sl@0: /* crypto/evp/bio_ber.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: #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: 
sl@0: static int ber_write(BIO *h,char *buf,int num);
sl@0: static int ber_read(BIO *h,char *buf,int size);
sl@0: /*static int ber_puts(BIO *h,char *str); */
sl@0: /*static int ber_gets(BIO *h,char *str,int size); */
sl@0: static long ber_ctrl(BIO *h,int cmd,long arg1,char *arg2);
sl@0: static int ber_new(BIO *h);
sl@0: static int ber_free(BIO *data);
sl@0: static long ber_callback_ctrl(BIO *h,int cmd,void *(*fp)());
sl@0: #define BER_BUF_SIZE	(32)
sl@0: 
sl@0: /* This is used to hold the state of the BER objects being read. */
sl@0: typedef struct ber_struct
sl@0: 	{
sl@0: 	int tag;
sl@0: 	int class;
sl@0: 	long length;
sl@0: 	int inf;
sl@0: 	int num_left;
sl@0: 	int depth;
sl@0: 	} BER_CTX;
sl@0: 
sl@0: typedef struct bio_ber_struct
sl@0: 	{
sl@0: 	int tag;
sl@0: 	int class;
sl@0: 	long length;
sl@0: 	int inf;
sl@0: 
sl@0: 	/* most of the following are used when doing non-blocking IO */
sl@0: 	/* reading */
sl@0: 	long num_left;	/* number of bytes still to read/write in block */
sl@0: 	int depth;	/* used with indefinite encoding. */
sl@0: 	int finished;	/* No more read data */
sl@0: 
sl@0: 	/* writting */ 
sl@0: 	char *w_addr;
sl@0: 	int w_offset;
sl@0: 	int w_left;
sl@0: 
sl@0: 	int buf_len;
sl@0: 	int buf_off;
sl@0: 	unsigned char buf[BER_BUF_SIZE];
sl@0: 	} BIO_BER_CTX;
sl@0: 
sl@0: static BIO_METHOD methods_ber=
sl@0: 	{
sl@0: 	BIO_TYPE_CIPHER,"cipher",
sl@0: 	ber_write,
sl@0: 	ber_read,
sl@0: 	NULL, /* ber_puts, */
sl@0: 	NULL, /* ber_gets, */
sl@0: 	ber_ctrl,
sl@0: 	ber_new,
sl@0: 	ber_free,
sl@0: 	ber_callback_ctrl,
sl@0: 	};
sl@0: 
sl@0: BIO_METHOD *BIO_f_ber(void)
sl@0: 	{
sl@0: 	return(&methods_ber);
sl@0: 	}
sl@0: 
sl@0: static int ber_new(BIO *bi)
sl@0: 	{
sl@0: 	BIO_BER_CTX *ctx;
sl@0: 
sl@0: 	ctx=(BIO_BER_CTX *)OPENSSL_malloc(sizeof(BIO_BER_CTX));
sl@0: 	if (ctx == NULL) return(0);
sl@0: 
sl@0: 	memset((char *)ctx,0,sizeof(BIO_BER_CTX));
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 ber_free(BIO *a)
sl@0: 	{
sl@0: 	BIO_BER_CTX *b;
sl@0: 
sl@0: 	if (a == NULL) return(0);
sl@0: 	b=(BIO_BER_CTX *)a->ptr;
sl@0: 	OPENSSL_cleanse(a->ptr,sizeof(BIO_BER_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: int bio_ber_get_header(BIO *bio, BIO_BER_CTX *ctx)
sl@0: 	{
sl@0: 	char buf[64];
sl@0: 	int i,j,n;
sl@0: 	int ret;
sl@0: 	unsigned char *p;
sl@0: 	unsigned long length
sl@0: 	int tag;
sl@0: 	int class;
sl@0: 	long max;
sl@0: 
sl@0: 	BIO_clear_retry_flags(b);
sl@0: 
sl@0: 	/* Pack the buffer down if there is a hole at the front */
sl@0: 	if (ctx->buf_off != 0)
sl@0: 		{
sl@0: 		p=ctx->buf;
sl@0: 		j=ctx->buf_off;
sl@0: 		n=ctx->buf_len-j;
sl@0: 		for (i=0; i<n; i++)
sl@0: 			{
sl@0: 			p[0]=p[j];
sl@0: 			p++;
sl@0: 			}
sl@0: 		ctx->buf_len-j;
sl@0: 		ctx->buf_off=0;
sl@0: 		}
sl@0: 
sl@0: 	/* If there is more room, read some more data */
sl@0: 	i=BER_BUF_SIZE-ctx->buf_len;
sl@0: 	if (i)
