInt8.t{c + ctx.incr * (length plain / ctx.blocklen) < pow2 ctx.counterbits} -> - Tot (lbytes (length plain)) - (decreases (length plain)) -#reset-options "--z3rlimit 200 --max_fuel 0" -let counter_mode ctx block_enc key nonce counter plain = - let len = length plain in - let blocks_len = (ctx.incr * ctx.blocklen) * (len / (ctx.blocklen * ctx.incr)) in - let part_len = len % (ctx.blocklen * ctx.incr) in - (* TODO: move to a single lemma for clarify *) - Math.Lemmas.lemma_div_mod len (ctx.blocklen * ctx.incr); - Math.Lemmas.multiple_modulo_lemma (len / (ctx.blocklen * ctx.incr)) (ctx.blocklen * ctx.incr); - Math.Lemmas.lemma_div_le (blocks_len) len ctx.blocklen; - (* End TODO *) - let blocks, last_block = split plain blocks_len in - let cipher_blocks = counter_mode_blocks ctx block_enc key nonce counter blocks in - let cipher_last_block = - if part_len > 0 - then (* encrypt final partial block(s) *) - let mask = block_enc key nonce (counter+ctx.incr*(length plain / ctx.blocklen)) in - let mask = slice mask 0 part_len in - assert(length last_block = part_len); - xor #part_len last_block mask - else createEmpty in - cipher_blocks @| cipher_last_block |