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boringssl / boringssl / e2e13265ff9cb637f8d0cdefc27b13370848472f / . / ssl / ssl_locl.h
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
* ECC cipher suite support in OpenSSL originally developed by
* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
*/
/* ====================================================================
* Copyright 2005 Nokia. All rights reserved.
*
* The portions of the attached software ("Contribution") is developed by
* Nokia Corporation and is licensed pursuant to the OpenSSL open source
* license.
*
* The Contribution, originally written by Mika Kousa and Pasi Eronen of
* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
* support (see RFC 4279) to OpenSSL.
*
* No patent licenses or other rights except those expressly stated in
* the OpenSSL open source license shall be deemed granted or received
* expressly, by implication, estoppel, or otherwise.
*
* No assurances are provided by Nokia that the Contribution does not
* infringe the patent or other intellectual property rights of any third
* party or that the license provides you with all the necessary rights
* to make use of the Contribution.
*
* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
* OTHERWISE.
*/
#ifndef HEADER_SSL_LOCL_H
#define HEADER_SSL_LOCL_H
#include <openssl/base.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <openssl/aead.h>
#include <openssl/bio.h>
#include <openssl/buf.h>
#include <openssl/dsa.h>
#include <openssl/err.h>
#include <openssl/rsa.h>
#include <openssl/ssl.h>
#include <openssl/stack.h>
#define c2l(c, l) \
(l = ((unsigned long)(*((c)++))), l |= (((unsigned long)(*((c)++))) << 8), \
l |= (((unsigned long)(*((c)++))) << 16), \
l |= (((unsigned long)(*((c)++))) << 24))
/* NOTE - c is not incremented as per c2l */
#define c2ln(c, l1, l2, n) \
{ \
c += n; \
l1 = l2 = 0; \
switch (n) { \
case 8: \
l2 = ((unsigned long)(*(--(c)))) << 24; \
case 7: \
l2 |= ((unsigned long)(*(--(c)))) << 16; \
case 6: \
l2 |= ((unsigned long)(*(--(c)))) << 8; \
case 5: \
l2 |= ((unsigned long)(*(--(c)))); \
case 4: \
l1 = ((unsigned long)(*(--(c)))) << 24; \
case 3: \
l1 |= ((unsigned long)(*(--(c)))) << 16; \
case 2: \
l1 |= ((unsigned long)(*(--(c)))) << 8; \
case 1: \
l1 |= ((unsigned long)(*(--(c)))); \
} \
}
#define l2c(l, c) \
(*((c)++) = (uint8_t)(((l)) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 8) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 16) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 24) & 0xff))
#define n2l(c, l) \
(l = ((unsigned long)(*((c)++))) << 24, \
l |= ((unsigned long)(*((c)++))) << 16, \
l |= ((unsigned long)(*((c)++))) << 8, l |= ((unsigned long)(*((c)++))))
#define l2n(l, c) \
(*((c)++) = (uint8_t)(((l) >> 24) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 16) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 8) & 0xff), \
*((c)++) = (uint8_t)(((l)) & 0xff))
#define l2n8(l, c) \
(*((c)++) = (uint8_t)(((l) >> 56) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 48) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 40) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 32) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 24) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 16) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 8) & 0xff), \
*((c)++) = (uint8_t)(((l)) & 0xff))
/* NOTE - c is not incremented as per l2c */
#define l2cn(l1, l2, c, n) \
{ \
c += n; \
switch (n) { \
case 8: \
*(--(c)) = (uint8_t)(((l2) >> 24) & 0xff); \
case 7: \
*(--(c)) = (uint8_t)(((l2) >> 16) & 0xff); \
case 6: \
*(--(c)) = (uint8_t)(((l2) >> 8) & 0xff); \
case 5: \
*(--(c)) = (uint8_t)(((l2)) & 0xff); \
case 4: \
*(--(c)) = (uint8_t)(((l1) >> 24) & 0xff); \
case 3: \
*(--(c)) = (uint8_t)(((l1) >> 16) & 0xff); \
case 2: \
*(--(c)) = (uint8_t)(((l1) >> 8) & 0xff); \
case 1: \
*(--(c)) = (uint8_t)(((l1)) & 0xff); \
} \
}
#define n2s(c, s) \
((s = (((unsigned int)(c[0])) << 8) | (((unsigned int)(c[1])))), c += 2)
#define s2n(s, c) \
((c[0] = (uint8_t)(((s) >> 8) & 0xff), \
c[1] = (uint8_t)(((s)) & 0xff)), \
c += 2)
#define n2l3(c, l) \
((l = (((unsigned long)(c[0])) << 16) | (((unsigned long)(c[1])) << 8) | \
(((unsigned long)(c[2])))), \
c += 3)
#define l2n3(l, c) \
((c[0] = (uint8_t)(((l) >> 16) & 0xff), \
c[1] = (uint8_t)(((l) >> 8) & 0xff), \
c[2] = (uint8_t)(((l)) & 0xff)), \
c += 3)
/* LOCAL STUFF */
#define SSL_DECRYPT 0
#define SSL_ENCRYPT 1
#define TWO_BYTE_BIT 0x80
#define SEC_ESC_BIT 0x40
#define TWO_BYTE_MASK 0x7fff
#define THREE_BYTE_MASK 0x3fff
#define INC32(a) ((a) = ((a) + 1) & 0xffffffffL)
#define DEC32(a) ((a) = ((a)-1) & 0xffffffffL)
#define MAX_MAC_SIZE 20 /* up from 16 for SSLv3 */
/* Define the Bitmasks for SSL_CIPHER.algorithms.
