[thirdparty/openssl.git] / crypto / evp / bio_enc.c

/* crypto/evp/bio_enc.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 <errno.h>
#include "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/evp.h>

static int enc_write(BIO *h, const char *buf, int num);
static int enc_read(BIO *h, char *buf, int size);
/*static int enc_puts(BIO *h, const char *str); */
/*static int enc_gets(BIO *h, char *str, int size); */
static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int enc_new(BIO *h);
static int enc_free(BIO *data);
static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps);
#define ENC_BLOCK_SIZE	(1024*4)

typedef struct enc_struct
	{
	int buf_len;
	int buf_off;
	int cont;		/* <= 0 when finished */
	int finished;
	int ok;			/* bad decrypt */
	EVP_CIPHER_CTX cipher;
	char buf[ENC_BLOCK_SIZE+10];
	} BIO_ENC_CTX;

static BIO_METHOD methods_enc=
	{
	BIO_TYPE_CIPHER,"cipher",
	enc_write,
	enc_read,
	NULL, /* enc_puts, */
	NULL, /* enc_gets, */
	enc_ctrl,
	enc_new,
	enc_free,
	enc_callback_ctrl,
	};

BIO_METHOD *BIO_f_cipher(void)
	{
	return(&methods_enc);
	}

static int enc_new(BIO *bi)
	{
	BIO_ENC_CTX *ctx;

	ctx=(BIO_ENC_CTX *)OPENSSL_malloc(sizeof(BIO_ENC_CTX));
	EVP_CIPHER_CTX_init(&ctx->cipher);
	if (ctx == NULL) return(0);

	ctx->buf_len=0;
	ctx->buf_off=0;
	ctx->cont=1;
	ctx->finished=0;
	ctx->ok=1;

	bi->init=0;
	bi->ptr=(char *)ctx;
	bi->flags=0;
	return(1);
	}

static int enc_free(BIO *a)
	{
	BIO_ENC_CTX *b;

	if (a == NULL) return(0);
	b=(BIO_ENC_CTX *)a->ptr;
	EVP_CIPHER_CTX_cleanup(&(b->cipher));
	memset(a->ptr,0,sizeof(BIO_ENC_CTX));
	OPENSSL_free(a->ptr);
	a->ptr=NULL;
	a->init=0;
	a->flags=0;
	return(1);
	}
	
static int enc_read(BIO *b, char *out, int outl)
	{
	int ret=0,i;
	BIO_ENC_CTX *ctx;

	if (out == NULL) return(0);
	ctx=(BIO_ENC_CTX *)b->ptr;

	if ((ctx == NULL) || (b->next_bio == NULL)) return(0);

	/* First check if there are bytes decoded/encoded */
	if (ctx->buf_len > 0)
		{
		i=ctx->buf_len-ctx->buf_off;
		if (i > outl) i=outl;
		memcpy(out,&(ctx->buf[ctx->buf_off]),i);
		ret=i;
		out+=i;
		outl-=i;
		ctx->buf_off+=i;
		if (ctx->buf_len == ctx->buf_off)
			{
			ctx->buf_len=0;
			ctx->buf_off=0;
			}
		}

	/* At this point, we have room of outl bytes and an empty
	 * buffer, so we should read in some more. */

	while (outl > 0)
		{
		if (ctx->cont <= 0) break;

		/* read in at offset 8, read the EVP_Cipher
		 * documentation about why */
		i=BIO_read(b->next_bio,&(ctx->buf[8]),ENC_BLOCK_SIZE);

		if (i <= 0)
			{
			/* Should be continue next time we are called? */
			if (!BIO_should_retry(b->next_bio))
				{
				ctx->cont=i;
				i=EVP_CipherFinal(&(ctx->cipher),
					(unsigned char *)ctx->buf,
					&(ctx->buf_len));
				ctx->ok=i;
				ctx->buf_off=0;
				}
			else 
				{
				ret=(ret == 0)?i:ret;
				break;
				}
			}
		else
			{
			EVP_CipherUpdate(&(ctx->cipher),
				(unsigned char *)ctx->buf,&ctx->buf_len,
				(unsigned char *)&(ctx->buf[8]),i);
			ctx->cont=1;
			/* Note: it is possible for EVP_CipherUpdate to
			 * decrypt zero bytes because this is or looks like
			 * the final block: if this happens we should retry
			 * and either read more data or decrypt the final
			 * block
			 */
			if(ctx->buf_len == 0) continue;
			}

		if (ctx->buf_len <= outl)
			i=ctx->buf_len;
		else
			i=outl;
		if (i <= 0) break;
		memcpy(out,ctx->buf,i);
		ret+=i;
		ctx->buf_off=i;
		outl-=i;
		out+=i;
		}

