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-rw-r--r--crypto/shared.c1418
1 files changed, 1418 insertions, 0 deletions
diff --git a/crypto/shared.c b/crypto/shared.c
new file mode 100644
index 0000000..78252b8
--- /dev/null
+++ b/crypto/shared.c
@@ -0,0 +1,1418 @@
+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2019 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "shared.h"
+
+#ifdef WIN32
+# include <winsock2.h>
+# include <ws2tcpip.h>
+#else
+# include <netinet/in.h>
+#endif
+
+#include <string.h>
+#include <assert.h>
+
+#include "ngtcp2_macro.h"
+#include "ngtcp2_net.h"
+
+ngtcp2_crypto_md *ngtcp2_crypto_md_init(ngtcp2_crypto_md *md,
+ void *md_native_handle) {
+ md->native_handle = md_native_handle;
+ return md;
+}
+
+int ngtcp2_crypto_hkdf_expand_label(uint8_t *dest, size_t destlen,
+ const ngtcp2_crypto_md *md,
+ const uint8_t *secret, size_t secretlen,
+ const uint8_t *label, size_t labellen) {
+ static const uint8_t LABEL[] = "tls13 ";
+ uint8_t info[256];
+ uint8_t *p = info;
+
+ *p++ = (uint8_t)(destlen / 256);
+ *p++ = (uint8_t)(destlen % 256);
+ *p++ = (uint8_t)(sizeof(LABEL) - 1 + labellen);
+ memcpy(p, LABEL, sizeof(LABEL) - 1);
+ p += sizeof(LABEL) - 1;
+ memcpy(p, label, labellen);
+ p += labellen;
+ *p++ = 0;
+
+ return ngtcp2_crypto_hkdf_expand(dest, destlen, md, secret, secretlen, info,
+ (size_t)(p - info));
+}
+
+#define NGTCP2_CRYPTO_INITIAL_SECRETLEN 32
+
+int ngtcp2_crypto_derive_initial_secrets(uint32_t version, uint8_t *rx_secret,
+ uint8_t *tx_secret,
+ uint8_t *initial_secret,
+ const ngtcp2_cid *client_dcid,
+ ngtcp2_crypto_side side) {
+ static const uint8_t CLABEL[] = "client in";
+ static const uint8_t SLABEL[] = "server in";
+ uint8_t initial_secret_buf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
+ uint8_t *client_secret;
+ uint8_t *server_secret;
+ ngtcp2_crypto_ctx ctx;
+ const uint8_t *salt;
+ size_t saltlen;
+
+ if (!initial_secret) {
+ initial_secret = initial_secret_buf;
+ }
+
+ ngtcp2_crypto_ctx_initial(&ctx);
+
+ switch (version) {
+ case NGTCP2_PROTO_VER_V1:
+ salt = (const uint8_t *)NGTCP2_INITIAL_SALT_V1;
+ saltlen = sizeof(NGTCP2_INITIAL_SALT_V1) - 1;
+ break;
+ case NGTCP2_PROTO_VER_V2_DRAFT:
+ salt = (const uint8_t *)NGTCP2_INITIAL_SALT_V2_DRAFT;
+ saltlen = sizeof(NGTCP2_INITIAL_SALT_V2_DRAFT) - 1;
+ break;
+ default:
+ salt = (const uint8_t *)NGTCP2_INITIAL_SALT_DRAFT;
+ saltlen = sizeof(NGTCP2_INITIAL_SALT_DRAFT) - 1;
+ }
+
+ if (ngtcp2_crypto_hkdf_extract(initial_secret, &ctx.md, client_dcid->data,
+ client_dcid->datalen, salt, saltlen) != 0) {
+ return -1;
+ }
+
+ if (side == NGTCP2_CRYPTO_SIDE_SERVER) {
+ client_secret = rx_secret;
+ server_secret = tx_secret;
+ } else {
+ client_secret = tx_secret;
+ server_secret = rx_secret;
+ }
+
+ if (ngtcp2_crypto_hkdf_expand_label(
+ client_secret, NGTCP2_CRYPTO_INITIAL_SECRETLEN, &ctx.md,
+ initial_secret, NGTCP2_CRYPTO_INITIAL_SECRETLEN, CLABEL,
+ sizeof(CLABEL) - 1) != 0 ||
+ ngtcp2_crypto_hkdf_expand_label(
+ server_secret, NGTCP2_CRYPTO_INITIAL_SECRETLEN, &ctx.md,
+ initial_secret, NGTCP2_CRYPTO_INITIAL_SECRETLEN, SLABEL,
+ sizeof(SLABEL) - 1) != 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+size_t ngtcp2_crypto_packet_protection_ivlen(const ngtcp2_crypto_aead *aead) {
+ size_t noncelen = ngtcp2_crypto_aead_noncelen(aead);
+ return ngtcp2_max(8, noncelen);
+}
+
+int ngtcp2_crypto_derive_packet_protection_key(
+ uint8_t *key, uint8_t *iv, uint8_t *hp_key, uint32_t version,
+ const ngtcp2_crypto_aead *aead, const ngtcp2_crypto_md *md,
+ const uint8_t *secret, size_t secretlen) {
+ static const uint8_t KEY_LABEL_V1[] = "quic key";
+ static const uint8_t IV_LABEL_V1[] = "quic iv";
+ static const uint8_t HP_KEY_LABEL_V1[] = "quic hp";
+ static const uint8_t KEY_LABEL_V2_DRAFT[] = "quicv2 key";
+ static const uint8_t IV_LABEL_V2_DRAFT[] = "quicv2 iv";
+ static const uint8_t HP_KEY_LABEL_V2_DRAFT[] = "quicv2 hp";
+ size_t keylen = ngtcp2_crypto_aead_keylen(aead);
+ size_t ivlen = ngtcp2_crypto_packet_protection_ivlen(aead);
+ const uint8_t *key_label;
+ size_t key_labellen;
+ const uint8_t *iv_label;
+ size_t iv_labellen;
+ const uint8_t *hp_key_label;
+ size_t hp_key_labellen;
+
+ switch (version) {
+ case NGTCP2_PROTO_VER_V2_DRAFT:
+ key_label = KEY_LABEL_V2_DRAFT;
+ key_labellen = sizeof(KEY_LABEL_V2_DRAFT) - 1;
+ iv_label = IV_LABEL_V2_DRAFT;
+ iv_labellen = sizeof(IV_LABEL_V2_DRAFT) - 1;
+ hp_key_label = HP_KEY_LABEL_V2_DRAFT;
+ hp_key_labellen = sizeof(HP_KEY_LABEL_V2_DRAFT) - 1;
+ break;
+ default:
+ key_label = KEY_LABEL_V1;
+ key_labellen = sizeof(KEY_LABEL_V1) - 1;
+ iv_label = IV_LABEL_V1;
+ iv_labellen = sizeof(IV_LABEL_V1) - 1;
+ hp_key_label = HP_KEY_LABEL_V1;
+ hp_key_labellen = sizeof(HP_KEY_LABEL_V1) - 1;
+ }
+
+ if (ngtcp2_crypto_hkdf_expand_label(key, keylen, md, secret, secretlen,
+ key_label, key_labellen) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_hkdf_expand_label(iv, ivlen, md, secret, secretlen,
+ iv_label, iv_labellen) != 0) {
+ return -1;
+ }
+
+ if (hp_key != NULL &&
+ ngtcp2_crypto_hkdf_expand_label(hp_key, keylen, md, secret, secretlen,
+ hp_key_label, hp_key_labellen) != 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+int ngtcp2_crypto_update_traffic_secret(uint8_t *dest,
+ const ngtcp2_crypto_md *md,
+ const uint8_t *secret,
+ size_t secretlen) {
+ static const uint8_t LABEL[] = "quic ku";
+
+ if (ngtcp2_crypto_hkdf_expand_label(dest, secretlen, md, secret, secretlen,
+ LABEL, sizeof(LABEL) - 1) != 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+int ngtcp2_crypto_derive_and_install_rx_key(ngtcp2_conn *conn, uint8_t *key,
+ uint8_t *iv, uint8_t *hp_key,
+ ngtcp2_crypto_level level,
+ const uint8_t *secret,
+ size_t secretlen) {
+ const ngtcp2_crypto_ctx *ctx;
+ const ngtcp2_crypto_aead *aead;
+ const ngtcp2_crypto_md *md;
+ const ngtcp2_crypto_cipher *hp;
+ ngtcp2_crypto_aead_ctx aead_ctx = {0};
+ ngtcp2_crypto_cipher_ctx hp_ctx = {0};
+ void *tls = ngtcp2_conn_get_tls_native_handle(conn);
+ uint8_t keybuf[64], ivbuf[64], hp_keybuf[64];
+ size_t ivlen;
+ int rv;
+ ngtcp2_crypto_ctx cctx;
+ uint32_t version;
+
+ if (level == NGTCP2_CRYPTO_LEVEL_EARLY && !ngtcp2_conn_is_server(conn)) {
+ return 0;
+ }
+
+ if (!key) {
+ key = keybuf;
+ }
+ if (!iv) {
+ iv = ivbuf;
+ }
+ if (!hp_key) {
+ hp_key = hp_keybuf;
+ }
+
+ switch (level) {
+ case NGTCP2_CRYPTO_LEVEL_EARLY:
+ ngtcp2_crypto_ctx_tls_early(&cctx, tls);
+ ngtcp2_conn_set_early_crypto_ctx(conn, &cctx);
+ ctx = ngtcp2_conn_get_early_crypto_ctx(conn);
+ version = ngtcp2_conn_get_client_chosen_version(conn);
+ break;
+ case NGTCP2_CRYPTO_LEVEL_HANDSHAKE:
+ if (ngtcp2_conn_is_server(conn) &&
+ !ngtcp2_conn_get_negotiated_version(conn)) {
+ rv = ngtcp2_crypto_set_remote_transport_params(conn, tls);
+ if (rv != 0) {
+ return -1;
+ }
+ }
+ /* fall through */
+ default:
+ ctx = ngtcp2_conn_get_crypto_ctx(conn);
+ version = ngtcp2_conn_get_negotiated_version(conn);
+
+ if (!ctx->aead.native_handle) {
+ ngtcp2_crypto_ctx_tls(&cctx, tls);
+ ngtcp2_conn_set_crypto_ctx(conn, &cctx);
+ ctx = ngtcp2_conn_get_crypto_ctx(conn);
+ }
+ }
+
+ aead = &ctx->aead;
+ md = &ctx->md;
+ hp = &ctx->hp;
+ ivlen = ngtcp2_crypto_packet_protection_ivlen(aead);
+
+ if (ngtcp2_crypto_derive_packet_protection_key(key, iv, hp_key, version, aead,
+ md, secret, secretlen) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_decrypt_init(&aead_ctx, aead, key, ivlen) != 0) {
+ goto fail;
+ }
+
+ if (ngtcp2_crypto_cipher_ctx_encrypt_init(&hp_ctx, hp, hp_key) != 0) {
+ goto fail;
+ }
+
+ switch (level) {
+ case NGTCP2_CRYPTO_LEVEL_EARLY:
+ rv = ngtcp2_conn_install_early_key(conn, &aead_ctx, iv, ivlen, &hp_ctx);
+ if (rv != 0) {
+ goto fail;
+ }
+ break;
+ case NGTCP2_CRYPTO_LEVEL_HANDSHAKE:
+ rv = ngtcp2_conn_install_rx_handshake_key(conn, &aead_ctx, iv, ivlen,
+ &hp_ctx);
+ if (rv != 0) {
+ goto fail;
+ }
+ break;
+ case NGTCP2_CRYPTO_LEVEL_APPLICATION:
+ if (!ngtcp2_conn_is_server(conn)) {
+ rv = ngtcp2_crypto_set_remote_transport_params(conn, tls);
+ if (rv != 0) {
+ goto fail;
+ }
+ }
+
+ rv = ngtcp2_conn_install_rx_key(conn, secret, secretlen, &aead_ctx, iv,
+ ivlen, &hp_ctx);
+ if (rv != 0) {
+ goto fail;
+ }
+
+ break;
+ default:
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ ngtcp2_crypto_cipher_ctx_free(&hp_ctx);
+ ngtcp2_crypto_aead_ctx_free(&aead_ctx);
+
+ return -1;
+}
+
+/*
+ * crypto_set_local_transport_params gets local QUIC transport
+ * parameters from |conn| and sets it to |tls|.
+ *
+ * This function returns 0 if it succeeds, or -1.
