[thirdparty/openssl.git] / crypto / evp / 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 "evp.h"

#define conv_bin2ascii(a)	(data_bin2ascii[(a)&0x3f])
#define conv_ascii2bin(a)	(data_ascii2bin[(a)&0x7f])

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

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

	*outl=0;
	if (inl == 0) return;
	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(ctx,out,outl)
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(t,f,dlen)
unsigned char *t,*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(ctx)
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(ctx,out,outl,in,inl)
EVP_ENCODE_CTX *ctx;
unsigned char *out;
int *outl;
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))
			{
			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++;
			}

		/* 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;

		if ((v == B64_EOF) || (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);
				if (v < 0) { rv=0; goto end; }
				n=0;
				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(t,f,n)
unsigned char *t,*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(ctx,out,outl)
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(buf,len)
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
Commit	Line	Data
d02b48c6	1	/* crypto/evp/encode.c */
58964a49	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6 RE	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
	59	#include <stdio.h>
	60	#include "cryptlib.h"
	61	#include "evp.h"
	62
	63	#define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
	64	#define conv_ascii2bin(a) (data_ascii2bin[(a)&0x7f])
	65
	66	/* 64 char lines
67	* pad input with 0
68	* left over chars are set to =
69	* 1 byte => xx==
70	* 2 bytes => xxx=
71	* 3 bytes => xxxx
72	*/
73	#define BIN_PER_LINE (64/4*3)
74	#define CHUNKS_PER_LINE (64/4)
75	#define CHAR_PER_LINE (64+1)
76
77	static unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\
78	abcdefghijklmnopqrstuvwxyz0123456789+/";
79
80	/* 0xF0 is a EOLN
81	* 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
82	* 0xF2 is EOF
83	* 0xE0 is ignore at start of line.
84	* 0xFF is error
85	*/
86
87	#define B64_EOLN 0xF0
88	#define B64_CR 0xF1
89	#define B64_EOF 0xF2
90	#define B64_WS 0xE0
91	#define B64_ERROR 0xFF
92	#define B64_NOT_BASE64(a) (((a)\|0x13) == 0xF3)
93
94	static unsigned char data_ascii2bin[128]={
95	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
96	0xFF,0xE0,0xF0,0xFF,0xFF,0xF1,0xFF,0xFF,
97	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
98	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
99	0xE0,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
100	0xFF,0xFF,0xFF,0x3E,0xFF,0xF2,0xFF,0x3F,
101	0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,
102	0x3C,0x3D,0xFF,0xFF,0xFF,0x00,0xFF,0xFF,
103	0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,
104	0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,
105	0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
106	0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF,
107	0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,
108	0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
109	0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,
110	0x31,0x32,0x33,0xFF,0xFF,0xFF,0xFF,0xFF,
111	};
112
113	void EVP_EncodeInit(ctx)
114	EVP_ENCODE_CTX *ctx;
115	{
116	ctx->length=48;
117	ctx->num=0;
118	ctx->line_num=0;
