sl@0: /* crypto/evp/bio_enc.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0:  
sl@0: #include <stdio.h>
sl@0: #include <errno.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/buffer.h>
sl@0: #include <openssl/evp.h>
sl@0: #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))
sl@0: #include "libcrypto_wsd_macros.h"
sl@0: #include "libcrypto_wsd.h"
sl@0: #endif
sl@0: 
sl@0: static int enc_write(BIO *h, const char *buf, int num);
sl@0: static int enc_read(BIO *h, char *buf, int size);
sl@0: /*static int enc_puts(BIO *h, const char *str); */
sl@0: /*static int enc_gets(BIO *h, char *str, int size); */
sl@0: static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2);
sl@0: static int enc_new(BIO *h);
sl@0: static int enc_free(BIO *data);
sl@0: static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps);
sl@0: #define ENC_BLOCK_SIZE	(1024*4)
sl@0: #define BUF_OFFSET	(EVP_MAX_BLOCK_LENGTH*2)
sl@0: 
sl@0: typedef struct enc_struct
sl@0: 	{
sl@0: 	int buf_len;
sl@0: 	int buf_off;
sl@0: 	int cont;		/* <= 0 when finished */
sl@0: 	int finished;
sl@0: 	int ok;			/* bad decrypt */
sl@0: 	EVP_CIPHER_CTX cipher;
sl@0: 	/* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate
sl@0: 	 * can return up to a block more data than is presented to it
sl@0: 	 */
sl@0: 	char buf[ENC_BLOCK_SIZE+BUF_OFFSET+2];
sl@0: 	} BIO_ENC_CTX;
sl@0: 
sl@0: #ifndef EMULATOR
sl@0: static BIO_METHOD methods_enc=
sl@0: 	{
sl@0: 	BIO_TYPE_CIPHER,"cipher",
sl@0: 	enc_write,
sl@0: 	enc_read,
sl@0: 	NULL, /* enc_puts, */
sl@0: 	NULL, /* enc_gets, */
sl@0: 	enc_ctrl,
sl@0: 	enc_new,
sl@0: 	enc_free,
sl@0: 	enc_callback_ctrl,
sl@0: 	};
sl@0: #else
sl@0: GET_STATIC_VAR_FROM_TLS(methods_enc,bio_enc,BIO_METHOD)
sl@0: #define methods_enc (*GET_WSD_VAR_NAME(methods_enc,bio_enc, s)())
sl@0: const BIO_METHOD temp_s_methods_enc=
sl@0: 	{
sl@0: 	BIO_TYPE_CIPHER,"cipher",
sl@0: 	enc_write,
sl@0: 	enc_read,
sl@0: 	NULL, /* enc_puts, */
sl@0: 	NULL, /* enc_gets, */
sl@0: 	enc_ctrl,
sl@0: 	enc_new,
sl@0: 	enc_free,
sl@0: 	enc_callback_ctrl,
sl@0: 	};
sl@0: 
sl@0: #endif	
sl@0: 
sl@0: EXPORT_C BIO_METHOD *BIO_f_cipher(void)
sl@0: 	{
sl@0: 	return(&methods_enc);
sl@0: 	}
sl@0: 
sl@0: static int enc_new(BIO *bi)
sl@0: 	{
sl@0: 	BIO_ENC_CTX *ctx;
sl@0: 
sl@0: 	ctx=(BIO_ENC_CTX *)OPENSSL_malloc(sizeof(BIO_ENC_CTX));
sl@0: 	if (ctx == NULL) return(0);
sl@0: 	EVP_CIPHER_CTX_init(&ctx->cipher);
sl@0: 
sl@0: 	ctx->buf_len=0;
sl@0: 	ctx->buf_off=0;
sl@0: 	ctx->cont=1;
sl@0: 	ctx->finished=0;
sl@0: 	ctx->ok=1;
sl@0: 
sl@0: 	bi->init=0;
sl@0: 	bi->ptr=(char *)ctx;
sl@0: 	bi->flags=0;
sl@0: 	return(1);
