diff --git a/sim/Cargo.lock b/Cargo.lock
similarity index 65%
rename from sim/Cargo.lock
rename to Cargo.lock
index d930473..1b9a9ab 100644
--- a/sim/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "aes-ctr"
 version = "0.4.0"
@@ -36,20 +38,14 @@
 
 [[package]]
 name = "aho-corasick"
-version = "0.7.8"
+version = "0.7.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "743ad5a418686aad3b87fd14c43badd828cf26e214a00f92a384291cf22e1811"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
 dependencies = [
  "memchr",
 ]
 
 [[package]]
-name = "anyhow"
-version = "1.0.26"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7825f6833612eb2414095684fcf6c635becf3ce97fe48cf6421321e93bfbd53c"
-
-[[package]]
 name = "atty"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -67,6 +63,12 @@
 checksum = "3441f0f7b02788e948e47f457ca01f1d7e6d92c693bc132c22b087d3141c03ff"
 
 [[package]]
+name = "base64"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
+
+[[package]]
 name = "block-cipher"
 version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -80,7 +82,7 @@
 version = "0.1.0"
 dependencies = [
  "aes-ctr",
- "base64",
+ "base64 0.12.3",
  "byteorder",
  "docopt",
  "env_logger",
@@ -99,27 +101,27 @@
 
 [[package]]
 name = "bumpalo"
-version = "3.2.0"
+version = "3.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f359dc14ff8911330a51ef78022d376f25ed00248912803b58f00cb1c27f742"
+checksum = "9c59e7af012c713f529e7a3ee57ce9b31ddd858d4b512923602f74608b009631"
 
 [[package]]
 name = "byteorder"
-version = "1.3.4"
+version = "1.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
 
 [[package]]
 name = "cc"
-version = "1.0.50"
+version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95e28fa049fda1c330bcf9d723be7663a899c4679724b34c81e9f5a326aab8cd"
+checksum = "e70cc2f62c6ce1868963827bd677764c62d07c3d9a3e1fb1177ee1a9ab199eb2"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.10"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "ctr"
@@ -132,9 +134,9 @@
 
 [[package]]
 name = "docopt"
-version = "1.1.0"
+version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f525a586d310c87df72ebcd98009e57f1cc030c8c268305287a476beb653969"
+checksum = "7f3f119846c823f9eafcf953a8f6ffb6ed69bf6240883261a7f13b634579a51f"
 dependencies = [
  "lazy_static",
  "regex",
@@ -157,19 +159,19 @@
 
 [[package]]
 name = "generic-array"
-version = "0.14.2"
+version = "0.14.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac746a5f3bbfdadd6106868134545e684693d54d9d44f6e9588a7d54af0bf980"
+checksum = "501466ecc8a30d1d3b7fc9229b122b2ce8ed6e9d9223f1138d4babb253e51817"
 dependencies = [
  "typenum",
- "version_check 0.9.2",
+ "version_check",
 ]
 
 [[package]]
 name = "getrandom"
-version = "0.1.14"
+version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7abc8dd8451921606d809ba32e95b6111925cd2906060d2dcc29c070220503eb"
+checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
 dependencies = [
  "cfg-if",
  "libc",
@@ -177,19 +179,10 @@
 ]
 
 [[package]]
-name = "heck"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
-dependencies = [
- "unicode-segmentation",
-]
-
-[[package]]
 name = "hermit-abi"
-version = "0.1.6"
+version = "0.1.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eff2656d88f158ce120947499e971d743c05dbcbed62e5bd2f38f1698bbc3772"
+checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
 dependencies = [
  "libc",
 ]
@@ -205,9 +198,9 @@
 
 [[package]]
 name = "js-sys"
-version = "0.3.35"
+version = "0.3.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7889c7c36282151f6bf465be4700359318aef36baa951462382eae49e9577cf9"
+checksum = "83bdfbace3a0e81a4253f73b49e960b053e396a11012cbd49b9b74d6a2b67062"
 dependencies = [
  "wasm-bindgen",
 ]
@@ -220,15 +213,15 @@
 
 [[package]]
 name = "libc"
-version = "0.2.66"
+version = "0.2.98"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d515b1f41455adea1313a4a2ac8a8a477634fbae63cc6100e3aebb207ce61558"
+checksum = "320cfe77175da3a483efed4bc0adc1968ca050b098ce4f2f1c13a56626128790"
 
 [[package]]
 name = "log"
-version = "0.4.8"
+version = "0.4.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
+checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
 dependencies = [
  "cfg-if",
 ]
@@ -245,25 +238,15 @@
 
 [[package]]
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-version = "2.3.0"
+version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3197e20c7edb283f87c071ddfc7a2cca8f8e0b888c242959846a6fce03c72223"
-
-[[package]]
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-version = "4.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2ad2a91a8e869eeb30b9cb3119ae87773a8f4ae617f41b1eb9c154b2905f7bd6"
-dependencies = [
- "memchr",
- "version_check 0.1.5",
-]
+checksum = "b16bd47d9e329435e309c58469fe0791c2d0d1ba96ec0954152a5ae2b04387dc"
 
