openssl/ssl/s3_lib.c

/* ssl/s3_lib.c */
/* Copyright (C) 1995-1997 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.]
 */

#include <stdio.h>
#include "objects.h"
#include "ssl_locl.h"

char *ssl3_version_str="SSLv3 part of SSLeay 0.8.1b 29-Jun-1998";

#define SSL3_NUM_CIPHERS	(sizeof(ssl3_ciphers)/sizeof(SSL_CIPHER))

#ifndef NOPROTO
static long ssl3_default_timeout(void );
#else
static long ssl3_default_timeout();
#endif

SSL_CIPHER ssl3_ciphers[]={
/* The RSA ciphers */
/* Cipher 01 */
	{
	1,
	SSL3_TXT_RSA_NULL_MD5,
	SSL3_CK_RSA_NULL_MD5,
	SSL_kRSA|SSL_aRSA|SSL_eNULL |SSL_MD5|SSL_NOT_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 02 */
	{
	1,
	SSL3_TXT_RSA_NULL_SHA,
	SSL3_CK_RSA_NULL_SHA,
	SSL_kRSA|SSL_aRSA|SSL_eNULL |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},

/* anon DH */
/* Cipher 17 */
	{
	1,
	SSL3_TXT_ADH_RC4_40_MD5,
	SSL3_CK_ADH_RC4_40_MD5,
	SSL_kEDH |SSL_aNULL|SSL_RC4  |SSL_MD5 |SSL_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 18 */
	{
	1,
	SSL3_TXT_ADH_RC4_128_MD5,
	SSL3_CK_ADH_RC4_128_MD5,
	SSL_kEDH |SSL_aNULL|SSL_RC4  |SSL_MD5|SSL_NOT_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 19 */
	{
	1,
	SSL3_TXT_ADH_DES_40_CBC_SHA,
	SSL3_CK_ADH_DES_40_CBC_SHA,
	SSL_kEDH |SSL_aNULL|SSL_DES|SSL_SHA1|SSL_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 1A */
	{
	1,
	SSL3_TXT_ADH_DES_64_CBC_SHA,
	SSL3_CK_ADH_DES_64_CBC_SHA,
	SSL_kEDH |SSL_aNULL|SSL_DES  |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 1B */
	{
	1,
	SSL3_TXT_ADH_DES_196_CBC_SHA,
	SSL3_CK_ADH_DES_196_CBC_SHA,
	SSL_kEDH |SSL_aNULL|SSL_3DES |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},

/* RSA again */
/* Cipher 03 */
	{
	1,
	SSL3_TXT_RSA_RC4_40_MD5,
	SSL3_CK_RSA_RC4_40_MD5,
	SSL_kRSA|SSL_aRSA|SSL_RC4  |SSL_MD5 |SSL_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 04 */
	{
	1,
	SSL3_TXT_RSA_RC4_128_MD5,
	SSL3_CK_RSA_RC4_128_MD5,
	SSL_kRSA|SSL_aRSA|SSL_RC4  |SSL_MD5|SSL_NOT_EXP|SSL_SSLV3|SSL_MEDIUM,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 05 */
	{
	1,
	SSL3_TXT_RSA_RC4_128_SHA,
	SSL3_CK_RSA_RC4_128_SHA,
	SSL_kRSA|SSL_aRSA|SSL_RC4  |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_MEDIUM,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 06 */
	{
	1,
	SSL3_TXT_RSA_RC2_40_MD5,
	SSL3_CK_RSA_RC2_40_MD5,
	SSL_kRSA|SSL_aRSA|SSL_RC2  |SSL_MD5 |SSL_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 07 */
	{
	1,
	SSL3_TXT_RSA_IDEA_128_SHA,
	SSL3_CK_RSA_IDEA_128_SHA,
	SSL_kRSA|SSL_aRSA|SSL_IDEA |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_MEDIUM,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 08 */
	{
	1,
	SSL3_TXT_RSA_DES_40_CBC_SHA,
	SSL3_CK_RSA_DES_40_CBC_SHA,
	SSL_kRSA|SSL_aRSA|SSL_DES|SSL_SHA1|SSL_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 09 */
	{
	1,
	SSL3_TXT_RSA_DES_64_CBC_SHA,
	SSL3_CK_RSA_DES_64_CBC_SHA,
	SSL_kRSA|SSL_aRSA|SSL_DES  |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_LOW,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 0A */
	{
	1,
	SSL3_TXT_RSA_DES_192_CBC3_SHA,
	SSL3_CK_RSA_DES_192_CBC3_SHA,
	SSL_kRSA|SSL_aRSA|SSL_3DES |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_HIGH,
	0,
	SSL_ALL_CIPHERS,
	},

