Implement the X-Wing KEM as drafted in
https://datatracker.ietf.org/doc/html/draft-connolly-cfrg-xwing-kem-07.
In this commit, the API only uses encoded public and private keys. More
efficient in-memory key objects (that avoid repeating computation) can
be added in a later commit.
Change-Id: I1a6082f777adf5e0f68ce6dcdca1d695ddaef449
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/78947
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
diff --git a/build.json b/build.json
index f870d2f..641e0d4 100644
--- a/build.json
+++ b/build.json
@@ -404,7 +404,8 @@
"crypto/x509/x_spki.cc",
"crypto/x509/x_val.cc",
"crypto/x509/x_x509.cc",
- "crypto/x509/x_x509a.cc"
+ "crypto/x509/x_x509a.cc",
+ "crypto/xwing/xwing.cc"
],
"hdrs": [
"include/openssl/aead.h",
@@ -494,7 +495,8 @@
"include/openssl/x509.h",
"include/openssl/x509_vfy.h",
"include/openssl/x509v3.h",
- "include/openssl/x509v3_errors.h"
+ "include/openssl/x509v3_errors.h",
+ "include/openssl/xwing.h"
],
"internal_hdrs": [
"crypto/asn1/internal.h",
@@ -878,7 +880,8 @@
"crypto/thread_test.cc",
"crypto/trust_token/trust_token_test.cc",
"crypto/x509/x509_test.cc",
- "crypto/x509/x509_time_test.cc"
+ "crypto/x509/x509_time_test.cc",
+ "crypto/xwing/xwing_test.cc"
],
"data": [
"crypto/blake2/blake2b256_tests.txt",
diff --git a/crypto/fipsmodule/keccak/internal.h b/crypto/fipsmodule/keccak/internal.h
index 273e666..ba76af9 100644
--- a/crypto/fipsmodule/keccak/internal.h
+++ b/crypto/fipsmodule/keccak/internal.h
@@ -37,6 +37,7 @@
struct BORINGSSL_keccak_st {
enum boringssl_keccak_config_t config;
enum boringssl_keccak_phase_t phase;
+ size_t required_out_len;
uint64_t state[25];
size_t rate_bytes;
size_t absorb_offset;
@@ -50,8 +51,10 @@
const uint8_t *in, size_t in_len,
enum boringssl_keccak_config_t config);
-// BORINGSSL_keccak_init prepares |ctx| for absorbing. The |config| must specify
-// a SHAKE variant, otherwise callers should use |BORINGSSL_keccak|.
+// BORINGSSL_keccak_init prepares |ctx| for absorbing. If the |config| specifies
+// a fixed-output function, like SHA3-256, then the output must be squeezed in a
+// single call to |BORINGSSL_keccak_squeeze|. In that case, it is recommended to
+// use |BORINGSSL_keccak| if the input can be absorbed in a single call.
OPENSSL_EXPORT void BORINGSSL_keccak_init(
struct BORINGSSL_keccak_st *ctx, enum boringssl_keccak_config_t config);
@@ -59,7 +62,10 @@
OPENSSL_EXPORT void BORINGSSL_keccak_absorb(struct BORINGSSL_keccak_st *ctx,
const uint8_t *in, size_t in_len);
-// BORINGSSL_keccak_squeeze writes |out_len| bytes to |out| from |ctx|.
+// BORINGSSL_keccak_squeeze writes |out_len| bytes to |out| from |ctx|. If the
+// configuration previously passed in |BORINGSSL_keccak_init| specifies a
+// fixed-output function, then a single call to |BORINGSSL_keccak_squeeze| is
+// allowed, where |out_len| must be the correct length for that function.
OPENSSL_EXPORT void BORINGSSL_keccak_squeeze(struct BORINGSSL_keccak_st *ctx,
uint8_t *out, size_t out_len);
diff --git a/crypto/fipsmodule/keccak/keccak.cc.inc b/crypto/fipsmodule/keccak/keccak.cc.inc
index 0bb8f08..c31dd0e 100644
--- a/crypto/fipsmodule/keccak/keccak.cc.inc
+++ b/crypto/fipsmodule/keccak/keccak.cc.inc
@@ -126,25 +126,25 @@
}
static void keccak_init(struct BORINGSSL_keccak_st *ctx,
- size_t *out_required_out_len,
enum boringssl_keccak_config_t config) {
+ size_t required_out_len;
size_t capacity_bytes;
switch (config) {
case boringssl_sha3_256:
capacity_bytes = 512 / 8;
- *out_required_out_len = 32;
+ required_out_len = 32;
break;
case boringssl_sha3_512:
capacity_bytes = 1024 / 8;
- *out_required_out_len = 64;
+ required_out_len = 64;
break;
case boringssl_shake128:
capacity_bytes = 256 / 8;
- *out_required_out_len = 0;
+ required_out_len = 0;
break;
case boringssl_shake256:
capacity_bytes = 512 / 8;
- *out_required_out_len = 0;
+ required_out_len = 0;
break;
default:
abort();
@@ -153,6 +153,7 @@
OPENSSL_memset(ctx, 0, sizeof(*ctx));
ctx->config = config;
ctx->phase = boringssl_keccak_phase_absorb;
+ ctx->required_out_len = required_out_len;
ctx->rate_bytes = 200 - capacity_bytes;
assert(ctx->rate_bytes % 8 == 0);
}
@@ -160,9 +161,8 @@
void BORINGSSL_keccak(uint8_t *out, size_t out_len, const uint8_t *in,
size_t in_len, enum boringssl_keccak_config_t config) {
struct BORINGSSL_keccak_st ctx;
- size_t required_out_len;
- keccak_init(&ctx, &required_out_len, config);
- if (required_out_len != 0 && out_len != required_out_len) {
+ keccak_init(&ctx, config);
+ if (ctx.required_out_len != 0 && out_len != ctx.required_out_len) {
abort();
}
BORINGSSL_keccak_absorb(&ctx, in, in_len);
@@ -171,11 +171,7 @@
void BORINGSSL_keccak_init(struct BORINGSSL_keccak_st *ctx,
enum boringssl_keccak_config_t config) {
- size_t required_out_len;
- keccak_init(ctx, &required_out_len, config);
- if (required_out_len != 0) {
- abort();
- }
+ keccak_init(ctx, config);
}
void BORINGSSL_keccak_absorb(struct BORINGSSL_keccak_st *ctx, const uint8_t *in,
@@ -252,6 +248,14 @@
void BORINGSSL_keccak_squeeze(struct BORINGSSL_keccak_st *ctx, uint8_t *out,
size_t out_len) {
+ if (ctx->required_out_len != 0 &&
+ (ctx->phase == boringssl_keccak_phase_squeeze ||
+ out_len != ctx->required_out_len)) {
+ // The SHA-3 variants must be squeezed in a single call, to confirm that the
+ // output length is correct.
