crypto/evp/encode.c - platform/external/openssl - Git at Google

 /* 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
	/* 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