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_ct64_cbcenc_init(br_aes_ct64_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_ct64_cbcenc_vtable; 33*0957b409SSimon J. Gerraty ctx->num_rounds = br_aes_ct64_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_ct64_cbcenc_run(const br_aes_ct64_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; 42*0957b409SSimon J. Gerraty uint64_t sk_exp[120]; 43*0957b409SSimon J. Gerraty uint32_t ivw[4]; 44*0957b409SSimon J. Gerraty 45*0957b409SSimon J. Gerraty br_aes_ct64_skey_expand(sk_exp, ctx->num_rounds, ctx->skey); 46*0957b409SSimon J. Gerraty br_range_dec32le(ivw, 4, iv); 47*0957b409SSimon J. Gerraty buf = data; 48*0957b409SSimon J. Gerraty while (len > 0) { 49*0957b409SSimon J. Gerraty uint32_t w[4]; 50*0957b409SSimon J. Gerraty uint64_t q[8]; 51*0957b409SSimon J. Gerraty 52*0957b409SSimon J. Gerraty w[0] = ivw[0] ^ br_dec32le(buf); 53*0957b409SSimon J. Gerraty w[1] = ivw[1] ^ br_dec32le(buf + 4); 54*0957b409SSimon J. Gerraty w[2] = ivw[2] ^ br_dec32le(buf + 8); 55*0957b409SSimon J. Gerraty w[3] = ivw[3] ^ br_dec32le(buf + 12); 56*0957b409SSimon J. Gerraty br_aes_ct64_interleave_in(&q[0], &q[4], w); 57*0957b409SSimon J. Gerraty br_aes_ct64_ortho(q); 58*0957b409SSimon J. Gerraty br_aes_ct64_bitslice_encrypt(ctx->num_rounds, sk_exp, q); 59*0957b409SSimon J. Gerraty br_aes_ct64_ortho(q); 60*0957b409SSimon J. Gerraty br_aes_ct64_interleave_out(w, q[0], q[4]); 61*0957b409SSimon J. Gerraty memcpy(ivw, w, sizeof w); 62*0957b409SSimon J. Gerraty br_enc32le(buf, w[0]); 63*0957b409SSimon J. Gerraty br_enc32le(buf + 4, w[1]); 64*0957b409SSimon J. Gerraty br_enc32le(buf + 8, w[2]); 65*0957b409SSimon J. Gerraty br_enc32le(buf + 12, w[3]); 66*0957b409SSimon J. Gerraty buf += 16; 67*0957b409SSimon J. Gerraty len -= 16; 68*0957b409SSimon J. Gerraty } 69*0957b409SSimon J. Gerraty br_range_enc32le(iv, ivw, 4); 70*0957b409SSimon J. Gerraty } 71*0957b409SSimon J. Gerraty 72*0957b409SSimon J. Gerraty /* see bearssl_block.h */ 73*0957b409SSimon J. Gerraty const br_block_cbcenc_class br_aes_ct64_cbcenc_vtable = { 74*0957b409SSimon J. Gerraty sizeof(br_aes_ct64_cbcenc_keys), 75*0957b409SSimon J. Gerraty 16, 76*0957b409SSimon J. Gerraty 4, 77*0957b409SSimon J. Gerraty (void (*)(const br_block_cbcenc_class **, const void *, size_t)) 78*0957b409SSimon J. Gerraty &br_aes_ct64_cbcenc_init, 79*0957b409SSimon J. Gerraty (void (*)(const br_block_cbcenc_class *const *, void *, void *, size_t)) 80*0957b409SSimon J. Gerraty &br_aes_ct64_cbcenc_run 81*0957b409SSimon J. Gerraty }; 82