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| Current File : //usr/src/crypto/openssl/crypto/pkcs7/bio_ber.c |
/* crypto/evp/bio_ber.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 <errno.h>
#include "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/evp.h>
static int ber_write(BIO *h,char *buf,int num);
static int ber_read(BIO *h,char *buf,int size);
/*static int ber_puts(BIO *h,char *str); */
/*static int ber_gets(BIO *h,char *str,int size); */
static long ber_ctrl(BIO *h,int cmd,long arg1,char *arg2);
static int ber_new(BIO *h);
static int ber_free(BIO *data);
static long ber_callback_ctrl(BIO *h,int cmd,void *(*fp)());
#define BER_BUF_SIZE (32)
/* This is used to hold the state of the BER objects being read. */
typedef struct ber_struct
{
int tag;
int class;
long length;
int inf;
int num_left;
int depth;
} BER_CTX;
typedef struct bio_ber_struct
{
int tag;
int class;
long length;
int inf;
/* most of the following are used when doing non-blocking IO */
/* reading */
long num_left; /* number of bytes still to read/write in block */
int depth; /* used with indefinite encoding. */
int finished; /* No more read data */
/* writting */
char *w_addr;
int w_offset;
int w_left;
int buf_len;
int buf_off;
unsigned char buf[BER_BUF_SIZE];
} BIO_BER_CTX;
static BIO_METHOD methods_ber=
{
BIO_TYPE_CIPHER,"cipher",
ber_write,
ber_read,
NULL, /* ber_puts, */
NULL, /* ber_gets, */
ber_ctrl,
ber_new,
ber_free,
ber_callback_ctrl,
};
BIO_METHOD *BIO_f_ber(void)
{
return(&methods_ber);
}
static int ber_new(BIO *bi)
{
BIO_BER_CTX *ctx;
ctx=(BIO_BER_CTX *)OPENSSL_malloc(sizeof(BIO_BER_CTX));
if (ctx == NULL) return(0);
memset((char *)ctx,0,sizeof(BIO_BER_CTX));
bi->init=0;
bi->ptr=(char *)ctx;
bi->flags=0;
return(1);
}
static int ber_free(BIO *a)
{
BIO_BER_CTX *b;
if (a == NULL) return(0);
b=(BIO_BER_CTX *)a->ptr;
OPENSSL_cleanse(a->ptr,sizeof(BIO_BER_CTX));
OPENSSL_free(a->ptr);
a->ptr=NULL;
a->init=0;
a->flags=0;
return(1);
}
int bio_ber_get_header(BIO *bio, BIO_BER_CTX *ctx)
{
char buf[64];
int i,j,n;
int ret;
unsigned char *p;
unsigned long length
int tag;
int class;
long max;
BIO_clear_retry_flags(b);
/* Pack the buffer down if there is a hole at the front */
if (ctx->buf_off != 0)
{
p=ctx->buf;
j=ctx->buf_off;
n=ctx->buf_len-j;
for (i=0; i<n; i++)
{
p[0]=p[j];
p++;
}
ctx->buf_len-j;
ctx->buf_off=0;
}
/* If there is more room, read some more data */
i=BER_BUF_SIZE-ctx->buf_len;
if (i)
{
i=BIO_read(bio->next_bio,&(ctx->buf[ctx->buf_len]),i);
if (i <= 0)
{
BIO_copy_next_retry(b);
return(i);
}
else
ctx->buf_len+=i;
}
max=ctx->buf_len;
p=ctx->buf;
ret=ASN1_get_object(&p,&length,&tag,&class,max);
if (ret & 0x80)
{
if ((ctx->buf_len < BER_BUF_SIZE) &&
(ERR_GET_REASON(ERR_peek_error()) == ASN1_R_TOO_LONG))
{
ERR_clear_error(); /* clear the error */
BIO_set_retry_read(b);
}
return(-1);
}
/* We have no error, we have a header, so make use of it */
if ((ctx->tag >= 0) && (ctx->tag != tag))
{
BIOerr(BIO_F_BIO_BER_GET_HEADER,BIO_R_TAG_MISMATCH);
sprintf(buf,"tag=%d, got %d",ctx->tag,tag);
ERR_add_error_data(1,buf);
return(-1);
}
if (ret & 0x01)
if (ret & V_ASN1_CONSTRUCTED)
}
static int ber_read(BIO *b, char *out, int outl)
{
int ret=0,i,n;
BIO_BER_CTX *ctx;
BIO_clear_retry_flags(b);
if (out == NULL) return(0);
ctx=(BIO_BER_CTX *)b->ptr;
if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
if (ctx->finished) return(0);
again:
/* First see if we are half way through reading a block */
if (ctx->num_left > 0)
{
if (ctx->num_left < outl)
n=ctx->num_left;
else
n=outl;
i=BIO_read(b->next_bio,out,n);
if (i <= 0)
{
BIO_copy_next_retry(b);
return(i);
}
ctx->num_left-=i;
outl-=i;