sl@0: 		{
sl@0: 		i=BIO_read(bio->next_bio,&(ctx->buf[ctx->buf_len]),i);
sl@0: 		if (i <= 0)
sl@0: 			{
sl@0: 			BIO_copy_next_retry(b);
sl@0: 			return(i);
sl@0: 			}
sl@0: 		else
sl@0: 			ctx->buf_len+=i;
sl@0: 		}
sl@0: 
sl@0: 	max=ctx->buf_len;
sl@0: 	p=ctx->buf;
sl@0: 	ret=ASN1_get_object(&p,&length,&tag,&class,max);
sl@0: 
sl@0: 	if (ret & 0x80)
sl@0: 		{
sl@0: 		if ((ctx->buf_len < BER_BUF_SIZE) &&
sl@0: 			(ERR_GET_REASON(ERR_peek_error()) == ASN1_R_TOO_LONG))
sl@0: 			{
sl@0: 			ERR_clear_error(); /* clear the error */
sl@0: 			BIO_set_retry_read(b);
sl@0: 			}
sl@0: 		return(-1);
sl@0: 		}
sl@0: 
sl@0: 	/* We have no error, we have a header, so make use of it */
sl@0: 
sl@0: 	if ((ctx->tag  >= 0) && (ctx->tag != tag))
sl@0: 		{
sl@0: 		BIOerr(BIO_F_BIO_BER_GET_HEADER,BIO_R_TAG_MISMATCH);
sl@0: 		sprintf(buf,"tag=%d, got %d",ctx->tag,tag);
sl@0: 		ERR_add_error_data(1,buf);
sl@0: 		return(-1);
sl@0: 		}
sl@0: 	if (ret & 0x01)
sl@0: 	if (ret & V_ASN1_CONSTRUCTED)
sl@0: 	}
sl@0: 	
sl@0: static int ber_read(BIO *b, char *out, int outl)
sl@0: 	{
sl@0: 	int ret=0,i,n;
sl@0: 	BIO_BER_CTX *ctx;
sl@0: 
sl@0: 	BIO_clear_retry_flags(b);
sl@0: 
sl@0: 	if (out == NULL) return(0);
sl@0: 	ctx=(BIO_BER_CTX *)b->ptr;
sl@0: 
sl@0: 	if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
sl@0: 
sl@0: 	if (ctx->finished) return(0);
sl@0: 
sl@0: again:
sl@0: 	/* First see if we are half way through reading a block */
sl@0: 	if (ctx->num_left > 0)
sl@0: 		{
sl@0: 		if (ctx->num_left < outl)
sl@0: 			n=ctx->num_left;
sl@0: 		else
sl@0: 			n=outl;
sl@0: 		i=BIO_read(b->next_bio,out,n);
sl@0: 		if (i <= 0)
sl@0: 			{
sl@0: 			BIO_copy_next_retry(b);
sl@0: 			return(i);
sl@0: 			}
sl@0: 		ctx->num_left-=i;
sl@0: 		outl-=i;
sl@0: 		ret+=i;
sl@0: 		if (ctx->num_left <= 0)
sl@0: 			{
sl@0: 			ctx->depth--;
sl@0: 			if (ctx->depth <= 0)
sl@0: 				ctx->finished=1;
sl@0: 			}
sl@0: 		if (outl <= 0)
sl@0: 			return(ret);
sl@0: 		else
sl@0: 			goto again;
sl@0: 		}
sl@0: 	else	/* we need to read another BER header */
sl@0: 		{
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: static int ber_write(BIO *b, 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(i);
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 ber_ctrl(BIO *b, int cmd, long num, char *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: 
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.berrypt);
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=ber_write(b,NULL,0);
sl@0: 			if (i < 0)
sl@0: 				{
sl@0: 				ret=i;
sl@0: 				break;
sl@0: 				}
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: 
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 ber_callback_ctrl(BIO *b, int cmd, void *(*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: void BIO_set_cipher(BIO *b, EVP_CIPHER *c, unsigned char *k, unsigned char *i,
sl@0: 	     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,(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,(char *)c,BIO_CTRL_SET,e,1L);
sl@0: 	}
sl@0: