BoringSSL as optional cryptobackend for ngtcp2

PR добавляет возможность использовать BoringSSL в ngtcp2 в качестве криптобиблиотеки. Для проектов в Аркадии, уже зависящих от ngtcp2, добавлена явная зависимость от слоя абстракции quictls (сейчас в транке ngtcp2 собирается с quictls).
commit_hash:3d6607abecfcff2157859acbdd18f9d0345ac485

1 files changed, 90 insertions, 0 deletions

diff --git a/contrib/restricted/google/boringssl/crypto/fipsmodule/modes/polyval.c b/contrib/restricted/google/boringssl/crypto/fipsmodule/modes/polyval.c
new file mode 100644
index 00000000000..cee7d3ca79e
--- /dev/null
+++ b/contrib/restricted/google/boringssl/crypto/fipsmodule/modes/polyval.c
@@ -0,0 +1,90 @@
+/* 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 <contrib/restricted/google/boringssl/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(uint8_t b[16]) {
+  uint64_t hi = CRYPTO_load_u64_le(b);
+  uint64_t lo = CRYPTO_load_u64_le(b + 8);
+  CRYPTO_store_u64_le(b, CRYPTO_bswap8(lo));
+  CRYPTO_store_u64_le(b + 8, CRYPTO_bswap8(hi));
+}
+
+// reverse_and_mulX_ghash interprets |b| 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(uint8_t b[16]) {
+  uint64_t hi = CRYPTO_load_u64_le(b);
+  uint64_t lo = CRYPTO_load_u64_le(b + 8);
+  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;
+
+  CRYPTO_store_u64_le(b, CRYPTO_bswap8(lo));
+  CRYPTO_store_u64_le(b + 8, CRYPTO_bswap8(hi));
+}
+
+// POLYVAL(H, X_1, ..., X_n) =
+// ByteReverse(GHASH(mulX_GHASH(ByteReverse(H)), ByteReverse(X_1), ...,
+// ByteReverse(X_n))).
+//
+// See https://www.rfc-editor.org/rfc/rfc8452.html#appendix-A.
+
+void CRYPTO_POLYVAL_init(struct polyval_ctx *ctx, const uint8_t key[16]) {
+  alignas(8) uint8_t H[16];
+  OPENSSL_memcpy(H, key, 16);
+  reverse_and_mulX_ghash(H);
+
+  int is_avx;
+  CRYPTO_ghash_init(&ctx->gmult, &ctx->ghash, ctx->Htable, &is_avx, H);
+  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);
+  alignas(8) uint8_t buf[32 * 16];
+
+  while (in_len > 0) {
+    size_t todo = in_len;
+    if (todo > sizeof(buf)) {
+      todo = sizeof(buf);
+    }
+    OPENSSL_memcpy(buf, in, todo);
+    in += todo;
+    in_len -= todo;
+
+    size_t blocks = todo / 16;
+    for (size_t i = 0; i < blocks; i++) {
+      byte_reverse(buf + 16 * i);
+    }
+
+    ctx->ghash(ctx->S, ctx->Htable, buf, todo);
+  }
+}
+
+void CRYPTO_POLYVAL_finish(const struct polyval_ctx *ctx, uint8_t out[16]) {
+  OPENSSL_memcpy(out, &ctx->S, 16);
+  byte_reverse(out);
+}