Update nitrokey crate to 0.4.0

This change finally updates the version of the nitrokey crate that we
consume to 0.4.0. Along with that we update rand_core, one of its
dependencies, to 0.5.1. Further more we add cfg-if in version 0.1.10 and
getrandom in version 0.1.13, both of which are now new (non-development)
dependencies.

Import subrepo nitrokey/:nitrokey at e81057037e9b4f370b64c0a030a725bc6bdfb870
Import subrepo cfg-if/:cfg-if at 4484a6faf816ff8058088ad857b0c6bb2f4b02b2
Import subrepo getrandom/:getrandom at d661aa7e1b8cc80b47dabe3d2135b3b47d2858af
Import subrepo rand/:rand at d877ed528248b52d947e0484364a4e1ae59ca502

8 files changed, 543 insertions, 0 deletions

diff --git a/cfg-if/.github/workflows/main.yml b/cfg-if/.github/workflows/main.yml
new file mode 100644
index 0000000..411ffe7
--- /dev/null
+++ b/cfg-if/.github/workflows/main.yml
@@ -0,0 +1,53 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust: [stable, beta, nightly]
+    steps:
+      - uses: actions/checkout@master
+      - name: Install Rust Stable
+        run: |
+          rustup self update
+          rustup update ${{ matrix.rust }}
+          rustup default ${{ matrix.rust }}
+          rustc -vV
+      - name: Run tests
+        run: cargo test
+
+  rustfmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: Install Rust Stable
+        run: |
+          rustup update stable
+          rustup default stable
+          rustup component add rustfmt
+      - name: Run rustfmt
+        run: cargo fmt -- --check
+
+  publish_docs:
+    name: Publish Documentation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: Install Rust Stable
+        run: |
+          rustup update stable
+          rustup default stable
+      - name: Build documentation
+        run: cargo doc --no-deps
+      - name: Publish documentation
+        run: |
+          cd target/doc
+          git init
+          git add .
+          git -c user.name='ci' -c user.email='ci' commit -m init
+          git push -f -q https://git:${{ secrets.github_token }}@github.com/${{ github.repository }} HEAD:gh-pages
+        if: github.event_name == 'push' && github.event.ref == 'refs/heads/master'
diff --git a/cfg-if/.gitignore b/cfg-if/.gitignore
new file mode 100644
index 0000000..a9d37c5
--- /dev/null
+++ b/cfg-if/.gitignore
@@ -0,0 +1,2 @@
+target
+Cargo.lock
diff --git a/cfg-if/Cargo.toml b/cfg-if/Cargo.toml
new file mode 100644
index 0000000..01bd1a7
--- /dev/null
+++ b/cfg-if/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "cfg-if"
+version = "0.1.10"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+license = "MIT/Apache-2.0"
+readme = "README.md"
+repository = "https://github.com/alexcrichton/cfg-if"
+homepage = "https://github.com/alexcrichton/cfg-if"
+documentation = "https://docs.rs/cfg-if"
+description = """
+A macro to ergonomically define an item depending on a large number of #[cfg]
+parameters. Structured like an if-else chain, the first matching branch is the
+item that gets emitted.
+"""
+edition = "2018"
+
+[badges]
+travis-ci = { repository = "alexcrichton/cfg-if" }
+
+[dependencies]
+core = { version = "1.0.0", optional = true, package = 'rustc-std-workspace-core' }
+compiler_builtins = { version = '0.1.2', optional = true }
+
+[features]
+rustc-dep-of-std = ['core', 'compiler_builtins']
diff --git a/cfg-if/LICENSE-APACHE b/cfg-if/LICENSE-APACHE
new file mode 100644
index 0000000..16fe87b
--- /dev/null
+++ b/cfg-if/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
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+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+Copyright [yyyy] [name of copyright owner]
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+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
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diff --git a/cfg-if/LICENSE-MIT b/cfg-if/LICENSE-MIT
new file mode 100644
index 0000000..39e0ed6
--- /dev/null
+++ b/cfg-if/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2014 Alex Crichton
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
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+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/cfg-if/README.md b/cfg-if/README.md
new file mode 100644
index 0000000..50b5e3b
--- /dev/null
+++ b/cfg-if/README.md
@@ -0,0 +1,47 @@
+# cfg-if
+
+[Documentation](https://docs.rs/cfg-if)
+
+A macro to ergonomically define an item depending on a large number of #[cfg]
+parameters. Structured like an if-else chain, the first matching branch is the
+item that gets emitted.
+
+```toml
+[dependencies]
+cfg-if = "0.1"
+```
+
+## Example
+
+```rust
+cfg_if::cfg_if! {
+    if #[cfg(unix)] {
+        fn foo() { /* unix specific functionality */ }
+    } else if #[cfg(target_pointer_width = "32")] {
+        fn foo() { /* non-unix, 32-bit functionality */ }
+    } else {
+        fn foo() { /* fallback implementation */ }
+    }
+}
+
+fn main() {
+    foo();
+}
+```
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in `cfg-if` by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
diff --git a/cfg-if/src/lib.rs b/cfg-if/src/lib.rs
new file mode 100644
index 0000000..6c5058d
--- /dev/null
+++ b/cfg-if/src/lib.rs
@@ -0,0 +1,176 @@
+//! A macro for defining `#[cfg]` if-else statements.
+//!
+//! The macro provided by this crate, `cfg_if`, is similar to the `if/elif` C