	BIO_clear_retry_flags(b);
	BIO_copy_next_retry(b);
	return((ret == 0)?ctx->cont:ret);
	}

static int enc_write(BIO *b, const char *in, int inl)
	{
	int ret=0,n,i;
	BIO_ENC_CTX *ctx;

	ctx=(BIO_ENC_CTX *)b->ptr;
	ret=inl;

	BIO_clear_retry_flags(b);
	n=ctx->buf_len-ctx->buf_off;
	while (n > 0)
		{
		i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
		if (i <= 0)
			{
			BIO_copy_next_retry(b);
			return(i);
			}
		ctx->buf_off+=i;
		n-=i;
		}
	/* at this point all pending data has been written */

	if ((in == NULL) || (inl <= 0)) return(0);

	ctx->buf_off=0;
	while (inl > 0)
		{
		n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl;
		EVP_CipherUpdate(&(ctx->cipher),
			(unsigned char *)ctx->buf,&ctx->buf_len,
			(unsigned char *)in,n);
		inl-=n;
		in+=n;

		ctx->buf_off=0;
		n=ctx->buf_len;
		while (n > 0)
			{
			i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
			if (i <= 0)
				{
				BIO_copy_next_retry(b);
				return(i);
				}
			n-=i;
			ctx->buf_off+=i;
			}
		ctx->buf_len=0;
		ctx->buf_off=0;
		}
	BIO_copy_next_retry(b);
	return(ret);
	}

static long enc_ctrl(BIO *b, int cmd, long num, void *ptr)
	{
	BIO *dbio;
	BIO_ENC_CTX *ctx,*dctx;
	long ret=1;
	int i;
	EVP_CIPHER_CTX **c_ctx;

	ctx=(BIO_ENC_CTX *)b->ptr;

	switch (cmd)
		{
	case BIO_CTRL_RESET:
		ctx->ok=1;
		ctx->finished=0;
		EVP_CipherInit(&(ctx->cipher),NULL,NULL,NULL,
			ctx->cipher.encrypt);
		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
		break;
	case BIO_CTRL_EOF:	/* More to read */
		if (ctx->cont <= 0)
			ret=1;
		else
			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
		break;
	case BIO_CTRL_WPENDING:
		ret=ctx->buf_len-ctx->buf_off;
		if (ret <= 0)
			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
		break;
	case BIO_CTRL_PENDING: /* More to read in buffer */
		ret=ctx->buf_len-ctx->buf_off;
		if (ret <= 0)
			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
		break;
	case BIO_CTRL_FLUSH:
		/* do a final write */
again:
		while (ctx->buf_len != ctx->buf_off)
			{
			i=enc_write(b,NULL,0);
			if (i < 0)
				{
				ret=i;
				break;
				}
			}

		if (!ctx->finished)
			{
			ctx->finished=1;
			ctx->buf_off=0;
			ret=EVP_CipherFinal(&(ctx->cipher),
				(unsigned char *)ctx->buf,
				&(ctx->buf_len));
			ctx->ok=(int)ret;
			if (ret <= 0) break;

			/* push out the bytes */
			goto again;
			}
		
		/* Finally flush the underlying BIO */
		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
		break;
	case BIO_C_GET_CIPHER_STATUS:
		ret=(long)ctx->ok;
		break;
	case BIO_C_DO_STATE_MACHINE:
		BIO_clear_retry_flags(b);
		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
		BIO_copy_next_retry(b);
		break;
	case BIO_C_GET_CIPHER_CTX:
		c_ctx=(EVP_CIPHER_CTX **)ptr;
		(*c_ctx)= &(ctx->cipher);
		b->init=1;
		break;
	case BIO_CTRL_DUP:
		dbio=(BIO *)ptr;
		dctx=(BIO_ENC_CTX *)dbio->ptr;
		memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher));
		dbio->init=1;
		break;
	default:
		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
		break;
		}
	return(ret);
	}

static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
	{
	long ret=1;

	if (b->next_bio == NULL) return(0);
	switch (cmd)
		{
	default:
		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
		break;
		}
	return(ret);
	}