sl@0: 	}
sl@0: 
sl@0: static int enc_free(BIO *a)
sl@0: 	{
sl@0: 	BIO_ENC_CTX *b;
sl@0: 
sl@0: 	if (a == NULL) return(0);
sl@0: 	b=(BIO_ENC_CTX *)a->ptr;
sl@0: 	EVP_CIPHER_CTX_cleanup(&(b->cipher));
sl@0: 	OPENSSL_cleanse(a->ptr,sizeof(BIO_ENC_CTX));
sl@0: 	OPENSSL_free(a->ptr);
sl@0: 	a->ptr=NULL;
sl@0: 	a->init=0;
sl@0: 	a->flags=0;
sl@0: 	return(1);
sl@0: 	}
sl@0: 	
sl@0: static int enc_read(BIO *b, char *out, int outl)
sl@0: 	{
sl@0: 	int ret=0,i;
sl@0: 	BIO_ENC_CTX *ctx;
sl@0: 
sl@0: 	if (out == NULL) return(0);
sl@0: 	ctx=(BIO_ENC_CTX *)b->ptr;
sl@0: 
sl@0: 	if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
sl@0: 
sl@0: 	/* First check if there are bytes decoded/encoded */
sl@0: 	if (ctx->buf_len > 0)
sl@0: 		{
sl@0: 		i=ctx->buf_len-ctx->buf_off;
sl@0: 		if (i > outl) i=outl;
sl@0: 		memcpy(out,&(ctx->buf[ctx->buf_off]),i);
sl@0: 		ret=i;
sl@0: 		out+=i;
sl@0: 		outl-=i;
sl@0: 		ctx->buf_off+=i;
sl@0: 		if (ctx->buf_len == ctx->buf_off)
sl@0: 			{
sl@0: 			ctx->buf_len=0;
sl@0: 			ctx->buf_off=0;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	/* At this point, we have room of outl bytes and an empty
sl@0: 	 * buffer, so we should read in some more. */
sl@0: 
sl@0: 	while (outl > 0)
sl@0: 		{
sl@0: 		if (ctx->cont <= 0) break;
sl@0: 
sl@0: 		/* read in at IV offset, read the EVP_Cipher
sl@0: 		 * documentation about why */
sl@0: 		i=BIO_read(b->next_bio,&(ctx->buf[BUF_OFFSET]),ENC_BLOCK_SIZE);
sl@0: 
sl@0: 		if (i <= 0)
sl@0: 			{
sl@0: 			/* Should be continue next time we are called? */
sl@0: 			if (!BIO_should_retry(b->next_bio))
sl@0: 				{
sl@0: 				ctx->cont=i;
sl@0: 				i=EVP_CipherFinal_ex(&(ctx->cipher),
sl@0: 					(unsigned char *)ctx->buf,
sl@0: 					&(ctx->buf_len));
sl@0: 				ctx->ok=i;
sl@0: 				ctx->buf_off=0;
sl@0: 				}
sl@0: 			else 
sl@0: 				{
sl@0: 				ret=(ret == 0)?i:ret;
sl@0: 				break;
sl@0: 				}
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			EVP_CipherUpdate(&(ctx->cipher),
sl@0: 				(unsigned char *)ctx->buf,&ctx->buf_len,
sl@0: 				(unsigned char *)&(ctx->buf[BUF_OFFSET]),i);
sl@0: 			ctx->cont=1;
sl@0: 			/* Note: it is possible for EVP_CipherUpdate to
sl@0: 			 * decrypt zero bytes because this is or looks like
sl@0: 			 * the final block: if this happens we should retry
sl@0: 			 * and either read more data or decrypt the final
sl@0: 			 * block
sl@0: 			 */
sl@0: 			if(ctx->buf_len == 0) continue;
sl@0: 			}
sl@0: 
sl@0: 		if (ctx->buf_len <= outl)
sl@0: 			i=ctx->buf_len;
sl@0: 		else
sl@0: 			i=outl;
sl@0: 		if (i <= 0) break;
sl@0: 		memcpy(out,ctx->buf,i);
sl@0: 		ret+=i;
sl@0: 		ctx->buf_off=i;
