[thirdparty/openssl.git] / ssl / s3_enc.c

/* ssl/s3_enc.c */
/* 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.]
 */

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

static unsigned char ssl3_pad_1[48]={
	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };

static unsigned char ssl3_pad_2[48]={
	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };

#ifndef NO_PROTO
static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
	unsigned char *sender, int len, unsigned char *p);
#else
static int ssl3_handshake_mac();
#endif

static 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_change_cipher_state(s,which)
SSL *s;
int which;
	{
	unsigned char *p,*key_block,*mac_secret;
	unsigned char exp_key[EVP_MAX_KEY_LENGTH];
	unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
	unsigned char *ms,*key,*iv,*er1,*er2;
	EVP_CIPHER_CTX *dd;
	EVP_CIPHER *c;
	SSL_COMPRESSION *comp;
	EVP_MD *m;
	MD5_CTX md;
	int exp,n,i,j,k;

	exp=(s->s3->tmp.new_cipher->algorithms & SSL_EXPORT)?1:0;
	c=s->s3->tmp.new_sym_enc;
	m=s->s3->tmp.new_hash;
	comp=s->s3->tmp.new_compression;
	key_block=s->s3->tmp.key_block;

	if (which & SSL3_CC_READ)
		{
		if ((s->enc_read_ctx == NULL) &&
			((s->enc_read_ctx=(EVP_CIPHER_CTX *)
			Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
			goto err;
		dd= s->enc_read_ctx;
		s->read_hash=m;
		s->read_compression=comp;
		memset(&(s->s3->read_sequence[0]),0,8);
		mac_secret= &(s->s3->read_mac_secret[0]);
		}
	else
		{
		if ((s->enc_write_ctx == NULL) &&
			((s->enc_write_ctx=(EVP_CIPHER_CTX *)
			Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
			goto err;
		dd= s->enc_write_ctx;
		s->write_hash=m;
		s->write_compression=comp;
		memset(&(s->s3->write_sequence[0]),0,8);
		mac_secret= &(s->s3->write_mac_secret[0]);
		}

	EVP_CIPHER_CTX_init(dd);

	p=s->s3->tmp.key_block;
	i=EVP_MD_size(m);
	j=(exp)?5:EVP_CIPHER_key_length(c);
	k=EVP_CIPHER_iv_length(c);
	if (	(which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
		(which == SSL3_CHANGE_CIPHER_SERVER_READ))
		{
		ms=  &(p[ 0]); n=i+i;
		key= &(p[ n]); n+=j+j;
		iv=  &(p[ n]); n+=k+k;
		er1= &(s->s3->client_random[0]);
		er2= &(s->s3->server_random[0]);
		}
	else
		{
		n=i;
		ms=  &(p[ n]); n+=i+j;
		key= &(p[ n]); n+=j+k;
		iv=  &(p[ n]); n+=k;
		er1= &(s->s3->server_random[0]);
		er2= &(s->s3->client_random[0]);
		}

	if (n > s->s3->tmp.key_block_length)
		{
		SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
		goto err2;
		}

	memcpy(mac_secret,ms,i);
	if (exp)
		{
		/* In here I set both the read and write key/iv to the
		 * same value since only the correct one will be used :-).
		 */
		MD5_Init(&md);
		MD5_Update(&md,key,j);
		MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
		MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
		MD5_Final(&(exp_key[0]),&md);
		key= &(exp_key[0]);

		if (k > 0)
			{
			MD5_Init(&md);
			MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
			MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
			MD5_Final(&(exp_iv[0]),&md);
			iv= &(exp_iv[0]);
			}
		}

	s->session->key_arg_length=0;

	EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));

	memset(&(exp_key[0]),0,sizeof(exp_key));
	memset(&(exp_iv[0]),0,sizeof(exp_iv));
	return(1);
err:
	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
err2:
	return(0);
	}

int ssl3_setup_key_block(s)
SSL *s;
	{
	unsigned char *p;
	EVP_CIPHER *c;
	EVP_MD *hash;
	int num,exp;

	if (s->s3->tmp.key_block_length != 0)
		return(1);

	if (!ssl_cipher_get_evp(s->session->cipher,&c,&hash))
		{
		SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
		return(0);
		}

	s->s3->tmp.new_sym_enc=c;
	s->s3->tmp.new_hash=hash;