/*
void BIO_set_cipher_ctx(b,c)
BIO *b;
EVP_CIPHER_ctx *c;
	{
	if (b == NULL) return;

	if ((b->callback != NULL) &&
		(b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
		return;

	b->init=1;
	ctx=(BIO_ENC_CTX *)b->ptr;
	memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
	
	if (b->callback != NULL)
		b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
	}
*/

void BIO_set_cipher(BIO *b, const EVP_CIPHER *c, unsigned char *k,
	     unsigned char *i, int e)
	{
	BIO_ENC_CTX *ctx;

	if (b == NULL) return;

	if ((b->callback != NULL) &&
		(b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,0L) <= 0))
		return;

	b->init=1;
	ctx=(BIO_ENC_CTX *)b->ptr;
	EVP_CipherInit(&(ctx->cipher),c,k,i,e);
	
	if (b->callback != NULL)
		b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,1L);
	}
Commit	Line	Data
d02b48c6	1	/* crypto/evp/bio_enc.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 <errno.h>
	61	#include "cryptlib.h"
ec577822 BM	62	#include <openssl/buffer.h>
ec577822 BM	63	#include <openssl/evp.h>
d02b48c6	64
0e1c0612 UM	65	static int enc_write(BIO h, const char buf, int num);
	66	static int enc_read(BIO h, char buf, int size);
	67	/static int enc_puts(BIO h, const char str); /
	68	/static int enc_gets(BIO h, char str, int size); /
	69	static long enc_ctrl(BIO h, int cmd, long arg1, void arg2);
d02b48c6 RE	70	static int enc_new(BIO *h);
d02b48c6 RE	71	static int enc_free(BIO *data);
13083215	72	static long enc_callback_ctrl(BIO h, int cmd, bio_info_cb fps);
d02b48c6 RE	73	#define ENC_BLOCK_SIZE (1024*4)
	74
	75	typedef struct enc_struct
	76	{
	77	int buf_len;
	78	int buf_off;
	79	int cont; /* <= 0 when finished */
	80	int finished;
	81	int ok; /* bad decrypt */
	82	EVP_CIPHER_CTX cipher;
	83	char buf[ENC_BLOCK_SIZE+10];
	84	} BIO_ENC_CTX;
	85
	86	static BIO_METHOD methods_enc=
	87	{
	88	BIO_TYPE_CIPHER,"cipher",
	89	enc_write,
	90	enc_read,
	91	NULL, /* enc_puts, */
	92	NULL, /* enc_gets, */
	93	enc_ctrl,
	94	enc_new,
	95	enc_free,
d3442bc7	96	enc_callback_ctrl,
d02b48c6 RE	97	};
d02b48c6 RE	98
6b691a5c	99	BIO_METHOD *BIO_f_cipher(void)
d02b48c6 RE	100	{
	101	return(&methods_enc);
	102	}
	103
6b691a5c	104	static int enc_new(BIO *bi)
d02b48c6 RE	105	{
	106	BIO_ENC_CTX *ctx;
	107
26a3a48d	108	ctx=(BIO_ENC_CTX *)OPENSSL_malloc(sizeof(BIO_ENC_CTX));
58964a49	109	EVP_CIPHER_CTX_init(&ctx->cipher);
d02b48c6 RE	110	if (ctx == NULL) return(0);
	111
	112	ctx->buf_len=0;
	113	ctx->buf_off=0;
	114	ctx->cont=1;
	115	ctx->finished=0;
	116	ctx->ok=1;
	117
	118	bi->init=0;
	119	bi->ptr=(char *)ctx;
	120	bi->flags=0;
	121	return(1);
	122	}
	123
6b691a5c	124	static int enc_free(BIO *a)
d02b48c6 RE	125	{
	126	BIO_ENC_CTX *b;
	127
	128	if (a == NULL) return(0);
	129	b=(BIO_ENC_CTX *)a->ptr;
	130	EVP_CIPHER_CTX_cleanup(&(b->cipher));
	131	memset(a->ptr,0,sizeof(BIO_ENC_CTX));
26a3a48d	132	OPENSSL_free(a->ptr);
d02b48c6 RE	133	a->ptr=NULL;
	134	a->init=0;
	135	a->flags=0;
	136	return(1);
	137	}
	138
6b691a5c	139	static int enc_read(BIO b, char out, int outl)
d02b48c6 RE	140	{
	141	int ret=0,i;
	142	BIO_ENC_CTX *ctx;
	143
	144	if (out == NULL) return(0);
	145	ctx=(BIO_ENC_CTX *)b->ptr;
	146
	147	if ((ctx == NULL) \|\| (b->next_bio == NULL)) return(0);
	148
	149	/* First check if there are bytes decoded/encoded */
	150	if (ctx->buf_len > 0)
	151	{
