diff --git a/Cargo.lock b/Cargo.lock
index 9cf4512..d1df29a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,20 +11,11 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "arrayvec"
-version = "0.4.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1e964f9e24d588183fcb43503abda40d288c8657dfc27311516ce2f05675aef"
-dependencies = [
- "nodrop",
-]
-
 [[package]]
 name = "base64"
-version = "0.9.0"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "229d032f1a99302697f10b27167ae6d03d49d032e6a8e2550e8d3fc13356d2b4"
+checksum = "489d6c0ed21b11d038c31b6ceccca973e65d73ba3bd8ecb9a2babf5546164643"
 dependencies = [
  "byteorder",
  "safemem",
@@ -32,67 +23,33 @@ dependencies = [
 
 [[package]]
 name = "bitflags"
-version = "1.0.1"
+version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b3c30d3802dfb7281680d6285f2ccdaa8c2d8fee41f93805dba5c4cf50dc23cf"
+checksum = "cf4b9d6a944f767f8e5e0db018570623c85f3d925ac718db4e06d0187adb21c1"
 
 [[package]]
 name = "byteorder"
-version = "1.2.2"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73b5bdfe7ee3ad0b99c9801d58807a9dbc9e09196365b0203853b99889ab3c87"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
 [[package]]
 name = "cc"
-version = "1.0.9"
+version = "1.0.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b4911e4bdcb4100c7680e7e854ff38e23f1b34d4d9e079efae3da2801341ffc"
+checksum = "1fd97381a8cc6493395a5afc4c691c1084b3768db713b73aa215217aa245d153"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.2"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
-
-[[package]]
-name = "crossbeam-deque"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f739f8c5363aca78cfb059edf753d8f0d36908c348f3d8d1503f03d8b75d9cf3"
-dependencies = [
- "crossbeam-epoch",
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-epoch"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "927121f5407de9956180ff5e936fe3cf4324279280001cd56b669d28ee7e9150"
-dependencies = [
- "arrayvec",
- "cfg-if",
- "crossbeam-utils",
- "lazy_static 1.0.0",
- "memoffset",
- "nodrop",
- "scopeguard",
-]
-
-[[package]]
-name = "crossbeam-utils"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2760899e32a1d58d5abb31129f8fae5de75220bc2176e77ff7c627ae45c918d9"
-dependencies = [
- "cfg-if",
-]
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "either"
-version = "1.5.0"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3be565ca5c557d7f59e7cfcf1844f9e3033650c929c6566f511e8005f205c1d0"
+checksum = "11157ac094ffbdde99aa67b23417ebdd801842852b500e395a45a9c0aac03e4a"
 
 [[package]]
 name = "env_logger"
@@ -104,12 +61,28 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "errno"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a258e46cdc063eb8519c00b9fc845fc47bcfca4130e2f08e88665ceda8474245"
+dependencies = [
+ "libc",
+ "windows-sys",
+]
+
 [[package]]
 name = "error-chain"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ff511d5dc435d703f4971bc399647c9bc38e20cb41452e3b9feb4765419ed3f3"
 
+[[package]]
+name = "fastrand"
+version = "2.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "658bd65b1cf4c852a3cc96f18a8ce7b5640f6b703f905c7d74532294c2a63984"
+
 [[package]]
 name = "flate2"
 version = "0.2.20"
@@ -121,32 +94,36 @@ dependencies = [
 ]
 
 [[package]]
-name = "fuchsia-zircon"
-version = "0.3.3"
+name = "fuchsia-cprng"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
+checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
+
+[[package]]
+name = "getrandom"
+version = "0.2.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06fddc2749e0528d2813f95e050e87e52c8cbbae56223b9babf73b3e53b0cc6"
 dependencies = [
- "bitflags",
- "fuchsia-zircon-sys",
+ "cfg-if",
+ "libc",
+ "wasi",
 ]
 
 [[package]]
-name = "fuchsia-zircon-sys"
-version = "0.3.3"
+name = "home"
+version = "0.5.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
-
-[[package]]
-name = "gcc"
-version = "0.3.54"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e33ec290da0d127825013597dbdfc28bee4964690c7ce1166cbc2a7bd08b1bb"
+checksum = "e3d1354bf6b7235cb4a0576c2619fd4ed18183f689b12b006a0ee7329eeff9a5"
+dependencies = [
+ "windows-sys",
+]
 
