/* 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.]

 */

 /*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/evp.h>

#if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

#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)

#ifndef EMULATOR

static unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\

abcdefghijklmnopqrstuvwxyz0123456789+/";

#else

static const unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\

abcdefghijklmnopqrstuvwxyz0123456789+/";

#endif

/* 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)

#ifndef EMULATOR

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,

	};

#else

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,

	};

#endif	

EXPORT_C void EVP_EncodeInit(EVP_ENCODE_CTX *ctx)

	{

	ctx->length=48;

	ctx->num=0;

	ctx->line_num=0;

	}

EXPORT_C 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;

	}

EXPORT_C 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;

	}

EXPORT_C 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);

	}

EXPORT_C 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

 */

EXPORT_C 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);

	}

EXPORT_C 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);

	}

EXPORT_C 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

EXPORT_C 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