	exp=(s->session->cipher->algorithms & SSL_EXPORT)?1:0;

	num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
	num*=2;

	ssl3_cleanup_key_block(s);

	if ((p=(unsigned char *)Malloc(num)) == NULL)
		goto err;

	s->s3->tmp.key_block_length=num;
	s->s3->tmp.key_block=p;

	ssl3_generate_key_block(s,p,num);

	return(1);
err:
	SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
	return(0);
	}

void ssl3_cleanup_key_block(s)
SSL *s;
	{
	if (s->s3->tmp.key_block != NULL)
		{
		memset(s->s3->tmp.key_block,0,
			s->s3->tmp.key_block_length);
		Free(s->s3->tmp.key_block);
		s->s3->tmp.key_block=NULL;
		}
	s->s3->tmp.key_block_length=0;
	}

int ssl3_enc(s,send)
SSL *s;
int send;
	{
	SSL3_RECORD *rec;
	EVP_CIPHER_CTX *ds;
	unsigned long l;
	int bs,i;
	EVP_CIPHER *enc;
	SSL_COMPRESSION *comp;

	if (send)
		{
		ds=s->enc_write_ctx;
		rec= &(s->s3->wrec);
		if (s->enc_write_ctx == NULL)
			{ enc=NULL; comp=NULL; }
		else
			{
			enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
			comp=s->write_compression;
			}
		}
	else
		{
		ds=s->enc_read_ctx;
		rec= &(s->s3->rrec);
		if (s->enc_read_ctx == NULL)
			{ enc=NULL; comp=NULL; }
		else
			{
			enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
			comp=s->read_compression;
			}
		}

	if ((s->session == NULL) || (ds == NULL) ||
		((enc == NULL) && (comp == NULL)))
		{
		memcpy(rec->data,rec->input,rec->length);
		rec->input=rec->data;
		}
	else
		{
		l=rec->length;
		bs=EVP_CIPHER_block_size(ds->cipher);

		/* This should be using (bs-1) and bs instead of 7 and 8 */
		if ((bs != 1) && send)
			{
			i=bs-((int)l%bs);

			/* we need to add 'i-1' padding bytes */
			l+=i;
			rec->length+=i;
			rec->input[l-1]=(i-1);
			}

		EVP_Cipher(ds,rec->data,rec->input,l);

		if ((bs != 1) && !send)
			{
			i=rec->data[l-1]+1;
			if (i > bs)
				{
				SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
				ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
				return(0);
				}
			rec->length-=i;
			}
		}
	return(1);
	}

void ssl3_init_finished_mac(s)
SSL *s;
	{
	EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
	EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
	}

void ssl3_finish_mac(s,buf,len)
SSL *s;
unsigned char *buf;
int len;
	{
	EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
	EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
	}

int ssl3_cert_verify_mac(s,ctx,p)
SSL *s;
EVP_MD_CTX *ctx;
unsigned char *p;
	{
	return(ssl3_handshake_mac(s,ctx,NULL,0,p));
	}

int ssl3_final_finish_mac(s,ctx1,ctx2,sender,len,p)
SSL *s;
EVP_MD_CTX *ctx1,*ctx2;
unsigned char *sender;
int len;
unsigned char *p;
	{
	int ret;

	ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
	p+=ret;
	ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
	return(ret);
	}

static int ssl3_handshake_mac(s,in_ctx,sender,len,p)
SSL *s;
EVP_MD_CTX *in_ctx;
unsigned char *sender;
int len;
unsigned char *p;
	{
	unsigned int ret;
	int npad,n;
	unsigned int i;
	unsigned char md_buf[EVP_MAX_MD_SIZE];
	EVP_MD_CTX ctx;

	memcpy(&ctx,in_ctx,sizeof(EVP_MD_CTX));

	n=EVP_MD_CTX_size(&ctx);
	npad=(48/n)*n;

	if (sender != NULL)
		EVP_DigestUpdate(&ctx,sender,len);
	EVP_DigestUpdate(&ctx,s->session->master_key,
		s->session->master_key_length);
	EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
	EVP_DigestFinal(&ctx,md_buf,&i);

