Remove fuchsia-cprng dependancy

Also, reenable fuchsia building

Author: josephlr

.travis.yml

@@ -102,7 +102,7 @@ matrix:
         - rustup target add x86_64-sun-solaris
         - rustup target add x86_64-unknown-cloudabi
         - rustup target add x86_64-unknown-freebsd
-        #- rustup target add x86_64-unknown-fuchsia
+        - rustup target add x86_64-fuchsia
         - rustup target add x86_64-unknown-netbsd
         - rustup target add x86_64-unknown-redox
         - rustup target add x86_64-fortanix-unknown-sgx
@@ -113,7 +113,7 @@ matrix:
         - cargo build --target=x86_64-sun-solaris --all-features
         - cargo build --target=x86_64-unknown-cloudabi --all-features
         - cargo build --target=x86_64-unknown-freebsd --all-features
-        #- cargo build --target=x86_64-unknown-fuchsia --all-features
+        - cargo build --target=x86_64-fuchsia --all-features
         - cargo build --target=x86_64-unknown-netbsd --all-features
         - cargo build --target=x86_64-unknown-redox --all-features
         - cargo build --target=x86_64-fortanix-unknown-sgx --all-features
@@ -123,7 +123,7 @@ matrix:
         - cargo build --target=x86_64-sun-solaris --all-features
         - cargo build --target=x86_64-unknown-cloudabi --all-features
         - cargo build --target=x86_64-unknown-freebsd --all-features
-        #- cargo build --target=x86_64-unknown-fuchsia --all-features
+        - cargo build --target=x86_64-fuchsia --all-features
         - cargo build --target=x86_64-unknown-netbsd --all-features
         - cargo build --target=x86_64-unknown-redox --all-features
         - cargo build --target=x86_64-fortanix-unknown-sgx --all-features

Cargo.toml

@@ -26,9 +26,6 @@ libc = "0.2.54"
 [target.'cfg(unix)'.dependencies]
 lazy_static = "1.3.0"
 
-[target.'cfg(fuchsia)'.dependencies]
-fuchsia-cprng = "0.1"
-
 [target.'cfg(target_os = "redox")'.dependencies]
 lazy_static = "1.3.0"
 

src/fuchsia.rs

@@ -10,8 +10,13 @@
 use crate::Error;
 use core::num::NonZeroU32;
 
+#[link(name = "zircon")]
+extern "C" {
+    fn zx_cprng_draw(buffer: *mut u8, length: usize);
+}
+
 pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
-    fuchsia_cprng::cprng_draw(dest);
+    unsafe { zx_cprng_draw(dest.as_mut_ptr(), dest.len()) }
     Ok(())
 }
 

src/lib.rs

@@ -107,7 +107,7 @@
 //! [8]: https://leaf.dragonflybsd.org/cgi/web-man?command=random&section=4
 //! [9]: https://docs.oracle.com/cd/E88353_01/html/E37841/getrandom-2.html
 //! [10]: https://docs.oracle.com/cd/E86824_01/html/E54777/random-7d.html
-//! [11]: https://fuchsia.googlesource.com/zircon/+/HEAD/docs/syscalls/cprng_draw.md
+//! [11]: https://fuchsia.googlesource.com/fuchsia/+/master/zircon/docs/syscalls/cprng_draw.md
 //! [12]: https://github.com/redox-os/randd/blob/master/src/main.rs
 //! [13]: https://github.com/nuxinl/cloudabi#random_get
 //! [14]: https://www.w3.org/TR/WebCryptoAPI/#Crypto-method-getRandomValues