 [[package]]
 name = "itertools"
-version = "0.7.8"
+version = "0.7.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f58856976b776fedd95533137617a02fb25719f40e7d9b01c7043cd65474f450"
+checksum = "0d47946d458e94a1b7bcabbf6521ea7c037062c81f534615abcad76e84d4970d"
 dependencies = [
  "either",
 ]
@@ -163,31 +140,23 @@ dependencies = [
 
 [[package]]
 name = "lamport_sigs"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5dff26ae558be16afda65815c847447c81eede19c639982e49e33bd15973d857"
+version = "0.7.1-pre"
+source = "git+https://github.com/mii443/lamport_sigs.rs#7c69b4c124979cd453a0a2df72cee90ae3a45dd0"
 dependencies = [
- "rand 0.3.22",
  "ring",
 ]
 
-[[package]]
-name = "lazy_static"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76f033c7ad61445c5b347c7382dd1237847eb1bce590fe50365dcb33d546be73"
-
-[[package]]
-name = "lazy_static"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c8f31047daa365f19be14b47c29df4f7c3b581832407daabe6ae77397619237d"
-
 [[package]]
 name = "libc"
-version = "0.2.40"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6fd41f331ac7c5b8ac259b8bf82c75c0fb2e469bbf37d2becbba9a6a2221965b"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
+
+[[package]]
+name = "linux-raw-sys"
+version = "0.4.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01cda141df6706de531b6c46c3a33ecca755538219bd484262fa09410c13539c"
 
 [[package]]
 name = "log"
@@ -195,17 +164,14 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
 dependencies = [
- "log 0.4.1",
+ "log 0.4.21",
 ]
 
 [[package]]
 name = "log"
-version = "0.4.1"
+version = "0.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89f010e843f2b1a31dbd316b3b8d443758bc634bed37aabade59c686d644e0a2"
-dependencies = [
- "cfg-if",
-]
+checksum = "90ed8c1e510134f979dbc4f070f87d4313098b704861a105fe34231c70a3901c"
 
 [[package]]
 name = "memchr"
@@ -216,27 +182,20 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "memoffset"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f9dc261e2b62d7a622bf416ea3c5245cdd5d9a7fcc428c0d06804dfce1775b3"
-
 [[package]]
 name = "merkle"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6311caa1c5c71548021dfc5f6113fca485d453185fdc44da92bafe266f6a5fe"
+version = "1.11.1-pre"
+source = "git+https://github.com/mii443/merkle.rs#445fe733bcc7d7a64302a63d3e48aebf29161e08"
 dependencies = [
- "protobuf",
+ "protobuf 2.28.0",
+ "protoc-rust",
  "ring",
 ]
 
 [[package]]
 name = "merkle_sigs"
-version = "1.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94367864019d3b781c28c67d0a7057da0df498525982869c47ecfd73ece29f26"
+version = "1.7.1-pre"
+source = "git+https://github.com/mii443/merkle_sigs.rs#ecad843d7b69aa13ba3310879f70f5fc4db0b7c4"
 dependencies = [
  "lamport_sigs",
  "merkle",
@@ -245,28 +204,19 @@ dependencies = [
 
 [[package]]
 name = "miniz-sys"
-version = "0.1.10"
+version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "609ce024854aeb19a0ef7567d348aaa5a746b32fb72e336df7fcc16869d7e2b4"
+checksum = "1e9e3ae51cea1576ceba0dde3d484d30e6e5b86dee0b2d412fe3a16a15c98202"
 dependencies = [
  "cc",
  "libc",
 ]
 
 [[package]]
-name = "nodrop"
-version = "0.1.12"
+name = "once_cell"
+version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a2228dca57108069a5262f2ed8bd2e82496d2e074a06d1ccc7ce1687b6ae0a2"
-
-[[package]]
-name = "num_cpus"
-version = "1.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c51a3322e4bca9d212ad9a158a02abc6934d005490c054a2778df73a70aa0a30"
-dependencies = [
- "libc",
-]
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
 [[package]]
 name = "protobuf"
@@ -274,6 +224,43 @@ version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "40e2484e639dcae0985fc483ad76ce7ad78ee5aa092751d7d538f0b20d76486b"
 
