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/int/i32_encode.c | 72 ++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 test/monniaux/BearSSL/src/int/i32_encode.c (limited to 'test/monniaux/BearSSL/src/int/i32_encode.c') diff --git a/test/monniaux/BearSSL/src/int/i32_encode.c b/test/monniaux/BearSSL/src/int/i32_encode.c new file mode 100644 index 00000000..303652f9 --- /dev/null +++ b/test/monniaux/BearSSL/src/int/i32_encode.c @@ -0,0 +1,72 @@ +/* + * 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 inner.h */ +void +br_i32_encode(void *dst, size_t len, const uint32_t *x) +{ + unsigned char *buf; + size_t k; + + buf = dst; + + /* + * Compute the announced size of x in bytes; extra bytes are + * filled with zeros. + */ + k = (x[0] + 7) >> 3; + while (len > k) { + *buf ++ = 0; + len --; + } + + /* + * Now we use k as index within x[]. That index starts at 1; + * we initialize it to the topmost complete word, and process + * any remaining incomplete word. + */ + k = (len + 3) >> 2; + switch (len & 3) { + case 3: + *buf ++ = x[k] >> 16; + /* fall through */ + case 2: + *buf ++ = x[k] >> 8; + /* fall through */ + case 1: + *buf ++ = x[k]; + k --; + } + + /* + * Encode all complete words. + */ + while (k > 0) { + br_enc32be(buf, x[k]); + k --; + buf += 4; + } +} -- cgit