libsodium-sys is already good enough to depend

.travis.yml

@@ -33,17 +33,5 @@ install:
     export OPENSSL_DIR=/c/OpenSSL/bin;
     fi
 
-  # Install libsodium on Windows
-  - if [ "#{TRAVIS_OS_NAME}" = "windows" ]; then
-    curl -O "https://download.libsodium.org/libsodium/releases/libsodium-1.0.18-stable-mingw.tar.gz";
-    mkdir -p "/c/libsodium";
-    tar -xf libsodium-1.0.18-stable-mingw.tar.gz -C "/c/libsodium";
-    export SODIUM_INCLUDE_DIR=/c/libsodium/libsodium-win64/include;
-    export SODIUM_LIB_DIR=/c/libsodium/libsodium-win64/lib;
-    export SODIUM_STATIC=yes;
-    else
-    export SODIUM_BUILD_STATIC=yes;
-    fi
-
 script:
   - cargo test --no-fail-fast --features miscreant

Cargo.toml

@@ -33,7 +33,7 @@ lto = true
 
 [features]
 default = ["sodium", "rc4", "aes-cfb", "aes-ctr", "trust-dns"]
-sodium = ["libsodium-ffi"]
+sodium = ["libsodium-sys"]
 rc4 = ["openssl"]
 aes-cfb = ["openssl"]
 aes-ctr = ["openssl"]
@@ -64,7 +64,7 @@ serde_urlencoded = "0.6"
 serde = { version = "1.0", features = ["derive"] }
 url = "2.1"
 byte_string = "1.0"
-libsodium-ffi = { version = "0.2", optional = true }
+libsodium-sys = { version = "0.2", optional = true }
 miscreant = { version = "0.4", optional = true }
 trust-dns-resolver = { version = "0.18.0-alpha", features = ["dns-over-rustls", "dns-over-https-rustls"], optional = true }
 hkdf = "0.8"

appveyor.yml

@@ -1,19 +1,18 @@
 environment:
-    SSL_CERT_FILE: "C:\\OpenSSL\\cacert.pem"
+  SSL_CERT_FILE: "C:\\OpenSSL\\cacert.pem"
 
-    matrix:
-        - TARGET: x86_64-pc-windows-msvc
-          BITS: 64
-          MSYS2: 1
-          OPENSSL_DIR: C:\OpenSSL-Win64
-          SODIUM_BUILD_STATIC: yes
-          RUST_BACKTRACE: 1
-      # - TARGET: i686-pc-windows-gnu
-      #   BITS: 32
-      #   OPENSSL_DIR: C:\OpenSSL-Win32
-      #   MSYS2: 1
-      #   SODIUM_BUILD_STATIC: yes
-      #   RUST_BACKTRACE: 1
+  matrix:
+    - TARGET: x86_64-pc-windows-msvc
+      BITS: 64
+      MSYS2: 1
+      OPENSSL_DIR: C:\OpenSSL-Win64
+      RUST_BACKTRACE: 1
+    # - TARGET: i686-pc-windows-gnu
+    #   BITS: 32
+    #   OPENSSL_DIR: C:\OpenSSL-Win32
+    #   MSYS2: 1
+    #   SODIUM_BUILD_STATIC: yes
+    #   RUST_BACKTRACE: 1
 install:
   # Install Rust
   - appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
@@ -28,8 +27,8 @@ install:
 build: false
 
 test_script:
-    - cargo test --no-fail-fast
+  - cargo test --no-fail-fast
 
 cache:
-    - target
-    - C:\Users\appveyor\.cargo\registry
+  - target
+  - C:\Users\appveyor\.cargo\registry

build/Dockerfile.x86_64-pc-windows-gnu

@@ -29,8 +29,6 @@ ENV OPENSSL_DIR=/usr/x86_64-w64-mingw32 \
     OPENSSL_LIB_DIR=/usr/x86_64-w64-mingw32/lib \
     OPENSSL_STATIC=1 \
     OPENSSL_LIBS=ssl:crypto \
-    SODIUM_BUILD_INCLUDE_DIR=/usr/x86_64-w64-mingw32/include \
-    SODIUM_STATIC=1 \
     PKG_CONFIG_ALLOW_CROSS=true \
     PKG_CONFIG_ALL_STATIC=true \
     PKG_CONFIG_PATH=/usr/x86_64-w64-mingw32/lib/pkgconfig \

build/Dockerfile.x86_64-unknown-linux-musl

@@ -27,8 +27,6 @@ ENV OPENSSL_DIR=/usr/local/musl \
     OPENSSL_INCLUDE_DIR=/usr/local/musl/include \
     OPENSSL_LIB_DIR=/usr/local/musl/lib \
     OPENSSL_STATIC=1 \
-    SODIUM_BUILD_INCLUDE_DIR=/usr/local/x86_64-linux-musl/include \
-    SODIUM_STATIC=1 \
     PKG_CONFIG_ALLOW_CROSS=true \
     PKG_CONFIG_ALL_STATIC=true \
     PKG_CONFIG_PATH=/usr/local/musl/lib/pkgconfig \

src/crypto/aead.rs

@@ -128,7 +128,7 @@ pub fn make_skey(t: CipherType, key: &[u8], salt: &[u8]) -> Bytes {
 /// AEAD ciphers requires to increase nonce after encrypt/decrypt every chunk
 #[cfg(feature = "sodium")]
 pub fn increase_nonce(nonce: &mut [u8]) {
-    use libsodium_ffi::sodium_increment;
+    use libsodium_sys::sodium_increment;
 
     unsafe {
         sodium_increment(nonce.as_mut_ptr(), nonce.len());

src/crypto/sodium.rs

@@ -5,7 +5,7 @@ use std::{ptr, sync::Once};
 use bytes::{BufMut, Bytes, BytesMut};
 
 use libc::c_ulonglong;
-use libsodium_ffi::{
+use libsodium_sys::{
     crypto_aead_xchacha20poly1305_ietf_decrypt,
     crypto_aead_xchacha20poly1305_ietf_encrypt,
     crypto_stream_chacha20_ietf_xor_ic,