119	}
120
121	void EVP_EncodeUpdate(ctx,out,outl,in,inl)
122	EVP_ENCODE_CTX *ctx;
123	unsigned char *out;
124	int *outl;
125	unsigned char *in;
126	int inl;
127	{
128	int i,j;
129	unsigned int total=0;
130
131	*outl=0;
132	if (inl == 0) return;
133	if ((ctx->num+inl) < ctx->length)
134	{
135	memcpy(&(ctx->enc_data[ctx->num]),in,inl);
136	ctx->num+=inl;
137	return;
138	}
139	if (ctx->num != 0)
140	{
141	i=ctx->length-ctx->num;
142	memcpy(&(ctx->enc_data[ctx->num]),in,i);
143	in+=i;
144	inl-=i;
145	j=EVP_EncodeBlock(out,ctx->enc_data,ctx->length);
146	ctx->num=0;
147	out+=j;
148	*(out++)='\n';
149	*out='\0';
150	total=j+1;
151	}
152	while (inl >= ctx->length)
153	{
154	j=EVP_EncodeBlock(out,in,ctx->length);
155	in+=ctx->length;
156	inl-=ctx->length;
157	out+=j;
158	*(out++)='\n';
159	*out='\0';
160	total+=j+1;
161	}
162	if (inl != 0)
163	memcpy(&(ctx->enc_data[0]),in,inl);
164	ctx->num=inl;
165	*outl=total;
166	}
167
168	void EVP_EncodeFinal(ctx,out,outl)
169	EVP_ENCODE_CTX *ctx;
170	unsigned char *out;
171	int *outl;
172	{
173	unsigned int ret=0;
174
175	if (ctx->num != 0)
176	{
177	ret=EVP_EncodeBlock(out,ctx->enc_data,ctx->num);
178	out[ret++]='\n';
179	out[ret]='\0';
180	ctx->num=0;
181	}
182	*outl=ret;
183	}
184
185	int EVP_EncodeBlock(t,f,dlen)
186	unsigned char t,f;
187	int dlen;
188	{
189	int i,ret=0;
190	unsigned long l;
191
192	for (i=dlen; i > 0; i-=3)
193	{
194	if (i >= 3)
195	{
196	l= (((unsigned long)f[0])<<16L)\|
197	(((unsigned long)f[1])<< 8L)\|f[2];
198	*(t++)=conv_bin2ascii(l>>18L);
199	*(t++)=conv_bin2ascii(l>>12L);
200	*(t++)=conv_bin2ascii(l>> 6L);
201	*(t++)=conv_bin2ascii(l );
202	}
203	else
204	{
205	l=((unsigned long)f[0])<<16L;
206	if (i == 2) l\|=((unsigned long)f[1]<<8L);
207
208	*(t++)=conv_bin2ascii(l>>18L);
209	*(t++)=conv_bin2ascii(l>>12L);
210	*(t++)=(i == 1)?'=':conv_bin2ascii(l>> 6L);
211	*(t++)='=';
212	}
213	ret+=4;
214	f+=3;
215	}
216
217	*t='\0';
218	return(ret);
219	}
220
221	void EVP_DecodeInit(ctx)
222	EVP_ENCODE_CTX *ctx;
223	{
224	ctx->length=30;
225	ctx->num=0;
226	ctx->line_num=0;
58964a49	227	ctx->expect_nl=0;
d02b48c6 RE	228	}
	229
	230	/* -1 for error
	231	* 0 for last line
	232	* 1 for full line
	233	*/
	234	int EVP_DecodeUpdate(ctx,out,outl,in,inl)
	235	EVP_ENCODE_CTX *ctx;
	236	unsigned char *out;
	237	int *outl;
	238	unsigned char *in;
	239	int inl;
	240	{
58964a49	241	int seof= -1,eof=0,rv= -1,ret=0,i,v,tmp,n,ln,tmp2,exp_nl;
d02b48c6 RE	242	unsigned char *d;
	243
	244	n=ctx->num;
	245	d=ctx->enc_data;
	246	ln=ctx->line_num;
58964a49	247	exp_nl=ctx->expect_nl;
d02b48c6 RE	248
	249	/* last line of input. */
	250	if ((inl == 0) \|\| ((n == 0) && (conv_ascii2bin(in[0]) == B64_EOF)))
	251	{ rv=0; goto end; }
	252
	253	/* We parse the input data */
	254	for (i=0; i<inl; i++)
	255	{
	256	/* If the current line is > 80 characters, scream alot */
	257	if (ln >= 80) { rv= -1; goto end; }
	258
	259	/* Get char and put it into the buffer */
	260	tmp= *(in++);
	261	v=conv_ascii2bin(tmp);
	262	/* only save the good data :-) */
	263	if (!B64_NOT_BASE64(v))
	264	{
	265	d[n++]=tmp;
	266	ln++;
	267	}
	268	else if (v == B64_ERROR)
	269	{
	270	rv= -1;
	271	goto end;
	272	}
	273
	274	/* have we seen a '=' which is 'definitly' the last
	275	* input line. seof will point to the character that
	276	* holds it. and eof will hold how many characters to
	277	* chop off. */
	278	if (tmp == '=')
	279	{
	280	if (seof == -1) seof=n;