	EVP_DigestInit(&ctx,EVP_MD_CTX_type(&ctx));
	EVP_DigestUpdate(&ctx,s->session->master_key,
		s->session->master_key_length);
	EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
	EVP_DigestUpdate(&ctx,md_buf,i);
	EVP_DigestFinal(&ctx,p,&ret);

	memset(&ctx,0,sizeof(EVP_MD_CTX));

	return((int)ret);
	}

int ssl3_mac(ssl,md,send)
SSL *ssl;
unsigned char *md;
int send;
	{
	SSL3_RECORD *rec;
	unsigned char *mac_sec,*seq;
	EVP_MD_CTX md_ctx;
	EVP_MD *hash;
	unsigned char *p,rec_char;
	unsigned int md_size;
	int npad,i;

	if (send)
		{
		rec= &(ssl->s3->wrec);
		mac_sec= &(ssl->s3->write_mac_secret[0]);
		seq= &(ssl->s3->write_sequence[0]);
		hash=ssl->write_hash;
		}
	else
		{
		rec= &(ssl->s3->rrec);
		mac_sec= &(ssl->s3->read_mac_secret[0]);
		seq= &(ssl->s3->read_sequence[0]);
		hash=ssl->read_hash;
		}

	md_size=EVP_MD_size(hash);
	npad=(48/md_size)*md_size;

	/* Chop the digest off the end :-) */

	EVP_DigestInit(  &md_ctx,hash);
	EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
	EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
	EVP_DigestUpdate(&md_ctx,seq,8);
	rec_char=rec->type;
	EVP_DigestUpdate(&md_ctx,&rec_char,1);
	p=md;
	s2n(rec->length,p);
	EVP_DigestUpdate(&md_ctx,md,2);
	EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
	EVP_DigestFinal( &md_ctx,md,NULL);

	EVP_DigestInit(  &md_ctx,hash);
	EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
	EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
	EVP_DigestUpdate(&md_ctx,md,md_size);
	EVP_DigestFinal( &md_ctx,md,&md_size);

	for (i=7; i>=0; i--)
		if (++seq[i]) break; 

	return(md_size);
	}

int ssl3_generate_master_secret(s,out,p,len)
SSL *s;
unsigned char *out;
unsigned char *p;
int len;
	{
	static unsigned char *salt[3]={
		(unsigned char *)"A",
		(unsigned char *)"BB",
		(unsigned char *)"CCC",
		};
	unsigned char buf[EVP_MAX_MD_SIZE];
	EVP_MD_CTX ctx;
	int i,ret=0;
	unsigned int n;

	for (i=0; i<3; i++)
		{
		EVP_DigestInit(&ctx,s->ctx->sha1);
		EVP_DigestUpdate(&ctx,salt[i],strlen((char *)salt[i]));
		EVP_DigestUpdate(&ctx,p,len);
		EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
			SSL3_RANDOM_SIZE);
		EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
			SSL3_RANDOM_SIZE);
		EVP_DigestFinal(&ctx,buf,&n);

		EVP_DigestInit(&ctx,s->ctx->md5);
		EVP_DigestUpdate(&ctx,p,len);
		EVP_DigestUpdate(&ctx,buf,n);
		EVP_DigestFinal(&ctx,out,&n);
		out+=n;
		ret+=n;
		}
	return(ret);
	}

