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Enable Hybrid PQ KeyShares by default #2531

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Enable Hybrid PQ KeyShares by default #2531

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4fac704
Enable X25519MLKEM768 by default
alexw91 Jun 27, 2025
df14797
Address CR comments
alexw91 Jul 9, 2025
c260e9a
Add remaining PQ Groups
alexw91 Jul 9, 2025
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3 changes: 3 additions & 0 deletions ssl/extensions.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -307,6 +307,9 @@ bool ssl_client_hello_get_extension(const SSL_CLIENT_HELLO *client_hello,
}

static const uint16_t kDefaultGroups[] = {
SSL_GROUP_X25519_MLKEM768,
SSL_GROUP_SECP256R1_MLKEM768,
SSL_GROUP_SECP384R1_MLKEM1024,
SSL_GROUP_X25519,
SSL_GROUP_SECP256R1,
SSL_GROUP_SECP384R1,
Expand Down
1 change: 1 addition & 0 deletions ssl/ssl_encoding_test.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -342,6 +342,7 @@ static size_t GetClientHelloLen(uint16_t max_version, uint16_t session_version,
bssl::UniquePtr<SSL> ssl(SSL_new(ctx.get()));
if (!ssl || !SSL_set_session(ssl.get(), session.get()) ||
!SSL_set_strict_cipher_list(ssl.get(), "ECDHE-RSA-AES128-GCM-SHA256") ||
!SSL_set1_curves_list(ssl.get(), "x25519:P-256:P-384") ||
!SSL_set_max_proto_version(ssl.get(), max_version)) {
return 0;
}
Expand Down
132 changes: 122 additions & 10 deletions ssl/ssl_test.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@
#include <openssl/x509.h>

#include "../crypto/fipsmodule/ec/internal.h"
#include "../crypto/fipsmodule/ml_kem/ml_kem.h"
#include "../crypto/internal.h"
#include "../crypto/kyber/kem_kyber.h"
#include "../crypto/test/file_util.h"
Expand Down Expand Up @@ -615,7 +616,7 @@ TEST(SSLTest, ClientHello) {
0x12, 0x04, 0x03, 0x08, 0x04, 0x04, 0x01, 0x05, 0x03, 0x08, 0x05, 0x05,
0x01, 0x08, 0x06, 0x06, 0x01, 0x02, 0x01}},
{TLS1_3_VERSION,
{0x16, 0x03, 0x01, 0x00, 0xe9, 0x01, 0x00, 0x00, 0xe5, 0x03, 0x03, 0x00,
{0x16, 0x03, 0x01, 0x05, 0xb3, 0x01, 0x00, 0x05, 0xaf, 0x03, 0x03, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
Expand All @@ -625,16 +626,118 @@ TEST(SSLTest, ClientHello) {
0xcc, 0xa9, 0xcc, 0xa8, 0xc0, 0x2b, 0xc0, 0x2f, 0xc0, 0x2c, 0xc0, 0x30,
0xc0, 0x09, 0xc0, 0x13, 0xc0, 0x27, 0xc0, 0x0a, 0xc0, 0x14, 0xc0, 0x28,
0x00, 0x9c, 0x00, 0x9d, 0x00, 0x2f, 0x00, 0x3c, 0x00, 0x35, 0x01, 0x00,
0x00, 0x74, 0x00, 0x17, 0x00, 0x00, 0xff, 0x01, 0x00, 0x01, 0x00, 0x00,
0x0a, 0x00, 0x08, 0x00, 0x06, 0x00, 0x1d, 0x00, 0x17, 0x00, 0x18, 0x00,
0x0b, 0x00, 0x02, 0x01, 0x00, 0x00, 0x23, 0x00, 0x00, 0x00, 0x0d, 0x00,
0x14, 0x00, 0x12, 0x04, 0x03, 0x08, 0x04, 0x04, 0x01, 0x05, 0x03, 0x08,
0x05, 0x05, 0x01, 0x08, 0x06, 0x06, 0x01, 0x02, 0x01, 0x00, 0x33, 0x00,
0x26, 0x00, 0x24, 0x00, 0x1d, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00,
0x05, 0x3e, 0x00, 0x17, 0x00, 0x00, 0xff, 0x01, 0x00, 0x01, 0x00, 0x00,
0x0a, 0x00, 0x0e, 0x00, 0x0c, 0x11, 0xec, 0x11, 0xeb, 0x11, 0xed, 0x00,
0x1d, 0x00, 0x17, 0x00, 0x18, 0x00, 0x0b, 0x00, 0x02, 0x01, 0x00, 0x00,
0x23, 0x00, 0x00, 0x00, 0x0d, 0x00, 0x14, 0x00, 0x12, 0x04, 0x03, 0x08,
0x04, 0x04, 0x01, 0x05, 0x03, 0x08, 0x05, 0x05, 0x01, 0x08, 0x06, 0x06,
0x01, 0x02, 0x01, 0x00, 0x33, 0x04, 0xea, 0x04, 0xe8, 0x11, 0xec, 0x04,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x2d, 0x00, 0x02, 0x01, 0x01, 0x00, 0x2b, 0x00,
0x09, 0x08, 0x03, 0x04, 0x03, 0x03, 0x03, 0x02, 0x03, 0x01}}};
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for (const auto &t : kTests) {
SCOPED_TRACE(t.max_version);
Expand Down Expand Up @@ -662,14 +765,23 @@ TEST(SSLTest, ClientHello) {
1 + 3 + // handshake message header
2; // client_version

constexpr size_t kKeyShare1Offset = 193;
constexpr size_t kKeyShare1Size = 32 + MLKEM768_PUBLIC_KEY_BYTES;
constexpr size_t kKeyShare2Offset = kKeyShare1Offset + kKeyShare1Size
+ 2 // KeyShare 2 IANA ID
+ 2; // KeyShare 2 Length
constexpr size_t kKeyShare2Size = 32;

int pre = client_hello.size();
if (t.max_version == TLS1_3_VERSION) {
ASSERT_GE(client_hello.size(),
kRandomOffset + SSL3_RANDOM_SIZE + 1 + SSL3_SESSION_ID_SIZE);
OPENSSL_memset(client_hello.data() + kRandomOffset, 0,
SSL3_RANDOM_SIZE + 1 + SSL3_SESSION_ID_SIZE);
// Jump to key share extension and zero out the key
OPENSSL_memset(client_hello.data() + 187, 0, 32);
OPENSSL_memset(client_hello.data() + kKeyShare1Offset, 0, kKeyShare1Size);
OPENSSL_memset(client_hello.data() + kKeyShare2Offset, 0, kKeyShare2Size);

} else {
ASSERT_GE(client_hello.size(), kRandomOffset + SSL3_RANDOM_SIZE);
OPENSSL_memset(client_hello.data() + kRandomOffset, 0, SSL3_RANDOM_SIZE);
Expand Down
24 changes: 23 additions & 1 deletion ssl/ssl_version_test.cc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2328,7 +2328,29 @@ TEST_P(SSLVersionTest, PeerTmpKey) {
GTEST_SKIP();
}

// Default should be using X5519 as the key exchange.

ASSERT_TRUE(Connect());
for (SSL *ssl : {client_.get(), server_.get()}) {
SCOPED_TRACE(SSL_is_server(ssl) ? "server" : "client");
EVP_PKEY *key = nullptr;

if (getVersionParam().version == TLS1_3_VERSION) {
// TLS 1.3 default should be using X25519MLKEM768 as the key exchange.
// We expect SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE because there is no EVP_PKEY type
// for hybrid keys, only individual X25519 or MLKEM768 keys.
ERR_clear_error();
EXPECT_FALSE(SSL_get_peer_tmp_key(ssl, &key));
ErrorEquals(ERR_get_error(), ERR_LIB_SSL, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
} else {
// Otherwise x25519 should be used
EXPECT_TRUE(SSL_get_peer_tmp_key(ssl, &key));
EXPECT_EQ(EVP_PKEY_id(key), EVP_PKEY_X25519);
bssl::UniquePtr<EVP_PKEY> pkey(key);
}
}

// Check that x25519 works.
ASSERT_TRUE(SSL_CTX_set1_groups_list(server_ctx_.get(), "x25519"));
ASSERT_TRUE(Connect());
for (SSL *ssl : {client_.get(), server_.get()}) {
SCOPED_TRACE(SSL_is_server(ssl) ? "server" : "client");
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8 changes: 6 additions & 2 deletions ssl/test/runner/runner.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8697,8 +8697,12 @@ func addExtensionTests() {
},
// This hostname just needs to be long enough to push the
// ClientHello into F5's danger zone between 256 and 511 bytes
// long.
flags: []string{"-host-name", "01234567890123456789012345678901234567890123456789012345678901234567890123456789.com"},
// long. Also override curves to just x25519 to remove any PQ
// KeyShares that might push ClientHello above 512 bytes.
flags: []string{
"-host-name", "01234567890123456789012345678901234567890123456789012345678901234567890123456789.com",
"-curves", strconv.Itoa(int(CurveX25519)),
},
})

// Test that illegal extensions in TLS 1.3 are rejected by the client if
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