/*  The DH ciphers */
/* Cipher 0B */
	{
	0,
	SSL3_TXT_DH_DSS_DES_40_CBC_SHA,
	SSL3_CK_DH_DSS_DES_40_CBC_SHA,
	SSL_kDHd |SSL_aDH|SSL_DES|SSL_SHA1|SSL_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 0C */
	{
	0,
	SSL3_TXT_DH_DSS_DES_64_CBC_SHA,
	SSL3_CK_DH_DSS_DES_64_CBC_SHA,
	SSL_kDHd |SSL_aDH|SSL_DES  |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_LOW,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 0D */
	{
	0,
	SSL3_TXT_DH_DSS_DES_192_CBC3_SHA,
	SSL3_CK_DH_DSS_DES_192_CBC3_SHA,
	SSL_kDHd |SSL_aDH|SSL_3DES |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_HIGH,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 0E */
	{
	0,
	SSL3_TXT_DH_RSA_DES_40_CBC_SHA,
	SSL3_CK_DH_RSA_DES_40_CBC_SHA,
	SSL_kDHr |SSL_aDH|SSL_DES|SSL_SHA1|SSL_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 0F */
	{
	0,
	SSL3_TXT_DH_RSA_DES_64_CBC_SHA,
	SSL3_CK_DH_RSA_DES_64_CBC_SHA,
	SSL_kDHr |SSL_aDH|SSL_DES  |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_LOW,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 10 */
	{
	0,
	SSL3_TXT_DH_RSA_DES_192_CBC3_SHA,
	SSL3_CK_DH_RSA_DES_192_CBC3_SHA,
	SSL_kDHr |SSL_aDH|SSL_3DES |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_HIGH,
	0,
	SSL_ALL_CIPHERS,
	},

/* The Ephemeral DH ciphers */
/* Cipher 11 */
	{
	1,
	SSL3_TXT_EDH_DSS_DES_40_CBC_SHA,
	SSL3_CK_EDH_DSS_DES_40_CBC_SHA,
	SSL_kEDH|SSL_aDSS|SSL_DES|SSL_SHA1|SSL_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 12 */
	{
	1,
	SSL3_TXT_EDH_DSS_DES_64_CBC_SHA,
	SSL3_CK_EDH_DSS_DES_64_CBC_SHA,
	SSL_kEDH|SSL_aDSS|SSL_DES  |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_LOW,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 13 */
	{
	1,
	SSL3_TXT_EDH_DSS_DES_192_CBC3_SHA,
	SSL3_CK_EDH_DSS_DES_192_CBC3_SHA,
	SSL_kEDH|SSL_aDSS|SSL_3DES |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_HIGH,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 14 */
	{
	1,
	SSL3_TXT_EDH_RSA_DES_40_CBC_SHA,
	SSL3_CK_EDH_RSA_DES_40_CBC_SHA,
	SSL_kEDH|SSL_aRSA|SSL_DES|SSL_SHA1|SSL_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 15 */
	{
	1,
	SSL3_TXT_EDH_RSA_DES_64_CBC_SHA,
	SSL3_CK_EDH_RSA_DES_64_CBC_SHA,
	SSL_kEDH|SSL_aRSA|SSL_DES  |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_LOW,
	0,
	SSL_ALL_CIPHERS,
	},
/* Cipher 16 */
	{
	1,
	SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA,
	SSL3_CK_EDH_RSA_DES_192_CBC3_SHA,
	SSL_kEDH|SSL_aRSA|SSL_3DES |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3|SSL_HIGH,
	0,
	SSL_ALL_CIPHERS,
	},

