1 files changed, 0 insertions, 90 deletions
diff --git a/getrandom/src/rdrand.rs b/getrandom/src/rdrand.rs
deleted file mode 100644
index e441682..0000000
--- a/getrandom/src/rdrand.rs
+++ /dev/null
@@ -1,90 +0,0 @@
-// Copyright 2018 Developers of the Rand project.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! Implementation for SGX using RDRAND instruction
-use crate::error::{FAILED_RDRAND, NO_RDRAND};
-#[cfg(not(target_feature = "rdrand"))]
-use crate::util::LazyBool;
-use crate::Error;
-use core::arch::x86_64::_rdrand64_step;
-use core::mem;
-
-// Recommendation from "Intel® Digital Random Number Generator (DRNG) Software
-// Implementation Guide" - Section 5.2.1 and "Intel® 64 and IA-32 Architectures
-// Software Developer’s Manual" - Volume 1 - Section 7.3.17.1.
-const RETRY_LIMIT: usize = 10;
-const WORD_SIZE: usize = mem::size_of::<u64>();
-
-#[target_feature(enable = "rdrand")]
-unsafe fn rdrand() -> Result<[u8; WORD_SIZE], Error> {
-    for _ in 0..RETRY_LIMIT {
-        let mut el = mem::zeroed();
-        if _rdrand64_step(&mut el) == 1 {
-            // AMD CPUs from families 14h to 16h (pre Ryzen) sometimes fail to
-            // set CF on bogus random data, so we check these values explicitly.
-            // See https://github.com/systemd/systemd/issues/11810#issuecomment-489727505
-            // We perform this check regardless of target to guard against
-            // any implementation that incorrectly fails to set CF.
-            if el != 0 && el != !0 {
-                return Ok(el.to_ne_bytes());
-            }
-            error!("RDRAND returned {:X}, CPU RNG may be broken", el);
-            // Keep looping in case this was a false positive.
-        }
-    }
-    Err(FAILED_RDRAND)
-}
-
-// "rdrand" target feature requires "+rdrnd" flag, see https://github.com/rust-lang/rust/issues/49653.
-#[cfg(all(target_env = "sgx", not(target_feature = "rdrand")))]
-compile_error!(
-    "SGX targets require 'rdrand' target feature. Enable by using -C target-feature=+rdrnd."
-);
-
-#[cfg(target_feature = "rdrand")]
-fn is_rdrand_supported() -> bool {
-    true
-}
-
-// TODO use is_x86_feature_detected!("rdrand") when that works in core. See:
-// https://github.com/rust-lang-nursery/stdsimd/issues/464
-#[cfg(not(target_feature = "rdrand"))]
-fn is_rdrand_supported() -> bool {
-    use core::arch::x86_64::__cpuid;
-    // SAFETY: All x86_64 CPUs support CPUID leaf 1
-    const FLAG: u32 = 1 << 30;
-    static HAS_RDRAND: LazyBool = LazyBool::new();
-    HAS_RDRAND.unsync_init(|| unsafe { (__cpuid(1).ecx & FLAG) != 0 })
-}
-
-pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
-    if !is_rdrand_supported() {
-        return Err(NO_RDRAND);
-    }
-
-    // SAFETY: After this point, rdrand is supported, so calling the rdrand
-    // functions is not undefined behavior.
-    unsafe { rdrand_exact(dest) }
-}
-
-#[target_feature(enable = "rdrand")]
-unsafe fn rdrand_exact(dest: &mut [u8]) -> Result<(), Error> {
-    // We use chunks_exact_mut instead of chunks_mut as it allows almost all
-    // calls to memcpy to be elided by the compiler.
-    let mut chunks = dest.chunks_exact_mut(WORD_SIZE);
-    for chunk in chunks.by_ref() {
-        chunk.copy_from_slice(&rdrand()?);
-    }
-
-    let tail = chunks.into_remainder();
-    let n = tail.len();
-    if n > 0 {
-        tail.copy_from_slice(&rdrand()?[..n]);
-    }
-    Ok(())
-}