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encode.c

/* crypto/evp/encode.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 "cryptlib.h"
#include <openssl/evp.h>

#ifndef CHARSET_EBCDIC
#define conv_bin2ascii(a)     (data_bin2ascii[(a)&0x3f])
#define conv_ascii2bin(a)     (data_ascii2bin[(a)&0x7f])
#else
/* We assume that PEM encoded files are EBCDIC files
 * (i.e., printable text files). Convert them here while decoding.
 * When encoding, output is EBCDIC (text) format again.
 * (No need for conversion in the conv_bin2ascii macro, as the
 * underlying textstring data_bin2ascii[] is already EBCDIC)
 */
#define conv_bin2ascii(a)     (data_bin2ascii[(a)&0x3f])
#define conv_ascii2bin(a)     (data_ascii2bin[os_toascii[a]&0x7f])
#endif

/* 64 char lines
 * pad input with 0
 * left over chars are set to =
 * 1 byte  => xx==
 * 2 bytes => xxx=
 * 3 bytes => xxxx
 */
#define BIN_PER_LINE    (64/4*3)
#define CHUNKS_PER_LINE (64/4)
#define CHAR_PER_LINE   (64+1)

static unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\
abcdefghijklmnopqrstuvwxyz0123456789+/";

/* 0xF0 is a EOLN
 * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
 * 0xF2 is EOF
 * 0xE0 is ignore at start of line.
 * 0xFF is error
 */

#define B64_EOLN        0xF0
#define B64_CR                0xF1
#define B64_EOF               0xF2
#define B64_WS                0xE0
#define B64_ERROR             0xFF
#define B64_NOT_BASE64(a)     (((a)|0x13) == 0xF3)

static unsigned char data_ascii2bin[128]={
      0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
      0xFF,0xE0,0xF0,0xFF,0xFF,0xF1,0xFF,0xFF,
      0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
      0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
      0xE0,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
      0xFF,0xFF,0xFF,0x3E,0xFF,0xF2,0xFF,0x3F,
      0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,
      0x3C,0x3D,0xFF,0xFF,0xFF,0x00,0xFF,0xFF,
      0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,
      0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,
      0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
      0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF,
      0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,
      0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
      0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,
      0x31,0x32,0x33,0xFF,0xFF,0xFF,0xFF,0xFF,
      };

void EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
      {
      ctx->length=48;
      ctx->num=0;
      ctx->line_num=0;
      }

void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
           const unsigned char *in, int inl)
      {
      int i,j;
      unsigned int total=0;

      *outl=0;
      if (inl == 0) return;
      OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
      if ((ctx->num+inl) < ctx->length)
            {
            memcpy(&(ctx->enc_data[ctx->num]),in,inl);
            ctx->num+=inl;
            return;
            }
      if (ctx->num != 0)
            {
            i=ctx->length-ctx->num;
            memcpy(&(ctx->enc_data[ctx->num]),in,i);
            in+=i;
            inl-=i;
            j=EVP_EncodeBlock(out,ctx->enc_data,ctx->length);
            ctx->num=0;
            out+=j;
            *(out++)='\n';
            *out='\0';
            total=j+1;
            }
      while (inl >= ctx->length)
            {
            j=EVP_EncodeBlock(out,in,ctx->length);
            in+=ctx->length;
            inl-=ctx->length;
            out+=j;
            *(out++)='\n';
            *out='\0';
            total+=j+1;
            }
      if (inl != 0)
            memcpy(&(ctx->enc_data[0]),in,inl);
      ctx->num=inl;
      *outl=total;
      }

void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
      {
      unsigned int ret=0;

      if (ctx->num != 0)
            {
            ret=EVP_EncodeBlock(out,ctx->enc_data,ctx->num);
            out[ret++]='\n';
            out[ret]='\0';
            ctx->num=0;
            }
      *outl=ret;
      }

int EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
      {
      int i,ret=0;
      unsigned long l;

      for (i=dlen; i > 0; i-=3)
            {
            if (i >= 3)
                  {
                  l=    (((unsigned long)f[0])<<16L)|
                        (((unsigned long)f[1])<< 8L)|f[2];
                  *(t++)=conv_bin2ascii(l>>18L);
                  *(t++)=conv_bin2ascii(l>>12L);
                  *(t++)=conv_bin2ascii(l>> 6L);
                  *(t++)=conv_bin2ascii(l     );
                  }
            else
                  {
                  l=((unsigned long)f[0])<<16L;
                  if (i == 2) l|=((unsigned long)f[1]<<8L);

                  *(t++)=conv_bin2ascii(l>>18L);
                  *(t++)=conv_bin2ascii(l>>12L);
                  *(t++)=(i == 1)?'=':conv_bin2ascii(l>> 6L);
                  *(t++)='=';
                  }
            ret+=4;
            f+=3;
            }

      *t='\0';
      return(ret);
      }

void EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
      {
      ctx->length=30;
      ctx->num=0;
      ctx->line_num=0;
      ctx->expect_nl=0;
      }

/* -1 for error
 *  0 for last line
 *  1 for full line
 */
int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
           const unsigned char *in, int inl)
      {
      int seof= -1,eof=0,rv= -1,ret=0,i,v,tmp,n,ln,tmp2,exp_nl;
      unsigned char *d;

      n=ctx->num;
      d=ctx->enc_data;
      ln=ctx->line_num;
      exp_nl=ctx->expect_nl;

