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72 lines
2.6 KiB
Rust
72 lines
2.6 KiB
Rust
//! RDRAND and RDSEED instructions for returning random numbers from an Intel
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//! on-chip hardware random number generator which has been seeded by an
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//! on-chip entropy source.
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extern "platform-intrinsic" {
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fn x86_rdrand16_step() -> (u16, i32);
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fn x86_rdrand32_step() -> (u32, i32);
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fn x86_rdseed16_step() -> (u16, i32);
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fn x86_rdseed32_step() -> (u32, i32);
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}
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#[cfg(test)]
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use stdsimd_test::assert_instr;
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/// Read a hardware generated 16-bit random value and store the result in val.
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/// Return 1 if a random value was generated, and 0 otherwise.
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///
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/// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_rdrand16_step)
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#[inline]
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#[target_feature(enable = "rdrand")]
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#[cfg_attr(test, assert_instr(rdrand))]
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#[cfg_attr(feature = "cargo-clippy", allow(clippy::stutter))]
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#[stable(feature = "simd_x86", since = "1.27.0")]
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pub unsafe fn _rdrand16_step(val: &mut u16) -> i32 {
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let (v, flag) = x86_rdrand16_step();
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*val = v;
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flag
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}
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/// Read a hardware generated 32-bit random value and store the result in val.
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/// Return 1 if a random value was generated, and 0 otherwise.
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///
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/// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_rdrand32_step)
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#[inline]
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#[target_feature(enable = "rdrand")]
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#[cfg_attr(test, assert_instr(rdrand))]
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#[cfg_attr(feature = "cargo-clippy", allow(clippy::stutter))]
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#[stable(feature = "simd_x86", since = "1.27.0")]
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pub unsafe fn _rdrand32_step(val: &mut u32) -> i32 {
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let (v, flag) = x86_rdrand32_step();
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*val = v;
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flag
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}
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/// Read a 16-bit NIST SP800-90B and SP800-90C compliant random value and store
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/// in val. Return 1 if a random value was generated, and 0 otherwise.
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///
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/// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_rdseed16_step)
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#[inline]
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#[target_feature(enable = "rdseed")]
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#[cfg_attr(test, assert_instr(rdseed))]
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#[stable(feature = "simd_x86", since = "1.27.0")]
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pub unsafe fn _rdseed16_step(val: &mut u16) -> i32 {
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let (v, flag) = x86_rdseed16_step();
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*val = v;
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flag
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}
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/// Read a 32-bit NIST SP800-90B and SP800-90C compliant random value and store
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/// in val. Return 1 if a random value was generated, and 0 otherwise.
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///
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/// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_rdseed32_step)
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#[inline]
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#[target_feature(enable = "rdseed")]
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#[cfg_attr(test, assert_instr(rdseed))]
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#[stable(feature = "simd_x86", since = "1.27.0")]
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pub unsafe fn _rdseed32_step(val: &mut u32) -> i32 {
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let (v, flag) = x86_rdseed32_step();
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*val = v;
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flag
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}
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