+ abort();
+ }
+
if (ctx->phase == boringssl_keccak_phase_absorb) {
keccak_finalize(ctx);
ctx->phase = boringssl_keccak_phase_squeeze;
diff --git a/crypto/xwing/xwing.cc b/crypto/xwing/xwing.cc
new file mode 100644
index 0000000..3572059
--- /dev/null
+++ b/crypto/xwing/xwing.cc
@@ -0,0 +1,189 @@
+// Copyright 2025 The BoringSSL Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <openssl/xwing.h>
+
+#include <openssl/bytestring.h>
+#include <openssl/curve25519.h>
+#include <openssl/mlkem.h>
+#include <openssl/rand.h>
+
+#include "../fipsmodule/bcm_interface.h"
+#include "../fipsmodule/keccak/internal.h"
+#include "../internal.h"
+
+int XWING_generate_key(
+ uint8_t out_encoded_public_key[XWING_PUBLIC_KEY_BYTES],
+ uint8_t out_encoded_private_key[XWING_PRIVATE_KEY_BYTES]) {
+ RAND_bytes(out_encoded_private_key, XWING_PRIVATE_KEY_BYTES);
+ return XWING_public_from_private(out_encoded_public_key,
+ out_encoded_private_key);
+}
+
+int XWING_public_from_private(
+ uint8_t out_encoded_public_key[XWING_PUBLIC_KEY_BYTES],
+ const uint8_t encoded_private_key[XWING_PRIVATE_KEY_BYTES]) {
+ uint8_t expanded_seed[96];
+ BORINGSSL_keccak(expanded_seed, sizeof(expanded_seed), encoded_private_key,
+ XWING_PRIVATE_KEY_BYTES, boringssl_shake256);
+
+ CBB cbb;
+ if (!CBB_init_fixed(&cbb, out_encoded_public_key, XWING_PUBLIC_KEY_BYTES)) {
+ return 0;
+ }
+
+ // ML-KEM-768
+ MLKEM768_private_key mlkem_private_key;
+ MLKEM768_private_key_from_seed(&mlkem_private_key, expanded_seed, 64);
+ MLKEM768_public_key mlkem_public_key;
+ MLKEM768_public_from_private(&mlkem_public_key, &mlkem_private_key);
+
+ if (!MLKEM768_marshal_public_key(&cbb, &mlkem_public_key)) {
+ return 0;
+ }
+
+ // X25519
+ uint8_t *buf;
+ if (!CBB_add_space(&cbb, &buf, 32)) {
+ return 0;
+ }
+ X25519_public_from_private(buf, expanded_seed + 64);
+
+ if (CBB_len(&cbb) != XWING_PUBLIC_KEY_BYTES) {
+ return 0;
+ }
+ return 1;
+}
+
+static void xwing_combiner(
+ uint8_t out_shared_secret[XWING_SHARED_SECRET_BYTES],
+ const uint8_t mlkem_shared_secret[MLKEM_SHARED_SECRET_BYTES],
+ const uint8_t x25519_shared_secret[32], const uint8_t x25519_ciphertext[32],
+ const uint8_t x25519_public_key[32]) {
+ struct BORINGSSL_keccak_st context;
+ BORINGSSL_keccak_init(&context, boringssl_sha3_256);
+
+ BORINGSSL_keccak_absorb(&context, mlkem_shared_secret,
+ MLKEM_SHARED_SECRET_BYTES);
+ BORINGSSL_keccak_absorb(&context, x25519_shared_secret, 32);
+ BORINGSSL_keccak_absorb(&context, x25519_ciphertext, 32);
+ BORINGSSL_keccak_absorb(&context, x25519_public_key, 32);
+
+ uint8_t xwing_label[6] = {0x5c, 0x2e, 0x2f, 0x2f, 0x5e, 0x5c};
+ BORINGSSL_keccak_absorb(&context, xwing_label, sizeof(xwing_label));
+
+ BORINGSSL_keccak_squeeze(&context, out_shared_secret,
+ XWING_SHARED_SECRET_BYTES);
+}
+
+int XWING_encap(uint8_t out_ciphertext[XWING_CIPHERTEXT_BYTES],
+ uint8_t out_shared_secret[XWING_SHARED_SECRET_BYTES],
+ const uint8_t encoded_public_key[XWING_PUBLIC_KEY_BYTES]) {
+ uint8_t eseed[64];
+ RAND_bytes(eseed, sizeof(eseed));
+
+ return XWING_encap_external_entropy(out_ciphertext, out_shared_secret,
+ encoded_public_key, eseed);
+}
+
+int XWING_encap_external_entropy(
+ uint8_t out_ciphertext[XWING_CIPHERTEXT_BYTES],
+ uint8_t out_shared_secret[XWING_SHARED_SECRET_BYTES],
+ const uint8_t encoded_public_key[XWING_PUBLIC_KEY_BYTES],
+ const uint8_t eseed[64]) {
+ // X25519
+ const uint8_t *x25519_public_key =
+ encoded_public_key + MLKEM768_PUBLIC_KEY_BYTES;
+ const uint8_t *x25519_ephemeral_private_key = eseed + 32;
+ uint8_t *x25519_ciphertext = out_ciphertext + MLKEM768_CIPHERTEXT_BYTES;
+ X25519_public_from_private(x25519_ciphertext, x25519_ephemeral_private_key);
+
+ uint8_t x25519_shared_secret[32];
+ if (!X25519(x25519_shared_secret, x25519_ephemeral_private_key,
+ x25519_public_key)) {
+ return 0;
+ }
+
+ // ML-KEM-768
+ const uint8_t *mlkem_encoded_public_key = encoded_public_key;
+ CBS cbs;
+ CBS_init(&cbs, mlkem_encoded_public_key, XWING_PUBLIC_KEY_BYTES);
+
+ CBS mlkem_cbs;
+ if (!CBS_get_bytes(&cbs, &mlkem_cbs, MLKEM768_PUBLIC_KEY_BYTES)) {
+ return 0;
+ }
+
+ BCM_mlkem768_public_key mlkem_public_key;
+ if (!bcm_success(
+ BCM_mlkem768_parse_public_key(&mlkem_public_key, &mlkem_cbs))) {
+ return 0;
+ }
+
+ uint8_t *mlkem_ciphertext = out_ciphertext;
+ uint8_t mlkem_shared_secret[MLKEM_SHARED_SECRET_BYTES];
+ BCM_mlkem768_encap_external_entropy(mlkem_ciphertext, mlkem_shared_secret,
+ &mlkem_public_key, eseed);
+
+ // Combine the shared secrets
+ xwing_combiner(out_shared_secret, mlkem_shared_secret, x25519_shared_secret,
+ x25519_ciphertext, x25519_public_key);
+ return 1;
+}
+
+int XWING_decap(uint8_t out_shared_secret[XWING_SHARED_SECRET_BYTES],
+ const uint8_t ciphertext[XWING_CIPHERTEXT_BYTES],
+ const uint8_t encoded_private_key[XWING_PRIVATE_KEY_BYTES]) {
+ uint8_t expanded_seed[96];
+ BORINGSSL_keccak(expanded_seed, sizeof(expanded_seed), encoded_private_key,
+ XWING_PRIVATE_KEY_BYTES, boringssl_shake256);
+
+ // Define these upfront so that they don't cross a goto.
+ const uint8_t *x25519_ciphertext = ciphertext + MLKEM768_CIPHERTEXT_BYTES;
+ const uint8_t *x25519_private_key = expanded_seed + 64;
+
+ // ML-KEM-768
+ MLKEM768_private_key mlkem_private_key;
+ MLKEM768_private_key_from_seed(&mlkem_private_key, expanded_seed, 64);
+
+ const uint8_t *mlkem_ciphertext = ciphertext;
+ uint8_t mlkem_shared_secret[MLKEM_SHARED_SECRET_BYTES];
+ if (!MLKEM768_decap(mlkem_shared_secret, mlkem_ciphertext,
+ MLKEM768_CIPHERTEXT_BYTES, &mlkem_private_key)) {
+ goto error;
+ }
+
+ // X25519
+ uint8_t x25519_public_key[32];
+ X25519_public_from_private(x25519_public_key, x25519_private_key);
+
+ uint8_t x25519_shared_secret[32];
+ if (!X25519(x25519_shared_secret, x25519_private_key, x25519_ciphertext)) {
+ goto error;
+ }
+
+ // Combine the shared secrets
+ xwing_combiner(out_shared_secret, mlkem_shared_secret, x25519_shared_secret,
+ x25519_ciphertext, x25519_public_key);
+ return 1;
+
+error:
+ // In case of error, fill the shared secret with random bytes so that if the
+ // caller forgets to check the return code:
+ // - no intermediate information leaks,
+ // - the shared secret is unpredictable, so for example any data encrypted
+ // with it wouldn't be trivially decryptable by an attacker.