*
* This bits are used packed as dense as possible. If new methods/ciphers etc
* will be added, the bits a likely to change, so this information is for
* internal library use only, even though SSL_CIPHER.algorithms can be publicly
* accessed. Use the according functions for cipher management instead.
*
* The bit mask handling in the selection and sorting scheme in
* ssl_create_cipher_list() has only limited capabilities, reflecting that the
* different entities within are mutually exclusive:
* ONLY ONE BIT PER MASK CAN BE SET AT A TIME. */
/* Bits for algorithm_mkey (key exchange algorithm) */
#define SSL_kRSA 0x00000001L /* RSA key exchange */
#define SSL_kDHE 0x00000002L /* tmp DH key no DH cert */
#define SSL_kECDHE 0x00000004L /* ephemeral ECDH */
#define SSL_kPSK 0x00000008L /* PSK */
/* Bits for algorithm_auth (server authentication) */
#define SSL_aRSA 0x00000001L /* RSA auth */
#define SSL_aNULL 0x00000002L /* no auth (i.e. use ADH or AECDH) */
#define SSL_aECDSA 0x00000004L /* ECDSA auth*/
#define SSL_aPSK 0x00000008L /* PSK auth */
/* Bits for algorithm_enc (symmetric encryption) */
#define SSL_3DES 0x00000001L
#define SSL_RC4 0x00000002L
#define SSL_AES128 0x00000004L
#define SSL_AES256 0x00000008L
#define SSL_AES128GCM 0x00000010L
#define SSL_AES256GCM 0x00000020L
#define SSL_CHACHA20POLY1305 0x00000040L
#define SSL_AES (SSL_AES128 | SSL_AES256 | SSL_AES128GCM | SSL_AES256GCM)
/* Bits for algorithm_mac (symmetric authentication) */
#define SSL_MD5 0x00000001L
#define SSL_SHA1 0x00000002L
#define SSL_SHA256 0x00000004L
#define SSL_SHA384 0x00000008L
/* Not a real MAC, just an indication it is part of cipher */
#define SSL_AEAD 0x00000010L
/* Bits for algorithm_ssl (protocol version) */
#define SSL_SSLV3 0x00000002L
#define SSL_TLSV1 SSL_SSLV3 /* for now */
#define SSL_TLSV1_2 0x00000004L
/* Bits for algorithm2 (handshake digests and other extra flags) */
#define SSL_HANDSHAKE_MAC_MD5 0x10
#define SSL_HANDSHAKE_MAC_SHA 0x20
#define SSL_HANDSHAKE_MAC_SHA256 0x40
#define SSL_HANDSHAKE_MAC_SHA384 0x80
#define SSL_HANDSHAKE_MAC_DEFAULT \
(SSL_HANDSHAKE_MAC_MD5 | SSL_HANDSHAKE_MAC_SHA)
/* When adding new digest in the ssl_ciph.c and increment SSM_MD_NUM_IDX
* make sure to update this constant too */
#define SSL_MAX_DIGEST 4
#define TLS1_PRF_DGST_MASK (0xff << TLS1_PRF_DGST_SHIFT)
#define TLS1_PRF_DGST_SHIFT 10
#define TLS1_PRF_MD5 (SSL_HANDSHAKE_MAC_MD5 << TLS1_PRF_DGST_SHIFT)
#define TLS1_PRF_SHA1 (SSL_HANDSHAKE_MAC_SHA << TLS1_PRF_DGST_SHIFT)
#define TLS1_PRF_SHA256 (SSL_HANDSHAKE_MAC_SHA256 << TLS1_PRF_DGST_SHIFT)
#define TLS1_PRF_SHA384 (SSL_HANDSHAKE_MAC_SHA384 << TLS1_PRF_DGST_SHIFT)
#define TLS1_PRF (TLS1_PRF_MD5 | TLS1_PRF_SHA1)
#define TLSEXT_CHANNEL_ID_SIZE 128
/* SSL_CIPHER_ALGORITHM2_AEAD is a flag in SSL_CIPHER.algorithm2 which
* indicates that the cipher is implemented via an EVP_AEAD. */
#define SSL_CIPHER_ALGORITHM2_AEAD (1 << 23)
/* SSL_CIPHER_ALGORITHM2_VARIABLE_NONCE_INCLUDED_IN_RECORD is a flag in
* SSL_CIPHER.algorithm2 which indicates that the variable part of the nonce is
* included as a prefix of the record. (AES-GCM, for example, does with with an
* 8-byte variable nonce.) */
#define SSL_CIPHER_ALGORITHM2_VARIABLE_NONCE_INCLUDED_IN_RECORD (1<<22)
/* Cipher strength information. */
#define SSL_MEDIUM 0x00000001L
#define SSL_HIGH 0x00000002L
#define SSL_FIPS 0x00000004L
/* we have used 000001ff - 23 bits left to go */
/* Check if an SSL structure is using DTLS */
#define SSL_IS_DTLS(s) (s->method->is_dtls)
/* See if we need explicit IV */
#define SSL_USE_EXPLICIT_IV(s) \