+ */
+static int crypto_set_local_transport_params(ngtcp2_conn *conn, void *tls) {
+ ngtcp2_ssize nwrite;
+ uint8_t buf[256];
+
+ nwrite = ngtcp2_conn_encode_local_transport_params(conn, buf, sizeof(buf));
+ if (nwrite < 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_set_local_transport_params(tls, buf, (size_t)nwrite) != 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+int ngtcp2_crypto_derive_and_install_tx_key(ngtcp2_conn *conn, uint8_t *key,
+ uint8_t *iv, uint8_t *hp_key,
+ ngtcp2_crypto_level level,
+ const uint8_t *secret,
+ size_t secretlen) {
+ const ngtcp2_crypto_ctx *ctx;
+ const ngtcp2_crypto_aead *aead;
+ const ngtcp2_crypto_md *md;
+ const ngtcp2_crypto_cipher *hp;
+ ngtcp2_crypto_aead_ctx aead_ctx = {0};
+ ngtcp2_crypto_cipher_ctx hp_ctx = {0};
+ void *tls = ngtcp2_conn_get_tls_native_handle(conn);
+ uint8_t keybuf[64], ivbuf[64], hp_keybuf[64];
+ size_t ivlen;
+ int rv;
+ ngtcp2_crypto_ctx cctx;
+ uint32_t version;
+
+ if (level == NGTCP2_CRYPTO_LEVEL_EARLY && ngtcp2_conn_is_server(conn)) {
+ return 0;
+ }
+
+ if (!key) {
+ key = keybuf;
+ }
+ if (!iv) {
+ iv = ivbuf;
+ }
+ if (!hp_key) {
+ hp_key = hp_keybuf;
+ }
+
+ switch (level) {
+ case NGTCP2_CRYPTO_LEVEL_EARLY:
+ ngtcp2_crypto_ctx_tls_early(&cctx, tls);
+ ngtcp2_conn_set_early_crypto_ctx(conn, &cctx);
+ ctx = ngtcp2_conn_get_early_crypto_ctx(conn);
+ version = ngtcp2_conn_get_client_chosen_version(conn);
+ break;
+ case NGTCP2_CRYPTO_LEVEL_HANDSHAKE:
+ if (ngtcp2_conn_is_server(conn) &&
+ !ngtcp2_conn_get_negotiated_version(conn)) {
+ rv = ngtcp2_crypto_set_remote_transport_params(conn, tls);
+ if (rv != 0) {
+ return -1;
+ }
+ }
+ /* fall through */
+ default:
+ ctx = ngtcp2_conn_get_crypto_ctx(conn);
+ version = ngtcp2_conn_get_negotiated_version(conn);
+
+ if (!ctx->aead.native_handle) {
+ ngtcp2_crypto_ctx_tls(&cctx, tls);
+ ngtcp2_conn_set_crypto_ctx(conn, &cctx);
+ ctx = ngtcp2_conn_get_crypto_ctx(conn);
+ }
+ }
+
+ aead = &ctx->aead;
+ md = &ctx->md;
+ hp = &ctx->hp;
+ ivlen = ngtcp2_crypto_packet_protection_ivlen(aead);
+
+ if (ngtcp2_crypto_derive_packet_protection_key(key, iv, hp_key, version, aead,
+ md, secret, secretlen) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_encrypt_init(&aead_ctx, aead, key, ivlen) != 0) {
+ goto fail;
+ }
+
+ if (ngtcp2_crypto_cipher_ctx_encrypt_init(&hp_ctx, hp, hp_key) != 0) {
+ goto fail;
+ }
+
+ switch (level) {
+ case NGTCP2_CRYPTO_LEVEL_EARLY:
+ rv = ngtcp2_conn_install_early_key(conn, &aead_ctx, iv, ivlen, &hp_ctx);
+ if (rv != 0) {
+ goto fail;
+ }
+ break;
+ case NGTCP2_CRYPTO_LEVEL_HANDSHAKE:
+ rv = ngtcp2_conn_install_tx_handshake_key(conn, &aead_ctx, iv, ivlen,
+ &hp_ctx);
+ if (rv != 0) {
+ goto fail;
+ }
+
+ if (ngtcp2_conn_is_server(conn) &&
+ crypto_set_local_transport_params(conn, tls) != 0) {
+ goto fail;
+ }
+
+ break;
+ case NGTCP2_CRYPTO_LEVEL_APPLICATION:
+ rv = ngtcp2_conn_install_tx_key(conn, secret, secretlen, &aead_ctx, iv,
+ ivlen, &hp_ctx);
+ if (rv != 0) {
+ goto fail;
+ }
+
+ break;
+ default:
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ ngtcp2_crypto_cipher_ctx_free(&hp_ctx);
+ ngtcp2_crypto_aead_ctx_free(&aead_ctx);
+
+ return -1;
+}
+
+int ngtcp2_crypto_derive_and_install_initial_key(
+ ngtcp2_conn *conn, uint8_t *rx_secret, uint8_t *tx_secret,
+ uint8_t *initial_secret, uint8_t *rx_key, uint8_t *rx_iv,
+ uint8_t *rx_hp_key, uint8_t *tx_key, uint8_t *tx_iv, uint8_t *tx_hp_key,
+ uint32_t version, const ngtcp2_cid *client_dcid) {
+ uint8_t rx_secretbuf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
+ uint8_t tx_secretbuf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
+ uint8_t initial_secretbuf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
+ uint8_t rx_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
+ uint8_t rx_ivbuf[NGTCP2_CRYPTO_INITIAL_IVLEN];
+ uint8_t rx_hp_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
+ uint8_t tx_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
+ uint8_t tx_ivbuf[NGTCP2_CRYPTO_INITIAL_IVLEN];
+ uint8_t tx_hp_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
+ ngtcp2_crypto_ctx ctx;
+ ngtcp2_crypto_aead retry_aead;
+ ngtcp2_crypto_aead_ctx rx_aead_ctx = {0};
+ ngtcp2_crypto_cipher_ctx rx_hp_ctx = {0};
+ ngtcp2_crypto_aead_ctx tx_aead_ctx = {0};
+ ngtcp2_crypto_cipher_ctx tx_hp_ctx = {0};
+ ngtcp2_crypto_aead_ctx retry_aead_ctx = {0};
+ int rv;
+ int server = ngtcp2_conn_is_server(conn);
+ const uint8_t *retry_key;
+ size_t retry_noncelen;
+
+ ngtcp2_crypto_ctx_initial(&ctx);
+
+ if (!rx_secret) {
+ rx_secret = rx_secretbuf;
+ }
+ if (!tx_secret) {
+ tx_secret = tx_secretbuf;
+ }
+ if (!initial_secret) {
+ initial_secret = initial_secretbuf;
+ }
+
+ if (!rx_key) {
+ rx_key = rx_keybuf;
+ }
+ if (!rx_iv) {
+ rx_iv = rx_ivbuf;
+ }
+ if (!rx_hp_key) {
+ rx_hp_key = rx_hp_keybuf;
+ }
+ if (!tx_key) {
+ tx_key = tx_keybuf;
+ }
+ if (!tx_iv) {
+ tx_iv = tx_ivbuf;
+ }
+ if (!tx_hp_key) {
+ tx_hp_key = tx_hp_keybuf;
+ }
+
+ ngtcp2_conn_set_initial_crypto_ctx(conn, &ctx);
+
+ if (ngtcp2_crypto_derive_initial_secrets(