+ RAND_bytes(out_shared_secret, XWING_SHARED_SECRET_BYTES);
+ return 0;
+}
diff --git a/crypto/xwing/xwing_test.cc b/crypto/xwing/xwing_test.cc
new file mode 100644
index 0000000..f077ddd
--- /dev/null
+++ b/crypto/xwing/xwing_test.cc
@@ -0,0 +1,283 @@
+// Copyright 2025 The BoringSSL Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <gtest/gtest.h>
+
+#include <openssl/xwing.h>
+
+#include "../test/test_util.h"
+
+namespace {
+
+TEST(XWingTest, EncapsulateDecapsulate) {
+ uint8_t public_key[1216];
+ uint8_t private_key[32];
+ ASSERT_TRUE(XWING_generate_key(public_key, private_key));
+
+ uint8_t ciphertext[1120];
+ uint8_t shared_secret[32];
+ ASSERT_TRUE(XWING_encap(ciphertext, shared_secret, public_key));
+
+ uint8_t decapsulated[32];
+ ASSERT_TRUE(XWING_decap(decapsulated, ciphertext, private_key));
+ EXPECT_EQ(Bytes(decapsulated), Bytes(shared_secret));
+}
+
+TEST(XWingTest, PublicFromPrivate) {
+ uint8_t public_key[1216];
+ uint8_t private_key[32];
+ ASSERT_TRUE(XWING_generate_key(public_key, private_key));
+
+ uint8_t public_key2[1216];
+ ASSERT_TRUE(XWING_public_from_private(public_key2, private_key));
+ EXPECT_EQ(Bytes(public_key2), Bytes(public_key));
+}
+
+TEST(XWingTest, TestVector) {
+ // Taken from
+ // https://datatracker.ietf.org/doc/html/draft-connolly-cfrg-xwing-kem-06,
+ // Appendix C.
+ const uint8_t kPrivateKey[32] = {
+ 0x7f, 0x9c, 0x2b, 0xa4, 0xe8, 0x8f, 0x82, 0x7d, 0x61, 0x60, 0x45,
+ 0x50, 0x76, 0x05, 0x85, 0x3e, 0xd7, 0x3b, 0x80, 0x93, 0xf6, 0xef,
+ 0xbc, 0x88, 0xeb, 0x1a, 0x6e, 0xac, 0xfa, 0x66, 0xef, 0x26};
+ const uint8_t kExpectedPublicKey[1216] = {
+ 0xe2, 0x23, 0x6b, 0x35, 0xa8, 0xc2, 0x4b, 0x39, 0xb1, 0x0a, 0xa1, 0x32,
+ 0x3a, 0x96, 0xa9, 0x19, 0xa2, 0xce, 0xd8, 0x84, 0x00, 0x63, 0x3a, 0x7b,
+ 0x07, 0x13, 0x17, 0x13, 0xfc, 0x14, 0xb2, 0xb5, 0xb1, 0x9c, 0xfc, 0x3d,
+ 0xa5, 0xfa, 0x1a, 0x92, 0xc4, 0x9f, 0x25, 0x51, 0x3e, 0x0f, 0xd3, 0x0d,
+ 0x6b, 0x16, 0x11, 0xc9, 0xab, 0x96, 0x35, 0xd7, 0x08, 0x67, 0x27, 0xa4,
+ 0xb7, 0xd2, 0x1d, 0x34, 0x24, 0x4e, 0x66, 0x96, 0x9c, 0xf1, 0x5b, 0x3b,
+ 0x2a, 0x78, 0x53, 0x29, 0xf6, 0x1b, 0x09, 0x6b, 0x27, 0x7e, 0xa0, 0x37,
+ 0x38, 0x34, 0x79, 0xa6, 0xb5, 0x56, 0xde, 0x72, 0x31, 0xfe, 0x4b, 0x7f,
+ 0xa9, 0xc9, 0xac, 0x24, 0xc0, 0x69, 0x9a, 0x00, 0x18, 0xa5, 0x25, 0x34,
+ 0x01, 0xba, 0xcf, 0xa9, 0x05, 0xca, 0x81, 0x65, 0x73, 0xe5, 0x6a, 0x2d,
+ 0x2e, 0x06, 0x7e, 0x9b, 0x72, 0x87, 0x53, 0x3b, 0xa1, 0x3a, 0x93, 0x7d,
+ 0xed, 0xb3, 0x1f, 0xa4, 0x4b, 0xac, 0xed, 0x40, 0x76, 0x99, 0x23, 0x61,
+ 0x00, 0x34, 0xae, 0x31, 0xe6, 0x19, 0xa1, 0x70, 0x24, 0x51, 0x99, 0xb3,
+ 0xc5, 0xc3, 0x98, 0x64, 0x85, 0x9f, 0xe1, 0xb4, 0xc9, 0x71, 0x7a, 0x07,
+ 0xc3, 0x04, 0x95, 0xbd, 0xfb, 0x98, 0xa0, 0xa0, 0x02, 0xcc, 0xf5, 0x6c,
+ 0x12, 0x86, 0xce, 0xf5, 0x04, 0x1d, 0xed, 0xe3, 0xc4, 0x4c, 0xf1, 0x6b,
+ 0xf5, 0x62, 0xc7, 0x44, 0x85, 0x18, 0x02, 0x6b, 0x3d, 0x8b, 0x99, 0x40,
+ 0x68, 0x0a, 0xbd, 0x38, 0xa1, 0x57, 0x5f, 0xd2, 0x7b, 0x58, 0xda, 0x06,
+ 0x3b, 0xfa, 0xc3, 0x2c, 0x39, 0xc3, 0x08, 0x69, 0x37, 0x4c, 0x05, 0xc1,
+ 0xae, 0xb1, 0x89, 0x8b, 0x6b, 0x30, 0x3c, 0xc6, 0x8b, 0xe4, 0x55, 0x34,
+ 0x6e, 0xe0, 0xaf, 0x69, 0x96, 0x36, 0x22, 0x4a, 0x14, 0x8c, 0xa2, 0xae,
+ 0xa1, 0x04, 0x63, 0x11, 0x1c, 0x70, 0x9f, 0x69, 0xb6, 0x9c, 0x70, 0xce,
+ 0x85, 0x38, 0x74, 0x66, 0x98, 0xc4, 0xc6, 0x0a, 0x9a, 0xef, 0x00, 0x30,
+ 0xc7, 0x92, 0x4c, 0xee, 0xc4, 0x2a, 0x5d, 0x36, 0x81, 0x6f, 0x54, 0x5e,
+ 0xae, 0x13, 0x29, 0x34, 0x60, 0xb3, 0xac, 0xb3, 0x7e, 0xa0, 0xe1, 0x3d,
+ 0x70, 0xe4, 0xaa, 0x78, 0x68, 0x6d, 0xa3, 0x98, 0xa8, 0x39, 0x7c, 0x08,
+ 0xea, 0xf9, 0x68, 0x82, 0x11, 0x3f, 0xe4, 0xf7, 0xba, 0xd4, 0xda, 0x40,
+ 0xb0, 0x50, 0x1e, 0x1c, 0x75, 0x3e, 0xfe, 0x73, 0x05, 0x3c, 0x87, 0x01,
+ 0x4e, 0x86, 0x61, 0xc3, 0x30, 0x99, 0xaf, 0xe8, 0xbe, 0xde, 0x41, 0x4a,
+ 0x5b, 0x1a, 0xa2, 0x7d, 0x83, 0x92, 0xb3, 0xe1, 0x31, 0xe9, 0xa7, 0x0c,
+ 0x10, 0x55, 0x87, 0x82, 0x40, 0xca, 0xd0, 0xf4, 0x0d, 0x5f, 0xe3, 0xcd,
+ 0xf8, 0x52, 0x36, 0xea, 0xd9, 0x7e, 0x2a, 0x97, 0x44, 0x83, 0x63, 0xb2,
