1 files changed, 183 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/message_digest.cc b/third_party/libwebrtc/rtc_base/message_digest.cc
new file mode 100644
index 0000000000..56abcd2c7b
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/message_digest.cc
@@ -0,0 +1,183 @@
+/*
+ *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rtc_base/message_digest.h"
+
+#include <string.h>
+
+#include <cstdint>
+#include <memory>
+
+#include "absl/strings/string_view.h"
+#include "rtc_base/openssl_digest.h"
+#include "rtc_base/string_encode.h"
+
+namespace rtc {
+
+// From RFC 4572.
+const char DIGEST_MD5[] = "md5";
+const char DIGEST_SHA_1[] = "sha-1";
+const char DIGEST_SHA_224[] = "sha-224";
+const char DIGEST_SHA_256[] = "sha-256";
+const char DIGEST_SHA_384[] = "sha-384";
+const char DIGEST_SHA_512[] = "sha-512";
+
+static const size_t kBlockSize = 64;  // valid for SHA-256 and down
+
+MessageDigest* MessageDigestFactory::Create(absl::string_view alg) {
+  MessageDigest* digest = new OpenSSLDigest(alg);
+  if (digest->Size() == 0) {  // invalid algorithm
+    delete digest;
+    digest = nullptr;
+  }
+  return digest;
+}
+
+bool IsFips180DigestAlgorithm(absl::string_view alg) {
+  // These are the FIPS 180 algorithms.  According to RFC 4572 Section 5,
+  // "Self-signed certificates (for which legacy certificates are not a
+  // consideration) MUST use one of the FIPS 180 algorithms (SHA-1,
+  // SHA-224, SHA-256, SHA-384, or SHA-512) as their signature algorithm,
+  // and thus also MUST use it to calculate certificate fingerprints."
+  return alg == DIGEST_SHA_1 || alg == DIGEST_SHA_224 ||
+         alg == DIGEST_SHA_256 || alg == DIGEST_SHA_384 ||
+         alg == DIGEST_SHA_512;
+}
+
+size_t ComputeDigest(MessageDigest* digest,
+                     const void* input,
+                     size_t in_len,
+                     void* output,
+                     size_t out_len) {
+  digest->Update(input, in_len);
+  return digest->Finish(output, out_len);
+}
+
+size_t ComputeDigest(absl::string_view alg,
+                     const void* input,
+                     size_t in_len,
+                     void* output,
+                     size_t out_len) {
+  std::unique_ptr<MessageDigest> digest(MessageDigestFactory::Create(alg));
+  return (digest) ? ComputeDigest(digest.get(), input, in_len, output, out_len)
+                  : 0;
+}
+
+std::string ComputeDigest(MessageDigest* digest, absl::string_view input) {
+  std::unique_ptr<char[]> output(new char[digest->Size()]);
+  ComputeDigest(digest, input.data(), input.size(), output.get(),
+                digest->Size());
+  return hex_encode(absl::string_view(output.get(), digest->Size()));
+}
+
+bool ComputeDigest(absl::string_view alg,
+                   absl::string_view input,
+                   std::string* output) {
+  std::unique_ptr<MessageDigest> digest(MessageDigestFactory::Create(alg));
+  if (!digest) {
+    return false;
+  }
+  *output = ComputeDigest(digest.get(), input);
+  return true;
+}
+
+std::string ComputeDigest(absl::string_view alg, absl::string_view input) {
+  std::string output;
+  ComputeDigest(alg, input, &output);
+  return output;
+}
+
+// Compute a RFC 2104 HMAC: H(K XOR opad, H(K XOR ipad, text))
+size_t ComputeHmac(MessageDigest* digest,
+                   const void* key,
+                   size_t key_len,
+                   const void* input,
+                   size_t in_len,
+                   void* output,
+                   size_t out_len) {
+  // We only handle algorithms with a 64-byte blocksize.
+  // TODO: Add BlockSize() method to MessageDigest.
+  size_t block_len = kBlockSize;
+  if (digest->Size() > 32) {
+    return 0;
+  }
+  // Copy the key to a block-sized buffer to simplify padding.
+  // If the key is longer than a block, hash it and use the result instead.
+  std::unique_ptr<uint8_t[]> new_key(new uint8_t[block_len]);
+  if (key_len > block_len) {
+    ComputeDigest(digest, key, key_len, new_key.get(), block_len);
+    memset(new_key.get() + digest->Size(), 0, block_len - digest->Size());
+  } else {
+    memcpy(new_key.get(), key, key_len);
+    memset(new_key.get() + key_len, 0, block_len - key_len);
+  }
+  // Set up the padding from the key, salting appropriately for each padding.
+  std::unique_ptr<uint8_t[]> o_pad(new uint8_t[block_len]);
+  std::unique_ptr<uint8_t[]> i_pad(new uint8_t[block_len]);
+  for (size_t i = 0; i < block_len; ++i) {
+    o_pad[i] = 0x5c ^ new_key[i];
+    i_pad[i] = 0x36 ^ new_key[i];
+  }
+  // Inner hash; hash the inner padding, and then the input buffer.
+  std::unique_ptr<uint8_t[]> inner(new uint8_t[digest->Size()]);
+  digest->Update(i_pad.get(), block_len);
+  digest->Update(input, in_len);
+  digest->Finish(inner.get(), digest->Size());
+  // Outer hash; hash the outer padding, and then the result of the inner hash.
+  digest->Update(o_pad.get(), block_len);
+  digest->Update(inner.get(), digest->Size());
+  return digest->Finish(output, out_len);
+}
+
+size_t ComputeHmac(absl::string_view alg,
+                   const void* key,
+                   size_t key_len,
+                   const void* input,
+                   size_t in_len,
+                   void* output,
+                   size_t out_len) {
+  std::unique_ptr<MessageDigest> digest(MessageDigestFactory::Create(alg));
+  if (!digest) {
+    return 0;
+  }
+  return ComputeHmac(digest.get(), key, key_len, input, in_len, output,
+                     out_len);
+}
+
+std::string ComputeHmac(MessageDigest* digest,
+                        absl::string_view key,
+                        absl::string_view input) {
+  std::unique_ptr<char[]> output(new char[digest->Size()]);
+  ComputeHmac(digest, key.data(), key.size(), input.data(), input.size(),
+              output.get(), digest->Size());
+  return hex_encode(absl::string_view(output.get(), digest->Size()));
+}
+
+bool ComputeHmac(absl::string_view alg,
+                 absl::string_view key,
+                 absl::string_view input,
+                 std::string* output) {
+  std::unique_ptr<MessageDigest> digest(MessageDigestFactory::Create(alg));
+  if (!digest) {
+    return false;
+  }
+  *output = ComputeHmac(digest.get(), key, input);
+  return true;
+}
+
+std::string ComputeHmac(absl::string_view alg,
+                        absl::string_view key,
+                        absl::string_view input) {
+  std::string output;
+  ComputeHmac(alg, key, input, &output);
+  return output;
+}
+
+}  // namespace rtc