From 252c90732709447ad33bbf329fc47d584cd23f37 Mon Sep 17 00:00:00 2001 From: Alex Funo Date: Wed, 9 Jul 2025 20:18:22 +0700 Subject: kernel: dev: Add /dev/random Introduce a prototype cryptographically secure (?) random number generator. The RNG uses ChaCha20 seeded with a SipHash-processed entropy pool. Entropy is collected only at read time and is mixed into the internal pool before each ChaCha20 reseed. The design is still experimental. Signed-off-by: Alex Funo Signed-off-by: Ian Moffett --- sys/include/dev/random/chacha20.h | 47 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 sys/include/dev/random/chacha20.h (limited to 'sys/include/dev/random/chacha20.h') diff --git a/sys/include/dev/random/chacha20.h b/sys/include/dev/random/chacha20.h new file mode 100644 index 0000000..d35702a --- /dev/null +++ b/sys/include/dev/random/chacha20.h @@ -0,0 +1,47 @@ +/* + * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Hyra nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include +#include +#include + +#define ROTL(a,b) (((a) << (b)) | ((a) >> (32 - (b)))) + +#define QR(a,b,c,d) \ + a += b; d ^= a; d = ROTL(d, 16); \ + c += d; b ^= c; b = ROTL(b, 12); \ + a += b; d ^= a; d = ROTL(d, 8); \ + c += d; b ^= c; b = ROTL(b, 7); + +void chacha20_init(uint32_t state[16], const uint8_t key[32], + const uint8_t nonce[12], uint32_t counter); + +void chacha20_block(uint32_t state[16], uint8_t out[64]); +void chacha20_encrypt(uint32_t state[16], uint8_t *in, uint8_t *out, size_t len); + -- cgit v1.2.3