int ssl3_alert_code(code)
int code;
	{
	switch (code)
		{
	case SSL_AD_CLOSE_NOTIFY:	return(SSL3_AD_CLOSE_NOTIFY);
	case SSL_AD_UNEXPECTED_MESSAGE:	return(SSL3_AD_UNEXPECTED_MESSAGE);
	case SSL_AD_BAD_RECORD_MAC:	return(SSL3_AD_BAD_RECORD_MAC);
	case SSL_AD_DECRYPTION_FAILED:	return(SSL3_AD_BAD_RECORD_MAC);
	case SSL_AD_RECORD_OVERFLOW:	return(SSL3_AD_BAD_RECORD_MAC);
	case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
	case SSL_AD_HANDSHAKE_FAILURE:	return(SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_NO_CERTIFICATE:	return(SSL3_AD_NO_CERTIFICATE);
	case SSL_AD_BAD_CERTIFICATE:	return(SSL3_AD_BAD_CERTIFICATE);
	case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
	case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
	case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
	case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
	case SSL_AD_ILLEGAL_PARAMETER:	return(SSL3_AD_ILLEGAL_PARAMETER);
	case SSL_AD_UNKNOWN_CA:		return(SSL3_AD_BAD_CERTIFICATE);
	case SSL_AD_ACCESS_DENIED:	return(SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_DECODE_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_DECRYPT_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_EXPORT_RESTRICION:	return(SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_PROTOCOL_VERSION:	return(SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_INTERNAL_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_USER_CANCLED:	return(SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_NO_RENEGOTIATION:	return(-1); /* Don't send it :-) */
	default:			return(-1);
		}
	}
Commit	Line	Data
d02b48c6	1	/* ssl/s3_enc.c */
58964a49	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6 RE	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
	59	#include <stdio.h>
	60	#include "evp.h"
	61	#include "ssl_locl.h"
	62
	63	static unsigned char ssl3_pad_1[48]={
	64	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
	65	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
	66	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
67	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
68	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
69	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
70
71	static unsigned char ssl3_pad_2[48]={
72	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
73	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
74	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
75	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
76	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
77	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
78
58964a49 RE	79	#ifndef NO_PROTO
	80	static int ssl3_handshake_mac(SSL s, EVP_MD_CTX in_ctx,
	81	unsigned char sender, int len, unsigned char p);
	82	#else
	83	static int ssl3_handshake_mac();
	84	#endif
	85
	86	static void ssl3_generate_key_block(s,km,num)
	87	SSL *s;
	88	unsigned char *km;
	89	int num;
	90	{
	91	MD5_CTX m5;
	92	SHA_CTX s1;
	93	unsigned char buf[8],smd[SHA_DIGEST_LENGTH];
	94	unsigned char c='A';
	95	int i,j,k;
	96
	97	k=0;
	98	for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
	99	{
	100	k++;
	101	for (j=0; j<k; j++)
	102	buf[j]=c;
	103	c++;
	104	SHA1_Init( &s1);
	105	SHA1_Update(&s1,buf,k);
	106	SHA1_Update(&s1,s->session->master_key,
	107	s->session->master_key_length);
	108	SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
	109	SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
	110	SHA1_Final( smd,&s1);
	111
	112	MD5_Init( &m5);
	113	MD5_Update(&m5,s->session->master_key,
	114	s->session->master_key_length);
	115	MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
	116	if ((i+MD5_DIGEST_LENGTH) > num)
	117	{
	118	MD5_Final(smd,&m5);
	119	memcpy(km,smd,(num-i));
	120	}
	121	else
	122	MD5_Final(km,&m5);
	123
	124	km+=MD5_DIGEST_LENGTH;
	125	}
	126	memset(smd,0,SHA_DIGEST_LENGTH);
	127	}
	128
d02b48c6 RE	129	int ssl3_change_cipher_state(s,which)
	130	SSL *s;
	131	int which;
	132	{
	133	unsigned char p,key_block,*mac_secret;