+//! preprocessor macro by allowing definition of a cascade of `#[cfg]` cases,
+//! emitting the implementation which matches first.
+//!
+//! This allows you to conveniently provide a long list `#[cfg]`'d blocks of code
+//! without having to rewrite each clause multiple times.
+//!
+//! # Example
+//!
+//! ```
+//! cfg_if::cfg_if! {
+//!     if #[cfg(unix)] {
+//!         fn foo() { /* unix specific functionality */ }
+//!     } else if #[cfg(target_pointer_width = "32")] {
+//!         fn foo() { /* non-unix, 32-bit functionality */ }
+//!     } else {
+//!         fn foo() { /* fallback implementation */ }
+//!     }
+//! }
+//!
+//! # fn main() {}
+//! ```
+
+#![no_std]
+#![doc(html_root_url = "https://docs.rs/cfg-if")]
+#![deny(missing_docs)]
+#![cfg_attr(test, deny(warnings))]
+
+/// The main macro provided by this crate. See crate documentation for more
+/// information.
+#[macro_export]
+macro_rules! cfg_if {
+    // match if/else chains with a final `else`
+    ($(
+        if #[cfg($($meta:meta),*)] { $($tokens:tt)* }
+    ) else * else {
+        $($tokens2:tt)*
+    }) => {
+        $crate::cfg_if! {
+            @__items
+            () ;
+            $( ( ($($meta),*) ($($tokens)*) ), )*
+            ( () ($($tokens2)*) ),
+        }
+    };
+
+    // match if/else chains lacking a final `else`
+    (
+        if #[cfg($($i_met:meta),*)] { $($i_tokens:tt)* }
+        $(
+            else if #[cfg($($e_met:meta),*)] { $($e_tokens:tt)* }
+        )*
+    ) => {
+        $crate::cfg_if! {
+            @__items
+            () ;
+            ( ($($i_met),*) ($($i_tokens)*) ),
+            $( ( ($($e_met),*) ($($e_tokens)*) ), )*
+            ( () () ),
+        }
+    };
+
+    // Internal and recursive macro to emit all the items
+    //
+    // Collects all the negated cfgs in a list at the beginning and after the
+    // semicolon is all the remaining items
+    (@__items ($($not:meta,)*) ; ) => {};
+    (@__items ($($not:meta,)*) ; ( ($($m:meta),*) ($($tokens:tt)*) ), $($rest:tt)*) => {
+        // Emit all items within one block, applying an appropriate #[cfg]. The
+        // #[cfg] will require all `$m` matchers specified and must also negate
+        // all previous matchers.
+        #[cfg(all($($m,)* not(any($($not),*))))] $crate::cfg_if! { @__identity $($tokens)* }
+
+        // Recurse to emit all other items in `$rest`, and when we do so add all
+        // our `$m` matchers to the list of `$not` matchers as future emissions
+        // will have to negate everything we just matched as well.
+        $crate::cfg_if! { @__items ($($not,)* $($m,)*) ; $($rest)* }
+    };
+
+    // Internal macro to make __apply work out right for different match types,
+    // because of how macros matching/expand stuff.
+    (@__identity $($tokens:tt)*) => {
+        $($tokens)*
+    };
+}
+
+#[cfg(test)]
+mod tests {
+    cfg_if! {
+        if #[cfg(test)] {
+            use core::option::Option as Option2;
+            fn works1() -> Option2<u32> { Some(1) }
+        } else {
+            fn works1() -> Option<u32> { None }
+        }
+    }
+
+    cfg_if! {
+        if #[cfg(foo)] {
+            fn works2() -> bool { false }
+        } else if #[cfg(test)] {
+            fn works2() -> bool { true }
+        } else {
+            fn works2() -> bool { false }
+        }
+    }
+
+    cfg_if! {
+        if #[cfg(foo)] {
+            fn works3() -> bool { false }
+        } else {
+            fn works3() -> bool { true }
+        }
+    }
+
+    cfg_if! {
+        if #[cfg(test)] {
+            use core::option::Option as Option3;
+            fn works4() -> Option3<u32> { Some(1) }
+        }
+    }
+
+    cfg_if! {
+        if #[cfg(foo)] {
+            fn works5() -> bool { false }
+        } else if #[cfg(test)] {
+            fn works5() -> bool { true }
+        }
+    }
+
+    #[test]
+    fn it_works() {
+        assert!(works1().is_some());
+        assert!(works2());
+        assert!(works3());
+        assert!(works4().is_some());
+        assert!(works5());
+    }
+
+    #[test]
+    #[allow(clippy::assertions_on_constants)]
+    fn test_usage_within_a_function() {
+        cfg_if! {if #[cfg(debug_assertions)] {
+            // we want to put more than one thing here to make sure that they
+            // all get configured properly.
+            assert!(cfg!(debug_assertions));
+            assert_eq!(4, 2+2);
+        } else {
+            assert!(works1().is_some());
+            assert_eq!(10, 5+5);
+        }}
+    }
+
+    trait Trait {
+        fn blah(&self);
+    }
+
+    #[allow(dead_code)]
+    struct Struct;
+
+    impl Trait for Struct {
+        cfg_if! {
+            if #[cfg(feature = "blah")] {
+                fn blah(&self) {
+                    unimplemented!();
+                }
+            } else {
+                fn blah(&self) {
+                    unimplemented!();
+                }
+            }
+        }
+    }
+}
diff --git a/cfg-if/tests/xcrate.rs b/cfg-if/tests/xcrate.rs
new file mode 100644
index 0000000..e7b4a36
--- /dev/null
+++ b/cfg-if/tests/xcrate.rs
@@ -0,0 +1,14 @@
+cfg_if::cfg_if! {
+    if #[cfg(foo)] {
+        fn works() -> bool { false }
+    } else if #[cfg(test)] {
+        fn works() -> bool { true }
+    } else {
+        fn works() -> bool { false }
+    }
+}
+
+#[test]
+fn smoke() {
+    assert!(works());
+}