sl@0: 		outl-=i;
sl@0: 		out+=i;
sl@0: 		}
sl@0: 
sl@0: 	BIO_clear_retry_flags(b);
sl@0: 	BIO_copy_next_retry(b);
sl@0: 	return((ret == 0)?ctx->cont:ret);
sl@0: 	}
sl@0: 
sl@0: static int enc_write(BIO *b, const char *in, int inl)
sl@0: 	{
sl@0: 	int ret=0,n,i;
sl@0: 	BIO_ENC_CTX *ctx;
sl@0: 
sl@0: 	ctx=(BIO_ENC_CTX *)b->ptr;
sl@0: 	ret=inl;
sl@0: 
sl@0: 	BIO_clear_retry_flags(b);
sl@0: 	n=ctx->buf_len-ctx->buf_off;
sl@0: 	while (n > 0)
sl@0: 		{
sl@0: 		i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
sl@0: 		if (i <= 0)
sl@0: 			{
sl@0: 			BIO_copy_next_retry(b);
sl@0: 			return(i);
sl@0: 			}
sl@0: 		ctx->buf_off+=i;
sl@0: 		n-=i;
sl@0: 		}
sl@0: 	/* at this point all pending data has been written */
sl@0: 
sl@0: 	if ((in == NULL) || (inl <= 0)) return(0);
sl@0: 
sl@0: 	ctx->buf_off=0;
sl@0: 	while (inl > 0)
sl@0: 		{
sl@0: 		n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl;
sl@0: 		EVP_CipherUpdate(&(ctx->cipher),
sl@0: 			(unsigned char *)ctx->buf,&ctx->buf_len,
sl@0: 			(unsigned char *)in,n);
sl@0: 		inl-=n;
sl@0: 		in+=n;
sl@0: 
sl@0: 		ctx->buf_off=0;
sl@0: 		n=ctx->buf_len;
sl@0: 		while (n > 0)
sl@0: 			{
sl@0: 			i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
sl@0: 			if (i <= 0)
sl@0: 				{
sl@0: 				BIO_copy_next_retry(b);
sl@0: 				return (ret == inl) ? i : ret - inl;
sl@0: 				}
sl@0: 			n-=i;
sl@0: 			ctx->buf_off+=i;
sl@0: 			}
sl@0: 		ctx->buf_len=0;
sl@0: 		ctx->buf_off=0;
sl@0: 		}
sl@0: 	BIO_copy_next_retry(b);
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: static long enc_ctrl(BIO *b, int cmd, long num, void *ptr)
sl@0: 	{
sl@0: 	BIO *dbio;
sl@0: 	BIO_ENC_CTX *ctx,*dctx;
sl@0: 	long ret=1;
sl@0: 	int i;
sl@0: 	EVP_CIPHER_CTX **c_ctx;
sl@0: 
sl@0: 	ctx=(BIO_ENC_CTX *)b->ptr;
sl@0: 
sl@0: 	switch (cmd)
sl@0: 		{
sl@0: 	case BIO_CTRL_RESET:
sl@0: 		ctx->ok=1;
sl@0: 		ctx->finished=0;
sl@0: 		EVP_CipherInit_ex(&(ctx->cipher),NULL,NULL,NULL,NULL,
sl@0: 			ctx->cipher.encrypt);
sl@0: 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 	case BIO_CTRL_EOF:	/* More to read */
sl@0: 		if (ctx->cont <= 0)
sl@0: 			ret=1;
sl@0: 		else
sl@0: 			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 	case BIO_CTRL_WPENDING:
sl@0: 		ret=ctx->buf_len-ctx->buf_off;
sl@0: 		if (ret <= 0)
sl@0: 			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 	case BIO_CTRL_PENDING: /* More to read in buffer */
sl@0: 		ret=ctx->buf_len-ctx->buf_off;
sl@0: 		if (ret <= 0)
sl@0: 			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 	case BIO_CTRL_FLUSH:
sl@0: 		/* do a final write */
sl@0: again:
sl@0: 		while (ctx->buf_len != ctx->buf_off)