	134	unsigned char exp_key[EVP_MAX_KEY_LENGTH];
	135	unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
	136	unsigned char ms,key,iv,er1,*er2;
	137	EVP_CIPHER_CTX *dd;
	138	EVP_CIPHER *c;
	139	SSL_COMPRESSION *comp;
	140	EVP_MD *m;
	141	MD5_CTX md;
	142	int exp,n,i,j,k;
	143
	144	exp=(s->s3->tmp.new_cipher->algorithms & SSL_EXPORT)?1:0;
	145	c=s->s3->tmp.new_sym_enc;
	146	m=s->s3->tmp.new_hash;
	147	comp=s->s3->tmp.new_compression;
	148	key_block=s->s3->tmp.key_block;
	149
	150	if (which & SSL3_CC_READ)
	151	{
	152	if ((s->enc_read_ctx == NULL) &&
	153	((s->enc_read_ctx=(EVP_CIPHER_CTX *)
	154	Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
	155	goto err;
	156	dd= s->enc_read_ctx;
	157	s->read_hash=m;
	158	s->read_compression=comp;
	159	memset(&(s->s3->read_sequence[0]),0,8);
	160	mac_secret= &(s->s3->read_mac_secret[0]);
	161	}
	162	else
	163	{
	164	if ((s->enc_write_ctx == NULL) &&
	165	((s->enc_write_ctx=(EVP_CIPHER_CTX *)
	166	Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
	167	goto err;
	168	dd= s->enc_write_ctx;
	169	s->write_hash=m;
	170	s->write_compression=comp;
	171	memset(&(s->s3->write_sequence[0]),0,8);
	172	mac_secret= &(s->s3->write_mac_secret[0]);
	173	}
	174
58964a49 RE	175	EVP_CIPHER_CTX_init(dd);
58964a49 RE	176
d02b48c6 RE	177	p=s->s3->tmp.key_block;
	178	i=EVP_MD_size(m);
	179	j=(exp)?5:EVP_CIPHER_key_length(c);
	180	k=EVP_CIPHER_iv_length(c);
	181	if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) \|\|
	182	(which == SSL3_CHANGE_CIPHER_SERVER_READ))
	183	{
	184	ms= &(p[ 0]); n=i+i;
	185	key= &(p[ n]); n+=j+j;
	186	iv= &(p[ n]); n+=k+k;
	187	er1= &(s->s3->client_random[0]);
	188	er2= &(s->s3->server_random[0]);
	189	}
	190	else
	191	{
	192	n=i;
	193	ms= &(p[ n]); n+=i+j;
	194	key= &(p[ n]); n+=j+k;
	195	iv= &(p[ n]); n+=k;
	196	er1= &(s->s3->server_random[0]);
	197	er2= &(s->s3->client_random[0]);
	198	}
	199
	200	if (n > s->s3->tmp.key_block_length)
	201	{
	202	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
	203	goto err2;
	204	}
	205
	206	memcpy(mac_secret,ms,i);
	207	if (exp)
	208	{
	209	/* In here I set both the read and write key/iv to the
	210	* same value since only the correct one will be used :-).
	211	*/
	212	MD5_Init(&md);
	213	MD5_Update(&md,key,j);
	214	MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
	215	MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
	216	MD5_Final(&(exp_key[0]),&md);
	217	key= &(exp_key[0]);
	218
58964a49 RE	219	if (k > 0)
	220	{
	221	MD5_Init(&md);
	222	MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
	223	MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
	224	MD5_Final(&(exp_iv[0]),&md);
	225	iv= &(exp_iv[0]);
	226	}
d02b48c6 RE	227	}
d02b48c6 RE	228
58964a49	229	s->session->key_arg_length=0;
d02b48c6 RE	230
d02b48c6 RE	231	EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
58964a49	232
d02b48c6 RE	233	memset(&(exp_key[0]),0,sizeof(exp_key));
	234	memset(&(exp_iv[0]),0,sizeof(exp_iv));
	235	return(1);
	236	err:
	237	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
	238	err2:
	239	return(0);
	240	}
	241
	242	int ssl3_setup_key_block(s)
	243	SSL *s;
	244	{
	245	unsigned char *p;
	246	EVP_CIPHER *c;
	247	EVP_MD *hash;
	248	int num,exp;
	249
	250	if (s->s3->tmp.key_block_length != 0)
	251	return(1);
	252
	253	if (!ssl_cipher_get_evp(s->session->cipher,&c,&hash))
	254	{
	255	SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
	256	return(0);
	257	}
	258
	259	s->s3->tmp.new_sym_enc=c;
	260	s->s3->tmp.new_hash=hash;
	261
	262	exp=(s->session->cipher->algorithms & SSL_EXPORT)?1:0;
	263
	264	num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
	265	num*=2;
	266
	267	ssl3_cleanup_key_block(s);
	268
	269	if ((p=(unsigned char *)Malloc(num)) == NULL)
	270	goto err;
	271
	272	s->s3->tmp.key_block_length=num;
	273	s->s3->tmp.key_block=p;
	274
	275	ssl3_generate_key_block(s,p,num);
	276
	277	return(1);
	278	err:
	279	SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
	280	return(0);
	281	}
	282
	283	void ssl3_cleanup_key_block(s)
