/* 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