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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. */
00076 typedef struct ber_struct
      {
      int tag;
      int class;
      long length;
      int inf;
      int num_left;
      int depth;
      } BER_CTX;

00086 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);
      }


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