	284	SSL *s;
	285	{
	286	if (s->s3->tmp.key_block != NULL)
	287	{
	288	memset(s->s3->tmp.key_block,0,
	289	s->s3->tmp.key_block_length);
	290	Free(s->s3->tmp.key_block);
	291	s->s3->tmp.key_block=NULL;
	292	}
	293	s->s3->tmp.key_block_length=0;
	294	}
	295
	296	int ssl3_enc(s,send)
297	SSL *s;
298	int send;
299	{
300	SSL3_RECORD *rec;
301	EVP_CIPHER_CTX *ds;
302	unsigned long l;
303	int bs,i;
304	EVP_CIPHER *enc;
305	SSL_COMPRESSION *comp;
306
307	if (send)
308	{
309	ds=s->enc_write_ctx;
310	rec= &(s->s3->wrec);
311	if (s->enc_write_ctx == NULL)
312	{ enc=NULL; comp=NULL; }
313	else
314	{
315	enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
316	comp=s->write_compression;
317	}
318	}
319	else
320	{
321	ds=s->enc_read_ctx;
322	rec= &(s->s3->rrec);
323	if (s->enc_read_ctx == NULL)
324	{ enc=NULL; comp=NULL; }
325	else
326	{
327	enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
328	comp=s->read_compression;
329	}
330	}
331
332	if ((s->session == NULL) \|\| (ds == NULL) \|\|
333	((enc == NULL) && (comp == NULL)))
334	{
335	memcpy(rec->data,rec->input,rec->length);
336	rec->input=rec->data;
337	}
338	else
339	{
340	l=rec->length;
341	bs=EVP_CIPHER_block_size(ds->cipher);
342
343	/* This should be using (bs-1) and bs instead of 7 and 8 */
344	if ((bs != 1) && send)
345	{
346	i=bs-((int)l%bs);
347
348	/* we need to add 'i-1' padding bytes */
349	l+=i;
350	rec->length+=i;
351	rec->input[l-1]=(i-1);
352	}
353
354	EVP_Cipher(ds,rec->data,rec->input,l);
355
356	if ((bs != 1) && !send)
357	{
358	i=rec->data[l-1]+1;
359	if (i > bs)
360	{
361	SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
58964a49	362	ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
d02b48c6 RE	363	return(0);
	364	}
	365	rec->length-=i;
	366	}
	367	}
	368	return(1);
	369	}
	370
	371	void ssl3_init_finished_mac(s)
	372	SSL *s;
	373	{
58964a49 RE	374	EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
58964a49 RE	375	EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
d02b48c6 RE	376	}
	377
	378	void ssl3_finish_mac(s,buf,len)
	379	SSL *s;
	380	unsigned char *buf;
	381	int len;
	382	{
	383	EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
	384	EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
	385	}
	386
58964a49 RE	387	int ssl3_cert_verify_mac(s,ctx,p)
	388	SSL *s;
	389	EVP_MD_CTX *ctx;
	390	unsigned char *p;
	391	{
	392	return(ssl3_handshake_mac(s,ctx,NULL,0,p));
	393	}
	394
	395	int ssl3_final_finish_mac(s,ctx1,ctx2,sender,len,p)
	396	SSL *s;
	397	EVP_MD_CTX ctx1,ctx2;
	398	unsigned char *sender;
	399	int len;
	400	unsigned char *p;
	401	{
	402	int ret;
	403
	404	ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
	405	p+=ret;
	406	ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
	407	return(ret);
	408	}
	409
	410	static int ssl3_handshake_mac(s,in_ctx,sender,len,p)
d02b48c6 RE	411	SSL *s;
	412	EVP_MD_CTX *in_ctx;
	413	unsigned char *sender;
58964a49	414	int len;
d02b48c6 RE	415	unsigned char *p;
	416	{
	417	unsigned int ret;
	418	int npad,n;
	419	unsigned int i;
	420	unsigned char md_buf[EVP_MAX_MD_SIZE];
	421	EVP_MD_CTX ctx;
	422
	423	memcpy(&ctx,in_ctx,sizeof(EVP_MD_CTX));
	424
	425	n=EVP_MD_CTX_size(&ctx);
	426	npad=(48/n)*n;
	427
	428	if (sender != NULL)
58964a49	429	EVP_DigestUpdate(&ctx,sender,len);
d02b48c6 RE	430	EVP_DigestUpdate(&ctx,s->session->master_key,
	431	s->session->master_key_length);
	432	EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
	433	EVP_DigestFinal(&ctx,md_buf,&i);
	434
	435	EVP_DigestInit(&ctx,EVP_MD_CTX_type(&ctx));
	436	EVP_DigestUpdate(&ctx,s->session->master_key,
	437	s->session->master_key_length);
	438	EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
	439	EVP_DigestUpdate(&ctx,md_buf,i);
	440	EVP_DigestFinal(&ctx,p,&ret);
	441
	442	memset(&ctx,0,sizeof(EVP_MD_CTX));
	443
	444	return((int)ret);
	445	}
	446
	447	int ssl3_mac(ssl,md,send)
	448	SSL *ssl;
	449	unsigned char *md;
	450	int send;
	451	{
	452	SSL3_RECORD *rec;
	453	unsigned char mac_sec,seq;
	454	EVP_MD_CTX md_ctx;
