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Diffstat (limited to 'src/ssl/ssl_locl.h')
| -rw-r--r-- | src/ssl/ssl_locl.h | 1035 |
1 files changed, 1035 insertions, 0 deletions
diff --git a/src/ssl/ssl_locl.h b/src/ssl/ssl_locl.h new file mode 100644 index 0000000..a0c323c --- /dev/null +++ b/src/ssl/ssl_locl.h @@ -0,0 +1,1035 @@ +/* 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_kEDH 0x00000002L /* tmp DH key no DH cert */ +#define SSL_kEECDH 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->enc_method->enc_flags & SSL_ENC_FLAG_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_kEDH <- RSA_ENC | RSA_SIGN | DSA_SIGN + * SSL_aRSA <- RSA_ENC | RSA_SIGN + * SSL_aDSS <- DSA_SIGN */ + +#define PENDING_SESSION -10000 +#define CERTIFICATE_SELECTION_PENDING -10001 + +/* 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 + +/* Values for the |hash_message| parameter of |s->method->ssl_get_message|. */ +#define SSL_GET_MESSAGE_DONT_HASH_MESSAGE 0 +#define SSL_GET_MESSAGE_HASH_MESSAGE 1 + +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 { + 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, int 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); + int (*ssl_version)(void); + 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)); +}; + +/* 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 finish_mac_length; + 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; + /* Handshake header length */ + unsigned int hhlen; + /* Set the handshake header */ + void (*set_handshake_header)(SSL *s, int type, unsigned long len); + /* Write out handshake message */ + int (*do_write)(SSL *s); +}; + +#define SSL_HM_HEADER_LENGTH(s) s->enc_method->hhlen +#define ssl_handshake_start(s) \ + (((uint8_t *)s->init_buf->data) + s->enc_method->hhlen) +#define ssl_set_handshake_header(s, htype, len) \ + s->enc_method->set_handshake_header(s, htype, len) +#define ssl_do_write(s) s->enc_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 +/* Is DTLS */ +#define SSL_ENC_FLAG_DTLS 0x8 +/* 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 0x10 + +/* 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; +extern const SSL3_ENC_METHOD DTLSv1_enc_data; +extern const SSL3_ENC_METHOD DTLSv1_2_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); +int ssl_cert_inst(CERT **o); +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, int hash_message, int *ok); + +/* ssl3_hash_current_message incorporates the current handshake message into + * the handshake hash. */ +void 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); +void ssl3_finish_mac(SSL *s, const uint8_t *buf, int len); +void ssl3_free_digest_list(SSL *s); +unsigned long 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); + +void 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_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off, + int *found); +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_get_ccs_header(uint8_t *data, struct ccs_header_st *ccs_hdr); +void dtls1_reset_seq_numbers(SSL *s, int rw); +int dtls1_check_timeout_num(SSL *s); +int dtls1_handle_timeout(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, + int 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); + +int ssl3_can_cutthrough(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 |