ret+=i;
if (ctx->num_left <= 0)
{
ctx->depth--;
if (ctx->depth <= 0)
ctx->finished=1;
}
if (outl <= 0)
return(ret);
else
goto again;
}
else /* we need to read another BER header */
{
}
}
static int ber_write(BIO *b, char *in, int inl)
{
int ret=0,n,i;
BIO_ENC_CTX *ctx;
ctx=(BIO_ENC_CTX *)b->ptr;
ret=inl;
BIO_clear_retry_flags(b);
n=ctx->buf_len-ctx->buf_off;
while (n > 0)
{
i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
if (i <= 0)
{
BIO_copy_next_retry(b);
return(i);
}
ctx->buf_off+=i;
n-=i;
}
/* at this point all pending data has been written */
if ((in == NULL) || (inl <= 0)) return(0);
ctx->buf_off=0;
while (inl > 0)
{
n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl;
EVP_CipherUpdate(&(ctx->cipher),
(unsigned char *)ctx->buf,&ctx->buf_len,
(unsigned char *)in,n);
inl-=n;
in+=n;
ctx->buf_off=0;
n=ctx->buf_len;
while (n > 0)
{
i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
if (i <= 0)
{
BIO_copy_next_retry(b);
return(i);
}
n-=i;
ctx->buf_off+=i;
}
ctx->buf_len=0;
ctx->buf_off=0;
}
BIO_copy_next_retry(b);
return(ret);
}
static long ber_ctrl(BIO *b, int cmd, long num, char *ptr)
{
BIO *dbio;
BIO_ENC_CTX *ctx,*dctx;
long ret=1;
int i;
ctx=(BIO_ENC_CTX *)b->ptr;
switch (cmd)
{
case BIO_CTRL_RESET:
ctx->ok=1;
ctx->finished=0;
EVP_CipherInit_ex(&(ctx->cipher),NULL,NULL,NULL,NULL,
ctx->cipher.berrypt);
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
case BIO_CTRL_EOF: /* More to read */
if (ctx->cont <= 0)
ret=1;
else
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
case BIO_CTRL_WPENDING:
ret=ctx->buf_len-ctx->buf_off;
if (ret <= 0)
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
case BIO_CTRL_PENDING: /* More to read in buffer */
ret=ctx->buf_len-ctx->buf_off;
if (ret <= 0)
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
case BIO_CTRL_FLUSH:
/* do a final write */
again:
while (ctx->buf_len != ctx->buf_off)
{
i=ber_write(b,NULL,0);
if (i < 0)
{
ret=i;
break;
}
}
if (!ctx->finished)
{
ctx->finished=1;
ctx->buf_off=0;
ret=EVP_CipherFinal_ex(&(ctx->cipher),
(unsigned char *)ctx->buf,
&(ctx->buf_len));
ctx->ok=(int)ret;
if (ret <= 0) break;
/* push out the bytes */
goto again;
}
/* Finally flush the underlying BIO */
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
case BIO_C_GET_CIPHER_STATUS:
ret=(long)ctx->ok;
break;
case BIO_C_DO_STATE_MACHINE:
BIO_clear_retry_flags(b);
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
BIO_copy_next_retry(b);
break;
case BIO_CTRL_DUP:
dbio=(BIO *)ptr;
dctx=(BIO_ENC_CTX *)dbio->ptr;
memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher));
dbio->init=1;
break;
default:
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
}
return(ret);
}
static long ber_callback_ctrl(BIO *b, int cmd, void *(*fp)())
{
long ret=1;
if (b->next_bio == NULL) return(0);
switch (cmd)
{
default:
ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
break;
}
return(ret);
}
/*
void BIO_set_cipher_ctx(b,c)
BIO *b;
EVP_CIPHER_ctx *c;
{
if (b == NULL) return;
if ((b->callback != NULL) &&
(b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
return;
b->init=1;
ctx=(BIO_ENC_CTX *)b->ptr;
memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
if (b->callback != NULL)
b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
}
*/
void BIO_set_cipher(BIO *b, EVP_CIPHER *c, unsigned char *k, unsigned char *i,
int e)
{
BIO_ENC_CTX *ctx;
if (b == NULL) return;
if ((b->callback != NULL) &&
(b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
return;
b->init=1;
ctx=(BIO_ENC_CTX *)b->ptr;
EVP_CipherInit_ex(&(ctx->cipher),c,NULL,k,i,e);
if (b->callback != NULL)
b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
}