/* Fortezza */
/* Cipher 1C */
	{
	0,
	SSL3_TXT_FZA_DMS_NULL_SHA,
	SSL3_CK_FZA_DMS_NULL_SHA,
	SSL_kFZA|SSL_aFZA |SSL_eNULL |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},

/* Cipher 1D */
	{
	0,
	SSL3_TXT_FZA_DMS_FZA_SHA,
	SSL3_CK_FZA_DMS_FZA_SHA,
	SSL_kFZA|SSL_aFZA |SSL_eFZA |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},

/* Cipher 1E */
	{
	0,
	SSL3_TXT_FZA_DMS_RC4_SHA,
	SSL3_CK_FZA_DMS_RC4_SHA,
	SSL_kFZA|SSL_aFZA |SSL_RC4  |SSL_SHA1|SSL_NOT_EXP|SSL_SSLV3,
	0,
	SSL_ALL_CIPHERS,
	},

/* end of list */
	};

static SSL_METHOD SSLv3_data= {
	3,
	ssl3_new,
	ssl3_clear,
	ssl3_free,
	ssl_undefined_function,
	ssl_undefined_function,
	ssl3_read,
	ssl3_peek,
	ssl3_write,
	ssl3_shutdown,
	ssl3_renegotiate,
	ssl3_ctrl,
	ssl3_ctx_ctrl,
	ssl3_get_cipher_by_char,
	ssl3_put_cipher_by_char,
	ssl3_pending,
	ssl3_num_ciphers,
	ssl3_get_cipher,
	ssl_bad_method,
	ssl3_default_timeout,
	};

static long ssl3_default_timeout()
	{
	/* 2 hours, the 24 hours mentioned in the SSLv3 spec
	 * is way too long for http, the cache would over fill */
	return(60*60*2);
	}

SSL_METHOD *sslv3_base_method()
	{
	return(&SSLv3_data);
	}

int ssl3_num_ciphers()
	{
	return(SSL3_NUM_CIPHERS);
	}

SSL_CIPHER *ssl3_get_cipher(u)
unsigned int u;
	{
	if (u < SSL3_NUM_CIPHERS)
		return(&(ssl3_ciphers[SSL3_NUM_CIPHERS-1-u]));
	else
		return(NULL);
	}

/* The problem is that it may not be the correct record type */
int ssl3_pending(s)
SSL *s;
	{
	return(s->s3->rrec.length);
	}

int ssl3_new(s)
SSL *s;
	{
	SSL3_CTX *s3;

	if ((s3=(SSL3_CTX *)Malloc(sizeof(SSL3_CTX))) == NULL) goto err;

	s->s3=s3;
	s->s3->tmp.ca_names=NULL;
	s->s3->tmp.key_block=NULL;
	s->s3->rbuf.buf=NULL;
	s->s3->wbuf.buf=NULL;

	ssl3_clear(s);
	return(1);
err:
	return(0);
	}

void ssl3_free(s)
SSL *s;
	{
	ssl3_cleanup_key_block(s);
	if (s->s3->rbuf.buf != NULL)
		Free(s->s3->rbuf.buf);
	if (s->s3->wbuf.buf != NULL)
		Free(s->s3->wbuf.buf);
#ifndef NO_DH
	if (s->s3->tmp.dh != NULL)
		DH_free(s->s3->tmp.dh);
#endif
	if (s->s3->tmp.ca_names != NULL)
		sk_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
	memset(s->s3,0,sizeof(SSL3_CTX));
	Free(s->s3);
	s->s3=NULL;
	}

void ssl3_clear(s)
SSL *s;
	{
	unsigned char *rp,*wp;

	ssl3_cleanup_key_block(s);
	if (s->s3->tmp.ca_names != NULL)
		sk_pop_free(s->s3->tmp.ca_names,X509_NAME_free);

	rp=s->s3->rbuf.buf;
	wp=s->s3->wbuf.buf;