(s->enc_method->enc_flags & SSL_ENC_FLAG_EXPLICIT_IV)
/* See if we use signature algorithms extension and signature algorithm before
* signatures. */
#define SSL_USE_SIGALGS(s) (s->enc_method->enc_flags & SSL_ENC_FLAG_SIGALGS)
/* Allow TLS 1.2 ciphersuites: applies to DTLS 1.2 as well as TLS 1.2: may
* apply to others in future. */
#define SSL_USE_TLS1_2_CIPHERS(s) \
(s->enc_method->enc_flags & SSL_ENC_FLAG_TLS1_2_CIPHERS)
/* Determine if a client can use TLS 1.2 ciphersuites: can't rely on method
* flags because it may not be set to correct version yet. */
#define SSL_CLIENT_USE_TLS1_2_CIPHERS(s) \
((SSL_IS_DTLS(s) && s->client_version <= DTLS1_2_VERSION) || \
(!SSL_IS_DTLS(s) && s->client_version >= TLS1_2_VERSION))
/* Mostly for SSLv3 */
#define SSL_PKEY_RSA_ENC 0
#define SSL_PKEY_RSA_SIGN 1
#define SSL_PKEY_ECC 2
#define SSL_PKEY_NUM 3
/* SSL_kRSA <- RSA_ENC | (RSA_TMP & RSA_SIGN) |
* <- (EXPORT & (RSA_ENC | RSA_TMP) & RSA_SIGN)
* SSL_kDH <- DH_ENC & (RSA_ENC | RSA_SIGN | DSA_SIGN)
* SSL_kDHE <- RSA_ENC | RSA_SIGN | DSA_SIGN
* SSL_aRSA <- RSA_ENC | RSA_SIGN
* SSL_aDSS <- DSA_SIGN */
#define PENDING_SESSION -10000
/* From RFC4492, used in encoding the curve type in ECParameters */
#define EXPLICIT_PRIME_CURVE_TYPE 1
#define EXPLICIT_CHAR2_CURVE_TYPE 2
#define NAMED_CURVE_TYPE 3
enum ssl_hash_message_t {
ssl_dont_hash_message,
ssl_hash_message,
};
typedef struct cert_pkey_st {
X509 *x509;
EVP_PKEY *privatekey;
/* Chain for this certificate */
STACK_OF(X509) * chain;
} CERT_PKEY;
typedef struct cert_st {
/* Current active set */
CERT_PKEY *key; /* ALWAYS points to an element of the pkeys array
* Probably it would make more sense to store
* an index, not a pointer. */
/* For clients the following masks are of *disabled* key and auth algorithms
* based on the current session.
*
* TODO(davidben): Remove these. They get checked twice: when sending the
* ClientHello and when processing the ServerHello. However, mask_ssl is a
* different value both times. mask_k and mask_a are not, but is a
* round-about way of checking the server's cipher was one of the advertised
* ones. (Currently it checks the masks and then the list of ciphers prior to
* applying the masks in ClientHello.) */
unsigned long mask_k;
unsigned long mask_a;
unsigned long mask_ssl;
DH *dh_tmp;
DH *(*dh_tmp_cb)(SSL *ssl, int is_export, int keysize);
EC_KEY *ecdh_tmp;
/* Callback for generating ephemeral ECDH keys */
EC_KEY *(*ecdh_tmp_cb)(SSL *ssl, int is_export, int keysize);
/* Select ECDH parameters automatically */
int ecdh_tmp_auto;
/* Flags related to certificates */
unsigned int cert_flags;
CERT_PKEY pkeys[SSL_PKEY_NUM];
/* Server-only: client_certificate_types is list of certificate types to
* include in the CertificateRequest message.
*/
uint8_t *client_certificate_types;
size_t num_client_certificate_types;
/* signature algorithms peer reports: e.g. supported signature
* algorithms extension for server or as part of a certificate
* request for client. */
uint8_t *peer_sigalgs;
/* Size of above array */
size_t peer_sigalgslen;
/* suppported signature algorithms.
* When set on a client this is sent in the client hello as the
* supported signature algorithms extension. For servers
* it represents the signature algorithms we are willing to use. */
uint8_t *conf_sigalgs;
/* Size of above array */
size_t conf_sigalgslen;
/* Client authentication signature algorithms, if not set then
* uses conf_sigalgs. On servers these will be the signature
* algorithms sent to the client in a cerificate request for TLS 1.2.
