summaryrefslogtreecommitdiffstats
path: root/debian/vendor-h2o/deps/picotls/deps/cifra/src/cmac.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--debian/vendor-h2o/deps/picotls/deps/cifra/src/cmac.c150
1 files changed, 0 insertions, 150 deletions
diff --git a/debian/vendor-h2o/deps/picotls/deps/cifra/src/cmac.c b/debian/vendor-h2o/deps/picotls/deps/cifra/src/cmac.c
deleted file mode 100644
index 51f5843..0000000
--- a/debian/vendor-h2o/deps/picotls/deps/cifra/src/cmac.c
+++ /dev/null
@@ -1,150 +0,0 @@
-/*
- * cifra - embedded cryptography library
- * Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com>
- *
- * To the extent possible under law, the author(s) have dedicated all
- * copyright and related and neighboring rights to this software to the
- * public domain worldwide. This software is distributed without any
- * warranty.
- *
- * You should have received a copy of the CC0 Public Domain Dedication
- * along with this software. If not, see
- * <http://creativecommons.org/publicdomain/zero/1.0/>.
- */
-
-#include "handy.h"
-#include "prp.h"
-#include "modes.h"
-#include "bitops.h"
-#include "blockwise.h"
-#include "gf128.h"
-#include "tassert.h"
-
-#include <string.h>
-
-void cf_cmac_init(cf_cmac *ctx, const cf_prp *prp, void *prpctx)
-{
- uint8_t L[CF_MAXBLOCK];
- assert(prp->blocksz == 16);
-
- mem_clean(ctx, sizeof *ctx);
-
- /* L = E_K(0^n) */
- mem_clean(L, prp->blocksz);
- prp->encrypt(prpctx, L, L);
-
- /* B = 2L */
- cf_gf128 gf;
- cf_gf128_frombytes_be(L, gf);
- cf_gf128_double(gf, gf);
- cf_gf128_tobytes_be(gf, ctx->B);
-
- /* P = 4L */
- cf_gf128_double(gf, gf);
- cf_gf128_tobytes_be(gf, ctx->P);
-
- ctx->prp = prp;
- ctx->prpctx = prpctx;
-}
-
-void cf_cmac_sign(cf_cmac *ctx, const uint8_t *data, size_t len, uint8_t out[CF_MAXBLOCK])
-{
- cf_cmac_stream stream;
- stream.cmac = *ctx;
- cf_cmac_stream_reset(&stream);
- cf_cmac_stream_update(&stream, data, len, 1);
- cf_cmac_stream_final(&stream, out);
-}
-
-void cf_cmac_stream_init(cf_cmac_stream *ctx, const cf_prp *prp, void *prpctx)
-{
- cf_cmac_init(&ctx->cmac, prp, prpctx);
- cf_cmac_stream_reset(ctx);
-}
-
-void cf_cmac_stream_reset(cf_cmac_stream *ctx)
-{
- uint8_t iv_zero[CF_MAXBLOCK] = { 0 };
- cf_cbc_init(&ctx->cbc, ctx->cmac.prp, ctx->cmac.prpctx, iv_zero);
- mem_clean(ctx->buffer, sizeof ctx->buffer);
- ctx->used = 0;
- ctx->processed = 0;
- ctx->finalised = 0;
-}
-
-static void cmac_process(void *vctx, const uint8_t *block)
-{
- cf_cmac_stream *ctx = vctx;
- uint8_t output[CF_MAXBLOCK];
- cf_cbc_encrypt(&ctx->cbc, block, output, 1);
- ctx->processed += ctx->cmac.prp->blocksz;
-}
-
-static void cmac_process_final(cf_cmac_stream *ctx, const uint8_t *block,
- const uint8_t *xor)
-{
- uint8_t input[CF_MAXBLOCK];
- uint8_t output[CF_MAXBLOCK];
- xor_bb(input, block, xor, ctx->cmac.prp->blocksz);
- cf_cbc_encrypt(&ctx->cbc, input, output, 1);
- ctx->processed += ctx->cmac.prp->blocksz;
- /* signature is in ctx->cbc.block. */
-}
-
-static void cmac_process_final_nopad(void *vctx, const uint8_t *block)
-{
- cf_cmac_stream *ctx = vctx;
- cmac_process_final(ctx, block, ctx->cmac.B);
- ctx->finalised = 1;
-}
-
-static void cmac_process_final_pad(void *vctx, const uint8_t *block)
-{
- cf_cmac_stream *ctx = vctx;
- cmac_process_final(ctx, block, ctx->cmac.P);
- ctx->finalised = 1;
-}
-
-void cf_cmac_stream_update(cf_cmac_stream *ctx, const uint8_t *data, size_t len, int isfinal)
-{
- size_t blocksz = ctx->cmac.prp->blocksz;
- cf_blockwise_in_fn final_fn = cmac_process;
- int needpad = 0;
-
- if (isfinal)
- {
- int whole_number_of_blocks = ((len + ctx->used) & 0xf) == 0;
- int empty_message = len == 0 && ctx->used == 0 && ctx->processed == 0;
-
- assert(!ctx->finalised); /* finalised before? */
- assert(len != 0 || empty_message); /* we can't be told we're done after the fact. */
-
- /* If we have a whole number of blocks, and at least 1 block, we XOR in B.
- * Otherwise, we need to pad and XOR in P. */
- if (whole_number_of_blocks && !empty_message)
- final_fn = cmac_process_final_nopad;
- else
- needpad = 1;
- }
-
- /* Input data */
- cf_blockwise_accumulate_final(ctx->buffer, &ctx->used, blocksz,
- data, len,
- cmac_process,
- final_fn, ctx);
-
- /* Input padding */
- if (needpad)
- {
- cf_blockwise_acc_pad(ctx->buffer, &ctx->used, blocksz,
- 0x80, 0x00, 0x00, blocksz - ctx->used,
- cmac_process_final_pad, ctx);
- }
-}
-
-void cf_cmac_stream_final(cf_cmac_stream *ctx, uint8_t out[CF_MAXBLOCK])
-{
- assert(ctx->finalised);
- memcpy(out, ctx->cbc.block, ctx->cmac.prp->blocksz);
-}
-