	memset(s->s3,0,sizeof(SSL3_CTX));
	if (rp != NULL)
		{
		s->packet= &(s->s3->rbuf.buf[0]);
		s->s3->rbuf.buf=rp;
		s->s3->wbuf.buf=wp;
		}
	else
		s->packet=NULL;
	s->packet_length=0;
	s->version=3;
	}

long ssl3_ctrl(s,cmd,larg,parg)
SSL *s;
int cmd;
long larg;
char *parg;
	{
	return(0);
	}

long ssl3_ctx_ctrl(ctx,cmd,larg,parg)
SSL_CTX *ctx;
int cmd;
long larg;
char *parg;
	{
	CERT *cert;

	cert=ctx->default_cert;

	switch (cmd)
		{
#ifndef NO_RSA
	case SSL_CTRL_NEED_TMP_RSA:
		if (	(cert->rsa_tmp == NULL) &&
			((cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL) ||
			 (EVP_PKEY_size(cert->pkeys[SSL_PKEY_RSA_ENC].privatekey) > (512/8)))
			)
			return(1);
		else
			return(0);
		break;
	case SSL_CTRL_SET_TMP_RSA:
		{
		RSA *rsa;
		int i;

		rsa=(RSA *)parg;
		i=1;
		if (rsa == NULL)
			i=0;
		else
			{
			if ((rsa=RSAPrivateKey_dup(rsa)) == NULL)
				i=0;
			}
		if (!i)
			{
			SSLerr(SSL_F_SSL3_CTX_CTRL,ERR_R_RSA_LIB);
			return(0);
			}
		else
			{
			if (cert->rsa_tmp != NULL)
				RSA_free(cert->rsa_tmp);
			cert->rsa_tmp=rsa;
			return(1);
			}
		}
		break;
	case SSL_CTRL_SET_TMP_RSA_CB:
		cert->rsa_tmp_cb=(RSA *(*)())parg;
		break;
#endif
#ifndef NO_DH
	case SSL_CTRL_SET_TMP_DH:
		{
		DH *new=NULL,*dh;

		dh=(DH *)parg;
		if (	((new=DHparams_dup(dh)) == NULL) ||
			(!DH_generate_key(new)))
			{
			SSLerr(SSL_F_SSL3_CTX_CTRL,ERR_R_DH_LIB);
			if (new != NULL) DH_free(new);
			return(0);
			}
		else
			{
			if (cert->dh_tmp != NULL)
				DH_free(cert->dh_tmp);
			cert->dh_tmp=new;
			return(1);
			}
		}
		break;
	case SSL_CTRL_SET_TMP_DH_CB:
		cert->dh_tmp_cb=(DH *(*)())parg;
		break;
#endif
	default:
		return(0);
		}
	return(1);
	}

/* This function needs to check if the ciphers required are actually
 * available */
SSL_CIPHER *ssl3_get_cipher_by_char(p)
unsigned char *p;
	{
	static int init=1;
	static SSL_CIPHER *sorted[SSL3_NUM_CIPHERS];
	SSL_CIPHER c,*cp= &c,**cpp;
	unsigned long id;
	int i;

	if (init)
		{
		init=0;

		for (i=0; i<SSL3_NUM_CIPHERS; i++)
			sorted[i]= &(ssl3_ciphers[i]);

		qsort(	(char *)sorted,
			SSL3_NUM_CIPHERS,sizeof(SSL_CIPHER *),
			FP_ICC ssl_cipher_ptr_id_cmp);
		}

	id=0x03000000L|((unsigned long)p[0]<<8L)|(unsigned long)p[1];
	c.id=id;
	cpp=(SSL_CIPHER **)OBJ_bsearch((char *)&cp,
		(char *)sorted,
		SSL3_NUM_CIPHERS,sizeof(SSL_CIPHER *),
		(int (*)())ssl_cipher_ptr_id_cmp);
	if ((cpp == NULL) || !(*cpp)->valid)
		return(NULL);
	else
		return(*cpp);
	}

int ssl3_put_cipher_by_char(c,p)
SSL_CIPHER *c;
unsigned char *p;
	{
	long l;

	if (p != NULL)
		{
		l=c->id;
		if ((l & 0xff000000) != 0x03000000) return(0);
		p[0]=((unsigned char)(l>> 8L))&0xFF;
		p[1]=((unsigned char)(l     ))&0xFF;
		}
	return(2);
	}

void ssl3_generate_key_block(s,km,num)
SSL *s;
unsigned char *km;
int num;
	{
	MD5_CTX m5;
	SHA_CTX s1;
	unsigned char buf[8],smd[SHA_DIGEST_LENGTH];
	unsigned char c='A';
	int i,j,k;

	k=0;
	for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
		{
		k++;
		for (j=0; j<k; j++)
			buf[j]=c;
		c++;
		SHA1_Init(  &s1);
		SHA1_Update(&s1,buf,k);
		SHA1_Update(&s1,s->session->master_key,
			s->session->master_key_length);
		SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
		SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
		SHA1_Final( smd,&s1);

		MD5_Init(  &m5);
		MD5_Update(&m5,s->session->master_key,
			s->session->master_key_length);
		MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
		if ((i+MD5_DIGEST_LENGTH) > num)
			{
			MD5_Final(smd,&m5);
			memcpy(km,smd,(num-i));
			}
		else
			MD5_Final(km,&m5);

		km+=MD5_DIGEST_LENGTH;
		}
	memset(smd,0,SHA_DIGEST_LENGTH);
	}

int ssl3_part_read(s,i)
SSL *s;
int i;
	{
	s->rwstate=SSL_READING;

	if (i < 0)
		{
		return(i);
		}
	else
		{
		s->init_num+=i;
		return(0);
		}
	}

SSL_CIPHER *ssl3_choose_cipher(s,have,pref)
SSL *s;
STACK *have,*pref;
	{
	SSL_CIPHER *c,*ret=NULL;
	int i,j,ok;
	CERT *cert;
	unsigned long alg,mask,emask;

	/* Lets see which ciphers we can supported */
	if (s->cert != NULL)
		cert=s->cert;
	else
		cert=s->ctx->default_cert;

	ssl_set_cert_masks(cert);
	mask=cert->mask;
	emask=cert->export_mask;
			
	sk_set_cmp_func(pref,ssl_cipher_ptr_id_cmp);

	for (i=0; i<sk_num(have); i++)
		{
		c=(SSL_CIPHER *)sk_value(have,i);
		alg=c->algorithms&(SSL_MKEY_MASK|SSL_AUTH_MASK);
		if (alg & SSL_EXPORT)
			{
			ok=((alg & emask) == alg)?1:0;
#ifdef CIPHER_DEBUG
			printf("%d:[%08lX:%08lX]%s\n",ok,alg,mask,c->name);
#endif
			}
		else
			{
			ok=((alg & mask) == alg)?1:0;
#ifdef CIPHER_DEBUG
			printf("%d:[%08lX:%08lX]%s\n",ok,alg,mask,c->name);
#endif
			}

		if (!ok) continue;
	
		j=sk_find(pref,(char *)c);
		if (j >= 0)
			{
			ret=(SSL_CIPHER *)sk_value(pref,j);
			break;
			}
		}
	return(ret);
	}

int ssl3_get_req_cert_type(s,p)
SSL *s;
unsigned char *p;
	{
	int ret=0;
	unsigned long alg;

	alg=s->s3->tmp.new_cipher->algorithms;

#ifndef NO_DH
	if (alg & (SSL_kDHr|SSL_kEDH))
		{
#ifndef NO_RSA
		p[ret++]=SSL3_CT_RSA_FIXED_DH;
#endif
#ifndef NO_DSA
		p[ret++]=SSL3_CT_DSS_FIXED_DH;
#endif
		}
	if (alg & (SSL_kEDH|SSL_kDHd|SSL_kDHr))
		{
#ifndef NO_RSA
		p[ret++]=SSL3_CT_RSA_EPHEMERAL_DH;
#endif
#ifndef NO_DSA
		p[ret++]=SSL3_CT_DSS_EPHEMERAL_DH;
#endif
		}
#endif /* !NO_DH */
#ifndef NO_RSA
	p[ret++]=SSL3_CT_RSA_SIGN;
#endif
/*	p[ret++]=SSL3_CT_DSS_SIGN; */
	return(ret);
	}

