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1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "net/quic/crypto/channel_id.h" | |
6 | |
7 #include <openssl/bn.h> | |
8 #include <openssl/ec.h> | |
9 #include <openssl/ecdsa.h> | |
10 #include <openssl/obj_mac.h> | |
11 #include <openssl/sha.h> | |
12 | |
13 #include "crypto/openssl_util.h" | |
14 #include "crypto/scoped_openssl_types.h" | |
15 | |
16 using base::StringPiece; | |
17 | |
18 namespace net { | |
19 | |
20 // static | |
21 const char ChannelIDVerifier::kContextStr[] = "QUIC ChannelID"; | |
22 // static | |
23 const char ChannelIDVerifier::kClientToServerStr[] = "client -> server"; | |
24 | |
25 // static | |
26 bool ChannelIDVerifier::Verify(StringPiece key, | |
27 StringPiece signed_data, | |
28 StringPiece signature) { | |
29 return VerifyRaw(key, signed_data, signature, true); | |
30 } | |
31 | |
32 // static | |
33 bool ChannelIDVerifier::VerifyRaw(StringPiece key, | |
34 StringPiece signed_data, | |
35 StringPiece signature, | |
36 bool is_channel_id_signature) { | |
37 if (key.size() != 32 * 2 || signature.size() != 32 * 2) { | |
38 return false; | |
39 } | |
40 | |
41 crypto::ScopedEC_GROUP p256(EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1)); | |
42 if (!p256) { | |
43 return false; | |
44 } | |
45 | |
46 crypto::ScopedBIGNUM x(BN_new()), y(BN_new()), r(BN_new()), s(BN_new()); | |
47 | |
48 ECDSA_SIG sig; | |
49 sig.r = r.get(); | |
50 sig.s = s.get(); | |
51 | |
52 const uint8_t* key_bytes = reinterpret_cast<const uint8_t*>(key.data()); | |
53 const uint8_t* signature_bytes = | |
54 reinterpret_cast<const uint8_t*>(signature.data()); | |
55 | |
56 if (BN_bin2bn(key_bytes + 0, 32, x.get()) == nullptr || | |
57 BN_bin2bn(key_bytes + 32, 32, y.get()) == nullptr || | |
58 BN_bin2bn(signature_bytes + 0, 32, sig.r) == nullptr || | |
59 BN_bin2bn(signature_bytes + 32, 32, sig.s) == nullptr) { | |
60 return false; | |
61 } | |
62 | |
63 crypto::ScopedEC_POINT point(EC_POINT_new(p256.get())); | |
64 if (!point || | |
65 !EC_POINT_set_affine_coordinates_GFp(p256.get(), point.get(), x.get(), | |
66 y.get(), nullptr)) { | |
67 return false; | |
68 } | |
69 | |
70 crypto::ScopedEC_KEY ecdsa_key(EC_KEY_new()); | |
71 if (ecdsa_key.get() == nullptr || | |
72 !EC_KEY_set_group(ecdsa_key.get(), p256.get()) || | |
73 !EC_KEY_set_public_key(ecdsa_key.get(), point.get())) { | |
74 return false; | |
75 } | |
76 | |
77 SHA256_CTX sha256; | |
78 SHA256_Init(&sha256); | |
79 if (is_channel_id_signature) { | |
80 SHA256_Update(&sha256, kContextStr, strlen(kContextStr) + 1); | |
81 SHA256_Update(&sha256, kClientToServerStr, strlen(kClientToServerStr) + 1); | |
82 } | |
83 SHA256_Update(&sha256, signed_data.data(), signed_data.size()); | |
84 | |
85 unsigned char digest[SHA256_DIGEST_LENGTH]; | |
86 SHA256_Final(digest, &sha256); | |
87 | |
88 return ECDSA_do_verify(digest, sizeof(digest), &sig, ecdsa_key.get()) == 1; | |
89 } | |
90 | |
91 } // namespace net | |
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