	152	i=ctx->buf_len-ctx->buf_off;
	153	if (i > outl) i=outl;
	154	memcpy(out,&(ctx->buf[ctx->buf_off]),i);
	155	ret=i;
	156	out+=i;
	157	outl-=i;
	158	ctx->buf_off+=i;
	159	if (ctx->buf_len == ctx->buf_off)
	160	{
	161	ctx->buf_len=0;
	162	ctx->buf_off=0;
	163	}
	164	}
	165
	166	/* At this point, we have room of outl bytes and an empty
	167	* buffer, so we should read in some more. */
	168
	169	while (outl > 0)
	170	{
	171	if (ctx->cont <= 0) break;
	172
	173	/* read in at offset 8, read the EVP_Cipher
	174	* documentation about why */
	175	i=BIO_read(b->next_bio,&(ctx->buf[8]),ENC_BLOCK_SIZE);
	176
	177	if (i <= 0)
	178	{
	179	/* Should be continue next time we are called? */
	180	if (!BIO_should_retry(b->next_bio))
	181	{
	182	ctx->cont=i;
	183	i=EVP_CipherFinal(&(ctx->cipher),
	184	(unsigned char *)ctx->buf,
	185	&(ctx->buf_len));
	186	ctx->ok=i;
	187	ctx->buf_off=0;
	188	}
7b65c329 DSH	189	else
7b65c329 DSH	190	{
d02b48c6	191	ret=(ret == 0)?i:ret;
7b65c329 DSH	192	break;
7b65c329 DSH	193	}
d02b48c6 RE	194	}
	195	else
	196	{
	197	EVP_CipherUpdate(&(ctx->cipher),
	198	(unsigned char *)ctx->buf,&ctx->buf_len,
	199	(unsigned char *)&(ctx->buf[8]),i);
	200	ctx->cont=1;
7b65c329 DSH	201	/* Note: it is possible for EVP_CipherUpdate to
	202	* decrypt zero bytes because this is or looks like
	203	* the final block: if this happens we should retry
	204	* and either read more data or decrypt the final
	205	* block
	206	*/
	207	if(ctx->buf_len == 0) continue;
d02b48c6 RE	208	}
	209
	210	if (ctx->buf_len <= outl)
	211	i=ctx->buf_len;
	212	else
	213	i=outl;
d02b48c6 RE	214	if (i <= 0) break;
	215	memcpy(out,ctx->buf,i);
	216	ret+=i;
	217	ctx->buf_off=i;
	218	outl-=i;
	219	out+=i;
	220	}
	221
	222	BIO_clear_retry_flags(b);
	223	BIO_copy_next_retry(b);
	224	return((ret == 0)?ctx->cont:ret);
	225	}
	226
0e1c0612	227	static int enc_write(BIO b, const char in, int inl)
d02b48c6 RE	228	{
	229	int ret=0,n,i;
	230	BIO_ENC_CTX *ctx;
	231
	232	ctx=(BIO_ENC_CTX *)b->ptr;
	233	ret=inl;
	234
	235	BIO_clear_retry_flags(b);
	236	n=ctx->buf_len-ctx->buf_off;
	237	while (n > 0)
	238	{
	239	i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
	240	if (i <= 0)
	241	{
	242	BIO_copy_next_retry(b);
	243	return(i);
	244	}
	245	ctx->buf_off+=i;
	246	n-=i;
	247	}
	248	/* at this point all pending data has been written */
	249
	250	if ((in == NULL) \|\| (inl <= 0)) return(0);
	251
	252	ctx->buf_off=0;
	253	while (inl > 0)
	254	{
	255	n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl;
	256	EVP_CipherUpdate(&(ctx->cipher),
	257	(unsigned char *)ctx->buf,&ctx->buf_len,
	258	(unsigned char *)in,n);
	259	inl-=n;
	260	in+=n;
	261
	262	ctx->buf_off=0;
	263	n=ctx->buf_len;
	264	while (n > 0)
	265	{
	266	i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
	267	if (i <= 0)
	268	{
	269	BIO_copy_next_retry(b);
	270	return(i);
	271	}
	272	n-=i;
	273	ctx->buf_off+=i;
	274	}
	275	ctx->buf_len=0;
	276	ctx->buf_off=0;
	277	}
	278	BIO_copy_next_retry(b);
	279	return(ret);
	280	}
	281
0e1c0612	282	static long enc_ctrl(BIO b, int cmd, long num, void ptr)
d02b48c6 RE	283	{
	284	BIO *dbio;
	285	BIO_ENC_CTX ctx,dctx;
	286	long ret=1;
	287	int i;
dfeab068	288	EVP_CIPHER_CTX **c_ctx;
d02b48c6 RE	289
	290	ctx=(BIO_ENC_CTX *)b->ptr;
	291
	292	switch (cmd)
	293	{
	294	case BIO_CTRL_RESET:
	295	ctx->ok=1;
