1*0957b409SSimon J. Gerraty /* 2*0957b409SSimon J. Gerraty * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org> 3*0957b409SSimon J. Gerraty * 4*0957b409SSimon J. Gerraty * Permission is hereby granted, free of charge, to any person obtaining 5*0957b409SSimon J. Gerraty * a copy of this software and associated documentation files (the 6*0957b409SSimon J. Gerraty * "Software"), to deal in the Software without restriction, including 7*0957b409SSimon J. Gerraty * without limitation the rights to use, copy, modify, merge, publish, 8*0957b409SSimon J. Gerraty * distribute, sublicense, and/or sell copies of the Software, and to 9*0957b409SSimon J. Gerraty * permit persons to whom the Software is furnished to do so, subject to 10*0957b409SSimon J. Gerraty * the following conditions: 11*0957b409SSimon J. Gerraty * 12*0957b409SSimon J. Gerraty * The above copyright notice and this permission notice shall be 13*0957b409SSimon J. Gerraty * included in all copies or substantial portions of the Software. 14*0957b409SSimon J. Gerraty * 15*0957b409SSimon J. Gerraty * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16*0957b409SSimon J. Gerraty * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17*0957b409SSimon J. Gerraty * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18*0957b409SSimon J. Gerraty * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 19*0957b409SSimon J. Gerraty * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 20*0957b409SSimon J. Gerraty * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 21*0957b409SSimon J. Gerraty * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22*0957b409SSimon J. Gerraty * SOFTWARE. 23*0957b409SSimon J. Gerraty */ 24*0957b409SSimon J. Gerraty 25*0957b409SSimon J. Gerraty #include "inner.h" 26*0957b409SSimon J. Gerraty 27*0957b409SSimon J. Gerraty /* see inner.h */ 28*0957b409SSimon J. Gerraty void 29*0957b409SSimon J. Gerraty br_ecdsa_i31_bits2int(uint32_t *x, 30*0957b409SSimon J. Gerraty const void *src, size_t len, uint32_t ebitlen) 31*0957b409SSimon J. Gerraty { 32*0957b409SSimon J. Gerraty uint32_t bitlen, hbitlen; 33*0957b409SSimon J. Gerraty int sc; 34*0957b409SSimon J. Gerraty 35*0957b409SSimon J. Gerraty bitlen = ebitlen - (ebitlen >> 5); 36*0957b409SSimon J. Gerraty hbitlen = (uint32_t)len << 3; 37*0957b409SSimon J. Gerraty if (hbitlen > bitlen) { 38*0957b409SSimon J. Gerraty len = (bitlen + 7) >> 3; 39*0957b409SSimon J. Gerraty sc = (int)((hbitlen - bitlen) & 7); 40*0957b409SSimon J. Gerraty } else { 41*0957b409SSimon J. Gerraty sc = 0; 42*0957b409SSimon J. Gerraty } 43*0957b409SSimon J. Gerraty br_i31_zero(x, ebitlen); 44*0957b409SSimon J. Gerraty br_i31_decode(x, src, len); 45*0957b409SSimon J. Gerraty br_i31_rshift(x, sc); 46*0957b409SSimon J. Gerraty x[0] = ebitlen; 47*0957b409SSimon J. Gerraty } 48