	281	eof++;
	282	}
	283
	284	/* eoln */
58964a49 RE	285	if (v == B64_EOLN)
	286	{
	287	ln=0;
	288	if (exp_nl)
	289	{
	290	exp_nl=0;
	291	continue;
	292	}
	293	}
	294	exp_nl=0;
d02b48c6 RE	295
	296	/* If we are at the end of input and it looks like a
	297	* line, process it. */
	298	if (((i+1) == inl) && (((n&3) == 0) \|\| eof))
	299	v=B64_EOF;
	300
	301	if ((v == B64_EOF) \|\| (n >= 64))
	302	{
58964a49 RE	303	/* This is needed to work correctly on 64 byte input
	304	* lines. We process the line and then need to
	305	* accept the '\n' */
	306	if ((v != B64_EOF) && (n >= 64)) exp_nl=1;
d02b48c6 RE	307	tmp2=v;
	308	if (n > 0)
	309	{
	310	v=EVP_DecodeBlock(out,d,n);
	311	if (v < 0) { rv=0; goto end; }
	312	n=0;
	313	ret+=(v-eof);
	314	}
	315	else
	316	{
	317	eof=1;
	318	v=0;
	319	}
	320
	321	/* This is the case where we have had a short
	322	* but valid input line */
	323	if ((v < ctx->length) && eof)
	324	{
	325	rv=0;
	326	goto end;
	327	}
	328	else
	329	ctx->length=v;
	330
	331	if (seof >= 0) { rv=0; goto end; }
	332	out+=v;
	333	}
	334	}
	335	rv=1;
	336	end:
	337	*outl=ret;
	338	ctx->num=n;
	339	ctx->line_num=ln;
58964a49	340	ctx->expect_nl=exp_nl;
d02b48c6 RE	341	return(rv);
	342	}
	343
	344	int EVP_DecodeBlock(t,f,n)
	345	unsigned char t,f;
	346	int n;
	347	{
	348	int i,ret=0,a,b,c,d;
	349	unsigned long l;
	350
	351	/* trim white space from the start of the line. */
	352	while ((conv_ascii2bin(*f) == B64_WS) && (n > 0))
	353	{
	354	f++;
	355	n--;
	356	}
	357
	358	/* strip off stuff at the end of the line
	359	* ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
	360	while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n-1]))))
	361	n--;
	362
	363	if (n%4 != 0) return(-1);
	364
	365	for (i=0; i<n; i+=4)
	366	{
	367	a=conv_ascii2bin(*(f++));
	368	b=conv_ascii2bin(*(f++));
	369	c=conv_ascii2bin(*(f++));
	370	d=conv_ascii2bin(*(f++));
	371	if ( (a & 0x80) \|\| (b & 0x80) \|\|
	372	(c & 0x80) \|\| (d & 0x80))
	373	return(-1);
	374	l=( (((unsigned long)a)<<18L)\|
	375	(((unsigned long)b)<<12L)\|
	376	(((unsigned long)c)<< 6L)\|
	377	(((unsigned long)d) ));
	378	*(t++)=(unsigned char)(l>>16L)&0xff;
	379	*(t++)=(unsigned char)(l>> 8L)&0xff;
	380	*(t++)=(unsigned char)(l )&0xff;
	381	ret+=3;
	382	}
	383	return(ret);
	384	}
	385
	386	int EVP_DecodeFinal(ctx,out,outl)
	387	EVP_ENCODE_CTX *ctx;
	388	unsigned char *out;
	389	int *outl;
	390	{
	391	int i;
	392
	393	*outl=0;
	394	if (ctx->num != 0)
	395	{
	396	i=EVP_DecodeBlock(out,ctx->enc_data,ctx->num);
	397	if (i < 0) return(-1);
	398	ctx->num=0;
	399	*outl=i;
	400	return(1);
	401	}
	402	else
	403	return(1);
	404	}
405
406	#ifdef undef
407	int EVP_DecodeValid(buf,len)
408	unsigned char *buf;
409	int len;
410	{
411	int i,num=0,bad=0;
412
413	if (len == 0) return(-1);
414	while (conv_ascii2bin(*buf) == B64_WS)
415	{
416	buf++;
417	len--;
418	if (len == 0) return(-1);
419	}
420
421	for (i=len; i >= 4; i-=4)
422	{
423	if ( (conv_ascii2bin(buf[0]) >= 0x40) \|\|
424	(conv_ascii2bin(buf[1]) >= 0x40) \|\|
425	(conv_ascii2bin(buf[2]) >= 0x40) \|\|
426	(conv_ascii2bin(buf[3]) >= 0x40))
427	return(-1);
428	buf+=4;
429	num+=1+(buf[2] != '=')+(buf[3] != '=');
430	}
431	if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN))
432	return(num);
433	if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) &&
434	(conv_ascii2bin(buf[0]) == B64_EOLN))
435	return(num);
436	return(1);
437	}
438	#endif