+ 0x80, 0x8c, 0xaa, 0xfd, 0x51, 0x6c, 0xd2, 0x50, 0x52, 0xc5, 0xc3, 0x62,
+ 0x54, 0x3c, 0x25, 0x17, 0xe4, 0xac, 0xd0, 0xe6, 0x0e, 0xc0, 0x71, 0x63,
+ 0x00, 0x9b, 0x64, 0x25, 0xfc, 0x32, 0x27, 0x7a, 0xce, 0xe7, 0x1c, 0x24,
+ 0xba, 0xb5, 0x3e, 0xd9, 0xf2, 0x9e, 0x74, 0xc6, 0x6a, 0x0a, 0x35, 0x64,
+ 0x95, 0x59, 0x98, 0xd7, 0x6b, 0x96, 0xa9, 0xa8, 0xb5, 0x0d, 0x16, 0x35,
+ 0xa4, 0xd7, 0xa6, 0x7e, 0xb4, 0x2d, 0xf5, 0x64, 0x4d, 0x33, 0x04, 0x57,
+ 0x29, 0x3a, 0x80, 0x42, 0xf5, 0x3c, 0xc7, 0xa6, 0x92, 0x88, 0xf1, 0x7e,
+ 0xd5, 0x58, 0x27, 0xe8, 0x2b, 0x28, 0xe8, 0x26, 0x65, 0xa8, 0x6a, 0x14,
+ 0xfb, 0xd9, 0x66, 0x45, 0xec, 0xa8, 0x17, 0x2c, 0x04, 0x4f, 0x83, 0xbc,
+ 0x0d, 0x8c, 0x0b, 0x4c, 0x86, 0x26, 0x98, 0x56, 0x31, 0xca, 0x87, 0xaf,
+ 0x82, 0x90, 0x68, 0xf1, 0x35, 0x89, 0x63, 0xcb, 0x33, 0x36, 0x64, 0xca,
+ 0x48, 0x27, 0x63, 0xba, 0x3b, 0x3b, 0xb2, 0x08, 0x57, 0x7f, 0x9b, 0xa6,
+ 0xac, 0x62, 0xc2, 0x5f, 0x76, 0x59, 0x27, 0x43, 0xb6, 0x4b, 0xe5, 0x19,
+ 0x31, 0x77, 0x14, 0xcb, 0x41, 0x02, 0xcb, 0x7b, 0x2f, 0x9a, 0x25, 0xb2,
+ 0xb4, 0xf0, 0x61, 0x5d, 0xe3, 0x1d, 0xec, 0xd9, 0xca, 0x55, 0x02, 0x6d,
+ 0x6d, 0xa0, 0xb6, 0x51, 0x11, 0xb1, 0x6f, 0xe5, 0x2f, 0xee, 0xd8, 0xa4,
+ 0x87, 0xe1, 0x44, 0x46, 0x2a, 0x6d, 0xba, 0x93, 0x72, 0x8f, 0x50, 0x0b,
+ 0x6f, 0xfc, 0x49, 0xe5, 0x15, 0x56, 0x9e, 0xf2, 0x5f, 0xed, 0x17, 0xaf,
+ 0xf5, 0x20, 0x50, 0x73, 0x68, 0x25, 0x35, 0x25, 0x86, 0x0f, 0x58, 0xbe,
+ 0x3b, 0xe6, 0x1c, 0x96, 0x46, 0x04, 0xa6, 0xac, 0x81, 0x4e, 0x69, 0x35,
+ 0x59, 0x64, 0x02, 0xa5, 0x20, 0xa4, 0x67, 0x0b, 0x3d, 0x28, 0x43, 0x18,
+ 0x86, 0x65, 0x93, 0xd1, 0x5a, 0x4b, 0xb0, 0x1c, 0x35, 0xe3, 0xe5, 0x87,
+ 0xee, 0x0c, 0x67, 0xd2, 0x88, 0x0d, 0x6f, 0x24, 0x07, 0xfb, 0x7a, 0x70,
+ 0x71, 0x2b, 0x83, 0x8d, 0xeb, 0x96, 0xc5, 0xd7, 0xbf, 0x2b, 0x44, 0xbc,
+ 0xf6, 0x03, 0x8c, 0xcb, 0xe3, 0x3f, 0xbc, 0xf5, 0x1a, 0x54, 0xa5, 0x84,
+ 0xfe, 0x90, 0x08, 0x3c, 0x91, 0xc7, 0xa6, 0xd4, 0x3d, 0x4f, 0xb1, 0x5f,
+ 0x48, 0xc6, 0x0c, 0x2f, 0xd6, 0x6e, 0x0a, 0x8a, 0xad, 0x4a, 0xd6, 0x4e,
+ 0x5c, 0x42, 0xbb, 0x88, 0x77, 0xc0, 0xeb, 0xec, 0x2b, 0x5e, 0x38, 0x7c,
+ 0x8a, 0x98, 0x8f, 0xdc, 0x23, 0xbe, 0xb9, 0xe1, 0x6c, 0x87, 0x57, 0x78,
+ 0x1e, 0x0a, 0x14, 0x99, 0xc6, 0x1e, 0x13, 0x8c, 0x21, 0xf2, 0x16, 0xc2,
+ 0x9d, 0x07, 0x69, 0x79, 0x87, 0x1c, 0xaa, 0x69, 0x42, 0xba, 0xfc, 0x09,
+ 0x05, 0x44, 0xbe, 0xe9, 0x9b, 0x54, 0xb1, 0x6c, 0xb9, 0xa9, 0xa3, 0x64,
+ 0xd6, 0x24, 0x6d, 0x9f, 0x42, 0xcc, 0xe5, 0x3c, 0x66, 0xb5, 0x9c, 0x45,
+ 0xc8, 0xf9, 0xae, 0x92, 0x99, 0xa7, 0x5d, 0x15, 0x18, 0x0c, 0x3c, 0x95,
+ 0x21, 0x51, 0xa9, 0x1b, 0x7a, 0x10, 0x77, 0x24, 0x29, 0xdc, 0x4c, 0xba,
+ 0xe6, 0xfc, 0xc6, 0x22, 0xfa, 0x80, 0x18, 0xc6, 0x34, 0x39, 0xf8, 0x90,
+ 0x63, 0x0b, 0x99, 0x28, 0xdb, 0x6b, 0xb7, 0xf9, 0x43, 0x8a, 0xe4, 0x06,
+ 0x5e, 0xd3, 0x4d, 0x73, 0xd4, 0x86, 0xf3, 0xf5, 0x2f, 0x90, 0xf0, 0x80,
+ 0x7d, 0xc8, 0x8d, 0xfd, 0xd8, 0xc7, 0x28, 0xe9, 0x54, 0xf1, 0xac, 0x35,
+ 0xc0, 0x6c, 0x00, 0x0c, 0xe4, 0x1a, 0x05, 0x82, 0x58, 0x0e, 0x3b, 0xb5,
+ 0x7b, 0x67, 0x29, 0x72, 0x89, 0x0a, 0xc5, 0xe7, 0x98, 0x8e, 0x78, 0x50,
+ 0x65, 0x71, 0x16, 0xf1, 0xb5, 0x7d, 0x08, 0x09, 0xaa, 0xed, 0xec, 0x0b,
+ 0xed, 0xe1, 0xae, 0x14, 0x81, 0x48, 0x31, 0x1c, 0x6f, 0x7e, 0x31, 0x73,
+ 0x46, 0xe5, 0x18, 0x9f, 0xb8, 0xcd, 0x63, 0x5b, 0x98, 0x6f, 0x8c, 0x0b,
+ 0xdd, 0x27, 0x64, 0x1c, 0x58, 0x4b, 0x77, 0x8b, 0x3a, 0x91, 0x1a, 0x80,
+ 0xbe, 0x1c, 0x96, 0x92, 0xab, 0x8e, 0x1b, 0xbb, 0x12, 0x83, 0x95, 0x73,
+ 0xcc, 0xe1, 0x9d, 0xf1, 0x83, 0xb4, 0x58, 0x35, 0xbb, 0xb5, 0x50, 0x52,
+ 0xf9, 0xfc, 0x66, 0xa1, 0x67, 0x8e, 0xf2, 0xa3, 0x6d, 0xea, 0x78, 0x41,
+ 0x1e, 0x6c, 0x8d, 0x60, 0x50, 0x1b, 0x4e, 0x60, 0x59, 0x2d, 0x13, 0x69,
+ 0x8a, 0x94, 0x3b, 0x50, 0x91, 0x85, 0xdb, 0x91, 0x2e, 0x2e, 0xa1, 0x0b,
+ 0xe0, 0x61, 0x71, 0x23, 0x6b, 0x32, 0x7c, 0x71, 0x71, 0x60, 0x94, 0xc9,
+ 0x64, 0xa6, 0x8b, 0x03, 0x37, 0x7f, 0x51, 0x3a, 0x05, 0xbc, 0xd9, 0x9c,
+ 0x1f, 0x34, 0x65, 0x83, 0xbb, 0x05, 0x29, 0x77, 0xa1, 0x0a, 0x12, 0xad,
+ 0xfc, 0x75, 0x80, 0x34, 0xe5, 0x61, 0x7d, 0xa4, 0xc1, 0x27, 0x65, 0x85,
