diff options
Diffstat (limited to 'third_party/bearssl/src/aes_ct64_cbcenc.c')
| -rw-r--r-- | third_party/bearssl/src/aes_ct64_cbcenc.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/third_party/bearssl/src/aes_ct64_cbcenc.c b/third_party/bearssl/src/aes_ct64_cbcenc.c new file mode 100644 index 0000000..6cb9dec --- /dev/null +++ b/third_party/bearssl/src/aes_ct64_cbcenc.c @@ -0,0 +1,81 @@ +/* + * 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_ct64_cbcenc_init(br_aes_ct64_cbcenc_keys *ctx, + const void *key, size_t len) +{ + ctx->vtable = &br_aes_ct64_cbcenc_vtable; + ctx->num_rounds = br_aes_ct64_keysched(ctx->skey, key, len); +} + +/* see bearssl_block.h */ +void +br_aes_ct64_cbcenc_run(const br_aes_ct64_cbcenc_keys *ctx, + void *iv, void *data, size_t len) +{ + unsigned char *buf; + uint64_t sk_exp[120]; + uint32_t ivw[4]; + + br_aes_ct64_skey_expand(sk_exp, ctx->num_rounds, ctx->skey); + br_range_dec32le(ivw, 4, iv); + buf = data; + while (len > 0) { + uint32_t w[4]; + uint64_t q[8]; + + w[0] = ivw[0] ^ br_dec32le(buf); + w[1] = ivw[1] ^ br_dec32le(buf + 4); + w[2] = ivw[2] ^ br_dec32le(buf + 8); + w[3] = ivw[3] ^ br_dec32le(buf + 12); + br_aes_ct64_interleave_in(&q[0], &q[4], w); + br_aes_ct64_ortho(q); + br_aes_ct64_bitslice_encrypt(ctx->num_rounds, sk_exp, q); + br_aes_ct64_ortho(q); + br_aes_ct64_interleave_out(w, q[0], q[4]); + memcpy(ivw, w, sizeof w); + br_enc32le(buf, w[0]); + br_enc32le(buf + 4, w[1]); + br_enc32le(buf + 8, w[2]); + br_enc32le(buf + 12, w[3]); + buf += 16; + len -= 16; + } + br_range_enc32le(iv, ivw, 4); +} + +/* see bearssl_block.h */ +const br_block_cbcenc_class br_aes_ct64_cbcenc_vtable = { + sizeof(br_aes_ct64_cbcenc_keys), + 16, + 4, + (void (*)(const br_block_cbcenc_class **, const void *, size_t)) + &br_aes_ct64_cbcenc_init, + (void (*)(const br_block_cbcenc_class *const *, void *, void *, size_t)) + &br_aes_ct64_cbcenc_run +}; |