--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ssl/libssl/src/d1_enc.c	Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,281 @@
+/* ssl/d1_enc.c */
+/* 
+ * DTLS implementation written by Nagendra Modadugu
+ * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2005 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 (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 "ssl_locl.h"
+#include <openssl/comp.h>
+#include <openssl/evp.h>
+#include <openssl/hmac.h>
+#include <openssl/md5.h>
+#include <openssl/rand.h>
+
+
+int dtls1_enc(SSL *s, int send)
+	{
+	SSL3_RECORD *rec;
+	EVP_CIPHER_CTX *ds;
+	unsigned long l;
+	int bs,i,ii,j,k,n=0;
+	const EVP_CIPHER *enc;
+
+	if (send)
+		{
+		if (s->write_hash != NULL)
+			n=EVP_MD_size(s->write_hash);
+		ds=s->enc_write_ctx;
+		rec= &(s->s3->wrec);
+		if (s->enc_write_ctx == NULL)
+			enc=NULL;
+		else
+			{
+			enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
+			if ( rec->data != rec->input)
+				/* we can't write into the input stream */
+				fprintf(stderr, "%s:%d: rec->data != rec->input\n",
+					__FILE__, __LINE__);
+			else if ( EVP_CIPHER_block_size(ds->cipher) > 1)
+				{
+				if (!RAND_bytes(rec->input, EVP_CIPHER_block_size(ds->cipher)))
+					return -1;
+				}
+			}
+		}
+	else
+		{
+		if (s->read_hash != NULL)
+			n=EVP_MD_size(s->read_hash);
+		ds=s->enc_read_ctx;
+		rec= &(s->s3->rrec);
+		if (s->enc_read_ctx == NULL)
+			enc=NULL;
+		else
+			enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
+		}
+
+#ifdef KSSL_DEBUG
+	printf("dtls1_enc(%d)\n", send);
+#endif    /* KSSL_DEBUG */
+
+	if ((s->session == NULL) || (ds == NULL) ||
+		(enc == NULL))
+		{
+		memmove(rec->data,rec->input,rec->length);
+		rec->input=rec->data;
+		}
+	else
+		{
+		l=rec->length;
+		bs=EVP_CIPHER_block_size(ds->cipher);
+
+		if ((bs != 1) && send)
+			{
+			i=bs-((int)l%bs);
+
+			/* Add weird padding of upto 256 bytes */
+
+			/* we need to add 'i' padding bytes of value j */
+			j=i-1;
+			if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
+				{
+				if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
+					j++;
+				}
+			for (k=(int)l; k<(int)(l+i); k++)
+				rec->input[k]=j;
+			l+=i;
+			rec->length+=i;
+			}
+
+#ifdef KSSL_DEBUG
+		{
+                unsigned long ui;
+		printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
+                        ds,rec->data,rec->input,l);
+		printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
+                        ds->buf_len, ds->cipher->key_len,
+                        DES_KEY_SZ, DES_SCHEDULE_SZ,
+                        ds->cipher->iv_len);
+		printf("\t\tIV: ");
+		for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
+		printf("\n");
+		printf("\trec->input=");
+		for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
+		printf("\n");
+		}
+#endif	/* KSSL_DEBUG */
+
+		if (!send)
+			{
+			if (l == 0 || l%bs != 0)
+				{
+				SSLerr(SSL_F_DTLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
+				ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
+				return 0;
+				}
+			}
+		
+		EVP_Cipher(ds,rec->data,rec->input,l);
+
+#ifdef KSSL_DEBUG
+		{
+                unsigned long i;
+                printf("\trec->data=");
+		for (i=0; i<l; i++)
+                        printf(" %02x", rec->data[i]);  printf("\n");
+                }
+#endif	/* KSSL_DEBUG */
+
+		if ((bs != 1) && !send)
+			{
+			ii=i=rec->data[l-1]; /* padding_length */
+			i++;
+			if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
+				{
+				/* First packet is even in size, so check */
+				if ((memcmp(s->s3->read_sequence,
+					"\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
+					s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
+				if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
+					i--;
+				}
+			/* TLS 1.0 does not bound the number of padding bytes by the block size.
+			 * All of them must have value 'padding_length'. */
+			if (i > (int)rec->length)
+				{
+				/* Incorrect padding. SSLerr() and ssl3_alert are done
+				 * by caller: we don't want to reveal whether this is
+				 * a decryption error or a MAC verification failure
+				 * (see http://www.openssl.org/~bodo/tls-cbc.txt) 
+				 */
+				return -1;
+				}
+			for (j=(int)(l-i); j<(int)l; j++)
+				{
+				if (rec->data[j] != ii)
+					{
+					/* Incorrect padding */
+					return -1;
+					}
+				}
+			rec->length-=i;
+
+			rec->data += bs;    /* skip the implicit IV */
+			rec->input += bs;
+			rec->length -= bs;
+			}
+		}
+	return(1);
+	}
+