+ 0xe5, 0x77, 0x4e, 0x1f, 0x3b, 0x99, 0x78, 0xb0, 0x9d, 0x0e, 0x9c, 0x44,
+ 0xd3, 0xbc, 0x86, 0x15, 0x1c, 0x43, 0xaa, 0xd1, 0x85, 0x71, 0x27, 0x17,
+ 0x34, 0x02, 0x23, 0xac, 0x38, 0x1d, 0x21, 0x15, 0x0a, 0x04, 0x29, 0x4e,
+ 0x97, 0xbb, 0x13, 0xbb, 0xda, 0x21, 0xb5, 0xa1, 0x82, 0xb6, 0xda, 0x96,
+ 0x9e, 0x19, 0xa7, 0xfd, 0x07, 0x27, 0x37, 0xfa, 0x8e, 0x88, 0x0a, 0x53,
+ 0xc2, 0x42, 0x8e, 0x3d, 0x04, 0x9b, 0x7d, 0x21, 0x97, 0x40, 0x52, 0x96,
+ 0xdd, 0xb3, 0x61, 0x91, 0x2a, 0x7b, 0xcf, 0x48, 0x27, 0xce, 0xd6, 0x11,
+ 0xd0, 0xc7, 0xa7, 0xda, 0x10, 0x4d, 0xde, 0x43, 0x22, 0x09, 0x53, 0x39,
+ 0xf6, 0x4a, 0x61, 0xd5, 0xbb, 0x10, 0x8f, 0xf0, 0xbf, 0x4d, 0x78, 0x0c,
+ 0xae, 0x50, 0x9f, 0xb2, 0x2c, 0x25, 0x69, 0x14, 0x19, 0x3f, 0xf7, 0x34,
+ 0x90, 0x42, 0x58, 0x12, 0x37, 0xd5, 0x22, 0x82, 0x88, 0x24, 0xee, 0x3b,
+ 0xdf, 0xd0, 0x7f, 0xb0, 0x3f, 0x1f, 0x94, 0x2d, 0x2e, 0xa1, 0x79, 0xfe,
+ 0x72, 0x2f, 0x06, 0xcc, 0x03, 0xde, 0x5b, 0x69, 0x85, 0x9e, 0xdb, 0x06,
+ 0xef, 0xf3, 0x89, 0xb2, 0x7d, 0xce, 0x59, 0x84, 0x45, 0x70, 0x21, 0x62,
+ 0x23, 0x59, 0x3d, 0x4b, 0xa3, 0x2d, 0x9a, 0xba, 0xc8, 0xcd, 0x04, 0x90,
+ 0x40, 0xef, 0x65, 0x34,
+ };
+ const uint8_t kEphemeralSeed[64] = {
+ 0x3c, 0xb1, 0xee, 0xa9, 0x88, 0x00, 0x4b, 0x93, 0x10, 0x3c, 0xfb,
+ 0x0a, 0xee, 0xfd, 0x2a, 0x68, 0x6e, 0x01, 0xfa, 0x4a, 0x58, 0xe8,
+ 0xa3, 0x63, 0x9c, 0xa8, 0xa1, 0xe3, 0xf9, 0xae, 0x57, 0xe2, 0x35,
+ 0xb8, 0xcc, 0x87, 0x3c, 0x23, 0xdc, 0x62, 0xb8, 0xd2, 0x60, 0x16,
+ 0x9a, 0xfa, 0x2f, 0x75, 0xab, 0x91, 0x6a, 0x58, 0xd9, 0x74, 0x91,
+ 0x88, 0x35, 0xd2, 0x5e, 0x6a, 0x43, 0x50, 0x85, 0xb2,
+ };
+ const uint8_t kExpectedSharedSecret[32] = {
+ 0xd2, 0xdf, 0x05, 0x22, 0x12, 0x8f, 0x09, 0xdd, 0x8e, 0x2c, 0x92,
+ 0xb1, 0xe9, 0x05, 0xc7, 0x93, 0xd8, 0xf5, 0x7a, 0x54, 0xc3, 0xda,
+ 0x25, 0x86, 0x1f, 0x10, 0xbf, 0x4c, 0xa6, 0x13, 0xe3, 0x84};
+ const uint8_t kExpectedCiphertext[1120] = {
+ 0xb8, 0x3a, 0xa8, 0x28, 0xd4, 0xd6, 0x2b, 0x9a, 0x83, 0xce, 0xff, 0xe1,
+ 0xd3, 0xd3, 0xbb, 0x1e, 0xf3, 0x12, 0x64, 0x64, 0x3c, 0x07, 0x0c, 0x57,
+ 0x98, 0x92, 0x7e, 0x41, 0xfb, 0x07, 0x91, 0x4a, 0x27, 0x3f, 0x8f, 0x96,
+ 0xe7, 0x82, 0x6c, 0xd5, 0x37, 0x5a, 0x28, 0x3d, 0x7d, 0xa8, 0x85, 0x30,
+ 0x4c, 0x5d, 0xe0, 0x51, 0x6a, 0x0f, 0x06, 0x54, 0x24, 0x3d, 0xc5, 0xb9,
+ 0x7f, 0x8b, 0xfe, 0xb8, 0x31, 0xf6, 0x82, 0x51, 0x21, 0x9a, 0xab, 0xdd,
+ 0x72, 0x3b, 0xc6, 0x51, 0x20, 0x41, 0xac, 0xba, 0xef, 0x8a, 0xf4, 0x42,
+ 0x65, 0x52, 0x49, 0x42, 0xb9, 0x02, 0xe6, 0x8f, 0xfd, 0x23, 0x22, 0x1c,
+ 0xda, 0x70, 0xb1, 0xb5, 0x5d, 0x77, 0x6a, 0x92, 0xd1, 0x14, 0x3e, 0xa3,
+ 0xa0, 0xc4, 0x75, 0xf6, 0x3e, 0xe6, 0x89, 0x01, 0x57, 0xc7, 0x11, 0x6d,
+ 0xae, 0x3f, 0x62, 0xbf, 0x72, 0xf6, 0x0a, 0xcd, 0x2b, 0xb8, 0xcc, 0x31,
+ 0xce, 0x2b, 0xa0, 0xde, 0x36, 0x4f, 0x52, 0xb8, 0xed, 0x38, 0xc7, 0x9d,
+ 0x71, 0x97, 0x15, 0x96, 0x3a, 0x5d, 0xd3, 0x84, 0x2d, 0x8e, 0x8b, 0x43,
+ 0xab, 0x70, 0x4e, 0x47, 0x59, 0xb5, 0x32, 0x7b, 0xf0, 0x27, 0xc6, 0x3c,
+ 0x8f, 0xa8, 0x57, 0xc4, 0x90, 0x8d, 0x5a, 0x8a, 0x7b, 0x88, 0xac, 0x7f,
+ 0x2b, 0xe3, 0x94, 0xd9, 0x3c, 0x37, 0x06, 0xdd, 0xd4, 0xe6, 0x98, 0xcc,
+ 0x6c, 0xe3, 0x70, 0x10, 0x1f, 0x4d, 0x02, 0x13, 0x25, 0x42, 0x38, 0xb4,
+ 0xa2, 0xe8, 0x82, 0x1b, 0x6e, 0x41, 0x4a, 0x1c, 0xf2, 0x0f, 0x6c, 0x12,
+ 0x44, 0xb6, 0x99, 0x04, 0x6f, 0x5a, 0x01, 0xca, 0xa0, 0xa1, 0xa5, 0x55,
+ 0x16, 0x30, 0x0b, 0x40, 0xd2, 0x04, 0x8c, 0x77, 0xcc, 0x73, 0xaf, 0xba,
+ 0x79, 0xaf, 0xee, 0xa9, 0xd2, 0xc0, 0x11, 0x8b, 0xdf, 0x2a, 0xdb, 0x88,
+ 0x70, 0xdc, 0x32, 0x8c, 0x55, 0x16, 0xcc, 0x45, 0xb1, 0xa2, 0x05, 0x81,
+ 0x41, 0x03, 0x9e, 0x2c, 0x90, 0xa1, 0x10, 0xa9, 0xe1, 0x6b, 0x31, 0x8d,
+ 0xfb, 0x53, 0xbd, 0x49, 0xa1, 0x26, 0xd6, 0xb7, 0x3f, 0x21, 0x57, 0x87,
+ 0x51, 0x7b, 0x89, 0x17, 0xcc, 0x01, 0xca, 0xbd, 0x10, 0x7d, 0x06, 0x85,
+ 0x98, 0x54, 0xee, 0x8b, 0x4f, 0x98, 0x61, 0xc2, 0x26, 0xd3, 0x76, 0x4c,
+ 0x87, 0x33, 0x9a, 0xb1, 0x6c, 0x36, 0x67, 0xd2, 0xf4, 0x93, 0x84, 0xe5,
+ 0x54, 0x56, 0xdd, 0x40, 0x41, 0x4b, 0x70, 0xa6, 0xaf, 0x84, 0x15, 0x85,
+ 0xf4, 0xc9, 0x0c, 0x68, 0x72, 0x5d, 0x57, 0x70, 0x4e, 0xe8, 0xee, 0x7c,