* On a client this represents the signature algortithms we are
* willing to use for client authentication. */
uint8_t *client_sigalgs;
/* Size of above array */
size_t client_sigalgslen;
/* Signature algorithms shared by client and server: cached
* because these are used most often. */
TLS_SIGALGS *shared_sigalgs;
size_t shared_sigalgslen;
/* Certificate setup callback: if set is called whenever a
* certificate may be required (client or server). the callback
* can then examine any appropriate parameters and setup any
* certificates required. This allows advanced applications
* to select certificates on the fly: for example based on
* supported signature algorithms or curves. */
int (*cert_cb)(SSL *ssl, void *arg);
void *cert_cb_arg;
/* Optional X509_STORE for chain building or certificate validation
* If NULL the parent SSL_CTX store is used instead. */
X509_STORE *chain_store;
X509_STORE *verify_store;
/* Raw values of the cipher list from a client */
uint8_t *ciphers_raw;
size_t ciphers_rawlen;
} CERT;
typedef struct sess_cert_st {
STACK_OF(X509) * cert_chain; /* as received from peer (not for SSL2) */
/* The 'peer_...' members are used only by clients. */
int peer_cert_type;
CERT_PKEY *peer_key; /* points to an element of peer_pkeys (never NULL!) */
CERT_PKEY peer_pkeys[SSL_PKEY_NUM];
/* Obviously we don't have the private keys of these,
* so maybe we shouldn't even use the CERT_PKEY type here. */
DH *peer_dh_tmp;
EC_KEY *peer_ecdh_tmp;
} SESS_CERT;
/* Structure containing decoded values of signature algorithms extension */
struct tls_sigalgs_st {
/* NID of hash algorithm */
int hash_nid;
/* NID of signature algorithm */
int sign_nid;
/* Combined hash and signature NID */
int signandhash_nid;
/* Raw values used in extension */
uint8_t rsign;
uint8_t rhash;
};
/* SSL_METHOD is a compatibility structure to support the legacy version-locked
* methods. */
struct ssl_method_st {
/* version, if non-zero, is the only protocol version acceptable to an
* SSL_CTX initialized from this method. */
uint16_t version;
/* method is the underlying SSL_PROTOCOL_METHOD that initializes the
* SSL_CTX. */
const SSL_PROTOCOL_METHOD *method;
};
/* Used to hold functions for SSLv2 or SSLv3/TLSv1 functions */
struct ssl_protocol_method_st {
/* is_dtls is one if the protocol is DTLS and zero otherwise. */
char is_dtls;
int (*ssl_new)(SSL *s);
void (*ssl_free)(SSL *s);
int (*ssl_accept)(SSL *s);
int (*ssl_connect)(SSL *s);
int (*ssl_read)(SSL *s, void *buf, int len);
int (*ssl_peek)(SSL *s, void *buf, int len);
int (*ssl_write)(SSL *s, const void *buf, int len);
int (*ssl_shutdown)(SSL *s);
int (*ssl_renegotiate)(SSL *s);
int (*ssl_renegotiate_check)(SSL *s);
long (*ssl_get_message)(SSL *s, int header_state, int body_state,
int msg_type, long max,
enum ssl_hash_message_t hash_message, int *ok);
int (*ssl_read_bytes)(SSL *s, int type, uint8_t *buf, int len, int peek);
int (*ssl_write_bytes)(SSL *s, int type, const void *buf_, int len);
int (*ssl_dispatch_alert)(SSL *s);
long (*ssl_ctrl)(SSL *s, int cmd, long larg, void *parg);
long (*ssl_ctx_ctrl)(SSL_CTX *ctx, int cmd, long larg, void *parg);
int (*ssl_pending)(const SSL *s);
int (*num_ciphers)(void);
const SSL_CIPHER *(*get_cipher)(unsigned ncipher);
long (*ssl_callback_ctrl)(SSL *s, int cb_id, void (*fp)(void));
long (*ssl_ctx_callback_ctrl)(SSL_CTX *s, int cb_id, void (*fp)(void));
/* Handshake header length */
unsigned int hhlen;
/* Set the handshake header */
int (*set_handshake_header)(SSL *s, int type, unsigned long len);
/* Write out handshake message */
int (*do_write)(SSL *s);
};
/* This is for the SSLv3/TLSv1.0 differences in crypto/hash stuff It is a bit
* of a mess of functions, but hell, think of it as an opaque structure. */
struct ssl3_enc_method {
int (*enc)(SSL *, int);
int (*prf)(SSL *, uint8_t *, size_t, const uint8_t *, size_t, const char *,
size_t, const uint8_t *, size_t, const uint8_t *, size_t);
int (*setup_key_block)(SSL *);
int (*generate_master_secret)(SSL *, uint8_t *, const uint8_t *, size_t);
int (*change_cipher_state)(SSL *, int);
int (*final_finish_mac)(SSL *, const char *, int, uint8_t *);
int (*cert_verify_mac)(SSL *, int, uint8_t *);
const char *client_finished_label;
int client_finished_label_len;
const char *server_finished_label;
int server_finished_label_len;
int (*alert_value)(int);
int (*export_keying_material)(SSL *, uint8_t *, size_t, const char *, size_t,
const uint8_t *, size_t, int use_context);
/* Various flags indicating protocol version requirements */
unsigned int enc_flags;
};
#define SSL_HM_HEADER_LENGTH(s) s->method->hhlen
#define ssl_handshake_start(s) \
(((uint8_t *)s->init_buf->data) + s->method->hhlen)
