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////////////////////////////////////////////////////////////////
// Copyright 2020 Galois, Inc. All Rights Reserved
//
// Authors:
// Aaron Tomb : atomb@galois.com
// Nathan Collins : conathan@galois.com
// Joey Dodds : jdodds@galois.com
//
// Licensed under the Apache License, Version 2.0 (the "License").
// You may not use this file except in compliance with the License.
// A copy of the License is located at
//
// http://aws.amazon.com/apache2.0
//
// or in the "license" file accompanying this file. This file 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.
//
////////////////////////////////////////////////////////////////
enable_experimental;
include "HMAC/spec/HMAC.saw";
m <- llvm_load_module "bitcode/all_llvm.bc";
// Verifies s2n_hmac_init at 3 key sizes in the given config
let verify_s2n_hmac_init
(cfg : { name : String
, hmac_alg : Term
, digest_size : Int
, block_size : Int
, hash_block_size : Int
}) = do {
set_base 16;
print "";
print (str_concat "Verifying HMAC init: alg = " cfg.name);
print "Creating hash overrides...";
(t, hash_init_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_init" hash_init_spec);
(t, hmac_digest_size_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hmac_digest_size" (hmac_digest_size_spec cfg));
(t, hash_copy_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_copy" hash_copy_spec);
(t, hash_reset_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_reset" hash_reset_spec);
(t, hash_get_currently_in_hash_total_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_get_currently_in_hash_total" (hash_get_currently_in_hash_total_spec));
(t, hash_update_block_size_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_update" (hash_update_spec cfg.block_size));
(t, hash_update_key_size_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_update" hash_update_unbounded_spec);
(t, hash_digest_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_digest" (hash_digest_spec (cfg.digest_size)));
print "Done";
let ovs =
[ hash_init_ov
, hmac_digest_size_ov
, hash_copy_ov
, hash_reset_ov
, hash_get_currently_in_hash_total_ov
, hash_update_block_size_ov
, hash_update_key_size_ov
, hash_digest_ov
];
let block_size = cfg.block_size;
with_time (crucible_llvm_verify m "s2n_hmac_init" ovs false (hmac_init_spec cfg) z3_hash_unint);
print "Finished proving s2n_hmac_init";
};
// Verifies s2n_hmac_update at the given message sizes and config
let verify_s2n_hmac_update
(cfg : { name : String
, hmac_alg : Term
, digest_size : Int
, block_size : Int
, hash_block_size : Int
}) = do {
set_base 16;
print "";
print (str_concat "Verifying HMAC update: alg = " cfg.name);
(t, hash_update_msg_size_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_update" hash_update_unbounded_spec);
with_time (crucible_llvm_verify m "s2n_hmac_update" [hash_update_msg_size_ov] false (hmac_update_spec cfg) z3_hash_unint);
print "Finished proving s2n_hmac_update";
};
// Verifies s2n_hmac_digest
let verify_s2n_hmac_digest
(cfg : { name : String
, hmac_alg : Term
, digest_size : Int
, block_size : Int
, hash_block_size : Int
}) = do {
set_base 16;
print "";
print (str_concat "Verifying HMAC digest: alg = " cfg.name);
print "Creating hash overrides...";
(t, hash_copy_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_copy" hash_copy_spec);
(t, hash_update_block_size_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_update" (hash_update_spec cfg.digest_size));
(t, hash_digest_ov) <- with_time (crucible_llvm_unsafe_assume_spec m "s2n_hash_digest" (hash_digest_spec (cfg.digest_size)));
print "Done";
let ovs =
[ hash_copy_ov
, hash_update_block_size_ov
, hash_digest_ov
];
(t, hmac_digest_ov) <-
with_time (crucible_llvm_verify m "s2n_hmac_digest" ovs false (hmac_digest_spec cfg) z3_hash_unint);
print "Finished proving s2n_hmac_digest";
};
let none_cfg =
{ name = "NONE"
, hmac_alg = {{ S2N_HMAC_NONE }}
, digest_size = 0
, block_size = 64
, hash_block_size = 64
};
// let sslv3_md5_cfg = <not supported>
let md5_cfg =
{ name = "MD5"
, hmac_alg = {{ S2N_HMAC_MD5 }}
, digest_size = 16
, block_size = 64
, hash_block_size = 64
};
// let sslv3_sha1_cfg = <not supported>
let sha1_cfg =
{ name = "SHA1"
, hmac_alg = {{ S2N_HMAC_SHA1 }}
, digest_size = 20
, block_size = 64
, hash_block_size = 64
};
let sha224_cfg =
{ name = "SHA224"
, hmac_alg = {{ S2N_HMAC_SHA224 }}
, digest_size = 28
, block_size = 64
, hash_block_size = 64
};
let sha256_cfg =
{ name = "SHA256"
, hmac_alg = {{ S2N_HMAC_SHA256 }}
, digest_size = 32
, block_size = 64
, hash_block_size = 64
};
let sha384_cfg =
{ name = "SHA384"
, hmac_alg = {{ S2N_HMAC_SHA384 }}
, digest_size = 48
, block_size = 128
, hash_block_size = 128
};
let sha512_cfg =
{ name = "SHA512"
, hmac_alg = {{ S2N_HMAC_SHA512 }}
, digest_size = 64
, block_size = 128
, hash_block_size = 128
};
let verify_s2n_hmac_at_config
(cfg : { name : String
, hmac_alg : Term
, digest_size : Int
, block_size : Int
, hash_block_size : Int
}) = do {
verify_s2n_hmac_init cfg;
verify_s2n_hmac_update cfg;
verify_s2n_hmac_digest cfg;
};
let verify_s2n_hmac = do {
let configs = [md5_cfg, sha1_cfg, sha224_cfg, sha256_cfg, sha384_cfg, sha512_cfg];
for configs (\config -> verify_s2n_hmac_at_config config);
};
verify_s2n_hmac;
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