Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc / deps / grpc / third_party / boringssl / crypto / fipsmodule / modes / polyval.c

diff --git a/legacy-libs/grpc/deps/grpc/third_party/boringssl/crypto/fipsmodule/modes/polyval.c b/legacy-libs/grpc/deps/grpc/third_party/boringssl/crypto/fipsmodule/modes/polyval.c
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+++ b/legacy-libs/grpc/deps/grpc/third_party/boringssl/crypto/fipsmodule/modes/polyval.c
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+/* Copyright (c) 2016, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include <openssl/base.h>
+
+#include <assert.h>
+#include <string.h>
+
+#include "internal.h"
+#include "../../internal.h"
+
+
+// byte_reverse reverses the order of the bytes in |b->c|.
+static void byte_reverse(polyval_block *b) {
+  const uint64_t t = CRYPTO_bswap8(b->u[0]);
+  b->u[0] = CRYPTO_bswap8(b->u[1]);
+  b->u[1] = t;
+}
+
+// reverse_and_mulX_ghash interprets the bytes |b->c| as a reversed element of
+// the GHASH field, multiplies that by 'x' and serialises the result back into
+// |b|, but with GHASH's backwards bit ordering.
+static void reverse_and_mulX_ghash(polyval_block *b) {
+  uint64_t hi = b->u[0];
+  uint64_t lo = b->u[1];
+  const crypto_word_t carry = constant_time_eq_w(hi & 1, 1);
+  hi >>= 1;
+  hi |= lo << 63;
+  lo >>= 1;
+  lo ^= ((uint64_t) constant_time_select_w(carry, 0xe1, 0)) << 56;
+
+  b->u[0] = CRYPTO_bswap8(lo);
+  b->u[1] = CRYPTO_bswap8(hi);
+}
+
+// POLYVAL(H, X_1, ..., X_n) =
+// ByteReverse(GHASH(mulX_GHASH(ByteReverse(H)), ByteReverse(X_1), ...,
+// ByteReverse(X_n))).
+//
+// See https://tools.ietf.org/html/draft-irtf-cfrg-gcmsiv-02#appendix-A.
+
+void CRYPTO_POLYVAL_init(struct polyval_ctx *ctx, const uint8_t key[16]) {
+  polyval_block H;
+  OPENSSL_memcpy(H.c, key, 16);
+  reverse_and_mulX_ghash(&H);
+
+  int is_avx;
+  CRYPTO_ghash_init(&ctx->gmult, &ctx->ghash, &ctx->H, ctx->Htable, &is_avx,
+                    H.c);
+  OPENSSL_memset(&ctx->S, 0, sizeof(ctx->S));
+}
+
+void CRYPTO_POLYVAL_update_blocks(struct polyval_ctx *ctx, const uint8_t *in,
+                                  size_t in_len) {
+  assert((in_len & 15) == 0);
+  polyval_block reversed[32];
+
+  while (in_len > 0) {
+    size_t todo = in_len;
+    if (todo > sizeof(reversed)) {
+      todo = sizeof(reversed);
+    }
+    OPENSSL_memcpy(reversed, in, todo);
+    in += todo;
+    in_len -= todo;
+
+    size_t blocks = todo / sizeof(polyval_block);
+    for (size_t i = 0; i < blocks; i++) {
+      byte_reverse(&reversed[i]);
+    }
+
+    ctx->ghash(ctx->S.u, ctx->Htable, (const uint8_t *) reversed, todo);
+  }
+}
+
+void CRYPTO_POLYVAL_finish(const struct polyval_ctx *ctx, uint8_t out[16]) {
+  polyval_block S = ctx->S;
+  byte_reverse(&S);
+  OPENSSL_memcpy(out, &S.c, sizeof(polyval_block));
+}