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// 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/cert/jwk_serializer.h"
#include "base/base64url.h"
#include "base/values.h"
#include "starboard/memory.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace {
// This is the ASN.1 prefix for a P-256 public key. Specifically it's:
// SEQUENCE
// SEQUENCE
// OID id-ecPublicKey
// OID prime256v1
// BIT STRING, length 66, 0 trailing bits: 0x04
//
// The 0x04 in the BIT STRING is the prefix for an uncompressed, X9.62
// public key. Following that are the two field elements as 32-byte,
// big-endian numbers, as required by the Channel ID.
static const unsigned char kP256SpkiPrefix[] = {
0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86,
0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03,
0x42, 0x00, 0x04
};
static const unsigned int kEcCoordinateSize = 32U;
// This is a valid P-256 public key.
static const unsigned char kSpkiEc[] = {
0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86,
0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03,
0x42, 0x00, 0x04,
0x29, 0x5d, 0x6e, 0xfe, 0x33, 0x77, 0x26, 0xea,
0x5b, 0xa4, 0xe6, 0x1b, 0x34, 0x6e, 0x7b, 0xa0,
0xa3, 0x8f, 0x33, 0x49, 0xa0, 0x9c, 0xae, 0x98,
0xbd, 0x46, 0x0d, 0xf6, 0xd4, 0x5a, 0xdc, 0x8a,
0x1f, 0x8a, 0xb2, 0x20, 0x51, 0xb7, 0xd2, 0x87,
0x0d, 0x53, 0x7e, 0x5d, 0x94, 0xa3, 0xe0, 0x34,
0x16, 0xa1, 0xcc, 0x10, 0x48, 0xcd, 0x70, 0x9c,
0x05, 0xd3, 0xd2, 0xca, 0xdf, 0x44, 0x2f, 0xf4
};
// This is a P-256 public key with a leading 0.
static const unsigned char kSpkiEcWithLeadingZero[] = {
0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86,
0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03,
0x42, 0x00, 0x04,
0x00, 0x8e, 0xd5, 0x49, 0x51, 0xad, 0x7d, 0xd3,
0x3a, 0x59, 0x86, 0xd1, 0x2c, 0xba, 0x05, 0xd3,
0xa6, 0x3c, 0x5d, 0x6d, 0x28, 0xde, 0x8f, 0xdd,
0xa5, 0x3d, 0x30, 0x18, 0x05, 0x86, 0x76, 0x9c,
0x7c, 0xa7, 0xba, 0x58, 0xea, 0x1a, 0x84, 0x19,
0x29, 0x0a, 0x15, 0x30, 0x7d, 0x6b, 0x00, 0x41,
0x64, 0x56, 0x84, 0x19, 0x54, 0x3e, 0x26, 0x13,
0xc9, 0x1e, 0x31, 0x89, 0xe2, 0x62, 0xcb, 0x3f
};
// Section 2 of RFC 7515 defines that an URL-safe base64 encoding must be used
// with all trailing '=' characters omitted. Returns whether the |input|
// contains any of the forbidden base64 characters (+, -, =).
bool ContainsNonUrlSafeBase64Characters(base::StringPiece input) {
return input.find_first_of("+-=") != std::string::npos;
}
} // namespace
TEST(JwkSerializerTest, ConvertSpkiFromDerToJwkEc) {
base::StringPiece spki;
base::DictionaryValue public_key_jwk;
EXPECT_FALSE(JwkSerializer::ConvertSpkiFromDerToJwk(spki, &public_key_jwk));
EXPECT_TRUE(public_key_jwk.empty());
// Test the result of a "normal" point on this curve.
spki.set(reinterpret_cast<const char*>(kSpkiEc), sizeof(kSpkiEc));
EXPECT_TRUE(JwkSerializer::ConvertSpkiFromDerToJwk(spki, &public_key_jwk));
std::string string_value;
EXPECT_TRUE(public_key_jwk.GetString("kty", &string_value));
EXPECT_STREQ("EC", string_value.c_str());
EXPECT_TRUE(public_key_jwk.GetString("crv", &string_value));
EXPECT_STREQ("P-256", string_value.c_str());
EXPECT_TRUE(public_key_jwk.GetString("x", &string_value));
EXPECT_FALSE(ContainsNonUrlSafeBase64Characters(string_value));
std::string decoded_coordinate;
EXPECT_TRUE(base::Base64UrlDecode(
string_value, base::Base64UrlDecodePolicy::DISALLOW_PADDING,
&decoded_coordinate));
EXPECT_EQ(kEcCoordinateSize, decoded_coordinate.size());
EXPECT_EQ(
0, memcmp(decoded_coordinate.data(),
kSpkiEc + sizeof(kP256SpkiPrefix), kEcCoordinateSize));
EXPECT_TRUE(public_key_jwk.GetString("y", &string_value));
EXPECT_FALSE(ContainsNonUrlSafeBase64Characters(string_value));
EXPECT_TRUE(base::Base64UrlDecode(
string_value, base::Base64UrlDecodePolicy::DISALLOW_PADDING,
&decoded_coordinate));
EXPECT_EQ(kEcCoordinateSize, decoded_coordinate.size());
EXPECT_EQ(
0, memcmp(decoded_coordinate.data(),
kSpkiEc + sizeof(kP256SpkiPrefix) + kEcCoordinateSize,
kEcCoordinateSize));
// Test the result of a corner case: leading 0s in the x, y coordinates are
// not trimmed, but the point is fixed-length encoded.
spki.set(reinterpret_cast<const char*>(kSpkiEcWithLeadingZero),
sizeof(kSpkiEcWithLeadingZero));
EXPECT_TRUE(JwkSerializer::ConvertSpkiFromDerToJwk(spki, &public_key_jwk));
EXPECT_TRUE(public_key_jwk.GetString("kty", &string_value));
EXPECT_STREQ("EC", string_value.c_str());
EXPECT_TRUE(public_key_jwk.GetString("crv", &string_value));
EXPECT_STREQ("P-256", string_value.c_str());
EXPECT_TRUE(public_key_jwk.GetString("x", &string_value));
EXPECT_FALSE(ContainsNonUrlSafeBase64Characters(string_value));
EXPECT_TRUE(base::Base64UrlDecode(
string_value, base::Base64UrlDecodePolicy::DISALLOW_PADDING,
&decoded_coordinate));
EXPECT_EQ(kEcCoordinateSize, decoded_coordinate.size());
EXPECT_EQ(0, memcmp(decoded_coordinate.data(),
kSpkiEcWithLeadingZero + sizeof(kP256SpkiPrefix),
kEcCoordinateSize));
EXPECT_TRUE(public_key_jwk.GetString("y", &string_value));
EXPECT_FALSE(ContainsNonUrlSafeBase64Characters(string_value));
EXPECT_TRUE(base::Base64UrlDecode(
string_value, base::Base64UrlDecodePolicy::DISALLOW_PADDING,
&decoded_coordinate));
EXPECT_EQ(kEcCoordinateSize, decoded_coordinate.size());
EXPECT_EQ(0, memcmp(decoded_coordinate.data(),
kSpkiEcWithLeadingZero +
sizeof(kP256SpkiPrefix) + kEcCoordinateSize,
kEcCoordinateSize));
}
} // namespace net