/* 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 const 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 const 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,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;
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