Switches to Downstream yubico with Optional libusb

2 files changed, 80 insertions, 262 deletions

diff --git a/Cargo.lock b/Cargo.lock
index c5df2255..7233b0f0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -82,24 +82,14 @@ dependencies = [
 ]
 
 [[package]]
-name = "bit-set"
-version = "0.2.0"
+name = "base64"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bit-vec 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "bit-vec"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "bitflags"
-version = "0.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
 name = "bitflags"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -137,7 +127,7 @@ dependencies = [
  "u2f 0.1.2 (git+https://github.com/wisespace-io/u2f-rs?rev=193de35093a44)",
  "uuid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ws 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "yubico 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "yubico 0.4.0 (git+https://github.com/dani-garcia/yubico-rs)",
 ]
 
 [[package]]
@@ -239,15 +229,6 @@ dependencies = [
 
 [[package]]
 name = "core-foundation"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "core-foundation-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "core-foundation"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -257,14 +238,6 @@ dependencies = [
 
 [[package]]
 name = "core-foundation-sys"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "core-foundation-sys"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -667,31 +640,6 @@ dependencies = [
 
 [[package]]
 name = "hyper"
-version = "0.11.27"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "language-tags 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "mime 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "relay 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "want 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "hyper"
 version = "0.12.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -727,20 +675,6 @@ dependencies = [
 
 [[package]]
 name = "hyper-tls"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-tls 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "hyper-tls"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -912,25 +846,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "libusb"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bit-set 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "libusb-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "libusb-sys"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "lock_api"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1126,20 +1041,6 @@ dependencies = [
 
 [[package]]
 name = "native-tls"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl 0.9.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "schannel 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "native-tls"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -1250,18 +1151,6 @@ dependencies = [
 
 [[package]]
 name = "openssl"
-version = "0.9.24"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.36 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "openssl"
 version = "0.10.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -1501,6 +1390,33 @@ dependencies = [
 ]
 
 [[package]]
+name = "rand"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_isaac 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_xorshift 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "rand_core"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1514,6 +1430,39 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "rand_hc"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_isaac"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_pcg"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_xorshift"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "rayon"
 version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1578,14 +1527,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "relay"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "remove_dir_all"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1595,30 +1536,6 @@ dependencies = [
 
 [[package]]
 name = "reqwest"
-version = "0.8.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "encoding_rs 0.8.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper-tls 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libflate 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "mime_guess 2.0.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_urlencoded 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-tls 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "uuid 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "reqwest"
 version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -1802,28 +1719,12 @@ dependencies = [
 ]
 
 [[package]]
-name = "scoped-tls"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
 name = "scopeguard"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "security-framework"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "core-foundation 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "security-framework"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -1835,15 +1736,6 @@ dependencies = [
 
 [[package]]
 name = "security-framework-sys"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "core-foundation-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "security-framework-sys"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -2134,24 +2026,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "tokio-core"
-version = "0.1.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "scoped-tls 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-timer 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "tokio-current-thread"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2206,14 +2080,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "tokio-service"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "tokio-tcp"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2252,17 +2118,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "tokio-tls"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "tokio-udp"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2307,11 +2162,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "try-lock"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "try-lock"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
@@ -2441,15 +2291,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "uuid"
-version = "0.6.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "uuid"
 version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -2473,16 +2314,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "want"
-version = "0.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "try-lock 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "want"
 version = "0.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -2590,13 +2421,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "yubico"
 version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://github.com/dani-garcia/yubico-rs#f93a88834e4ebaaed0169850ff1a5e32a7d01719"
 dependencies = [
- "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "base64 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libusb 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "reqwest 0.8.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "reqwest 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "threadpool 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2611,12 +2441,10 @@ dependencies = [
 "checksum ascii_utils 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "71938f30533e4d95a6d17aa530939da3842c2ab6f4f84b9dae68447e4129f74a"
 "checksum backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "89a47830402e9981c5c41223151efcced65a0510c13097c769cede7efb34782a"
 "checksum backtrace-sys 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)" = "c66d56ac8dabd07f6aacdaf633f4b8262f5b3601a810a0dcddffd5c22c69daa0"
+"checksum base64 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "621fc7ecb8008f86d7fb9b95356cd692ce9514b80a86d85b397f32a22da7b9e2"
 "checksum base64 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "30e93c03064e7590d0466209155251b90c22e37fab1daf2771582598b5827557"
 "checksum base64 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "96434f987501f0ed4eb336a411e0631ecd1afa11574fe148587adc4ff96143c9"
 "checksum base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "489d6c0ed21b11d038c31b6ceccca973e65d73ba3bd8ecb9a2babf5546164643"
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 "checksum url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2a321979c09843d272956e73700d12c4e7d3d92b2ee112b31548aef0d4efc5a6"
 "checksum utf8-ranges 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fd70f467df6810094968e2fce0ee1bd0e87157aceb026a8c083bcf5e25b9efe4"
-"checksum uuid 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e1436e58182935dcd9ce0add9ea0b558e8a87befe01c1a301e6020aeb0876363"
 "checksum uuid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dab5c5526c5caa3d106653401a267fed923e7046f35895ffcb5ca42db64942e6"
 "checksum vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "def296d3eb3b12371b2c7d0e83bfe1403e4db2d7a0bba324a12b21c4ee13143d"
 "checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
-"checksum want 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a05d9d966753fa4b5c8db73fcab5eed4549cfe0e1e4e66911e5564a0085c35d1"
 "checksum want 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "797464475f30ddb8830cc529aaaae648d581f99e2036a928877dfde027ddf6b3"
 "checksum webpki 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e499345fc4c6b7c79a5b8756d4592c4305510a13512e79efafe00dfbd67bbac6"
 "checksum webpki 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)" = "493012e46177f3f4ee9cd58fd0c81ecb77e6d6cc6ebce55989b9c33376fbe5ee"
@@ -2887,4 +2702,4 @@ dependencies = [
 "checksum ws 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)" = "d2c221321dca56e6a80aa179d562e1fbe6ae116aeaa9205c76fa64e9e3c49dfc"
 "checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
 "checksum yansi 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d60c3b48c9cdec42fb06b3b84b5b087405e1fa1c644a1af3930e4dfafe93de48"
-"checksum yubico 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "27dcecaa13b0c19dbe156647e59c5d1c15cd6039ca88d3bbf7ef38f732ad3962"
+"checksum yubico 0.4.0 (git+https://github.com/dani-garcia/yubico-rs)" = "<none>"
diff --git a/Cargo.toml b/Cargo.toml
index e993dc43..60b60e54 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -58,7 +58,7 @@ jsonwebtoken = "= 4.0.1"
 u2f = "0.1.2"
 
 # Yubico Library
-yubico="0.4.0"
+yubico= { version = "0.4.0", default-features = false }
 
 # A `dotenv` implementation for Rust
 dotenv = { version = "0.13.0", default-features = false }
@@ -87,3 +87,6 @@ lettre_email = { git = 'https://github.com/lettre/lettre', rev = 'c988b1760ad81'
 
 # Version 0.1.2 from crates.io lacks a commit that fixes a certificate error
 u2f = { git = 'https://github.com/wisespace-io/u2f-rs', rev = '193de35093a44' }
+
+# Allows optional libusb support
+yubico = { git = 'https://github.com/dani-garcia/yubico-rs' }