+ version, rx_secret, tx_secret, initial_secret, client_dcid,
+ server ? NGTCP2_CRYPTO_SIDE_SERVER : NGTCP2_CRYPTO_SIDE_CLIENT) !=
+ 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_derive_packet_protection_key(
+ rx_key, rx_iv, rx_hp_key, version, &ctx.aead, &ctx.md, rx_secret,
+ NGTCP2_CRYPTO_INITIAL_SECRETLEN) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_derive_packet_protection_key(
+ tx_key, tx_iv, tx_hp_key, version, &ctx.aead, &ctx.md, tx_secret,
+ NGTCP2_CRYPTO_INITIAL_SECRETLEN) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_decrypt_init(&rx_aead_ctx, &ctx.aead, rx_key,
+ NGTCP2_CRYPTO_INITIAL_IVLEN) != 0) {
+ goto fail;
+ }
+
+ if (ngtcp2_crypto_cipher_ctx_encrypt_init(&rx_hp_ctx, &ctx.hp, rx_hp_key) !=
+ 0) {
+ goto fail;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_encrypt_init(&tx_aead_ctx, &ctx.aead, tx_key,
+ NGTCP2_CRYPTO_INITIAL_IVLEN) != 0) {
+ goto fail;
+ }
+
+ if (ngtcp2_crypto_cipher_ctx_encrypt_init(&tx_hp_ctx, &ctx.hp, tx_hp_key) !=
+ 0) {
+ goto fail;
+ }
+
+ if (!server && !ngtcp2_conn_after_retry(conn)) {
+ ngtcp2_crypto_aead_retry(&retry_aead);
+
+ switch (version) {
+ case NGTCP2_PROTO_VER_V1:
+ retry_key = (const uint8_t *)NGTCP2_RETRY_KEY_V1;
+ retry_noncelen = sizeof(NGTCP2_RETRY_NONCE_V1) - 1;
+ break;
+ case NGTCP2_PROTO_VER_V2_DRAFT:
+ retry_key = (const uint8_t *)NGTCP2_RETRY_KEY_V2_DRAFT;
+ retry_noncelen = sizeof(NGTCP2_RETRY_NONCE_V2_DRAFT) - 1;
+ break;
+ default:
+ retry_key = (const uint8_t *)NGTCP2_RETRY_KEY_DRAFT;
+ retry_noncelen = sizeof(NGTCP2_RETRY_NONCE_DRAFT) - 1;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_encrypt_init(&retry_aead_ctx, &retry_aead,
+ retry_key, retry_noncelen) != 0) {
+ goto fail;
+ }
+ }
+
+ rv = ngtcp2_conn_install_initial_key(conn, &rx_aead_ctx, rx_iv, &rx_hp_ctx,
+ &tx_aead_ctx, tx_iv, &tx_hp_ctx,
+ NGTCP2_CRYPTO_INITIAL_IVLEN);
+ if (rv != 0) {
+ goto fail;
+ }
+
+ if (retry_aead_ctx.native_handle) {
+ ngtcp2_conn_set_retry_aead(conn, &retry_aead, &retry_aead_ctx);
+ }
+
+ return 0;
+
+fail:
+ ngtcp2_crypto_aead_ctx_free(&retry_aead_ctx);
+ ngtcp2_crypto_cipher_ctx_free(&tx_hp_ctx);
+ ngtcp2_crypto_aead_ctx_free(&tx_aead_ctx);
+ ngtcp2_crypto_cipher_ctx_free(&rx_hp_ctx);
+ ngtcp2_crypto_aead_ctx_free(&rx_aead_ctx);
+
+ return -1;
+}
+
+int ngtcp2_crypto_derive_and_install_vneg_initial_key(
+ ngtcp2_conn *conn, uint8_t *rx_secret, uint8_t *tx_secret,
+ uint8_t *initial_secret, uint8_t *rx_key, uint8_t *rx_iv,
+ uint8_t *rx_hp_key, uint8_t *tx_key, uint8_t *tx_iv, uint8_t *tx_hp_key,
+ uint32_t version, const ngtcp2_cid *client_dcid) {
+ uint8_t rx_secretbuf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
+ uint8_t tx_secretbuf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
+ uint8_t initial_secretbuf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
+ uint8_t rx_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
+ uint8_t rx_ivbuf[NGTCP2_CRYPTO_INITIAL_IVLEN];
+ uint8_t rx_hp_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
+ uint8_t tx_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
+ uint8_t tx_ivbuf[NGTCP2_CRYPTO_INITIAL_IVLEN];
+ uint8_t tx_hp_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
+ const ngtcp2_crypto_ctx *ctx = ngtcp2_conn_get_initial_crypto_ctx(conn);
+ ngtcp2_crypto_aead_ctx rx_aead_ctx = {0};
+ ngtcp2_crypto_cipher_ctx rx_hp_ctx = {0};
+ ngtcp2_crypto_aead_ctx tx_aead_ctx = {0};
+ ngtcp2_crypto_cipher_ctx tx_hp_ctx = {0};
+ int rv;
+ int server = ngtcp2_conn_is_server(conn);
+
+ if (!rx_secret) {
+ rx_secret = rx_secretbuf;
+ }
+ if (!tx_secret) {
+ tx_secret = tx_secretbuf;
+ }
+ if (!initial_secret) {
+ initial_secret = initial_secretbuf;
+ }
+
+ if (!rx_key) {
+ rx_key = rx_keybuf;
+ }
+ if (!rx_iv) {
+ rx_iv = rx_ivbuf;
+ }
+ if (!rx_hp_key) {
+ rx_hp_key = rx_hp_keybuf;
+ }
+ if (!tx_key) {
+ tx_key = tx_keybuf;
+ }
+ if (!tx_iv) {
+ tx_iv = tx_ivbuf;
+ }
+ if (!tx_hp_key) {
+ tx_hp_key = tx_hp_keybuf;
+ }
+
+ if (ngtcp2_crypto_derive_initial_secrets(
+ version, rx_secret, tx_secret, initial_secret, client_dcid,
+ server ? NGTCP2_CRYPTO_SIDE_SERVER : NGTCP2_CRYPTO_SIDE_CLIENT) !=
+ 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_derive_packet_protection_key(
+ rx_key, rx_iv, rx_hp_key, version, &ctx->aead, &ctx->md, rx_secret,
+ NGTCP2_CRYPTO_INITIAL_SECRETLEN) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_derive_packet_protection_key(
+ tx_key, tx_iv, tx_hp_key, version, &ctx->aead, &ctx->md, tx_secret,
+ NGTCP2_CRYPTO_INITIAL_SECRETLEN) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_decrypt_init(&rx_aead_ctx, &ctx->aead, rx_key,
+ NGTCP2_CRYPTO_INITIAL_IVLEN) != 0) {
+ goto fail;
+ }
+
+ if (ngtcp2_crypto_cipher_ctx_encrypt_init(&rx_hp_ctx, &ctx->hp, rx_hp_key) !=
+ 0) {
+ goto fail;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_encrypt_init(&tx_aead_ctx, &ctx->aead, tx_key,
+ NGTCP2_CRYPTO_INITIAL_IVLEN) != 0) {
+ goto fail;
+ }
+
+ if (ngtcp2_crypto_cipher_ctx_encrypt_init(&tx_hp_ctx, &ctx->hp, tx_hp_key) !=
+ 0) {