#define ssl_set_handshake_header(s, htype, len) \
s->method->set_handshake_header(s, htype, len)
#define ssl_do_write(s) s->method->do_write(s)
/* Values for enc_flags */
/* Uses explicit IV for CBC mode */
#define SSL_ENC_FLAG_EXPLICIT_IV 0x1
/* Uses signature algorithms extension */
#define SSL_ENC_FLAG_SIGALGS 0x2
/* Uses SHA256 default PRF */
#define SSL_ENC_FLAG_SHA256_PRF 0x4
/* Allow TLS 1.2 ciphersuites: applies to DTLS 1.2 as well as TLS 1.2:
* may apply to others in future. */
#define SSL_ENC_FLAG_TLS1_2_CIPHERS 0x8
/* ssl_aead_ctx_st contains information about an AEAD that is being used to
* encrypt an SSL connection. */
struct ssl_aead_ctx_st {
EVP_AEAD_CTX ctx;
/* fixed_nonce contains any bytes of the nonce that are fixed for all
* records. */
uint8_t fixed_nonce[8];
uint8_t fixed_nonce_len, variable_nonce_len, tag_len;
/* variable_nonce_included_in_record is non-zero if the variable nonce
* for a record is included as a prefix before the ciphertext. */
char variable_nonce_included_in_record;
/* random_variable_nonce is non-zero if the variable nonce is
* randomly generated, rather than derived from the sequence
* number. */
char random_variable_nonce;
/* omit_length_in_ad is non-zero if the length should be omitted in the
* AEAD's ad parameter. */
char omit_length_in_ad;
/* omit_version_in_ad is non-zero if the version should be omitted
* in the AEAD's ad parameter. */
char omit_version_in_ad;
};
extern const SSL_CIPHER ssl3_ciphers[];
extern const SSL3_ENC_METHOD TLSv1_enc_data;
extern const SSL3_ENC_METHOD TLSv1_1_enc_data;
extern const SSL3_ENC_METHOD TLSv1_2_enc_data;
extern const SSL3_ENC_METHOD SSLv3_enc_data;
void ssl_clear_cipher_ctx(SSL *s);
int ssl_clear_bad_session(SSL *s);
CERT *ssl_cert_new(void);
CERT *ssl_cert_dup(CERT *cert);
void ssl_cert_clear_certs(CERT *c);
void ssl_cert_free(CERT *c);
SESS_CERT *ssl_sess_cert_new(void);
void ssl_sess_cert_free(SESS_CERT *sc);
int ssl_set_peer_cert_type(SESS_CERT *c, int type);
int ssl_get_prev_session(SSL *s, const struct ssl_early_callback_ctx *ctx);
int ssl_cipher_id_cmp(const void *in_a, const void *in_b);
int ssl_cipher_ptr_id_cmp(const SSL_CIPHER **ap, const SSL_CIPHER **bp);
STACK_OF(SSL_CIPHER) * ssl_bytes_to_cipher_list(SSL *s, const CBS *cbs);
int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) * sk, uint8_t *p);
STACK_OF(SSL_CIPHER) *
ssl_create_cipher_list(const SSL_PROTOCOL_METHOD *meth,
struct ssl_cipher_preference_list_st **pref,
STACK_OF(SSL_CIPHER) * *sorted, const char *rule_str,
CERT *c);
struct ssl_cipher_preference_list_st *ssl_cipher_preference_list_dup(
struct ssl_cipher_preference_list_st *cipher_list);
void ssl_cipher_preference_list_free(
struct ssl_cipher_preference_list_st *cipher_list);
struct ssl_cipher_preference_list_st *ssl_cipher_preference_list_from_ciphers(
STACK_OF(SSL_CIPHER) * ciphers);
struct ssl_cipher_preference_list_st *ssl_get_cipher_preferences(SSL *s);
/* ssl_cipher_get_evp_aead sets |*out_aead| to point to the correct EVP_AEAD
* object for |cipher| protocol version |version|. It sets |*out_mac_secret_len|
* and |*out_fixed_iv_len| to the MAC key length and fixed IV length,
* respectively. The MAC key length is zero except for legacy block and stream
* ciphers. It returns 1 on success and 0 on error. */
int ssl_cipher_get_evp_aead(const EVP_AEAD **out_aead,
size_t *out_mac_secret_len,
size_t *out_fixed_iv_len,
const SSL_CIPHER *cipher, uint16_t version);
int ssl_get_handshake_digest(size_t i, long *mask, const EVP_MD **md);
int ssl_cipher_get_cert_index(const SSL_CIPHER *c);
int ssl_cipher_has_server_public_key(const SSL_CIPHER *cipher);
int ssl_cipher_requires_server_key_exchange(const SSL_CIPHER *cipher);
int ssl_cert_set0_chain(CERT *c, STACK_OF(X509) * chain);
int ssl_cert_set1_chain(CERT *c, STACK_OF(X509) * chain);
int ssl_cert_add0_chain_cert(CERT *c, X509 *x);
int ssl_cert_add1_chain_cert(CERT *c, X509 *x);
int ssl_cert_select_current(CERT *c, X509 *x);
void ssl_cert_set_cert_cb(CERT *c, int (*cb)(SSL *ssl, void *arg), void *arg);
int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) * sk);
int ssl_add_cert_chain(SSL *s, CERT_PKEY *cpk, unsigned long *l);
int ssl_build_cert_chain(CERT *c, X509_STORE *chain_store, int flags);
int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref);
int ssl_undefined_function(SSL *s);
int ssl_undefined_void_function(void);
int ssl_undefined_const_function(const SSL *s);
CERT_PKEY *ssl_get_server_send_pkey(const SSL *s);
EVP_PKEY *ssl_get_sign_pkey(SSL *s, const SSL_CIPHER *c);
int ssl_cert_type(EVP_PKEY *pkey);
/* ssl_get_compatible_server_ciphers determines the key exchange and
* authentication cipher suite masks compatible with the server configuration
