const unsigned char *hash,
unsigned char *out, size_t outlen)
{
- const unsigned char label_prefix[] = "TLS 1.3, ";
+ const unsigned char label_prefix[] = "tls13 ";
EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
int ret;
size_t hkdflabellen;
size_t mdlen, prevsecretlen;
int ret;
EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
+ static const char derived_secret_label[] = "derived";
+ unsigned char preextractsec[EVP_MAX_MD_SIZE];
if (pctx == NULL)
return 0;
prevsecret = default_zeros;
prevsecretlen = 0;
} else {
+ EVP_MD_CTX *mctx = EVP_MD_CTX_new();
+ unsigned char hash[EVP_MAX_MD_SIZE];
+
+ /* The pre-extract derive step uses a hash of no messages */
+ if (mctx == NULL
+ || EVP_DigestInit_ex(mctx, md, NULL) <= 0
+ || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
+ EVP_MD_CTX_free(mctx);
+ EVP_PKEY_CTX_free(pctx);
+ return 0;
+ }
+ EVP_MD_CTX_free(mctx);
+
+ /* Generate the pre-extract secret */
+ if (!tls13_hkdf_expand(s, md, prevsecret,
+ (unsigned char *)derived_secret_label,
+ sizeof(derived_secret_label) - 1, hash,
+ preextractsec, mdlen)) {
+ EVP_PKEY_CTX_free(pctx);
+ return 0;
+ }
+
+ prevsecret = preextractsec;
prevsecretlen = mdlen;
}
<= 0;
EVP_PKEY_CTX_free(pctx);
+ if (prevsecret == preextractsec)
+ OPENSSL_cleanse(preextractsec, mdlen);
return ret == 0;
}
return 1;
}
-static int derive_secret_key_and_iv(SSL *s, int send, const EVP_MD *md,
+static int derive_secret_key_and_iv(SSL *s, int sending, const EVP_MD *md,
const EVP_CIPHER *ciph,
const unsigned char *insecret,
const unsigned char *hash,
goto err;
}
- if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, send) <= 0
+ if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, sending) <= 0
|| !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL)
|| (taglen != 0 && !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG,
taglen, NULL))
goto err;
}
-#ifdef OPENSSL_SSL_TRACE_CRYPTO
- if (s->msg_callback) {
- int wh = send ? TLS1_RT_CRYPTO_WRITE : 0;
-
- if (ciph->key_len)
- s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
- key, ciph->key_len, s, s->msg_callback_arg);
-
- wh |= TLS1_RT_CRYPTO_IV;
- s->msg_callback(2, s->version, wh, iv, ivlen, s,
- s->msg_callback_arg);
- }
-#endif
-
return 1;
err:
OPENSSL_cleanse(key, sizeof(key));
int tls13_change_cipher_state(SSL *s, int which)
{
- static const unsigned char client_early_traffic[] =
- "client early traffic secret";
- static const unsigned char client_handshake_traffic[] =
- "client handshake traffic secret";
- static const unsigned char client_application_traffic[] =
- "client application traffic secret";
- static const unsigned char server_handshake_traffic[] =
- "server handshake traffic secret";
- static const unsigned char server_application_traffic[] =
- "server application traffic secret";
- static const unsigned char resumption_master_secret[] =
- "resumption master secret";
+ static const unsigned char client_early_traffic[] = "c e traffic";
+ static const unsigned char client_handshake_traffic[] = "c hs traffic";
+ static const unsigned char client_application_traffic[] = "c ap traffic";
+ static const unsigned char server_handshake_traffic[] = "s hs traffic";
+ static const unsigned char server_application_traffic[] = "s ap traffic";
+ static const unsigned char exporter_master_secret[] = "exp master";
+ static const unsigned char resumption_master_secret[] = "res master";
unsigned char *iv;
unsigned char secret[EVP_MAX_MD_SIZE];
unsigned char hashval[EVP_MAX_MD_SIZE];
const unsigned char *label;
size_t labellen, hashlen = 0;
int ret = 0;
- const EVP_MD *md;
- const EVP_CIPHER *cipher;
+ const EVP_MD *md = NULL;
+ const EVP_CIPHER *cipher = NULL;
if (which & SSL3_CC_READ) {
if (s->enc_read_ctx != NULL) {
labellen = sizeof(client_handshake_traffic) - 1;
log_label = CLIENT_HANDSHAKE_LABEL;
/*
- * The hanshake hash used for the server read/client write handshake
+ * The handshake hash used for the server read/client write handshake
* traffic secret is the same as the hash for the server
* write/client read handshake traffic secret. However, if we
* processed early data then we delay changing the server
goto err;
}
s->session->master_key_length = hashlen;
+
+ /* Now we create the exporter master secret */
+ if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
+ exporter_master_secret,
+ sizeof(exporter_master_secret) - 1,
+ hash, s->exporter_master_secret, hashlen)) {
+ SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
}
if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher,
return ret;
}
-int tls13_update_key(SSL *s, int send)
+int tls13_update_key(SSL *s, int sending)
{
- static const unsigned char application_traffic[] =
- "application traffic secret";
+ static const unsigned char application_traffic[] = "traffic upd";
const EVP_MD *md = ssl_handshake_md(s);
size_t hashlen = EVP_MD_size(md);
unsigned char *insecret, *iv;
EVP_CIPHER_CTX *ciph_ctx;
int ret = 0;
- if (s->server == send)
+ if (s->server == sending)
insecret = s->server_app_traffic_secret;
else
insecret = s->client_app_traffic_secret;
- if (send) {
+ if (sending) {
iv = s->write_iv;
ciph_ctx = s->enc_write_ctx;
RECORD_LAYER_reset_write_sequence(&s->rlayer);
RECORD_LAYER_reset_read_sequence(&s->rlayer);
}
- if (!derive_secret_key_and_iv(s, send, ssl_handshake_md(s),
+ if (!derive_secret_key_and_iv(s, sending, ssl_handshake_md(s),
s->s3->tmp.new_sym_enc, insecret, NULL,
application_traffic,
sizeof(application_traffic) - 1, secret, iv,
int tls13_alert_code(int code)
{
- if (code == SSL_AD_MISSING_EXTENSION || code == SSL_AD_END_OF_EARLY_DATA)
+ if (code == SSL_AD_MISSING_EXTENSION)
return code;
return tls1_alert_code(code);
}
+
+int tls13_export_keying_material(SSL *s, unsigned char *out, size_t olen,
+ const char *label, size_t llen,
+ const unsigned char *context,
+ size_t contextlen, int use_context)
+{
+ unsigned char exportsecret[EVP_MAX_MD_SIZE];
+ static const unsigned char exporterlabel[] = "exporter";
+ unsigned char hash[EVP_MAX_MD_SIZE];
+ const EVP_MD *md = ssl_handshake_md(s);
+ EVP_MD_CTX *ctx = EVP_MD_CTX_new();
+ unsigned int hashsize;
+ int ret = 0;
+
+ if (ctx == NULL || !SSL_is_init_finished(s))
+ goto err;
+
+ if (!use_context)
+ contextlen = 0;
+
+ if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
+ || EVP_DigestUpdate(ctx, context, contextlen) <= 0
+ || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
+ || !tls13_hkdf_expand(s, md, s->exporter_master_secret,
+ (const unsigned char *)label, llen, NULL,
+ exportsecret, 0)
+ || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
+ sizeof(exporterlabel) - 1, hash, out, olen))
+ goto err;
+
+ ret = 1;
+ err:
+ EVP_MD_CTX_free(ctx);
+ return ret;
+}
projects / openssl.git / blobdiff