      /* last line of input. */
      if ((inl == 0) || ((n == 0) && (conv_ascii2bin(in[0]) == B64_EOF)))
            { rv=0; goto end; }
            
      /* We parse the input data */
      for (i=0; i<inl; i++)
            {
            /* If the current line is > 80 characters, scream alot */
            if (ln >= 80) { rv= -1; goto end; }

            /* Get char and put it into the buffer */
            tmp= *(in++);
            v=conv_ascii2bin(tmp);
            /* only save the good data :-) */
            if (!B64_NOT_BASE64(v))
                  {
                  OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
                  d[n++]=tmp;
                  ln++;
                  }
            else if (v == B64_ERROR)
                  {
                  rv= -1;
                  goto end;
                  }

            /* have we seen a '=' which is 'definitly' the last
             * input line.  seof will point to the character that
             * holds it. and eof will hold how many characters to
             * chop off. */
            if (tmp == '=')
                  {
                  if (seof == -1) seof=n;
                  eof++;
                  }

            if (v == B64_CR)
                  {
                  ln = 0;
                  if (exp_nl)
                        continue;
                  }

            /* eoln */
            if (v == B64_EOLN)
                  {
                  ln=0;
                  if (exp_nl)
                        {
                        exp_nl=0;
                        continue;
                        }
                  }
            exp_nl=0;

            /* If we are at the end of input and it looks like a
             * line, process it. */
            if (((i+1) == inl) && (((n&3) == 0) || eof))
                  {
                  v=B64_EOF;
                  /* In case things were given us in really small
                     records (so two '=' were given in separate
                     updates), eof may contain the incorrect number
                     of ending bytes to skip, so let's redo the count */
                  eof = 0;
                  if (d[n-1] == '=') eof++;
                  if (d[n-2] == '=') eof++;
                  /* There will never be more than two '=' */
                  }

            if ((v == B64_EOF && (n&3) == 0) || (n >= 64))
                  {
                  /* This is needed to work correctly on 64 byte input
                   * lines.  We process the line and then need to
                   * accept the '\n' */
                  if ((v != B64_EOF) && (n >= 64)) exp_nl=1;
                  tmp2=v;
                  if (n > 0)
                        {
                        v=EVP_DecodeBlock(out,d,n);
                        n=0;
                        if (v < 0) { rv=0; goto end; }
                        ret+=(v-eof);
                        }
                  else
                        {
                        eof=1;
                        v=0;
                        }

                  /* This is the case where we have had a short
                   * but valid input line */
                  if ((v < ctx->length) && eof)
                        {
                        rv=0;
                        goto end;
                        }
                  else
                        ctx->length=v;

                  if (seof >= 0) { rv=0; goto end; }
                  out+=v;
                  }
            }
      rv=1;
end:
      *outl=ret;
      ctx->num=n;
      ctx->line_num=ln;
      ctx->expect_nl=exp_nl;
      return(rv);
      }

int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
      {
      int i,ret=0,a,b,c,d;
      unsigned long l;

      /* trim white space from the start of the line. */
      while ((conv_ascii2bin(*f) == B64_WS) && (n > 0))
            {
            f++;
            n--;
            }

      /* strip off stuff at the end of the line
       * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
      while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n-1]))))
            n--;

      if (n%4 != 0) return(-1);

      for (i=0; i<n; i+=4)
            {
            a=conv_ascii2bin(*(f++));
            b=conv_ascii2bin(*(f++));
            c=conv_ascii2bin(*(f++));
            d=conv_ascii2bin(*(f++));
            if (  (a & 0x80) || (b & 0x80) ||
                  (c & 0x80) || (d & 0x80))
                  return(-1);
            l=(   (((unsigned long)a)<<18L)|
                  (((unsigned long)b)<<12L)|
                  (((unsigned long)c)<< 6L)|
                  (((unsigned long)d)     ));
            *(t++)=(unsigned char)(l>>16L)&0xff;
            *(t++)=(unsigned char)(l>> 8L)&0xff;
            *(t++)=(unsigned char)(l     )&0xff;
            ret+=3;
            }
      return(ret);
      }

int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
      {
      int i;

      *outl=0;
      if (ctx->num != 0)
            {
            i=EVP_DecodeBlock(out,ctx->enc_data,ctx->num);
            if (i < 0) return(-1);
            ctx->num=0;
            *outl=i;
            return(1);
            }
      else
            return(1);
      }

#ifdef undef
int EVP_DecodeValid(unsigned char *buf, int len)
      {
      int i,num=0,bad=0;

      if (len == 0) return(-1);
      while (conv_ascii2bin(*buf) == B64_WS)
            {
            buf++;
            len--;
            if (len == 0) return(-1);
            }

      for (i=len; i >= 4; i-=4)
            {
            if (  (conv_ascii2bin(buf[0]) >= 0x40) ||
                  (conv_ascii2bin(buf[1]) >= 0x40) ||
                  (conv_ascii2bin(buf[2]) >= 0x40) ||
                  (conv_ascii2bin(buf[3]) >= 0x40))
                  return(-1);
            buf+=4;
            num+=1+(buf[2] != '=')+(buf[3] != '=');
            }
      if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN))
            return(num);
      if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) &&
            (conv_ascii2bin(buf[0]) == B64_EOLN))
            return(num);
      return(1);
      }
#endif

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