1 /* 2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org> 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining 5 * a copy of this software and associated documentation files (the 6 * "Software"), to deal in the Software without restriction, including 7 * without limitation the rights to use, copy, modify, merge, publish, 8 * distribute, sublicense, and/or sell copies of the Software, and to 9 * permit persons to whom the Software is furnished to do so, subject to 10 * the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be 13 * included in all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 * SOFTWARE. 23 */ 24 25 #include "inner.h" 26 27 /* see bearssl_block.h */ 28 void 29 br_aes_ct64_cbcenc_init(br_aes_ct64_cbcenc_keys *ctx, 30 const void *key, size_t len) 31 { 32 ctx->vtable = &br_aes_ct64_cbcenc_vtable; 33 ctx->num_rounds = br_aes_ct64_keysched(ctx->skey, key, len); 34 } 35 36 /* see bearssl_block.h */ 37 void 38 br_aes_ct64_cbcenc_run(const br_aes_ct64_cbcenc_keys *ctx, 39 void *iv, void *data, size_t len) 40 { 41 unsigned char *buf; 42 uint64_t sk_exp[120]; 43 uint32_t ivw[4]; 44 45 br_aes_ct64_skey_expand(sk_exp, ctx->num_rounds, ctx->skey); 46 br_range_dec32le(ivw, 4, iv); 47 buf = data; 48 while (len > 0) { 49 uint32_t w[4]; 50 uint64_t q[8]; 51 52 w[0] = ivw[0] ^ br_dec32le(buf); 53 w[1] = ivw[1] ^ br_dec32le(buf + 4); 54 w[2] = ivw[2] ^ br_dec32le(buf + 8); 55 w[3] = ivw[3] ^ br_dec32le(buf + 12); 56 br_aes_ct64_interleave_in(&q[0], &q[4], w); 57 br_aes_ct64_ortho(q); 58 br_aes_ct64_bitslice_encrypt(ctx->num_rounds, sk_exp, q); 59 br_aes_ct64_ortho(q); 60 br_aes_ct64_interleave_out(w, q[0], q[4]); 61 memcpy(ivw, w, sizeof w); 62 br_enc32le(buf, w[0]); 63 br_enc32le(buf + 4, w[1]); 64 br_enc32le(buf + 8, w[2]); 65 br_enc32le(buf + 12, w[3]); 66 buf += 16; 67 len -= 16; 68 } 69 br_range_enc32le(iv, ivw, 4); 70 } 71 72 /* see bearssl_block.h */ 73 const br_block_cbcenc_class br_aes_ct64_cbcenc_vtable = { 74 sizeof(br_aes_ct64_cbcenc_keys), 75 16, 76 4, 77 (void (*)(const br_block_cbcenc_class **, const void *, size_t)) 78 &br_aes_ct64_cbcenc_init, 79 (void (*)(const br_block_cbcenc_class *const *, void *, void *, size_t)) 80 &br_aes_ct64_cbcenc_run 81 }; 82