getrandom

Added

• wasm64-unknown-unknown target support for wasm_js backend #848

Changed

• Drop wasip2 and wasip3 dependencies in favor of manual bindings
  #830

Added

• wasm64-unknown-unknown target support for wasm_js backend #848

Changed

• Drop wasip2 and wasip3 dependencies in favor of manual bindings #830

Changed

• Bump r-efi dependency to v6 #814

Fixed

• Read errno only when it is set #810
• Check the return value of ProcessPrng on Windows #811

Changed

• Bump r-efi dependency to v6 #814

Fixed

• Read errno only when it is set #810
• Check the return value of ProcessPrng on Windows #811

Fixed

• Documentation build on docs.rs #801

Fixed

• Documentation build on docs.rs #801

Prepare v0.4.0 release (#798)

Added

• RawOsError type alias #739
• SysRng behind new feature sys_rng #751
• WASIp3 support #779
• extern_impl opt-in backend #786 #794
• Motor OS support #797

Changed

• Use Edition 2024 and MSRV 1.85 #749

• Renames (Try)RngCore => (Try)Rng
• Replace use of unwrap_err in example with UnwrapErr

Prepare v0.4.0-rc.0 (#769)

Forgot this because I'm out of practice.

Signed-off-by: Joe Richey [email protected]

Major change to wasm_js backend

Now, when the wasm_js feature is enabled, the wasm_js backend will be used by default. Users of wasm32-unknown-unknown targeting JavaScript environments like the Web and Node.js will no longer need to specify:

--cfg getrandom_backend="wasm_js"

in RUSTFLAGS for the crate to compile. They can now simple enable a feature.

Note: this should not affect non-JS users of the wasm32-unknown-unknown target. Using --cfg getrandom_backend will still override the source of randomness even if the wasm_js feature is enabled. This includes --cfg getrandom_backend=custom and --cfg getrandom_backend=unsupported.

For more information, see the discussions in #671, #675, and #730.

Added

• unsupported opt-in backend #667
• windows_legacy opt-in backend #724

Changed

• Implement Memory Sanitizer unpoisoning more precisely #678
• Relax MSRV for the linux_raw opt-in backend on ARM targets #688
• Use getrandom syscall on all RISC-V Linux targets #699
• Replaced wasi dependency with wasip2 #721
• Enable wasm_js backend by default if the wasm_js feature is enabled #730

Removed

• Unstable rustc-dep-of-std crate feature #694

chore: Release getrandom version 0.3.3

Changed

• Doc improvements #632 #634 #635
• Add crate version to docs.rs links used in compile_error!s #639

Fixed

• Error handling in WASI p1 #661

Added

• efi_rng opt-in backend #570
• linux_raw opt-in backend #572
• .cargo/config.toml example in the crate-level docs #591
• getrandom_test_linux_without_fallback configuration flag to test that file fallback is not triggered in the linux_android_with_fallback backend #605
• Built-in support for *-linux-none targets #618
• Cygwin support #626

Changed

• Update wasi dependency to v0.14 #594
• Add #[inline] attribute to the inner functions #596
• Update WASI and Emscripten links in the crate-level docs #597
• Do not use dlsym on MUSL targets in the linux_android_with_fallback backend #602
• Remove linux_android.rs and use getrandom.rs instead #603
• Always use RtlGenRandom on Windows targets when compiling with pre-1.78 Rust #610
• Internal representation of the Error type #614
• Remove windows-targets dependency and use raw-dylib directly #627

Removed

• Error::INTERNAL_START and Error::CUSTOM_START associated constants #614

Fixed

• Build error on Android #588

Breaking Changes

Changed

• Bump MSRV to 1.63 #542
• Rename getrandom and getrandom_uninit functions to fill and fill_uninit respectively #532

Removed

• wasm32-wasi target support (use wasm32-wasip1 or wasm32-wasip2 instead) #499
• linux_disable_fallback, rdrand, js, test-in-browser, and custom crate features in favor of configuration flags #504
• register_custom_getrandom! macro #504
• Implementation of From<NonZeroU32> for Error and Error::code method #507
• Internet Explorer 11 support #554
• Target-specific associated Error constants #562

Changed

• Use ProcessPrng on Windows 10 and up, and use RtlGenRandom on older Windows versions #415
• Do not use locale-specific strerror_r for retrieving error code descriptions #440
• Avoid assuming usize is the native word size in the rdrand backend #442
• Do not read from errno when libc did not indicate error on Solaris #448
• Switch from libpthread's mutex to futex on Linux and to nanosleep-based wait loop on other targets in the use_file backend #490
• Do not retry on EAGAIN while polling /dev/random on Linux #522
• Remove separate codepath for Node.js in the wasm_js backend (bumps minimum supported Node.js version to v19) #557
• Use js_namespace in the wasm_js backend #559

Added

• wasm32-wasip1 and wasm32-wasip2 support #499
• getrandom_backend configuration flag for selection of opt-in backends #504
• Error::new_custom method #507
• rndr opt-in backend #512
• Automatic MemorySanitizer support #521 #571
• u32 and u64 functions for generating random values of the respective type #544
• wasm32v1-none support in the wasm_js backend #560
• wasm_js crate feature which allows users to enable the wasm_js opt-in backend #574

Fixed

• NetBSD fallback code based on KERN_ARND #555

Release 0.2.17 (#774)

Fixed

• Use doc_cfg instead of doc_auto_cfg (partial backport of #732) #768
• BCryptGenRandom signature #778

0.2.16 - 2025-04-22

Added

• Cygwin support (backport of #626) #654

Added

• Cygwin support (backport of [#626]) #654

Added

• Apple visionOS support #410

Changed

• Use libc::getrandom on DragonflyBSD, FreeBSD, illumos, and Solaris #411 #416 #417 #420
• Unify libc::getentropy-based implementations #418

Fixed

• Enable /dev/urandom fallback for MUSL-based Linux targets #408

Added

• linux_disable_fallback crate feature to disable /dev/urandom-based fallback on Linux and Android targets. Enabling this feature bumps minimum supported Linux kernel version to 3.17 and Android API level to 23 (Marshmallow). #396

Changed

• Disable /dev/urandom fallback for Linux targets outside of the following target_arches: aarch64, arm, powerpc, powerpc64, s390x, x86, x86_64 #396
• Do not catch EPERM error code on Android while checking availability of the getrandom syscall #396

Fixed

• Custom backend for targets without atomics #385

Changed

• Improve robustness of the Hermit backend and sys_fill_exact #386
• Raise minimum supported Apple OS versions to macOS 10.12 and iOS 10 #388

Added

• Document platform support policy #387

Added

• GNU/Hurd support #370

Changed

• Renamed __getrandom_internal to __GETRANDOM_INTERNAL #369
• Updated link to Hermit docs #374

Added

• Support for PS Vita (armv7-sony-vita-newlibeabihf) #359

Changed

• Use getentropy from libc on Emscripten targets #362

Added

• AIX support #282
• getrandom_uninit function #291
• wasm64-unknown-unknown support #303
• tvOS and watchOS support #317
• QNX/nto support #325
• Support for getrandom syscall on NetBSD ≥ 10.0 #331
• RtlGenRandom fallback for non-UWP Windows #337

Breaking Changes

• Update MSRV to 1.36 #291

Fixed

• Solaris/OpenBSD/Dragonfly build #301

Changed

• Update MSRV to 1.36 #291
• Use getentropy on Emscripten #307
• Solaris: consistently use /dev/random source #310
• Move 3ds selection above rdrand/js/custom fallback #312
• Remove buffer zeroing from Node.js implementation #315
• Use open instead of open64 #326
• Remove #cfg from bsd_arandom.rs #332
• Hermit: use sys_read_entropy syscall #333
• Eliminate potential panic in sys_fill_exact #334
• rdrand: Remove checking for 0 and !0 and instead check CPU family and do a self-test #335
• Move __getrandom_custom definition into a const block #344
• Switch the custom backend to Rust ABI #347

Changed

• The Web Cryptography API will now be preferred on wasm32-unknown-unknown when using the "js" feature, even on Node.js #284 #295

Added

• Added benchmarks to track buffer initialization cost #272

Fixed

• Use $crate in register_custom_getrandom! #270

Documentation

• Add information about enabling "js" feature #280
• Fix link to wasm-bindgen #278
• Document the varied implementations for underlying randomness sources #276

Changed

• Update wasi dependency to 0.11 #253

Fixed

• Use AtomicPtr instead of AtomicUsize for Strict Provenance compatibility. #263

Documentation

• Add comments explaining use of fallback mechanisms #257 #260

Added

• Nintendo 3DS (armv6k-nintendo-3ds) support #248

Changed

• Retry open when interrupted #252

Added

• ESP-IDF targets (*‑espidf) support #245

Fixed

• Webpack warning caused by dynamic require #234
• Error checking on iOS for SecRandomCopyBytes #244

Changed

• Use explicit imports in the js backend #220
• Use /dev/urandom on Redox instead of rand: #222
• Use NonZeroU32::new_unchecked to convert wasi error #233