	296	ctx->finished=0;
	297	EVP_CipherInit(&(ctx->cipher),NULL,NULL,NULL,
	298	ctx->cipher.encrypt);
	299	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	300	break;
	301	case BIO_CTRL_EOF: /* More to read */
	302	if (ctx->cont <= 0)
	303	ret=1;
	304	else
	305	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	306	break;
	307	case BIO_CTRL_WPENDING:
	308	ret=ctx->buf_len-ctx->buf_off;
	309	if (ret <= 0)
	310	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	311	break;
	312	case BIO_CTRL_PENDING: /* More to read in buffer */
	313	ret=ctx->buf_len-ctx->buf_off;
	314	if (ret <= 0)
	315	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	316	break;
	317	case BIO_CTRL_FLUSH:
	318	/* do a final write */
	319	again:
	320	while (ctx->buf_len != ctx->buf_off)
	321	{
	322	i=enc_write(b,NULL,0);
	323	if (i < 0)
	324	{
	325	ret=i;
	326	break;
	327	}
	328	}
	329
	330	if (!ctx->finished)
	331	{
	332	ctx->finished=1;
	333	ctx->buf_off=0;
	334	ret=EVP_CipherFinal(&(ctx->cipher),
	335	(unsigned char *)ctx->buf,
	336	&(ctx->buf_len));
	337	ctx->ok=(int)ret;
	338	if (ret <= 0) break;
	339
	340	/* push out the bytes */
	341	goto again;
	342	}
	343
	344	/* Finally flush the underlying BIO */
	345	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	346	break;
	347	case BIO_C_GET_CIPHER_STATUS:
	348	ret=(long)ctx->ok;
	349	break;
	350	case BIO_C_DO_STATE_MACHINE:
	351	BIO_clear_retry_flags(b);
	352	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
353	BIO_copy_next_retry(b);
354	break;
dfeab068 RE	355	case BIO_C_GET_CIPHER_CTX:
	356	c_ctx=(EVP_CIPHER_CTX **)ptr;
	357	(*c_ctx)= &(ctx->cipher);
	358	b->init=1;
	359	break;
d02b48c6 RE	360	case BIO_CTRL_DUP:
	361	dbio=(BIO *)ptr;
	362	dctx=(BIO_ENC_CTX *)dbio->ptr;
	363	memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher));
	364	dbio->init=1;
	365	break;
	366	default:
	367	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	368	break;
	369	}
	370	return(ret);
	371	}
	372
13083215	373	static long enc_callback_ctrl(BIO b, int cmd, bio_info_cb fp)
d3442bc7 RL	374	{
	375	long ret=1;
	376
	377	if (b->next_bio == NULL) return(0);
	378	switch (cmd)
	379	{
	380	default:
	381	ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
	382	break;
	383	}
	384	return(ret);
	385	}
	386
58964a49 RE	387	/*
	388	void BIO_set_cipher_ctx(b,c)
	389	BIO *b;
	390	EVP_CIPHER_ctx *c;
	391	{
	392	if (b == NULL) return;
	393
	394	if ((b->callback != NULL) &&
	395	(b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
	396	return;
	397
	398	b->init=1;
	399	ctx=(BIO_ENC_CTX *)b->ptr;
	400	memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
	401
	402	if (b->callback != NULL)
	403	b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
	404	}
	405	*/
	406
6b691a5c UM	407	void BIO_set_cipher(BIO b, const EVP_CIPHER c, unsigned char *k,
6b691a5c UM	408	unsigned char *i, int e)
d02b48c6 RE	409	{
	410	BIO_ENC_CTX *ctx;
	411
	412	if (b == NULL) return;
	413
	414	if ((b->callback != NULL) &&
e778802f	415	(b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,0L) <= 0))
d02b48c6 RE	416	return;
	417
	418	b->init=1;
	419	ctx=(BIO_ENC_CTX *)b->ptr;
	420	EVP_CipherInit(&(ctx->cipher),c,k,i,e);
	421
	422	if (b->callback != NULL)
e778802f	423	b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,1L);
d02b48c6 RE	424	}
d02b48c6 RE	425