+ 0xe6, 0xe2, 0xf9, 0xbe, 0x58, 0x2d, 0xbe, 0xe9, 0x85, 0xe0, 0x38, 0xff,
+ 0xc3, 0x46, 0xeb, 0xfb, 0x4e, 0x22, 0x15, 0x8b, 0x6c, 0x84, 0x37, 0x4a,
+ 0x9a, 0xb4, 0xa4, 0x4e, 0x1f, 0x91, 0xde, 0x5a, 0xac, 0x51, 0x97, 0xf8,
+ 0x9b, 0xc5, 0xe5, 0x44, 0x2f, 0x51, 0xf9, 0xa5, 0x93, 0x7b, 0x10, 0x2b,
+ 0xa3, 0xbe, 0xae, 0xbf, 0x6e, 0x1c, 0x58, 0x38, 0x0a, 0x4a, 0x5f, 0xed,
+ 0xce, 0x4a, 0x4e, 0x50, 0x26, 0xf8, 0x8f, 0x52, 0x8f, 0x59, 0xff, 0xd2,
+ 0xdb, 0x41, 0x75, 0x2b, 0x3a, 0x3d, 0x90, 0xef, 0xab, 0xe4, 0x63, 0x89,
+ 0x9b, 0x7d, 0x40, 0x87, 0x0c, 0x53, 0x0c, 0x88, 0x41, 0xe8, 0x71, 0x2b,
+ 0x73, 0x36, 0x68, 0xed, 0x03, 0x3a, 0xdb, 0xfa, 0xfb, 0x2d, 0x49, 0xd3,
+ 0x7a, 0x44, 0xd4, 0x06, 0x4e, 0x58, 0x63, 0xeb, 0x0a, 0xf0, 0xa0, 0x8d,
+ 0x47, 0xb3, 0xcc, 0x88, 0x83, 0x73, 0xbc, 0x05, 0xf7, 0xa3, 0x3b, 0x84,
+ 0x1b, 0xc2, 0x58, 0x7c, 0x57, 0xeb, 0x69, 0x55, 0x4e, 0x8a, 0x37, 0x67,
+ 0xb7, 0x50, 0x69, 0x17, 0xb6, 0xb7, 0x04, 0x98, 0x72, 0x7f, 0x16, 0xea,
+ 0xc1, 0xa3, 0x6e, 0xc8, 0xd8, 0xcf, 0xaf, 0x75, 0x15, 0x49, 0xf2, 0x27,
+ 0x7d, 0xb2, 0x77, 0xe8, 0xa5, 0x5a, 0x9a, 0x51, 0x06, 0xb2, 0x3a, 0x02,
+ 0x06, 0xb4, 0x72, 0x1f, 0xa9, 0xb3, 0x04, 0x85, 0x52, 0xc5, 0xbd, 0x5b,
+ 0x59, 0x4d, 0x6e, 0x24, 0x7f, 0x38, 0xc1, 0x8c, 0x59, 0x1a, 0xea, 0x7f,
+ 0x56, 0x24, 0x9c, 0x72, 0xce, 0x7b, 0x11, 0x7a, 0xfc, 0xc3, 0xa8, 0x62,
+ 0x15, 0x82, 0xf9, 0xcf, 0x71, 0x78, 0x7e, 0x18, 0x3d, 0xee, 0x09, 0x36,
+ 0x79, 0x76, 0xe9, 0x84, 0x09, 0xad, 0x92, 0x17, 0xa4, 0x97, 0xdf, 0x88,
+ 0x80, 0x42, 0x38, 0x4d, 0x77, 0x07, 0xa6, 0xb7, 0x8f, 0x5f, 0x7f, 0xb8,
+ 0x40, 0x9e, 0x3b, 0x53, 0x51, 0x75, 0x37, 0x34, 0x61, 0xb7, 0x76, 0x00,
+ 0x2d, 0x79, 0x9c, 0xba, 0xd6, 0x28, 0x60, 0xbe, 0x70, 0x57, 0x3e, 0xcb,
+ 0xe1, 0x3b, 0x24, 0x6e, 0x0d, 0xa7, 0xe9, 0x3a, 0x52, 0x16, 0x8e, 0x0f,
+ 0xb6, 0xa9, 0x75, 0x6b, 0x89, 0x5e, 0xf7, 0xf0, 0x14, 0x7a, 0x0d, 0xc8,
+ 0x1b, 0xfa, 0x64, 0x4b, 0x08, 0x8a, 0x92, 0x28, 0x16, 0x0c, 0x0f, 0x9a,
+ 0xcf, 0x13, 0x79, 0xa2, 0x94, 0x1c, 0xd2, 0x8c, 0x06, 0xeb, 0xc8, 0x0e,
+ 0x44, 0xe1, 0x7a, 0xa2, 0xf8, 0x17, 0x70, 0x10, 0xaf, 0xd7, 0x8a, 0x97,
+ 0xce, 0x08, 0x68, 0xd1, 0x62, 0x9e, 0xbb, 0x29, 0x4c, 0x51, 0x51, 0x81,
+ 0x2c, 0x58, 0x3d, 0xae, 0xb8, 0x86, 0x85, 0x22, 0x0f, 0x4d, 0xa9, 0x11,
+ 0x81, 0x12, 0xe0, 0x70, 0x41, 0xfc, 0xc2, 0x4d, 0x55, 0x64, 0xa9, 0x9f,
+ 0xdb, 0xde, 0x28, 0x86, 0x9f, 0xe0, 0x72, 0x23, 0x87, 0xd7, 0xa9, 0xa4,
+ 0xd1, 0x6e, 0x1c, 0xc8, 0x55, 0x59, 0x17, 0xe0, 0x99, 0x44, 0xaa, 0x5e,
+ 0xba, 0xaa, 0xec, 0x2c, 0xf6, 0x26, 0x93, 0xaf, 0xad, 0x42, 0xa3, 0xf5,
+ 0x18, 0xfc, 0xe6, 0x7d, 0x27, 0x3c, 0xc6, 0xc9, 0xfb, 0x54, 0x72, 0xb3,
+ 0x80, 0xe8, 0x57, 0x3e, 0xc7, 0xde, 0x06, 0xa3, 0xba, 0x2f, 0xd5, 0xf9,
+ 0x31, 0xd7, 0x25, 0xb4, 0x93, 0x02, 0x6c, 0xb0, 0xac, 0xbd, 0x3f, 0xe6,
+ 0x2d, 0x00, 0xe4, 0xc7, 0x90, 0xd9, 0x65, 0xd7, 0xa0, 0x3a, 0x3c, 0x0b,
+ 0x42, 0x22, 0xba, 0x8c, 0x2a, 0x9a, 0x16, 0xe2, 0xac, 0x65, 0x8f, 0x57,
+ 0x2a, 0xe0, 0xe7, 0x46, 0xea, 0xfc, 0x4f, 0xeb, 0xa0, 0x23, 0x57, 0x6f,
+ 0x08, 0x94, 0x22, 0x78, 0xa0, 0x41, 0xfb, 0x82, 0xa7, 0x0a, 0x59, 0x5d,
+ 0x5b, 0xac, 0xbf, 0x29, 0x7c, 0xe2, 0x02, 0x98, 0x98, 0xa7, 0x1e, 0x5c,
+ 0x3b, 0x0d, 0x1c, 0x62, 0x28, 0xb4, 0x85, 0xb1, 0xad, 0xe5, 0x09, 0xb3,
+ 0x5f, 0xbc, 0xa7, 0xec, 0xa9, 0x7b, 0x21, 0x32, 0xe7, 0xcb, 0x6b, 0xc4,
+ 0x65, 0x37, 0x51, 0x46, 0xb7, 0xdc, 0xea, 0xc9, 0x69, 0x30, 0x8a, 0xc0,
+ 0xc2, 0xac, 0x89, 0xe7, 0x86, 0x3e, 0xb8, 0x94, 0x30, 0x15, 0xb2, 0x43,
+ 0x14, 0xca, 0xfb, 0x9c, 0x7c, 0x0e, 0x85, 0xfe, 0x54, 0x3d, 0x56, 0x65,
+ 0x8c, 0x21, 0x36, 0x32, 0x59, 0x9e, 0xfa, 0xbf, 0xc1, 0xec, 0x49, 0xdd,
+ 0x8c, 0x88, 0x54, 0x7b, 0xb2, 0xcc, 0x40, 0xc9, 0xd3, 0x8c, 0xbd, 0x30,
+ 0x99, 0xb4, 0x54, 0x78, 0x40, 0x56, 0x05, 0x31, 0xd0, 0x18, 0x8c, 0xd1,
+ 0xe9, 0xc2, 0x3a, 0x0e, 0xbe, 0xe0, 0xa0, 0x3d, 0x55, 0x77, 0xd6, 0x6b,
+ 0x1d, 0x2b, 0xcb, 0x4b, 0xaa, 0xf2, 0x1c, 0xc7, 0xfe, 0xf1, 0xe0, 0x38,
+ 0x06, 0xca, 0x96, 0x29, 0x9d, 0xf0, 0xdf, 0xbc, 0x56, 0xe1, 0xb2, 0xb4,
+ 0x3e, 0x4f, 0xc2, 0x0c, 0x37, 0xf8, 0x34, 0xc4, 0xaf, 0x62, 0x12, 0x7e,
