From dc25573ed79a0d55c5a24b20474aa8504a758a2c Mon Sep 17 00:00:00 2001 From: David Monniaux Date: Sat, 2 Feb 2019 12:03:44 +0100 Subject: BearSSL --- test/monniaux/BearSSL/src/symcipher/chacha20_ct.c | 106 ++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 test/monniaux/BearSSL/src/symcipher/chacha20_ct.c (limited to 'test/monniaux/BearSSL/src/symcipher/chacha20_ct.c') diff --git a/test/monniaux/BearSSL/src/symcipher/chacha20_ct.c b/test/monniaux/BearSSL/src/symcipher/chacha20_ct.c new file mode 100644 index 00000000..9961eb11 --- /dev/null +++ b/test/monniaux/BearSSL/src/symcipher/chacha20_ct.c @@ -0,0 +1,106 @@ +/* + * Copyright (c) 2016 Thomas Pornin + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include "inner.h" + +/* see bearssl_block.h */ +uint32_t +br_chacha20_ct_run(const void *key, + const void *iv, uint32_t cc, void *data, size_t len) +{ + unsigned char *buf; + uint32_t kw[8], ivw[3]; + size_t u; + + static const uint32_t CW[] = { + 0x61707865, 0x3320646e, 0x79622d32, 0x6b206574 + }; + + buf = data; + for (u = 0; u < 8; u ++) { + kw[u] = br_dec32le((const unsigned char *)key + (u << 2)); + } + for (u = 0; u < 3; u ++) { + ivw[u] = br_dec32le((const unsigned char *)iv + (u << 2)); + } + while (len > 0) { + uint32_t state[16]; + int i; + size_t clen; + unsigned char tmp[64]; + + memcpy(&state[0], CW, sizeof CW); + memcpy(&state[4], kw, sizeof kw); + state[12] = cc; + memcpy(&state[13], ivw, sizeof ivw); + for (i = 0; i < 10; i ++) { + +#define QROUND(a, b, c, d) do { \ + state[a] += state[b]; \ + state[d] ^= state[a]; \ + state[d] = (state[d] << 16) | (state[d] >> 16); \ + state[c] += state[d]; \ + state[b] ^= state[c]; \ + state[b] = (state[b] << 12) | (state[b] >> 20); \ + state[a] += state[b]; \ + state[d] ^= state[a]; \ + state[d] = (state[d] << 8) | (state[d] >> 24); \ + state[c] += state[d]; \ + state[b] ^= state[c]; \ + state[b] = (state[b] << 7) | (state[b] >> 25); \ + } while (0) + + QROUND( 0, 4, 8, 12); + QROUND( 1, 5, 9, 13); + QROUND( 2, 6, 10, 14); + QROUND( 3, 7, 11, 15); + QROUND( 0, 5, 10, 15); + QROUND( 1, 6, 11, 12); + QROUND( 2, 7, 8, 13); + QROUND( 3, 4, 9, 14); + +#undef QROUND + + } + for (u = 0; u < 4; u ++) { + br_enc32le(&tmp[u << 2], state[u] + CW[u]); + } + for (u = 4; u < 12; u ++) { + br_enc32le(&tmp[u << 2], state[u] + kw[u - 4]); + } + br_enc32le(&tmp[48], state[12] + cc); + for (u = 13; u < 16; u ++) { + br_enc32le(&tmp[u << 2], state[u] + ivw[u - 13]); + } + + clen = len < 64 ? len : 64; + for (u = 0; u < clen; u ++) { + buf[u] ^= tmp[u]; + } + buf += clen; + len -= clen; + cc ++; + } + return cc; +} -- cgit