* and current ClientHello parameters of |s|. It sets |*out_mask_k| to the key
* exchange mask and |*out_mask_a| to the authentication mask. */
void ssl_get_compatible_server_ciphers(SSL *s, unsigned long *out_mask_k,
unsigned long *out_mask_a);
STACK_OF(SSL_CIPHER) * ssl_get_ciphers_by_id(SSL *s);
int ssl_verify_alarm_type(long type);
int ssl_fill_hello_random(SSL *s, int server, uint8_t *field, size_t len);
const SSL_CIPHER *ssl3_get_cipher_by_value(uint16_t value);
uint16_t ssl3_get_cipher_value(const SSL_CIPHER *c);
int ssl3_init_finished_mac(SSL *s);
int ssl3_send_server_certificate(SSL *s);
int ssl3_send_new_session_ticket(SSL *s);
int ssl3_send_cert_status(SSL *s);
int ssl3_get_finished(SSL *s, int state_a, int state_b);
int ssl3_send_change_cipher_spec(SSL *s, int state_a, int state_b);
int ssl3_prf(SSL *s, uint8_t *out, size_t out_len, const uint8_t *secret,
size_t secret_len, const char *label, size_t label_len,
const uint8_t *seed1, size_t seed1_len,
const uint8_t *seed2, size_t seed2_len);
void ssl3_cleanup_key_block(SSL *s);
int ssl3_do_write(SSL *s, int type);
int ssl3_send_alert(SSL *s, int level, int desc);
int ssl3_get_req_cert_type(SSL *s, uint8_t *p);
long ssl3_get_message(SSL *s, int header_state, int body_state, int msg_type,
long max, enum ssl_hash_message_t hash_message, int *ok);
/* ssl3_hash_current_message incorporates the current handshake message into the
* handshake hash. It returns one on success and zero on allocation failure. */
int ssl3_hash_current_message(SSL *s);
/* ssl3_cert_verify_hash writes the CertificateVerify hash into the bytes
* pointed to by |out| and writes the number of bytes to |*out_len|. |out| must
* have room for EVP_MAX_MD_SIZE bytes. For TLS 1.2 and up, |*out_md| is used
* for the hash function, otherwise the hash function depends on the type of
* |pkey| and is written to |*out_md|. It returns one on success and zero on
* failure. */
int ssl3_cert_verify_hash(SSL *s, uint8_t *out, size_t *out_len,
const EVP_MD **out_md, EVP_PKEY *pkey);
int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen);
int ssl3_num_ciphers(void);
const SSL_CIPHER *ssl3_get_cipher(unsigned int u);
int ssl3_renegotiate(SSL *ssl);
int ssl3_renegotiate_check(SSL *ssl);
int ssl3_dispatch_alert(SSL *s);
int ssl3_expect_change_cipher_spec(SSL *s);
int ssl3_read_bytes(SSL *s, int type, uint8_t *buf, int len, int peek);
int ssl3_write_bytes(SSL *s, int type, const void *buf, int len);
int ssl3_final_finish_mac(SSL *s, const char *sender, int slen, uint8_t *p);
int ssl3_cert_verify_mac(SSL *s, int md_nid, uint8_t *p);
int ssl3_finish_mac(SSL *s, const uint8_t *buf, int len);
void ssl3_free_digest_list(SSL *s);
int ssl3_output_cert_chain(SSL *s, CERT_PKEY *cpk);
const SSL_CIPHER *ssl3_choose_cipher(
SSL *ssl, STACK_OF(SSL_CIPHER) * clnt,
struct ssl_cipher_preference_list_st *srvr);
int ssl3_setup_buffers(SSL *s);
int ssl3_setup_read_buffer(SSL *s);
int ssl3_setup_write_buffer(SSL *s);
int ssl3_release_read_buffer(SSL *s);
int ssl3_release_write_buffer(SSL *s);
enum should_free_handshake_buffer_t {
free_handshake_buffer,
dont_free_handshake_buffer,
};
int ssl3_digest_cached_records(SSL *s, enum should_free_handshake_buffer_t);
int ssl3_new(SSL *s);
void ssl3_free(SSL *s);
int ssl3_accept(SSL *s);
int ssl3_connect(SSL *s);
int ssl3_read(SSL *s, void *buf, int len);
int ssl3_peek(SSL *s, void *buf, int len);
int ssl3_write(SSL *s, const void *buf, int len);
int ssl3_shutdown(SSL *s);
long ssl3_ctrl(SSL *s, int cmd, long larg, void *parg);
long ssl3_ctx_ctrl(SSL_CTX *s, int cmd, long larg, void *parg);
long ssl3_callback_ctrl(SSL *s, int cmd, void (*fp)(void));
long ssl3_ctx_callback_ctrl(SSL_CTX *s, int cmd, void (*fp)(void));
int ssl3_pending(const SSL *s);
void ssl3_record_sequence_update(uint8_t *seq);
int ssl3_do_change_cipher_spec(SSL *ssl);
int ssl3_set_handshake_header(SSL *s, int htype, unsigned long len);
int ssl3_handshake_write(SSL *s);
int dtls1_do_write(SSL *s, int type);
int ssl3_read_n(SSL *s, int n, int max, int extend);
int dtls1_read_bytes(SSL *s, int type, uint8_t *buf, int len, int peek);
int ssl3_write_pending(SSL *s, int type, const uint8_t *buf, unsigned int len);
void dtls1_set_message_header(SSL *s, uint8_t mt, unsigned long len,
unsigned short seq_num, unsigned long frag_off,
unsigned long frag_len);
int dtls1_write_app_data_bytes(SSL *s, int type, const void *buf, int len);
int dtls1_write_bytes(SSL *s, int type, const void *buf, int len);
int dtls1_send_change_cipher_spec(SSL *s, int a, int b);
int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen);
int dtls1_read_failed(SSL *s, int code);
int dtls1_buffer_message(SSL *s, int ccs);
int dtls1_get_queue_priority(unsigned short seq, int is_ccs);
