Implement ChannelIDVerifier using NSS.

net/quic/crypto/channel_id_nss.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/crypto/channel_id.h"
 
+#include <keythi.h>
+#include <pk11pub.h>
+#include <sechash.h>
+
 using base::StringPiece;
 
 namespace net {
 
-// TODO(rtenneti): Implement NSS support for ChannelIDVerifier::Verify and
-// real ChannelIDSigner (using the SpdyCredentialBuilder as a model).
 // static
 bool ChannelIDVerifier::Verify(StringPiece key,
                                StringPiece signed_data,
                                StringPiece signature) {
-  return true;
+  return VerifyRaw(key, signed_data, signature, true);
+}
+
+// static
+bool ChannelIDVerifier::VerifyRaw(StringPiece key,
+                                  StringPiece signed_data,
+                                  StringPiece signature,
+                                  bool is_channel_id_signature) {
+  if (key.size() != 32 * 2 ||
+      signature.size() != 32 * 2) {
+    return false;
+  }
+
+  SECKEYPublicKey public_key;
+  memset(&public_key, 0, sizeof(public_key));
+
+  // DER encoding of the object identifier (OID) of the named curve P-256
+  // (1.2.840.10045.3.1.7). See RFC 6637 Section 11.
+  static const unsigned char p256_oid[] = {
+    0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07
+  };
+  public_key.keyType = ecKey;
+  public_key.u.ec.DEREncodedParams.type = siBuffer;
+  public_key.u.ec.DEREncodedParams.data = const_cast<unsigned char*>(p256_oid);
+  public_key.u.ec.DEREncodedParams.len = sizeof(p256_oid);
+
+  unsigned char key_buf[65];
+  key_buf[0] = 0x04;
+  memcpy(&key_buf[1], key.data(), key.size());
+  public_key.u.ec.publicValue.type = siBuffer;
+  public_key.u.ec.publicValue.data = key_buf;
+  public_key.u.ec.publicValue.len = sizeof(key_buf);
+
+  SECItem signature_item = {
+    siBuffer,
+    reinterpret_cast<unsigned char*>(const_cast<char*>(signature.data())),
+    signature.size()
+  };
+
+  unsigned char hash_buf[SHA256_LENGTH];
+  SECItem hash_item = { siBuffer, hash_buf, sizeof(hash_buf) };
+
+  HASHContext* sha256 = HASH_Create(HASH_AlgSHA256);
+  if (!sha256) {
+    return false;
+  }
+  HASH_Begin(sha256);
+  if (is_channel_id_signature) {
+    HASH_Update(sha256, reinterpret_cast<const unsigned char*>(kContextStr),
+                strlen(kContextStr) + 1);
+    HASH_Update(sha256,
+                reinterpret_cast<const unsigned char*>(kClientToServerStr),
+                strlen(kClientToServerStr) + 1);
+  }
+  HASH_Update(sha256,
+              reinterpret_cast<const unsigned char*>(signed_data.data()),
+              signed_data.size());
+  HASH_End(sha256, hash_buf, &hash_item.len, sizeof(hash_buf));
+  HASH_Destroy(sha256);
+
+  return PK11_Verify(&public_key, &signature_item, &hash_item, NULL) ==
+         SECSuccess;
 }
 
 }  // namespace net