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/i31_rshift.c | 47 ++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 test/monniaux/BearSSL/src/int/i31_rshift.c (limited to 'test/monniaux/BearSSL/src/int/i31_rshift.c') diff --git a/test/monniaux/BearSSL/src/int/i31_rshift.c b/test/monniaux/BearSSL/src/int/i31_rshift.c new file mode 100644 index 00000000..db6ba0b8 --- /dev/null +++ b/test/monniaux/BearSSL/src/int/i31_rshift.c @@ -0,0 +1,47 @@ +/* + * 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_i31_rshift(uint32_t *x, int count) +{ + size_t u, len; + uint32_t r; + + len = (x[0] + 31) >> 5; + if (len == 0) { + return; + } + r = x[1] >> count; + for (u = 2; u <= len; u ++) { + uint32_t w; + + w = x[u]; + x[u - 1] = ((w << (31 - count)) | r) & 0x7FFFFFFF; + r = w >> count; + } + x[len] = r; +} -- cgit