+[[package]]
+name = "protobuf"
+version = "2.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "106dd99e98437432fed6519dedecfade6a06a73bb7b2a1e019fdd2bee5778d94"
+
+[[package]]
+name = "protobuf-codegen"
+version = "2.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "033460afb75cf755fcfc16dfaed20b86468082a2ea24e05ac35ab4a099a017d6"
+dependencies = [
+ "protobuf 2.28.0",
+]
+
+[[package]]
+name = "protoc"
+version = "2.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a0218039c514f9e14a5060742ecd50427f8ac4f85a6dc58f2ddb806e318c55ee"
+dependencies = [
+ "log 0.4.21",
+ "which",
+]
+
+[[package]]
+name = "protoc-rust"
+version = "2.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22f8a182bb17c485f20bdc4274a8c39000a61024cfe461c799b50fec77267838"
+dependencies = [
+ "protobuf 2.28.0",
+ "protobuf-codegen",
+ "protoc",
+ "tempfile",
+]
+
 [[package]]
 name = "quickcheck"
 version = "0.4.1"
@@ -282,51 +269,54 @@ checksum = "02c2411d418cea2364325b18a205664f9ef8252e06b2e911db97c0b0d98b1406"
 dependencies = [
  "env_logger",
  "log 0.3.9",
- "rand 0.3.22",
+ "rand 0.3.23",
 ]
 
 [[package]]
 name = "rand"
-version = "0.3.22"
+version = "0.3.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "15a732abf9d20f0ad8eeb6f909bf6868722d9a06e1e50802b6a70351f40b4eb1"
+checksum = "64ac302d8f83c0c1974bf758f6b041c6c8ada916fbb44a609158ca8b064cc76c"
 dependencies = [
- "fuchsia-zircon",
  "libc",
- "rand 0.4.2",
+ "rand 0.4.6",
 ]
 
 [[package]]
 name = "rand"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "552840b97013b1a26992c11eac34bdd778e464601a4c2054b5f0bff7c6761293"
+dependencies = [
+ "fuchsia-cprng",
+ "libc",
+ "rand_core 0.3.1",
+ "rdrand",
+ "winapi 0.3.9",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a6fdeb83b075e8266dcc8762c22776f6877a63111121f5f8c7411e5be7eed4b"
+dependencies = [
+ "rand_core 0.4.2",
+]
+
+[[package]]
+name = "rand_core"
 version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eba5f8cb59cc50ed56be8880a5c7b496bfd9bd26394e176bc67884094145c2c5"
-dependencies = [
- "fuchsia-zircon",
- "libc",
- "winapi 0.3.4",
-]
+checksum = "9c33a3c44ca05fa6f1807d8e6743f3824e8509beca625669633be0acbdf509dc"
 
 [[package]]
-name = "rayon"
-version = "0.8.2"
+name = "rdrand"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b614fe08b6665cb9a231d07ac1364b0ef3cb3698f1239ee0c4c3a88a524f54c8"
+checksum = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
 dependencies = [
- "rayon-core",
-]
-
-[[package]]
-name = "rayon-core"
-version = "1.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d24ad214285a7729b174ed6d3bcfcb80177807f959d95fafd5bfc5c4f201ac8"
-dependencies = [
- "crossbeam-deque",
- "lazy_static 1.0.0",
- "libc",
- "num_cpus",
- "rand 0.4.2",
+ "rand_core 0.3.1",
 ]
 
 [[package]]
@@ -350,15 +340,30 @@ checksum = "f9ec002c35e86791825ed294b50008eea9ddfc8def4420124fbc6b08db834957"
 
 [[package]]
 name = "ring"
-version = "0.12.1"
+version = "0.17.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f7d28b30a72c01b458428e0ae988d4149c20d902346902be881e3edc4bb325c"
+checksum = "c17fa4cb658e3583423e915b9f3acc01cceaee1860e33d59ebae66adc3a2dc0d"
 dependencies = [
- "gcc",
- "lazy_static 0.2.11",
+ "cc",
+ "cfg-if",
+ "getrandom",
  "libc",
- "rayon",
+ "spin",
  "untrusted",
+ "windows-sys",
+]
+
+[[package]]
+name = "rustix"
+version = "0.38.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "65e04861e65f21776e67888bfbea442b3642beaa0138fdb1dd7a84a52dffdb89"
+dependencies = [
+ "bitflags",
+ "errno",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys",
 ]
 