int ssl3_shutdown(s)
SSL *s;
	{

	/* Don't do anything much if we have not done the handshake or
	 * we don't want to send messages :-) */
	if ((s->quiet_shutdown) || (s->state == SSL_ST_BEFORE))
		{
		s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
		return(1);
		}

	if (!(s->shutdown & SSL_SENT_SHUTDOWN))
		{
		s->shutdown|=SSL_SENT_SHUTDOWN;
#if 1
		ssl3_send_alert(s,SSL3_AL_WARNING,SSL3_AD_CLOSE_NOTIFY);
#endif
		/* our shutdown alert has been sent now, and if it still needs
	 	 * to be written, s->s3->alert_dispatch will be true */
		}
	else if (s->s3->alert_dispatch)
		{
		/* resend it if not sent */
#if 1
		ssl3_dispatch_alert(s);
#endif
		}
	else if (!(s->shutdown & SSL_RECEIVED_SHUTDOWN))
		{
		/* If we are waiting for a close from our peer, we are closed */
		ssl3_read_bytes(s,0,NULL,0);
		}

	if ((s->shutdown == (SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN)) &&
		!s->s3->alert_dispatch)
		return(1);
	else
		return(0);
	}

int ssl3_write(s,buf,len)
SSL *s;
const char *buf;
int len;
	{
	int ret,n;
	BIO *under;

#if 0
	if (s->shutdown & SSL_SEND_SHUTDOWN)
		{
		s->rwstate=SSL_NOTHING;
		return(0);
		}
#endif
	errno=0;

	/* This is an experimental flag that sends the
	 * last handshake message in the same packet as the first
	 * use data - used to see if it helps the TCP protocol during
	 * session-id reuse */
	/* The second test is because the buffer may have been removed */
	if ((s->s3->flags & SSL3_FLAGS_POP_BUFFER) && (s->wbio == s->bbio))
		{
		/* First time through, we write into the buffer */
		if (s->s3->delay_buf_pop_ret == 0)
			{
			ret=ssl3_write_bytes(s,SSL3_RT_APPLICATION_DATA,
				(char *)buf,len);
			if (ret <= 0) return(ret);

			s->s3->delay_buf_pop_ret=ret;
			}

		s->rwstate=SSL_WRITING;
		n=BIO_flush(s->wbio);
		if (n <= 0) return(n);
		s->rwstate=SSL_NOTHING;

		/* We have flushed the buffer */
		under=BIO_pop(s->wbio);
		s->wbio=under;
		BIO_free(s->bbio);
		s->bbio=NULL;
		ret=s->s3->delay_buf_pop_ret;
		s->s3->delay_buf_pop_ret=0;

		s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
		}
	else
		{
		ret=ssl3_write_bytes(s,SSL3_RT_APPLICATION_DATA,
			(char *)buf,len);
		if (ret <= 0) return(ret);
		}
	return(ret);
	}

int ssl3_read(s,buf,len)
SSL *s;
char *buf;
int len;
	{
	errno=0;
	return(ssl3_read_bytes(s,SSL3_RT_APPLICATION_DATA,buf,len));
	}

int ssl3_peek(s,buf,len)
SSL *s;
char *buf;
int len;
	{
	SSL3_RECORD *rr;
	int n;

	rr= &(s->s3->rrec);
	if ((rr->length == 0) || (rr->type != SSL3_RT_APPLICATION_DATA))
		return(0);

	if ((unsigned int)len > rr->length)
		n=rr->length;
	else
		n=len;
	memcpy(buf,&(rr->data[rr->off]),(unsigned int)n);
	return(n);
	}

int ssl3_renegotiate(s)
SSL *s;
	{
	if (s->handshake_func == NULL)
		return(1);

	if (s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)
		return(0);

	if (!SSL_in_init(s))
		s->state=SSL_ST_RENEGOTIATE;
	return(1);
	}