 [[package]]
 name = "once_cell"
-version = "1.4.0"
+version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b631f7e854af39a1739f401cf34a8a013dfe09eac4fa4dba91e9768bd28168d"
+checksum = "692fcb63b64b1758029e0a96ee63e049ce8c5948587f2f7208df04625e5f6b56"
 
 [[package]]
 name = "opaque-debug"
@@ -273,26 +256,26 @@
 
 [[package]]
 name = "pem"
-version = "0.8.1"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59698ea79df9bf77104aefd39cc3ec990cb9693fb59c3b0a70ddf2646fdffb4b"
+checksum = "fd56cbd21fea48d0c440b41cd69c589faacade08c992d9a54e471b79d0fd13eb"
 dependencies = [
- "base64",
+ "base64 0.13.0",
  "once_cell",
  "regex",
 ]
 
 [[package]]
 name = "ppv-lite86"
-version = "0.2.8"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "237a5ed80e274dbc66f86bd59c1e25edc039660be53194b5fe0a482e0f2612ea"
+checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.8"
+version = "1.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3acb317c6ff86a4e579dfa00fc5e6cca91ecbb4e7eb2df0468805b674eb88548"
+checksum = "5c7ed8b8c7b886ea3ed7dde405212185f423ab44682667c8c6dd14aa1d9f6612"
 dependencies = [
  "unicode-xid",
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@@ -305,9 +288,9 @@
 
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 name = "quote"
-version = "1.0.2"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "053a8c8bcc71fcce321828dc897a98ab9760bef03a4fc36693c231e5b3216cfe"
+checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7"
 dependencies = [
  "proc-macro2",
 ]
@@ -365,31 +348,30 @@
 
 [[package]]
 name = "regex"
-version = "1.3.4"
+version = "1.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "322cf97724bea3ee221b78fe25ac9c46114ebb51747ad5babd51a2fc6a8235a8"
+checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
 dependencies = [
  "aho-corasick",
  "memchr",
  "regex-syntax",
- "thread_local",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.14"
+version = "0.6.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b28dfe3fe9badec5dbf0a79a9cccad2cfc2ab5484bdb3e44cbd1ae8b3ba2be06"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
 
 [[package]]
 name = "ring"
-version = "0.16.11"
+version = "0.16.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "741ba1704ae21999c00942f9f5944f801e977f54302af346b596287599ad1862"
+checksum = "3053cf52e236a3ed746dfc745aa9cacf1b791d846bdaf412f60a8d7d6e17c8fc"
 dependencies = [
  "cc",
- "lazy_static",
  "libc",
+ "once_cell",
  "spin",
  "untrusted",
  "web-sys",
@@ -398,18 +380,18 @@
 
 [[package]]
 name = "serde"
-version = "1.0.104"
+version = "1.0.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "414115f25f818d7dfccec8ee535d76949ae78584fc4f79a6f45a904bf8ab4449"
+checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.104"
+version = "1.0.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "128f9e303a5a29922045a830221b8f78ec74a5f544944f3d5984f8ec3895ef64"
+checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -426,12 +408,6 @@
 ]
 
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-name = "sourcefile"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bf77cb82ba8453b42b6ae1d692e4cdc92f9a47beaf89a847c8be83f4e328ad3"
-
-[[package]]
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 version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -449,15 +425,15 @@
 
 [[package]]
 name = "strsim"
-version = "0.9.3"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6446ced80d6c486436db5c078dde11a9f73d42b57fb273121e160b84f63d894c"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "syn"
-version = "1.0.14"
+version = "1.0.74"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af6f3550d8dff9ef7dc34d384ac6f107e5d31c8f57d9f28e0081503f547ac8f5"
+checksum = "1873d832550d4588c3dbc20f01361ab00bfe741048f71e3fecf145a7cc18b29c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -466,27 +442,27 @@
 
 [[package]]
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-version = "1.1.0"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
+checksum = "2dfed899f0eb03f32ee8c6a0aabdb8a7949659e3466561fc0adf54e26d88c5f4"
 dependencies = [
  "winapi-util",
 ]
 
 [[package]]
 name = "thiserror"
-version = "1.0.21"
+version = "1.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "318234ffa22e0920fe9a40d7b8369b5f649d490980cf7aadcf1eb91594869b42"
+checksum = "93119e4feac1cbe6c798c34d3a53ea0026b0b1de6a120deef895137c0529bfe2"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
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-version = "1.0.21"
+version = "1.0.26"
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-checksum = "cae2447b6282786c3493999f40a9be2a6ad20cb8bd268b0a0dbf5a065535c0ab"
+checksum = "060d69a0afe7796bf42e9e2ff91f5ee691fb15c53d38b4b62a9a53eb23164745"
 dependencies = [
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  "quote",
@@ -494,49 +470,28 @@
 ]
 
 [[package]]
-name = "thread_local"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
-dependencies = [
- "lazy_static",
-]
-
-[[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "879f6906492a7cd215bfa4cf595b600146ccfac0c79bcbd1f3000162af5e8b06"
 
 [[package]]
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-version = "1.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
-
-[[package]]
 name = "unicode-xid"
-version = "0.2.0"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
 
 [[package]]
 name = "untrusted"
-version = "0.7.0"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "60369ef7a31de49bcb3f6ca728d4ba7300d9a1658f94c727d4cab8c8d9f4aece"
+checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
 
 [[package]]
 name = "version_check"
-version = "0.1.5"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
-
-[[package]]
-name = "version_check"
-version = "0.9.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
+checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
 
 [[package]]
 name = "wasi"
@@ -546,9 +501,9 @@
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.58"
+version = "0.2.74"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5205e9afdf42282b192e2310a5b463a6d1c1d774e30dc3c791ac37ab42d2616c"
+checksum = "d54ee1d4ed486f78874278e63e4069fc1ab9f6a18ca492076ffb90c5eb2997fd"
 dependencies = [
  "cfg-if",
  "wasm-bindgen-macro",
@@ -556,9 +511,9 @@
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.58"
+version = "0.2.74"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "11cdb95816290b525b32587d76419facd99662a07e59d3cdb560488a819d9a45"
+checksum = "3b33f6a0694ccfea53d94db8b2ed1c3a8a4c86dd936b13b9f0a15ec4a451b900"
 dependencies = [
  "bumpalo",
  "lazy_static",
@@ -571,9 +526,9 @@
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.58"
+version = "0.2.74"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "574094772ce6921576fb6f2e3f7497b8a76273b6db092be18fc48a082de09dc3"
+checksum = "088169ca61430fe1e58b8096c24975251700e7b1f6fd91cc9d59b04fb9b18bd4"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -581,9 +536,9 @@
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.58"
+version = "0.2.74"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e85031354f25eaebe78bb7db1c3d86140312a911a106b2e29f9cc440ce3e7668"
+checksum = "be2241542ff3d9f241f5e2cb6dd09b37efe786df8851c54957683a49f0987a97"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -594,53 +549,25 @@
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.58"
+version = "0.2.74"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f5e7e61fc929f4c0dddb748b102ebf9f632e2b8d739f2016542b4de2965a9601"
-
-[[package]]
-name = "wasm-bindgen-webidl"
-version = "0.2.58"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef012a0d93fc0432df126a8eaf547b2dce25a8ce9212e1d3cbeef5c11157975d"
-dependencies = [
- "anyhow",
- "heck",
- "log",
- "proc-macro2",
- "quote",
- "syn",
- "wasm-bindgen-backend",
- "weedle",
-]
+checksum = "d7cff876b8f18eed75a66cf49b65e7f967cb354a7aa16003fb55dbfd25b44b4f"
 
 [[package]]
 name = "web-sys"
-version = "0.3.35"
+version = "0.3.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aaf97caf6aa8c2b1dac90faf0db529d9d63c93846cca4911856f78a83cebf53b"
+checksum = "e828417b379f3df7111d3a2a9e5753706cae29c41f7c4029ee9fd77f3e09e582"
 dependencies = [
- "anyhow",
  "js-sys",
- "sourcefile",
  "wasm-bindgen",
- "wasm-bindgen-webidl",
-]
-
-[[package]]
-name = "weedle"
-version = "0.10.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3bb43f70885151e629e2a19ce9e50bd730fd436cfd4b666894c9ce4de9141164"
-dependencies = [
- "nom",
 ]
 
 [[package]]
 name = "winapi"
-version = "0.3.8"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
 dependencies = [
  "winapi-i686-pc-windows-gnu",
  "winapi-x86_64-pc-windows-gnu",
@@ -654,9 +581,9 @@
 
 [[package]]
 name = "winapi-util"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ccfbf554c6ad11084fb7517daca16cfdcaccbdadba4fc336f032a8b12c2ad80"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
 dependencies = [
  "winapi",
 ]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..834fd7a
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[workspace]
+members = ["sim"]
+exclude = ["ptest"]
+
+# The simulator runs very slowly without optimization.  A value of 1
+# compiles in about half the time, but runs about 5-6 times slower.  2
+# and 3 are hardly different in either compile time or performance.
+# Use 2 in case that makes the code slightly more debuggable.
+[profile.test]
+opt-level = 2
+
+[profile.dev]
+opt-level = 0
diff --git a/sim/Cargo.toml b/sim/Cargo.toml
index dfc97e3..5f5f468 100644
--- a/sim/Cargo.toml
+++ b/sim/Cargo.toml
@@ -48,13 +48,3 @@
 aes-ctr = "0.4.0"
 base64 = "0.12.0"
 typenum = "1.13.0"
-
-# The simulator runs very slowly without optimization.  A value of 1
-# compiles in about half the time, but runs about 5-6 times slower.  2
-# and 3 are hardly different in either compile time or performance.
-# Use 2 in case that makes the code slightly more debuggable.
-[profile.test]
-opt-level = 2
-
-[profile.dev]
-opt-level = 2