+ goto fail;
+ }
+
+ rv = ngtcp2_conn_install_vneg_initial_key(
+ conn, version, &rx_aead_ctx, rx_iv, &rx_hp_ctx, &tx_aead_ctx, tx_iv,
+ &tx_hp_ctx, NGTCP2_CRYPTO_INITIAL_IVLEN);
+ if (rv != 0) {
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ ngtcp2_crypto_cipher_ctx_free(&tx_hp_ctx);
+ ngtcp2_crypto_aead_ctx_free(&tx_aead_ctx);
+ ngtcp2_crypto_cipher_ctx_free(&rx_hp_ctx);
+ ngtcp2_crypto_aead_ctx_free(&rx_aead_ctx);
+
+ return -1;
+}
+
+int ngtcp2_crypto_update_key(
+ ngtcp2_conn *conn, uint8_t *rx_secret, uint8_t *tx_secret,
+ ngtcp2_crypto_aead_ctx *rx_aead_ctx, uint8_t *rx_key, uint8_t *rx_iv,
+ ngtcp2_crypto_aead_ctx *tx_aead_ctx, uint8_t *tx_key, uint8_t *tx_iv,
+ const uint8_t *current_rx_secret, const uint8_t *current_tx_secret,
+ size_t secretlen) {
+ const ngtcp2_crypto_ctx *ctx = ngtcp2_conn_get_crypto_ctx(conn);
+ const ngtcp2_crypto_aead *aead = &ctx->aead;
+ const ngtcp2_crypto_md *md = &ctx->md;
+ size_t ivlen = ngtcp2_crypto_packet_protection_ivlen(aead);
+ uint32_t version = ngtcp2_conn_get_negotiated_version(conn);
+
+ if (ngtcp2_crypto_update_traffic_secret(rx_secret, md, current_rx_secret,
+ secretlen) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_derive_packet_protection_key(
+ rx_key, rx_iv, NULL, version, aead, md, rx_secret, secretlen) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_update_traffic_secret(tx_secret, md, current_tx_secret,
+ secretlen) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_derive_packet_protection_key(
+ tx_key, tx_iv, NULL, version, aead, md, tx_secret, secretlen) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_decrypt_init(rx_aead_ctx, aead, rx_key, ivlen) !=
+ 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_encrypt_init(tx_aead_ctx, aead, tx_key, ivlen) !=
+ 0) {
+ ngtcp2_crypto_aead_ctx_free(rx_aead_ctx);
+ rx_aead_ctx->native_handle = NULL;
+ return -1;
+ }
+
+ return 0;
+}
+
+int ngtcp2_crypto_encrypt_cb(uint8_t *dest, const ngtcp2_crypto_aead *aead,
+ const ngtcp2_crypto_aead_ctx *aead_ctx,
+ const uint8_t *plaintext, size_t plaintextlen,
+ const uint8_t *nonce, size_t noncelen,
+ const uint8_t *aad, size_t aadlen) {
+ if (ngtcp2_crypto_encrypt(dest, aead, aead_ctx, plaintext, plaintextlen,
+ nonce, noncelen, aad, aadlen) != 0) {
+ return NGTCP2_ERR_CALLBACK_FAILURE;
+ }
+ return 0;
+}
+
+int ngtcp2_crypto_decrypt_cb(uint8_t *dest, const ngtcp2_crypto_aead *aead,
+ const ngtcp2_crypto_aead_ctx *aead_ctx,
+ const uint8_t *ciphertext, size_t ciphertextlen,
+ const uint8_t *nonce, size_t noncelen,
+ const uint8_t *aad, size_t aadlen) {
+ if (ngtcp2_crypto_decrypt(dest, aead, aead_ctx, ciphertext, ciphertextlen,
+ nonce, noncelen, aad, aadlen) != 0) {
+ return NGTCP2_ERR_DECRYPT;
+ }
+ return 0;
+}
+
+int ngtcp2_crypto_hp_mask_cb(uint8_t *dest, const ngtcp2_crypto_cipher *hp,
+ const ngtcp2_crypto_cipher_ctx *hp_ctx,
+ const uint8_t *sample) {
+ if (ngtcp2_crypto_hp_mask(dest, hp, hp_ctx, sample) != 0) {
+ return NGTCP2_ERR_CALLBACK_FAILURE;
+ }
+ return 0;
+}
+
+int ngtcp2_crypto_update_key_cb(
+ ngtcp2_conn *conn, uint8_t *rx_secret, uint8_t *tx_secret,
+ ngtcp2_crypto_aead_ctx *rx_aead_ctx, uint8_t *rx_iv,
+ ngtcp2_crypto_aead_ctx *tx_aead_ctx, uint8_t *tx_iv,
+ const uint8_t *current_rx_secret, const uint8_t *current_tx_secret,
+ size_t secretlen, void *user_data) {
+ uint8_t rx_key[64];
+ uint8_t tx_key[64];
+ (void)conn;
+ (void)user_data;
+
+ if (ngtcp2_crypto_update_key(conn, rx_secret, tx_secret, rx_aead_ctx, rx_key,
+ rx_iv, tx_aead_ctx, tx_key, tx_iv,
+ current_rx_secret, current_tx_secret,
+ secretlen) != 0) {
+ return NGTCP2_ERR_CALLBACK_FAILURE;
+ }
+ return 0;
+}
+
+int ngtcp2_crypto_generate_stateless_reset_token(uint8_t *token,
+ const uint8_t *secret,
+ size_t secretlen,
+ const ngtcp2_cid *cid) {
+ static const uint8_t info[] = "stateless_reset";
+ ngtcp2_crypto_md md;
+
+ if (ngtcp2_crypto_hkdf(token, NGTCP2_STATELESS_RESET_TOKENLEN,
+ ngtcp2_crypto_md_sha256(&md), secret, secretlen,
+ cid->data, cid->datalen, info,
+ sizeof(info) - 1) != 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+static int crypto_derive_token_key(uint8_t *key, size_t keylen, uint8_t *iv,
+ size_t ivlen, const ngtcp2_crypto_md *md,
+ const uint8_t *secret, size_t secretlen,
+ const uint8_t *salt, size_t saltlen,
+ const uint8_t *info_prefix,
+ size_t info_prefixlen) {
+ static const uint8_t key_info_suffix[] = " key";
+ static const uint8_t iv_info_suffix[] = " iv";
+ uint8_t intsecret[32];
+ uint8_t info[32];
+ uint8_t *p;
+
+ assert(ngtcp2_crypto_md_hashlen(md) == sizeof(intsecret));
+ assert(info_prefixlen + sizeof(key_info_suffix) - 1 <= sizeof(info));
+ assert(info_prefixlen + sizeof(iv_info_suffix) - 1 <= sizeof(info));
+
+ if (ngtcp2_crypto_hkdf_extract(intsecret, md, secret, secretlen, salt,
+ saltlen) != 0) {
+ return -1;
+ }
+
+ memcpy(info, info_prefix, info_prefixlen);
+ p = info + info_prefixlen;
+
+ memcpy(p, key_info_suffix, sizeof(key_info_suffix) - 1);
+ p += sizeof(key_info_suffix) - 1;
+