sl@0: 			{
sl@0: 			i=enc_write(b,NULL,0);
sl@0: 			if (i < 0)
sl@0: 				return i;
sl@0: 			}
sl@0: 
sl@0: 		if (!ctx->finished)
sl@0: 			{
sl@0: 			ctx->finished=1;
sl@0: 			ctx->buf_off=0;
sl@0: 			ret=EVP_CipherFinal_ex(&(ctx->cipher),
sl@0: 				(unsigned char *)ctx->buf,
sl@0: 				&(ctx->buf_len));
sl@0: 			ctx->ok=(int)ret;
sl@0: 			if (ret <= 0) break;
sl@0: 
sl@0: 			/* push out the bytes */
sl@0: 			goto again;
sl@0: 			}
sl@0: 		
sl@0: 		/* Finally flush the underlying BIO */
sl@0: 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 	case BIO_C_GET_CIPHER_STATUS:
sl@0: 		ret=(long)ctx->ok;
sl@0: 		break;
sl@0: 	case BIO_C_DO_STATE_MACHINE:
sl@0: 		BIO_clear_retry_flags(b);
sl@0: 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		BIO_copy_next_retry(b);
sl@0: 		break;
sl@0: 	case BIO_C_GET_CIPHER_CTX:
sl@0: 		c_ctx=(EVP_CIPHER_CTX **)ptr;
sl@0: 		(*c_ctx)= &(ctx->cipher);
sl@0: 		b->init=1;
sl@0: 		break;
sl@0: 	case BIO_CTRL_DUP:
sl@0: 		dbio=(BIO *)ptr;
sl@0: 		dctx=(BIO_ENC_CTX *)dbio->ptr;
sl@0: 		memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher));
sl@0: 		dbio->init=1;
sl@0: 		break;
sl@0: 	default:
sl@0: 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 		}
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
sl@0: 	{
sl@0: 	long ret=1;
sl@0: 
sl@0: 	if (b->next_bio == NULL) return(0);
sl@0: 	switch (cmd)
sl@0: 		{
sl@0: 	default:
sl@0: 		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
sl@0: 		break;
sl@0: 		}
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: /*
sl@0: void BIO_set_cipher_ctx(b,c)
sl@0: BIO *b;
sl@0: EVP_CIPHER_ctx *c;
sl@0: 	{
sl@0: 	if (b == NULL) return;
sl@0: 
sl@0: 	if ((b->callback != NULL) &&
sl@0: 		(b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
sl@0: 		return;
sl@0: 
sl@0: 	b->init=1;
sl@0: 	ctx=(BIO_ENC_CTX *)b->ptr;
sl@0: 	memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
sl@0: 	
sl@0: 	if (b->callback != NULL)
sl@0: 		b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
sl@0: 	}
sl@0: */
sl@0: 
sl@0: EXPORT_C void BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k,
sl@0: 	     const unsigned char *i, int e)
sl@0: 	{
sl@0: 	BIO_ENC_CTX *ctx;
sl@0: 
sl@0: 	if (b == NULL) return;
sl@0: 
sl@0: 	if ((b->callback != NULL) &&
sl@0: 		(b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,0L) <= 0))
sl@0: 		return;
sl@0: 
sl@0: 	b->init=1;
sl@0: 	ctx=(BIO_ENC_CTX *)b->ptr;
sl@0: 	EVP_CipherInit_ex(&(ctx->cipher),c,NULL, k,i,e);
sl@0: 	
sl@0: 	if (b->callback != NULL)
sl@0: 		b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,1L);
sl@0: 	}
sl@0: