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013efaf139
std.crypto.random * cross platform, even freestanding * can't fail. on initialization for some systems requires calling os.getrandom(), in which case there are rare but theoretically possible errors. The code panics in these cases, however the application may choose to override the default seed function and then handle the failure another way. * thread-safe * supports the full Random interface * cryptographically secure * no syscall required to initialize on Linux (AT_RANDOM) * calls arc4random on systems that support it `std.crypto.randomBytes` is removed in favor of `std.crypto.random.bytes`. I moved some of the Random implementations into their own files in the interest of organization. stage2 no longer requires passing a RNG; instead it uses this API. Closes #6704
41 lines
1.2 KiB
Zig
41 lines
1.2 KiB
Zig
// SPDX-License-Identifier: MIT
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// Copyright (c) 2015-2020 Zig Contributors
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// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
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// The MIT license requires this copyright notice to be included in all copies
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// and substantial portions of the software.
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//! CSPRNG
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const std = @import("std");
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const Random = std.rand.Random;
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const mem = std.mem;
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const Gimli = @This();
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random: Random,
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state: std.crypto.core.Gimli,
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pub const secret_seed_length = 32;
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/// The seed must be uniform, secret and `secret_seed_length` bytes long.
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pub fn init(secret_seed: [secret_seed_length]u8) Gimli {
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var initial_state: [std.crypto.core.Gimli.BLOCKBYTES]u8 = undefined;
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mem.copy(u8, initial_state[0..secret_seed_length], &secret_seed);
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mem.set(u8, initial_state[secret_seed_length..], 0);
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var self = Gimli{
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.random = Random{ .fillFn = fill },
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.state = std.crypto.core.Gimli.init(initial_state),
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};
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return self;
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}
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fn fill(r: *Random, buf: []u8) void {
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const self = @fieldParentPtr(Gimli, "random", r);
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if (buf.len != 0) {
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self.state.squeeze(buf);
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} else {
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self.state.permute();
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}
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mem.set(u8, self.state.toSlice()[0..std.crypto.core.Gimli.RATE], 0);
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}
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