Added

• SOLID targets (*-kmc-solid_*) support #235
• Limited Hermit (x86_64-unknown-hermit) support #236

Changed

• Replace build.rs with link attributes. #205
• Add support for getrandom syscall on DragonFly BSD. #210
• Improve Node.js detection. #215

Changed

• Forward rustc-dep-of-std to dependencies. #198
• Highlight feature-dependent functionality in documentation using the doc_cfg feature. #200

Changed

• Update cfg-if to v1.0. #166
• Update wasi to v0.10. #167

Fixed

• Multithreaded WASM support. #165

Removed

• Windows XP support. #177
• Direct stdweb support. #178
• CloudABI support. #184

Features for using getrandom on unsupported targets

The following (off by default) Cargo features have been added:

• "rdrand" - use the RDRAND instruction on no_std x86/x86_64 targets #133
• "js" - use JavaScript calls on wasm32-unknown-unknown #149
  • Replaces the stdweb and wasm-bindgen features (which are removed)
• "custom" - allows a user to specify a custom implementation #109

Breaking Changes

• Unsupported targets no longer compile #107
• Change/Add Error constants #120
• Only impl std traits when the "std" Cargo feature is specified #106
• Remove official support for Hermit, L4Re, and UEFI #133
• Remove optional "log" dependency #131
• Update minimum supported Linux kernel to 2.6.32 #153
• Update MSRV to 1.34 #159

Changed

• Update cfg-if to v1.0. #173
• Implement std::error::Error for the Error type on additional targets. #169

Fixed

• Multithreaded WASM support. #171

Changed

• Added support for Internet Explorer 11 #139
• Fix Webpack require warning with wasm-bindgen #137

Changed

• Remove use of spin-locks in the use_file module. #125
• Update wasi to v0.9. #126
• Do not read errno value on DragonFlyBSD to fix compilation failure. #129

Added

• VxWorks targets support. #86

Changed

• If zero-length slice is passed to the getrandom function, always return Ok(()) immediately without doing any calls to the underlying operating system. #104
• Use the kern.arandom sysctl on NetBSD. #115

Fixed

• Bump cfg-if minimum version from 0.1.0 to 0.1.2. #112
• Typos and bad doc links. #117

Changed

• Update wasi dependency from v0.5 to v0.7. #100

Fixed

• Implement std-dependent traits for selected targets even if std feature is disabled. (backward compatibility with v0.1.8) #96

Changed

• Use the dummy implementation on wasm32-unknown-unknown even with the disabled dummy feature. #90

Fixed

• Fix CSP error for wasm-bindgen. #92

Changed

• Remove std dependency for opening and reading files. #58
• Use wasi instead of libc on WASI target. #64
• By default emit a compile-time error when built for an unsupported target. This behaviour can be disabled by using the dummy feature. #71

Added

• Add support for UWP targets. #69
• Add unstable rustc-dep-of-std feature. #78

Changed

• Explicitly specify types to arguments of 'libc::syscall'. #74

Added

• Support for hermit and l4re. #61
• Error::raw_os_error method, Error::INTERNAL_START and Error::CUSTOM_START constants. Use libc for retrieving OS error descriptions. #54

Changed

• Remove lazy_static dependency and use custom structures for lock-free initialization. #51 #52
• Try getrandom() first on FreeBSD. #57

Removed

• Bitrig support. #56

Deprecated

• Error::UNKNOWN, Error::UNAVAILABLE. #54

Changed

• Minor change of RDRAND AMD bug handling. #48

Fixed

• Use shared File instead of shared file descriptor. #44
• Workaround for RDRAND hardware bug present on some AMD CPUs. #43

Changed

• Try getentropy and then fallback to /dev/random on macOS. #38

Added

• Add support for x86_64-unknown-uefi target by using RDRAND with CPUID feature detection. #30

Fixed

• Fix long buffer issues on Windows and Linux. #31 #32
• Check EPERM in addition to ENOSYS on Linux. #37

Changed

• Improve efficiency by sharing file descriptor across threads. #13
• Remove cloudabi, winapi, and fuchsia-cprng dependencies. #40
• Improve RDRAND implementation. #24
• Don't block during syscall detection on Linux. #26
• Increase consistency with libc implementation on FreeBSD. #36
• Apply rustfmt. #39

• Update for wasm32-unknown-wasi being renamed to wasm32-wasi, and for WASI being categorized as an OS.

• Add support for wasm32-unknown-wasi target.

• Enable std functionality for CloudABI by default.

Publish initial implementation.

Publish an empty template library.