int dtls1_retransmit_buffered_messages(SSL *s);
void dtls1_clear_record_buffer(SSL *s);
void dtls1_get_message_header(uint8_t *data, struct hm_header_st *msg_hdr);
void dtls1_reset_seq_numbers(SSL *s, int rw);
int dtls1_check_timeout_num(SSL *s);
int dtls1_handle_timeout(SSL *s);
int dtls1_set_handshake_header(SSL *s, int type, unsigned long len);
int dtls1_handshake_write(SSL *s);
const SSL_CIPHER *dtls1_get_cipher(unsigned int u);
void dtls1_start_timer(SSL *s);
void dtls1_stop_timer(SSL *s);
int dtls1_is_timer_expired(SSL *s);
void dtls1_double_timeout(SSL *s);
unsigned int dtls1_min_mtu(void);
void dtls1_hm_fragment_free(hm_fragment *frag);
/* some client-only functions */
int ssl3_send_client_hello(SSL *s);
int ssl3_get_server_hello(SSL *s);
int ssl3_get_certificate_request(SSL *s);
int ssl3_get_new_session_ticket(SSL *s);
int ssl3_get_cert_status(SSL *s);
int ssl3_get_server_done(SSL *s);
int ssl3_send_cert_verify(SSL *s);
int ssl3_send_client_certificate(SSL *s);
int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
int ssl3_send_client_key_exchange(SSL *s);
int ssl3_get_server_key_exchange(SSL *s);
int ssl3_get_server_certificate(SSL *s);
int ssl3_check_cert_and_algorithm(SSL *s);
int ssl3_send_next_proto(SSL *s);
int ssl3_send_channel_id(SSL *s);
int dtls1_client_hello(SSL *s);
/* some server-only functions */
int ssl3_get_initial_bytes(SSL *s);
int ssl3_get_v2_client_hello(SSL *s);
int ssl3_get_client_hello(SSL *s);
int ssl3_send_server_hello(SSL *s);
int ssl3_send_hello_request(SSL *s);
int ssl3_send_server_key_exchange(SSL *s);
int ssl3_send_certificate_request(SSL *s);
int ssl3_send_server_done(SSL *s);
int ssl3_get_client_certificate(SSL *s);
int ssl3_get_client_key_exchange(SSL *s);
int ssl3_get_cert_verify(SSL *s);
int ssl3_get_next_proto(SSL *s);
int ssl3_get_channel_id(SSL *s);
int dtls1_new(SSL *s);
int dtls1_accept(SSL *s);
int dtls1_connect(SSL *s);
void dtls1_free(SSL *s);
long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg);
int dtls1_shutdown(SSL *s);
long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max,
enum ssl_hash_message_t hash_message, int *ok);
int dtls1_get_record(SSL *s);
int dtls1_dispatch_alert(SSL *s);
int ssl_init_wbio_buffer(SSL *s, int push);
void ssl_free_wbio_buffer(SSL *s);
/* tls1_prf computes the TLS PRF function for |s| as described in RFC 5246,
* section 5 and RFC 2246 section 5. It writes |out_len| bytes to |out|, using
* |secret| as the secret and |label| as the label. |seed1| and |seed2| are
* concatenated to form the seed parameter. It returns one on success and zero
* on failure. */
int tls1_prf(SSL *s, uint8_t *out, size_t out_len, const uint8_t *secret,
size_t secret_len, const char *label, size_t label_len,
const uint8_t *seed1, size_t seed1_len,
const uint8_t *seed2, size_t seed2_len);
int tls1_change_cipher_state(SSL *s, int which);
int tls1_setup_key_block(SSL *s);
int tls1_enc(SSL *s, int snd);
int tls1_handshake_digest(SSL *s, uint8_t *out, size_t out_len);
int tls1_final_finish_mac(SSL *s, const char *str, int slen, uint8_t *p);
int tls1_cert_verify_mac(SSL *s, int md_nid, uint8_t *p);
int tls1_generate_master_secret(SSL *s, uint8_t *out, const uint8_t *premaster,
size_t premaster_len);
int tls1_export_keying_material(SSL *s, uint8_t *out, size_t olen,
const char *label, size_t llen,
const uint8_t *p, size_t plen, int use_context);
int tls1_alert_code(int code);
int ssl3_alert_code(int code);
int ssl_ok(SSL *s);
int ssl_check_srvr_ecc_cert_and_alg(X509 *x, SSL *s);
char ssl_early_callback_init(struct ssl_early_callback_ctx *ctx);
int tls1_ec_curve_id2nid(uint16_t curve_id);
int tls1_ec_nid2curve_id(uint16_t *out_curve_id, int nid);
/* tls1_check_curve parses ECParameters out of |cbs|, modifying it. It
* checks the curve is one of our preferences and writes the
* NamedCurve value to |*out_curve_id|. It returns one on success and
* zero on error. */
int tls1_check_curve(SSL *s, CBS *cbs, uint16_t *out_curve_id);
/* tls1_get_shared_curve returns the NID of the first preferred shared curve
* between client and server preferences. If none can be found, it returns
* NID_undef. */
int tls1_get_shared_curve(SSL *s);
/* tls1_set_curves converts the array of |ncurves| NIDs pointed to by |curves|
* into a newly allocated array of TLS curve IDs. On success, the function
* returns one and writes the array to |*out_curve_ids| and its size to
* |*out_curve_ids_len|. Otherwise, it returns zero. */
int tls1_set_curves(uint16_t **out_curve_ids, size_t *out_curve_ids_len,
const int *curves, size_t ncurves);
/* tls1_check_ec_cert returns one if |x| is an ECC certificate with curve and
* point format compatible with the client's preferences. Otherwise it returns