+ 0x7d, 0xae, 0x86, 0xc3, 0xc2, 0x5a, 0x2f, 0x69, 0x6a, 0xc8, 0xb5, 0x89,
+ 0xde, 0xc7, 0x1d, 0x59, 0x5b, 0xfb, 0xe9, 0x4b, 0x5e, 0xd4, 0xbc, 0x07,
+ 0xd8, 0x00, 0xb3, 0x30, 0x79, 0x6f, 0xda, 0x89, 0xed, 0xb7, 0x7b, 0xe0,
+ 0x29, 0x41, 0x36, 0x13, 0x93, 0x54, 0xeb, 0x8c, 0xd3, 0x75, 0x91, 0x57,
+ 0x8f, 0x9c, 0x60, 0x0d, 0xd9, 0xbe, 0x8e, 0xc6, 0x21, 0x9f, 0xdd, 0x50,
+ 0x7a, 0xdf, 0x33, 0x97, 0xed, 0x4d, 0x68, 0x70, 0x7b, 0x8d, 0x13, 0xb2,
+ 0x4c, 0xe4, 0xcd, 0x8f, 0xb2, 0x28, 0x51, 0xbf, 0xe9, 0xd6, 0x32, 0x40,
+ 0x7f, 0x31, 0xed, 0x6f, 0x7c, 0xb1, 0x60, 0x0d, 0xe5, 0x6f, 0x17, 0x57,
+ 0x67, 0x40, 0xce, 0x2a, 0x32, 0xfc, 0x51, 0x45, 0x03, 0x01, 0x45, 0xcf,
+ 0xb9, 0x7e, 0x63, 0xe0, 0xe4, 0x1d, 0x35, 0x42, 0x74, 0xa0, 0x79, 0xd3,
+ 0xe6, 0xfb, 0x2e, 0x15};
+
+ uint8_t public_key[1216];
+ ASSERT_TRUE(XWING_public_from_private(public_key, kPrivateKey));
+ EXPECT_EQ(Bytes(public_key), Bytes(kExpectedPublicKey));
+
+ uint8_t ciphertext[1120];
+ uint8_t shared_secret[32];
+ ASSERT_TRUE(XWING_encap_external_entropy(ciphertext, shared_secret,
+ public_key, kEphemeralSeed));
+ EXPECT_EQ(Bytes(ciphertext), Bytes(kExpectedCiphertext));
+ EXPECT_EQ(Bytes(shared_secret), Bytes(kExpectedSharedSecret));
+
+ uint8_t decapsulated[32];
+ ASSERT_TRUE(XWING_decap(decapsulated, ciphertext, kPrivateKey));
+ EXPECT_EQ(Bytes(decapsulated), Bytes(shared_secret));
+}
+
+} // namespace
diff --git a/gen/sources.bzl b/gen/sources.bzl
index c0f52c6..6811bc0 100644
--- a/gen/sources.bzl
+++ b/gen/sources.bzl
@@ -504,6 +504,7 @@
"crypto/x509/x_val.cc",
"crypto/x509/x_x509.cc",
"crypto/x509/x_x509a.cc",
+ "crypto/xwing/xwing.cc",
"gen/crypto/err_data.cc",
]
@@ -596,6 +597,7 @@
"include/openssl/x509_vfy.h",
"include/openssl/x509v3.h",
"include/openssl/x509v3_errors.h",
+ "include/openssl/xwing.h",
]
crypto_internal_headers = [
@@ -779,6 +781,7 @@
"crypto/trust_token/trust_token_test.cc",
"crypto/x509/x509_test.cc",
"crypto/x509/x509_time_test.cc",
+ "crypto/xwing/xwing_test.cc",
]
crypto_test_data = [
diff --git a/gen/sources.cmake b/gen/sources.cmake
index 39cd4e4..913bf97 100644
--- a/gen/sources.cmake
+++ b/gen/sources.cmake
@@ -518,6 +518,7 @@
crypto/x509/x_val.cc
crypto/x509/x_x509.cc
crypto/x509/x_x509a.cc
+ crypto/xwing/xwing.cc
gen/crypto/err_data.cc
)
@@ -612,6 +613,7 @@
include/openssl/x509_vfy.h
include/openssl/x509v3.h
include/openssl/x509v3_errors.h
+ include/openssl/xwing.h
)
set(
@@ -803,6 +805,7 @@
crypto/trust_token/trust_token_test.cc
crypto/x509/x509_test.cc
crypto/x509/x509_time_test.cc
+ crypto/xwing/xwing_test.cc
)
set(
diff --git a/gen/sources.gni b/gen/sources.gni
index f4158f9..f2022e6 100644
--- a/gen/sources.gni
+++ b/gen/sources.gni
@@ -504,6 +504,7 @@
"crypto/x509/x_val.cc",
"crypto/x509/x_x509.cc",
"crypto/x509/x_x509a.cc",
+ "crypto/xwing/xwing.cc",
"gen/crypto/err_data.cc",
]
@@ -596,6 +597,7 @@
"include/openssl/x509_vfy.h",
"include/openssl/x509v3.h",
"include/openssl/x509v3_errors.h",
+ "include/openssl/xwing.h",
]
crypto_internal_headers = [
@@ -779,6 +781,7 @@
"crypto/trust_token/trust_token_test.cc",
"crypto/x509/x509_test.cc",
"crypto/x509/x509_time_test.cc",
+ "crypto/xwing/xwing_test.cc",
]
crypto_test_data = [
diff --git a/gen/sources.json b/gen/sources.json
index 80e6199..9184e23 100644
--- a/gen/sources.json
+++ b/gen/sources.json
@@ -488,6 +488,7 @@
"crypto/x509/x_val.cc",
"crypto/x509/x_x509.cc",
"crypto/x509/x_x509a.cc",
+ "crypto/xwing/xwing.cc",
"gen/crypto/err_data.cc"
],
"hdrs": [
@@ -578,7 +579,8 @@
"include/openssl/x509.h",
"include/openssl/x509_vfy.h",
"include/openssl/x509v3.h",
- "include/openssl/x509v3_errors.h"
+ "include/openssl/x509v3_errors.h",
+ "include/openssl/xwing.h"
],
"internal_hdrs": [
"crypto/asn1/internal.h",
@@ -759,7 +761,8 @@
"crypto/thread_test.cc",
"crypto/trust_token/trust_token_test.cc",
"crypto/x509/x509_test.cc",
- "crypto/x509/x509_time_test.cc"
+ "crypto/x509/x509_time_test.cc",
+ "crypto/xwing/xwing_test.cc"
],
"data": [
"crypto/blake2/blake2b256_tests.txt",
diff --git a/gen/sources.mk b/gen/sources.mk
