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head/contrib/bearssl/src/int/i15_fmont.c
| Property | Old Value | New Value |
|---|---|---|
| svn:eol-style | null | native \ No newline at end of property |
| svn:keywords | null | FreeBSD=%H \ No newline at end of property |
| svn:mime-type | null | text/plain \ No newline at end of property |
| /* | |||||
| * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org> | |||||
| * | |||||
| * 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_i15_from_monty(uint16_t *x, const uint16_t *m, uint16_t m0i) | |||||
| { | |||||
| size_t len, u, v; | |||||
| len = (m[0] + 15) >> 4; | |||||
| for (u = 0; u < len; u ++) { | |||||
| uint32_t f, cc; | |||||
| f = MUL15(x[1], m0i) & 0x7FFF; | |||||
| cc = 0; | |||||
| for (v = 0; v < len; v ++) { | |||||
| uint32_t z; | |||||
| z = (uint32_t)x[v + 1] + MUL15(f, m[v + 1]) + cc; | |||||
| cc = z >> 15; | |||||
| if (v != 0) { | |||||
| x[v] = z & 0x7FFF; | |||||
| } | |||||
| } | |||||
| x[len] = cc; | |||||
| } | |||||
| /* | |||||
| * We may have to do an extra subtraction, but only if the | |||||
| * value in x[] is indeed greater than or equal to that of m[], | |||||
| * which is why we must do two calls (first call computes the | |||||
| * carry, second call performs the subtraction only if the carry | |||||
| * is 0). | |||||
| */ | |||||
| br_i15_sub(x, m, NOT(br_i15_sub(x, m, 0))); | |||||
| } | |||||