+ if (ngtcp2_crypto_hkdf_expand(key, keylen, md, intsecret, sizeof(intsecret),
+ info, (size_t)(p - info)) != 0) {
+ return -1;
+ }
+
+ p = info + info_prefixlen;
+
+ memcpy(p, iv_info_suffix, sizeof(iv_info_suffix) - 1);
+ p += sizeof(iv_info_suffix) - 1;
+
+ if (ngtcp2_crypto_hkdf_expand(iv, ivlen, md, intsecret, sizeof(intsecret),
+ info, (size_t)(p - info)) != 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+static size_t crypto_generate_retry_token_aad(uint8_t *dest, uint32_t version,
+ const ngtcp2_sockaddr *sa,
+ ngtcp2_socklen salen,
+ const ngtcp2_cid *retry_scid) {
+ uint8_t *p = dest;
+
+ version = ngtcp2_htonl(version);
+ memcpy(p, &version, sizeof(version));
+ memcpy(p, sa, (size_t)salen);
+ p += salen;
+ memcpy(p, retry_scid->data, retry_scid->datalen);
+ p += retry_scid->datalen;
+
+ return (size_t)(p - dest);
+}
+
+static const uint8_t retry_token_info_prefix[] = "retry_token";
+
+ngtcp2_ssize ngtcp2_crypto_generate_retry_token(
+ uint8_t *token, const uint8_t *secret, size_t secretlen, uint32_t version,
+ const ngtcp2_sockaddr *remote_addr, ngtcp2_socklen remote_addrlen,
+ const ngtcp2_cid *retry_scid, const ngtcp2_cid *odcid, ngtcp2_tstamp ts) {
+ uint8_t plaintext[NGTCP2_CRYPTO_MAX_RETRY_TOKENLEN];
+ uint8_t rand_data[NGTCP2_CRYPTO_TOKEN_RAND_DATALEN];
+ uint8_t key[32];
+ uint8_t iv[32];
+ size_t keylen;
+ size_t ivlen;
+ ngtcp2_crypto_aead aead;
+ ngtcp2_crypto_md md;
+ ngtcp2_crypto_aead_ctx aead_ctx;
+ size_t plaintextlen;
+ uint8_t aad[sizeof(version) + sizeof(ngtcp2_sockaddr_storage) +
+ NGTCP2_MAX_CIDLEN];
+ size_t aadlen;
+ uint8_t *p = plaintext;
+ ngtcp2_tstamp ts_be = ngtcp2_htonl64(ts);
+ int rv;
+
+ memset(plaintext, 0, sizeof(plaintext));
+
+ *p++ = (uint8_t)odcid->datalen;
+ memcpy(p, odcid->data, odcid->datalen);
+ p += NGTCP2_MAX_CIDLEN;
+ memcpy(p, &ts_be, sizeof(ts_be));
+ p += sizeof(ts_be);
+
+ plaintextlen = (size_t)(p - plaintext);
+
+ if (ngtcp2_crypto_random(rand_data, sizeof(rand_data)) != 0) {
+ return -1;
+ }
+
+ ngtcp2_crypto_aead_aes_128_gcm(&aead);
+ ngtcp2_crypto_md_sha256(&md);
+
+ keylen = ngtcp2_crypto_aead_keylen(&aead);
+ ivlen = ngtcp2_crypto_aead_noncelen(&aead);
+
+ assert(sizeof(key) >= keylen);
+ assert(sizeof(iv) >= ivlen);
+
+ if (crypto_derive_token_key(key, keylen, iv, ivlen, &md, secret, secretlen,
+ rand_data, sizeof(rand_data),
+ retry_token_info_prefix,
+ sizeof(retry_token_info_prefix) - 1) != 0) {
+ return -1;
+ }
+
+ aadlen = crypto_generate_retry_token_aad(aad, version, remote_addr,
+ remote_addrlen, retry_scid);
+
+ p = token;
+ *p++ = NGTCP2_CRYPTO_TOKEN_MAGIC_RETRY;
+
+ if (ngtcp2_crypto_aead_ctx_encrypt_init(&aead_ctx, &aead, key, ivlen) != 0) {
+ return -1;
+ }
+
+ rv = ngtcp2_crypto_encrypt(p, &aead, &aead_ctx, plaintext, plaintextlen, iv,
+ ivlen, aad, aadlen);
+
+ ngtcp2_crypto_aead_ctx_free(&aead_ctx);
+
+ if (rv != 0) {
+ return -1;
+ }
+
+ p += plaintextlen + aead.max_overhead;
+ memcpy(p, rand_data, sizeof(rand_data));
+ p += sizeof(rand_data);
+
+ return p - token;
+}
+
+int ngtcp2_crypto_verify_retry_token(
+ ngtcp2_cid *odcid, const uint8_t *token, size_t tokenlen,
+ const uint8_t *secret, size_t secretlen, uint32_t version,
+ const ngtcp2_sockaddr *remote_addr, ngtcp2_socklen remote_addrlen,
+ const ngtcp2_cid *dcid, ngtcp2_duration timeout, ngtcp2_tstamp ts) {
+ uint8_t
+ plaintext[/* cid len = */ 1 + NGTCP2_MAX_CIDLEN + sizeof(ngtcp2_tstamp)];
+ uint8_t key[32];
+ uint8_t iv[32];
+ size_t keylen;
+ size_t ivlen;
+ ngtcp2_crypto_aead_ctx aead_ctx;
+ ngtcp2_crypto_aead aead;
+ ngtcp2_crypto_md md;
+ uint8_t aad[sizeof(version) + sizeof(ngtcp2_sockaddr_storage) +
+ NGTCP2_MAX_CIDLEN];
+ size_t aadlen;
+ const uint8_t *rand_data;
+ const uint8_t *ciphertext;
+ size_t ciphertextlen;
+ size_t cil;
+ int rv;
+ ngtcp2_tstamp gen_ts;
+
+ if (tokenlen != NGTCP2_CRYPTO_MAX_RETRY_TOKENLEN ||
+ token[0] != NGTCP2_CRYPTO_TOKEN_MAGIC_RETRY) {
+ return -1;
+ }
+
+ rand_data = token + tokenlen - NGTCP2_CRYPTO_TOKEN_RAND_DATALEN;
+ ciphertext = token + 1;
+ ciphertextlen = tokenlen - 1 - NGTCP2_CRYPTO_TOKEN_RAND_DATALEN;
+
+ ngtcp2_crypto_aead_aes_128_gcm(&aead);
+ ngtcp2_crypto_md_sha256(&md);
+
+ keylen = ngtcp2_crypto_aead_keylen(&aead);
+ ivlen = ngtcp2_crypto_aead_noncelen(&aead);
+
+ if (crypto_derive_token_key(key, keylen, iv, ivlen, &md, secret, secretlen,
+ rand_data, NGTCP2_CRYPTO_TOKEN_RAND_DATALEN,
+ retry_token_info_prefix,
+ sizeof(retry_token_info_prefix) - 1) != 0) {
+ return -1;
+ }
+
+ aadlen = crypto_generate_retry_token_aad(aad, version, remote_addr,
+ remote_addrlen, dcid);
+
+ if (ngtcp2_crypto_aead_ctx_decrypt_init(&aead_ctx, &aead, key, ivlen) != 0) {
+ return -1;
+ }
+
+ rv = ngtcp2_crypto_decrypt(plaintext, &aead, &aead_ctx, ciphertext,
+ ciphertextlen, iv, ivlen, aad, aadlen);
+
+ ngtcp2_crypto_aead_ctx_free(&aead_ctx);
+
+ if (rv != 0) {
+ return -1;
+ }
+
+ cil = plaintext[0];
+
+ assert(cil == 0 || (cil >= NGTCP2_MIN_CIDLEN && cil <= NGTCP2_MAX_CIDLEN));
+
+ memcpy(&gen_ts, plaintext + /* cid len = */ 1 + NGTCP2_MAX_CIDLEN,
+ sizeof(gen_ts));
+
