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/*
* Copyright (c) 2016 Thomas Pornin <[email protected]>
*
* 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 bearssl_block.h */
void
br_aes_ct_cbcenc_init(br_aes_ct_cbcenc_keys *ctx,
const void *key, size_t len)
{
ctx->vtable = &br_aes_ct_cbcenc_vtable;
ctx->num_rounds = br_aes_ct_keysched(ctx->skey, key, len);
}
/* see bearssl_block.h */
void
br_aes_ct_cbcenc_run(const br_aes_ct_cbcenc_keys *ctx,
void *iv, void *data, size_t len)
{
unsigned char *buf, *ivbuf;
uint32_t q[8];
uint32_t iv0, iv1, iv2, iv3;
uint32_t sk_exp[120];
q[1] = 0;
q[3] = 0;
q[5] = 0;
q[7] = 0;
br_aes_ct_skey_expand(sk_exp, ctx->num_rounds, ctx->skey);
ivbuf = iv;
iv0 = br_dec32le(ivbuf);
iv1 = br_dec32le(ivbuf + 4);
iv2 = br_dec32le(ivbuf + 8);
iv3 = br_dec32le(ivbuf + 12);
buf = data;
while (len > 0) {
q[0] = iv0 ^ br_dec32le(buf);
q[2] = iv1 ^ br_dec32le(buf + 4);
q[4] = iv2 ^ br_dec32le(buf + 8);
q[6] = iv3 ^ br_dec32le(buf + 12);
br_aes_ct_ortho(q);
br_aes_ct_bitslice_encrypt(ctx->num_rounds, sk_exp, q);
br_aes_ct_ortho(q);
iv0 = q[0];
iv1 = q[2];
iv2 = q[4];
iv3 = q[6];
br_enc32le(buf, iv0);
br_enc32le(buf + 4, iv1);
br_enc32le(buf + 8, iv2);
br_enc32le(buf + 12, iv3);
buf += 16;
len -= 16;
}
br_enc32le(ivbuf, iv0);
br_enc32le(ivbuf + 4, iv1);
br_enc32le(ivbuf + 8, iv2);
br_enc32le(ivbuf + 12, iv3);
}
/* see bearssl_block.h */
const br_block_cbcenc_class br_aes_ct_cbcenc_vtable = {
sizeof(br_aes_ct_cbcenc_keys),
16,
4,
(void (*)(const br_block_cbcenc_class **, const void *, size_t))
&br_aes_ct_cbcenc_init,
(void (*)(const br_block_cbcenc_class *const *, void *, void *, size_t))
&br_aes_ct_cbcenc_run
};
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