* zero. */
int tls1_check_ec_cert(SSL *s, X509 *x);
/* tls1_check_ec_tmp_key returns one if the EC temporary key is compatible with
* client extensions and zero otherwise. */
int tls1_check_ec_tmp_key(SSL *s);
int tls1_shared_list(SSL *s, const uint8_t *l1, size_t l1len, const uint8_t *l2,
size_t l2len, int nmatch);
uint8_t *ssl_add_clienthello_tlsext(SSL *s, uint8_t *buf, uint8_t *limit,
size_t header_len);
uint8_t *ssl_add_serverhello_tlsext(SSL *s, uint8_t *buf, uint8_t *limit);
int ssl_parse_clienthello_tlsext(SSL *s, CBS *cbs);
int ssl_parse_serverhello_tlsext(SSL *s, CBS *cbs);
int ssl_prepare_clienthello_tlsext(SSL *s);
int ssl_prepare_serverhello_tlsext(SSL *s);
#define tlsext_tick_md EVP_sha256
int tls1_process_ticket(SSL *s, const struct ssl_early_callback_ctx *ctx,
SSL_SESSION **ret);
int tls12_get_sigandhash(uint8_t *p, const EVP_PKEY *pk, const EVP_MD *md);
int tls12_get_sigid(const EVP_PKEY *pk);
const EVP_MD *tls12_get_hash(uint8_t hash_alg);
int tls1_channel_id_hash(EVP_MD_CTX *ctx, SSL *s);
int tls1_record_handshake_hashes_for_channel_id(SSL *s);
int tls1_set_sigalgs_list(CERT *c, const char *str, int client);
int tls1_set_sigalgs(CERT *c, const int *salg, size_t salglen, int client);
/* ssl_ctx_log_rsa_client_key_exchange logs |premaster| to |ctx|, if logging is
* enabled. It returns one on success and zero on failure. The entry is
* identified by the first 8 bytes of |encrypted_premaster|. */
int ssl_ctx_log_rsa_client_key_exchange(SSL_CTX *ctx,
const uint8_t *encrypted_premaster,
size_t encrypted_premaster_len,
const uint8_t *premaster,
size_t premaster_len);
/* ssl_ctx_log_master_secret logs |master| to |ctx|, if logging is enabled. It
* returns one on success and zero on failure. The entry is identified by
* |client_random|. */
int ssl_ctx_log_master_secret(SSL_CTX *ctx, const uint8_t *client_random,
size_t client_random_len, const uint8_t *master,
size_t master_len);
/* ssl3_can_false_start returns one if |s| is allowed to False Start and zero
* otherwise. */
int ssl3_can_false_start(const SSL *s);
/* ssl3_get_enc_method returns the SSL3_ENC_METHOD corresponding to
* |version|. */
const SSL3_ENC_METHOD *ssl3_get_enc_method(uint16_t version);
/* ssl3_get_max_server_version returns the maximum SSL/TLS version number
* supported by |s| as a server, or zero if all versions are disabled. */
uint16_t ssl3_get_max_server_version(const SSL *s);
/* ssl3_get_mutual_version selects the protocol version on |s| for a client
* which advertises |client_version|. If no suitable version exists, it returns
* zero. */
uint16_t ssl3_get_mutual_version(SSL *s, uint16_t client_version);
/* ssl3_get_max_client_version returns the maximum protocol version configured
* for the client. It is guaranteed that the set of allowed versions at or below
* this maximum version is contiguous. If all versions are disabled, it returns
* zero. */
uint16_t ssl3_get_max_client_version(SSL *s);
/* ssl3_is_version_enabled returns one if |version| is an enabled protocol
* version for |s| and zero otherwise. */
int ssl3_is_version_enabled(SSL *s, uint16_t version);
/* ssl3_version_from_wire maps |wire_version| to a protocol version. For
* SSLv3/TLS, the version is returned as-is. For DTLS, the corresponding TLS
* version is used. Note that this mapping is not injective but preserves
* comparisons.
*
* TODO(davidben): To normalize some DTLS-specific code, move away from using
* the wire version except at API boundaries. */
uint16_t ssl3_version_from_wire(SSL *s, uint16_t wire_version);
int ssl_add_serverhello_renegotiate_ext(SSL *s, uint8_t *p, int *len,
int maxlen);
int ssl_parse_serverhello_renegotiate_ext(SSL *s, CBS *cbs, int *out_alert);
int ssl_add_clienthello_renegotiate_ext(SSL *s, uint8_t *p, int *len,
int maxlen);
int ssl_parse_clienthello_renegotiate_ext(SSL *s, CBS *cbs, int *out_alert);
long ssl_get_algorithm2(SSL *s);
int tls1_process_sigalgs(SSL *s, const CBS *sigalgs);
/* tls1_choose_signing_digest returns a digest for use with |pkey| based on the
* peer's preferences recorded for |s| and the digests supported by |pkey|. */
const EVP_MD *tls1_choose_signing_digest(SSL *s, EVP_PKEY *pkey);
size_t tls12_get_psigalgs(SSL *s, const uint8_t **psigs);
int tls12_check_peer_sigalg(const EVP_MD **out_md, int *out_alert, SSL *s,
CBS *cbs, EVP_PKEY *pkey);
void ssl_set_client_disabled(SSL *s);
int ssl_add_clienthello_use_srtp_ext(SSL *s, uint8_t *p, int *len, int maxlen);
int ssl_parse_clienthello_use_srtp_ext(SSL *s, CBS *cbs, int *out_alert);
int ssl_add_serverhello_use_srtp_ext(SSL *s, uint8_t *p, int *len, int maxlen);
int ssl_parse_serverhello_use_srtp_ext(SSL *s, CBS *cbs, int *out_alert);
#endif