+ gen_ts = ngtcp2_ntohl64(gen_ts);
+ if (gen_ts + timeout <= ts) {
+ return -1;
+ }
+
+ ngtcp2_cid_init(odcid, plaintext + /* cid len = */ 1, cil);
+
+ return 0;
+}
+
+static size_t crypto_generate_regular_token_aad(uint8_t *dest,
+ const ngtcp2_sockaddr *sa) {
+ const uint8_t *addr;
+ size_t addrlen;
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ addr = (const uint8_t *)&((const ngtcp2_sockaddr_in *)(void *)sa)->sin_addr;
+ addrlen = sizeof(((const ngtcp2_sockaddr_in *)(void *)sa)->sin_addr);
+ break;
+ case AF_INET6:
+ addr =
+ (const uint8_t *)&((const ngtcp2_sockaddr_in6 *)(void *)sa)->sin6_addr;
+ addrlen = sizeof(((const ngtcp2_sockaddr_in6 *)(void *)sa)->sin6_addr);
+ break;
+ default:
+ assert(0);
+ abort();
+ }
+
+ memcpy(dest, addr, addrlen);
+
+ return addrlen;
+}
+
+static const uint8_t regular_token_info_prefix[] = "regular_token";
+
+ngtcp2_ssize ngtcp2_crypto_generate_regular_token(
+ uint8_t *token, const uint8_t *secret, size_t secretlen,
+ const ngtcp2_sockaddr *remote_addr, ngtcp2_socklen remote_addrlen,
+ ngtcp2_tstamp ts) {
+ uint8_t plaintext[sizeof(ngtcp2_tstamp)];
+ uint8_t rand_data[NGTCP2_CRYPTO_TOKEN_RAND_DATALEN];
+ uint8_t key[32];
+ uint8_t iv[32];
+ size_t keylen;
+ size_t ivlen;
+ ngtcp2_crypto_aead aead;
+ ngtcp2_crypto_md md;
+ ngtcp2_crypto_aead_ctx aead_ctx;
+ size_t plaintextlen;
+ uint8_t aad[sizeof(ngtcp2_sockaddr_in6)];
+ size_t aadlen;
+ uint8_t *p = plaintext;
+ ngtcp2_tstamp ts_be = ngtcp2_htonl64(ts);
+ int rv;
+ (void)remote_addrlen;
+
+ memcpy(p, &ts_be, sizeof(ts_be));
+ p += sizeof(ts_be);
+
+ plaintextlen = (size_t)(p - plaintext);
+
+ if (ngtcp2_crypto_random(rand_data, sizeof(rand_data)) != 0) {
+ return -1;
+ }
+
+ ngtcp2_crypto_aead_aes_128_gcm(&aead);
+ ngtcp2_crypto_md_sha256(&md);
+
+ keylen = ngtcp2_crypto_aead_keylen(&aead);
+ ivlen = ngtcp2_crypto_aead_noncelen(&aead);
+
+ assert(sizeof(key) >= keylen);
+ assert(sizeof(iv) >= ivlen);
+
+ if (crypto_derive_token_key(key, keylen, iv, ivlen, &md, secret, secretlen,
+ rand_data, sizeof(rand_data),
+ regular_token_info_prefix,
+ sizeof(regular_token_info_prefix) - 1) != 0) {
+ return -1;
+ }
+
+ aadlen = crypto_generate_regular_token_aad(aad, remote_addr);
+
+ p = token;
+ *p++ = NGTCP2_CRYPTO_TOKEN_MAGIC_REGULAR;
+
+ if (ngtcp2_crypto_aead_ctx_encrypt_init(&aead_ctx, &aead, key, ivlen) != 0) {
+ return -1;
+ }
+
+ rv = ngtcp2_crypto_encrypt(p, &aead, &aead_ctx, plaintext, plaintextlen, iv,
+ ivlen, aad, aadlen);
+
+ ngtcp2_crypto_aead_ctx_free(&aead_ctx);
+
+ if (rv != 0) {
+ return -1;
+ }
+
+ p += plaintextlen + aead.max_overhead;
+ memcpy(p, rand_data, sizeof(rand_data));
+ p += sizeof(rand_data);
+
+ return p - token;
+}
+
+int ngtcp2_crypto_verify_regular_token(const uint8_t *token, size_t tokenlen,
+ const uint8_t *secret, size_t secretlen,
+ const ngtcp2_sockaddr *remote_addr,
+ ngtcp2_socklen remote_addrlen,
+ ngtcp2_duration timeout,
+ ngtcp2_tstamp ts) {
+ uint8_t plaintext[sizeof(ngtcp2_tstamp)];
+ uint8_t key[32];
+ uint8_t iv[32];
+ size_t keylen;
+ size_t ivlen;
+ ngtcp2_crypto_aead_ctx aead_ctx;
+ ngtcp2_crypto_aead aead;
+ ngtcp2_crypto_md md;
+ uint8_t aad[sizeof(ngtcp2_sockaddr_in6)];
+ size_t aadlen;
+ const uint8_t *rand_data;
+ const uint8_t *ciphertext;
+ size_t ciphertextlen;
+ int rv;
+ ngtcp2_tstamp gen_ts;
+ (void)remote_addrlen;
+
+ if (tokenlen != NGTCP2_CRYPTO_MAX_REGULAR_TOKENLEN ||
+ token[0] != NGTCP2_CRYPTO_TOKEN_MAGIC_REGULAR) {
+ return -1;
+ }
+
+ rand_data = token + tokenlen - NGTCP2_CRYPTO_TOKEN_RAND_DATALEN;
+ ciphertext = token + 1;
+ ciphertextlen = tokenlen - 1 - NGTCP2_CRYPTO_TOKEN_RAND_DATALEN;
+
+ ngtcp2_crypto_aead_aes_128_gcm(&aead);
+ ngtcp2_crypto_md_sha256(&md);
+
+ keylen = ngtcp2_crypto_aead_keylen(&aead);
+ ivlen = ngtcp2_crypto_aead_noncelen(&aead);
+
+ if (crypto_derive_token_key(key, keylen, iv, ivlen, &md, secret, secretlen,
+ rand_data, NGTCP2_CRYPTO_TOKEN_RAND_DATALEN,
+ regular_token_info_prefix,
+ sizeof(regular_token_info_prefix) - 1) != 0) {
+ return -1;
+ }
+
+ aadlen = crypto_generate_regular_token_aad(aad, remote_addr);
+
+ if (ngtcp2_crypto_aead_ctx_decrypt_init(&aead_ctx, &aead, key, ivlen) != 0) {
+ return -1;
+ }
+
+ rv = ngtcp2_crypto_decrypt(plaintext, &aead, &aead_ctx, ciphertext,
+ ciphertextlen, iv, ivlen, aad, aadlen);
+
+ ngtcp2_crypto_aead_ctx_free(&aead_ctx);
+
+ if (rv != 0) {
+ return -1;
+ }
+
+ memcpy(&gen_ts, plaintext, sizeof(gen_ts));
+
+ gen_ts = ngtcp2_ntohl64(gen_ts);
+ if (gen_ts + timeout <= ts) {
+ return -1;
+ }
+
+ return 0;
+}
+
+ngtcp2_ssize ngtcp2_crypto_write_connection_close(
+ uint8_t *dest, size_t destlen, uint32_t version, const ngtcp2_cid *dcid,
+ const ngtcp2_cid *scid, uint64_t error_code, const uint8_t *reason,
+ size_t reasonlen) {
+ uint8_t rx_secret[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
+ uint8_t tx_secret[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
+ uint8_t initial_secret[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
+ uint8_t tx_key[NGTCP2_CRYPTO_INITIAL_KEYLEN];
