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 bearssl_block.h */ 28*0957b409SSimon J. Gerraty void 29*0957b409SSimon J. Gerraty br_aes_small_cbcenc_init(br_aes_small_cbcenc_keys *ctx, 30*0957b409SSimon J. Gerraty const void *key, size_t len) 31*0957b409SSimon J. Gerraty { 32*0957b409SSimon J. Gerraty ctx->vtable = &br_aes_small_cbcenc_vtable; 33*0957b409SSimon J. Gerraty ctx->num_rounds = br_aes_keysched(ctx->skey, key, len); 34*0957b409SSimon J. Gerraty } 35*0957b409SSimon J. Gerraty 36*0957b409SSimon J. Gerraty /* see bearssl_block.h */ 37*0957b409SSimon J. Gerraty void 38*0957b409SSimon J. Gerraty br_aes_small_cbcenc_run(const br_aes_small_cbcenc_keys *ctx, 39*0957b409SSimon J. Gerraty void *iv, void *data, size_t len) 40*0957b409SSimon J. Gerraty { 41*0957b409SSimon J. Gerraty unsigned char *buf, *ivbuf; 42*0957b409SSimon J. Gerraty 43*0957b409SSimon J. Gerraty ivbuf = iv; 44*0957b409SSimon J. Gerraty buf = data; 45*0957b409SSimon J. Gerraty while (len > 0) { 46*0957b409SSimon J. Gerraty int i; 47*0957b409SSimon J. Gerraty 48*0957b409SSimon J. Gerraty for (i = 0; i < 16; i ++) { 49*0957b409SSimon J. Gerraty buf[i] ^= ivbuf[i]; 50*0957b409SSimon J. Gerraty } 51*0957b409SSimon J. Gerraty br_aes_small_encrypt(ctx->num_rounds, ctx->skey, buf); 52*0957b409SSimon J. Gerraty memcpy(ivbuf, buf, 16); 53*0957b409SSimon J. Gerraty buf += 16; 54*0957b409SSimon J. Gerraty len -= 16; 55*0957b409SSimon J. Gerraty } 56*0957b409SSimon J. Gerraty } 57*0957b409SSimon J. Gerraty 58*0957b409SSimon J. Gerraty /* see bearssl_block.h */ 59*0957b409SSimon J. Gerraty const br_block_cbcenc_class br_aes_small_cbcenc_vtable = { 60*0957b409SSimon J. Gerraty sizeof(br_aes_small_cbcenc_keys), 61*0957b409SSimon J. Gerraty 16, 62*0957b409SSimon J. Gerraty 4, 63*0957b409SSimon J. Gerraty (void (*)(const br_block_cbcenc_class **, const void *, size_t)) 64*0957b409SSimon J. Gerraty &br_aes_small_cbcenc_init, 65*0957b409SSimon J. Gerraty (void (*)(const br_block_cbcenc_class *const *, void *, void *, size_t)) 66*0957b409SSimon J. Gerraty &br_aes_small_cbcenc_run 67*0957b409SSimon J. Gerraty }; 68