 [[package]]
@@ -370,23 +375,35 @@ dependencies = [
  "flate2",
  "itertools",
  "merkle_sigs",
- "protobuf",
+ "protobuf 1.5.1",
  "quickcheck",
- "rand 0.4.2",
+ "rand 0.4.6",
  "ring",
 ]
 
 [[package]]
 name = "safemem"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e27a8b19b835f7aea908818e871f5cc3a5a186550c30773be987e155e8163d8f"
-
-[[package]]
-name = "scopeguard"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94258f53601af11e6a49f722422f6e3425c52b06245a5cf9bc09908b174f5e27"
+checksum = "ef703b7cb59335eae2eb93ceb664c0eb7ea6bf567079d843e09420219668e072"
+
+[[package]]
+name = "spin"
+version = "0.9.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
+
+[[package]]
+name = "tempfile"
+version = "3.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85b77fafb263dd9d05cbeac119526425676db3784113aa9295c88498cbf8bff1"
+dependencies = [
+ "cfg-if",
+ "fastrand",
+ "rustix",
+ "windows-sys",
+]
 
 [[package]]
 name = "thread-id"
@@ -409,9 +426,9 @@ dependencies = [
 
 [[package]]
 name = "untrusted"
-version = "0.5.1"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f392d7819dbe58833e26872f5f6f0d68b7bbbe90fc3667e98731c4a15ad9a7ae"
+checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
 
 [[package]]
 name = "utf8-ranges"
@@ -419,6 +436,24 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f"
 
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
+[[package]]
+name = "which"
+version = "4.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87ba24419a2078cd2b0f2ede2691b6c66d8e47836da3b6db8265ebad47afbfc7"
+dependencies = [
+ "either",
+ "home",
+ "once_cell",
+ "rustix",
+]
+
 [[package]]
 name = "winapi"
 version = "0.2.8"
@@ -427,9 +462,9 @@ checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 
 [[package]]
 name = "winapi"
-version = "0.3.4"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04e3bd221fcbe8a271359c04f21a76db7d0c6028862d1bb5512d85e1e2eb5bb3"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
 dependencies = [
  "winapi-i686-pc-windows-gnu",
  "winapi-x86_64-pc-windows-gnu",
@@ -452,3 +487,69 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dd37b7e5ab9018759f893a1952c9420d060016fc19a472b4bb20d1bdd694d1b"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bcf46cf4c365c6f2d1cc93ce535f2c8b244591df96ceee75d8e83deb70a9cac9"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da9f259dd3bcf6990b55bffd094c4f7235817ba4ceebde8e6d11cd0c5633b675"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b474d8268f99e0995f25b9f095bc7434632601028cf86590aea5c8a5cb7801d3"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1515e9a29e5bed743cb4415a9ecf5dfca648ce85ee42e15873c3cd8610ff8e02"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5eee091590e89cc02ad514ffe3ead9eb6b660aedca2183455434b93546371a03"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77ca79f2451b49fa9e2af39f0747fe999fcda4f5e241b2898624dca97a1f2177"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32b752e52a2da0ddfbdbcc6fceadfeede4c939ed16d13e648833a61dfb611ed8"
diff --git a/Cargo.toml b/Cargo.toml
index 53378e0..c13c6c7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ base64 = "0.9.0"
 rand = "^0.4.2"
 ring = "0.17.8"
 merkle_sigs = { git = "https://github.com/mii443/merkle_sigs.rs" }
-protobuf = "3.4.0"
+protobuf = ">= 1.4, < 1.6"
 
 [dependencies.error-chain]
 version = "0.11.0"
diff --git a/src/vol_hash.rs b/src/vol_hash.rs
index 1db0310..512ec66 100644
--- a/src/vol_hash.rs
+++ b/src/vol_hash.rs
@@ -36,7 +36,7 @@ impl VOLHash {
 
         let mut state = ctx.finish().as_ref().to_vec();
 
-        let iter_num = len / self.algorithm.output_len;
+        let iter_num = len / self.algorithm.output_len();
 
         for i in 0..iter_num {
             let mut inner_ctx = Context::new(self.algorithm);