+ uint8_t tx_iv[NGTCP2_CRYPTO_INITIAL_IVLEN];
+ uint8_t tx_hp_key[NGTCP2_CRYPTO_INITIAL_KEYLEN];
+ ngtcp2_crypto_ctx ctx;
+ ngtcp2_ssize spktlen;
+ ngtcp2_crypto_aead_ctx aead_ctx = {0};
+ ngtcp2_crypto_cipher_ctx hp_ctx = {0};
+
+ ngtcp2_crypto_ctx_initial(&ctx);
+
+ if (ngtcp2_crypto_derive_initial_secrets(version, rx_secret, tx_secret,
+ initial_secret, scid,
+ NGTCP2_CRYPTO_SIDE_SERVER) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_derive_packet_protection_key(
+ tx_key, tx_iv, tx_hp_key, version, &ctx.aead, &ctx.md, tx_secret,
+ NGTCP2_CRYPTO_INITIAL_SECRETLEN) != 0) {
+ return -1;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_encrypt_init(&aead_ctx, &ctx.aead, tx_key,
+ NGTCP2_CRYPTO_INITIAL_IVLEN) != 0) {
+ spktlen = -1;
+ goto end;
+ }
+
+ if (ngtcp2_crypto_cipher_ctx_encrypt_init(&hp_ctx, &ctx.hp, tx_hp_key) != 0) {
+ spktlen = -1;
+ goto end;
+ }
+
+ spktlen = ngtcp2_pkt_write_connection_close(
+ dest, destlen, version, dcid, scid, error_code, reason, reasonlen,
+ ngtcp2_crypto_encrypt_cb, &ctx.aead, &aead_ctx, tx_iv,
+ ngtcp2_crypto_hp_mask_cb, &ctx.hp, &hp_ctx);
+ if (spktlen < 0) {
+ spktlen = -1;
+ }
+
+end:
+ ngtcp2_crypto_cipher_ctx_free(&hp_ctx);
+ ngtcp2_crypto_aead_ctx_free(&aead_ctx);
+
+ return spktlen;
+}
+
+ngtcp2_ssize ngtcp2_crypto_write_retry(uint8_t *dest, size_t destlen,
+ uint32_t version, const ngtcp2_cid *dcid,
+ const ngtcp2_cid *scid,
+ const ngtcp2_cid *odcid,
+ const uint8_t *token, size_t tokenlen) {
+ ngtcp2_crypto_aead aead;
+ ngtcp2_ssize spktlen;
+ ngtcp2_crypto_aead_ctx aead_ctx = {0};
+ const uint8_t *key;
+ size_t noncelen;
+
+ ngtcp2_crypto_aead_retry(&aead);
+
+ switch (version) {
+ case NGTCP2_PROTO_VER_V1:
+ key = (const uint8_t *)NGTCP2_RETRY_KEY_V1;
+ noncelen = sizeof(NGTCP2_RETRY_NONCE_V1) - 1;
+ break;
+ case NGTCP2_PROTO_VER_V2_DRAFT:
+ key = (const uint8_t *)NGTCP2_RETRY_KEY_V2_DRAFT;
+ noncelen = sizeof(NGTCP2_RETRY_NONCE_V2_DRAFT) - 1;
+ break;
+ default:
+ key = (const uint8_t *)NGTCP2_RETRY_KEY_DRAFT;
+ noncelen = sizeof(NGTCP2_RETRY_NONCE_DRAFT) - 1;
+ }
+
+ if (ngtcp2_crypto_aead_ctx_encrypt_init(&aead_ctx, &aead, key, noncelen) !=
+ 0) {
+ return -1;
+ }
+
+ spktlen = ngtcp2_pkt_write_retry(dest, destlen, version, dcid, scid, odcid,
+ token, tokenlen, ngtcp2_crypto_encrypt_cb,
+ &aead, &aead_ctx);
+ if (spktlen < 0) {
+ spktlen = -1;
+ }
+
+ ngtcp2_crypto_aead_ctx_free(&aead_ctx);
+
+ return spktlen;
+}
+
+int ngtcp2_crypto_client_initial_cb(ngtcp2_conn *conn, void *user_data) {
+ const ngtcp2_cid *dcid = ngtcp2_conn_get_dcid(conn);
+ void *tls = ngtcp2_conn_get_tls_native_handle(conn);
+ (void)user_data;
+
+ if (ngtcp2_crypto_derive_and_install_initial_key(
+ conn, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ ngtcp2_conn_get_client_chosen_version(conn), dcid) != 0) {
+ return NGTCP2_ERR_CALLBACK_FAILURE;
+ }
+
+ if (crypto_set_local_transport_params(conn, tls) != 0) {
+ return NGTCP2_ERR_CALLBACK_FAILURE;
+ }
+
+ if (ngtcp2_crypto_read_write_crypto_data(conn, NGTCP2_CRYPTO_LEVEL_INITIAL,
+ NULL, 0) != 0) {
+ return NGTCP2_ERR_CALLBACK_FAILURE;
+ }
+
+ return 0;
+}
+
+int ngtcp2_crypto_recv_retry_cb(ngtcp2_conn *conn, const ngtcp2_pkt_hd *hd,
+ void *user_data) {
+ (void)user_data;
+
+ if (ngtcp2_crypto_derive_and_install_initial_key(
+ conn, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ ngtcp2_conn_get_client_chosen_version(conn), &hd->scid) != 0) {
+ return NGTCP2_ERR_CALLBACK_FAILURE;
+ }
+
+ return 0;
+}
+
+int ngtcp2_crypto_recv_client_initial_cb(ngtcp2_conn *conn,
+ const ngtcp2_cid *dcid,
+ void *user_data) {
+ (void)user_data;
+
+ if (ngtcp2_crypto_derive_and_install_initial_key(
+ conn, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ ngtcp2_conn_get_client_chosen_version(conn), dcid) != 0) {
+ return NGTCP2_ERR_CALLBACK_FAILURE;
+ }
+
+ return 0;
+}
+
+int ngtcp2_crypto_version_negotiation_cb(ngtcp2_conn *conn, uint32_t version,
+ const ngtcp2_cid *client_dcid,
+ void *user_data) {
+ (void)user_data;
+
+ if (ngtcp2_crypto_derive_and_install_vneg_initial_key(
+ conn, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, version,
+ client_dcid) != 0) {
+ return NGTCP2_ERR_CALLBACK_FAILURE;
+ }
+
+ return 0;
+}
+
+void ngtcp2_crypto_delete_crypto_aead_ctx_cb(ngtcp2_conn *conn,
+ ngtcp2_crypto_aead_ctx *aead_ctx,
+ void *user_data) {
+ (void)conn;
+ (void)user_data;
+
+ ngtcp2_crypto_aead_ctx_free(aead_ctx);
+}
+
+void ngtcp2_crypto_delete_crypto_cipher_ctx_cb(
+ ngtcp2_conn *conn, ngtcp2_crypto_cipher_ctx *cipher_ctx, void *user_data) {
+ (void)conn;
+ (void)user_data;
+
+ ngtcp2_crypto_cipher_ctx_free(cipher_ctx);
+}
+
+int ngtcp2_crypto_recv_crypto_data_cb(ngtcp2_conn *conn,
+ ngtcp2_crypto_level crypto_level,
+ uint64_t offset, const uint8_t *data,
+ size_t datalen, void *user_data) {
+ int rv;
+ (void)offset;
+ (void)user_data;
+
+ if (ngtcp2_crypto_read_write_crypto_data(conn, crypto_level, data, datalen) !=
+ 0) {
+ rv = ngtcp2_conn_get_tls_error(conn);
+ if (rv) {
+ return rv;
+ }
+ return NGTCP2_ERR_CRYPTO;
+ }
+
+ return 0;
+}