	455	EVP_MD *hash;
	456	unsigned char *p,rec_char;
	457	unsigned int md_size;
	458	int npad,i;
	459
	460	if (send)
	461	{
	462	rec= &(ssl->s3->wrec);
	463	mac_sec= &(ssl->s3->write_mac_secret[0]);
	464	seq= &(ssl->s3->write_sequence[0]);
	465	hash=ssl->write_hash;
	466	}
	467	else
	468	{
	469	rec= &(ssl->s3->rrec);
	470	mac_sec= &(ssl->s3->read_mac_secret[0]);
	471	seq= &(ssl->s3->read_sequence[0]);
	472	hash=ssl->read_hash;
	473	}
	474
	475	md_size=EVP_MD_size(hash);
	476	npad=(48/md_size)*md_size;
	477
d02b48c6 RE	478	/* Chop the digest off the end :-) */
	479
	480	EVP_DigestInit( &md_ctx,hash);
	481	EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
	482	EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
	483	EVP_DigestUpdate(&md_ctx,seq,8);
	484	rec_char=rec->type;
	485	EVP_DigestUpdate(&md_ctx,&rec_char,1);
	486	p=md;
	487	s2n(rec->length,p);
	488	EVP_DigestUpdate(&md_ctx,md,2);
	489	EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
	490	EVP_DigestFinal( &md_ctx,md,NULL);
	491
	492	EVP_DigestInit( &md_ctx,hash);
	493	EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
	494	EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
	495	EVP_DigestUpdate(&md_ctx,md,md_size);
	496	EVP_DigestFinal( &md_ctx,md,&md_size);
	497
	498	for (i=7; i>=0; i--)
	499	if (++seq[i]) break;
	500
d02b48c6 RE	501	return(md_size);
	502	}
	503
	504	int ssl3_generate_master_secret(s,out,p,len)
	505	SSL *s;
	506	unsigned char *out;
	507	unsigned char *p;
	508	int len;
	509	{
	510	static unsigned char *salt[3]={
	511	(unsigned char *)"A",
	512	(unsigned char *)"BB",
	513	(unsigned char *)"CCC",
	514	};
	515	unsigned char buf[EVP_MAX_MD_SIZE];
	516	EVP_MD_CTX ctx;
	517	int i,ret=0;
	518	unsigned int n;
	519
	520	for (i=0; i<3; i++)
	521	{
58964a49	522	EVP_DigestInit(&ctx,s->ctx->sha1);
d02b48c6 RE	523	EVP_DigestUpdate(&ctx,salt[i],strlen((char *)salt[i]));
	524	EVP_DigestUpdate(&ctx,p,len);
	525	EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
	526	SSL3_RANDOM_SIZE);
	527	EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
	528	SSL3_RANDOM_SIZE);
	529	EVP_DigestFinal(&ctx,buf,&n);
	530
58964a49	531	EVP_DigestInit(&ctx,s->ctx->md5);
d02b48c6 RE	532	EVP_DigestUpdate(&ctx,p,len);
	533	EVP_DigestUpdate(&ctx,buf,n);
	534	EVP_DigestFinal(&ctx,out,&n);
	535	out+=n;
	536	ret+=n;
	537	}
	538	return(ret);
	539	}
	540
58964a49 RE	541	int ssl3_alert_code(code)
	542	int code;
	543	{
	544	switch (code)
	545	{
	546	case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
	547	case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
	548	case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
	549	case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
	550	case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
	551	case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
	552	case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
	553	case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
	554	case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
	555	case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
	556	case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
	557	case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
	558	case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
	559	case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
	560	case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
	561	case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
	562	case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
	563	case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
	564	case SSL_AD_EXPORT_RESTRICION: return(SSL3_AD_HANDSHAKE_FAILURE);
	565	case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
	566	case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
	567	case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
	568	case SSL_AD_USER_CANCLED: return(SSL3_AD_HANDSHAKE_FAILURE);
	569	case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */
	570	default: return(-1);
	571	}
	572	}
	573