index b6664dc..37ff3bc 100644
--- a/gen/sources.mk
+++ b/gen/sources.mk
@@ -498,6 +498,7 @@
crypto/x509/x_val.cc \
crypto/x509/x_x509.cc \
crypto/x509/x_x509a.cc \
+ crypto/xwing/xwing.cc \
gen/crypto/err_data.cc
boringssl_crypto_headers := \
@@ -588,7 +589,8 @@
include/openssl/x509.h \
include/openssl/x509_vfy.h \
include/openssl/x509v3.h \
- include/openssl/x509v3_errors.h
+ include/openssl/x509v3_errors.h \
+ include/openssl/xwing.h
boringssl_crypto_internal_headers := \
crypto/asn1/internal.h \
@@ -767,7 +769,8 @@
crypto/thread_test.cc \
crypto/trust_token/trust_token_test.cc \
crypto/x509/x509_test.cc \
- crypto/x509/x509_time_test.cc
+ crypto/x509/x509_time_test.cc \
+ crypto/xwing/xwing_test.cc
boringssl_crypto_test_data := \
crypto/blake2/blake2b256_tests.txt \
diff --git a/include/openssl/xwing.h b/include/openssl/xwing.h
new file mode 100644
index 0000000..1cf2dc7
--- /dev/null
+++ b/include/openssl/xwing.h
@@ -0,0 +1,90 @@
+// Copyright 2025 The BoringSSL Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef OPENSSL_HEADER_XWING_H
+#define OPENSSL_HEADER_XWING_H
+
+#include <openssl/base.h> // IWYU pragma: export
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+// X-Wing.
+//
+// This implements the X-Wing key encapsulation mechanism from
+// https://datatracker.ietf.org/doc/html/draft-connolly-cfrg-xwing-kem-06.
+
+
+// XWING_PUBLIC_KEY_BYTES is the number of bytes in an encoded X-Wing public
+// key.
+#define XWING_PUBLIC_KEY_BYTES 1216
+
+// XWING_PRIVATE_KEY_BYTES is the number of bytes in an encoded X-Wing private
+// key.
+#define XWING_PRIVATE_KEY_BYTES 32
+
+// XWING_CIPHERTEXT_BYTES is the number of bytes in the X-Wing ciphertext.
+#define XWING_CIPHERTEXT_BYTES 1120
+
+// XWING_SHARED_SECRET_BYTES is the number of bytes in an X-Wing shared secret.
+#define XWING_SHARED_SECRET_BYTES 32
+
+// XWING_generate_key generates a random public/private key pair, writes the
+// encoded public key to |out_encoded_public_key| and the encoded private key to
+// |out_encoded_private_key|. Returns one on success and zero on error.
+OPENSSL_EXPORT int XWING_generate_key(
+ uint8_t out_encoded_public_key[XWING_PUBLIC_KEY_BYTES],
+ uint8_t out_encoded_private_key[XWING_PRIVATE_KEY_BYTES]);
+
+// XWING_public_from_private sets |out_encoded_public_key| to the public key
+// that corresponds to |encoded_private_key|. Returns one on success and zero on
+// error.
+OPENSSL_EXPORT int XWING_public_from_private(
+ uint8_t out_encoded_public_key[XWING_PUBLIC_KEY_BYTES],
+ const uint8_t encoded_private_key[XWING_PRIVATE_KEY_BYTES]);
+
+// XWING_encap encapsulates a random shared secret for |encoded_public_key|,
+// writes the ciphertext to |out_ciphertext|, and writes the random shared
+// secret to |out_shared_secret|. Returns one on success and zero on error.
+OPENSSL_EXPORT int XWING_encap(
+ uint8_t out_ciphertext[XWING_CIPHERTEXT_BYTES],
+ uint8_t out_shared_secret[XWING_SHARED_SECRET_BYTES],
+ const uint8_t encoded_public_key[XWING_PUBLIC_KEY_BYTES]);
+
+// XWING_encap_external_entropy encapsulates the shared secret for the given
+// |eseed| entropy using |encoded_public_key|, writes the ciphertext to
+// |out_ciphertext|, and writes the random shared secret to |out_shared_secret|.
+// Returns one on success and zero on error.
+OPENSSL_EXPORT int XWING_encap_external_entropy(
+ uint8_t out_ciphertext[XWING_CIPHERTEXT_BYTES],
+ uint8_t out_shared_secret[XWING_SHARED_SECRET_BYTES],
+ const uint8_t encoded_public_key[XWING_PUBLIC_KEY_BYTES],
+ const uint8_t eseed[64]);
+
+// XWING_decap decapsulates a shared secret from |ciphertext| using
+// |encoded_private_key| and writes it to |out_shared_secret|. Returns one on
+// success and zero on error.
+OPENSSL_EXPORT int XWING_decap(
+ uint8_t out_shared_secret[XWING_SHARED_SECRET_BYTES],
+ const uint8_t ciphertext[XWING_CIPHERTEXT_BYTES],
+ const uint8_t encoded_private_key[XWING_PRIVATE_KEY_BYTES]);
+
+
+#if defined(__cplusplus)
+} // extern C
+#endif
+
+#endif // OPENSSL_HEADER_XWING_H
