[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)
#define BUF_OFFSET	(EVP_MAX_BLOCK_LENGTH*2)

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;
	/* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate
	 * can return up to a block more data than is presented to it
	 */
	char buf[ENC_BLOCK_SIZE+BUF_OFFSET+2];
	} 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));
	if (ctx == NULL) return(0);
	EVP_CIPHER_CTX_init(&ctx->cipher);

	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));
	OPENSSL_cleanse(a->ptr,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 IV offset, read the EVP_Cipher
		 * documentation about why */
		i=BIO_read(b->next_bio,&(ctx->buf[BUF_OFFSET]),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_ex(&(ctx->cipher),
					(unsigned char *)ctx->buf,
					&(ctx->buf_len));
				ctx->ok=i;
				ctx->buf_off=0;
				}
			else 
				{
				ret=(ret == 0)?i:ret;
				break;
				}
			}
		else
			{
			if (!EVP_CipherUpdate(&(ctx->cipher),
				(unsigned char *)ctx->buf,&ctx->buf_len,
				(unsigned char *)&(ctx->buf[BUF_OFFSET]),i))
				{
				BIO_clear_retry_flags(b);
				return 0;
				}	
			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;
		if (!EVP_CipherUpdate(&(ctx->cipher),
			(unsigned char *)ctx->buf,&ctx->buf_len,
			(unsigned char *)in,n))
			{
			BIO_clear_retry_flags(b);
			return 0;
			}
		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 (ret == inl) ? i : ret - inl;
				}
			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;
		if (!EVP_CipherInit_ex(&(ctx->cipher),NULL,NULL,NULL,NULL,
			ctx->cipher.encrypt))
			return 0;
		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)
				return i;
			}

		if (!ctx->finished)
			{
			ctx->finished=1;
			ctx->buf_off=0;
			ret=EVP_CipherFinal_ex(&(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;
		EVP_CIPHER_CTX_init(&dctx->cipher);
		ret = EVP_CIPHER_CTX_copy(&dctx->cipher,&ctx->cipher);
		if (ret)
			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);
	}
*/

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

	if (b == NULL) return 0;

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

	b->init=1;
	ctx=(BIO_ENC_CTX *)b->ptr;
	if (!EVP_CipherInit_ex(&(ctx->cipher),c,NULL, k,i,e))
		return 0;
	
	if (b->callback != NULL)
		return b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,1L);
	return 1;
	}
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	73	#define ENC_BLOCK_SIZE (1024*4)
a93b01be	74	#define BUF_OFFSET (EVP_MAX_BLOCK_LENGTH*2)
d02b48c6 RE	75
	76	typedef struct enc_struct
	77	{
	78	int buf_len;
	79	int buf_off;
	80	int cont; /* <= 0 when finished */
	81	int finished;
	82	int ok; /* bad decrypt */
	83	EVP_CIPHER_CTX cipher;
1a095560 DSH	84	/* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate
	85	* can return up to a block more data than is presented to it
	86	*/
	87	char buf[ENC_BLOCK_SIZE+BUF_OFFSET+2];
d02b48c6 RE	88	} BIO_ENC_CTX;
	89
	90	static BIO_METHOD methods_enc=
	91	{
	92	BIO_TYPE_CIPHER,"cipher",
	93	enc_write,
	94	enc_read,
	95	NULL, /* enc_puts, */
	96	NULL, /* enc_gets, */
	97	enc_ctrl,
	98	enc_new,
	99	enc_free,
d3442bc7	100	enc_callback_ctrl,
d02b48c6 RE	101	};
d02b48c6 RE	102
6b691a5c	103	BIO_METHOD *BIO_f_cipher(void)
d02b48c6 RE	104	{
	105	return(&methods_enc);
	106	}
	107
6b691a5c	108	static int enc_new(BIO *bi)
d02b48c6 RE	109	{
	110	BIO_ENC_CTX *ctx;
	111
26a3a48d	112	ctx=(BIO_ENC_CTX *)OPENSSL_malloc(sizeof(BIO_ENC_CTX));
d02b48c6	113	if (ctx == NULL) return(0);
9cdf87f1	114	EVP_CIPHER_CTX_init(&ctx->cipher);
d02b48c6 RE	115
	116	ctx->buf_len=0;
	117	ctx->buf_off=0;
	118	ctx->cont=1;
	119	ctx->finished=0;
	120	ctx->ok=1;
	121
	122	bi->init=0;
	123	bi->ptr=(char *)ctx;
	124	bi->flags=0;
	125	return(1);
	126	}
	127
6b691a5c	128	static int enc_free(BIO *a)
d02b48c6 RE	129	{
	130	BIO_ENC_CTX *b;
	131
	132	if (a == NULL) return(0);
	133	b=(BIO_ENC_CTX *)a->ptr;
	134	EVP_CIPHER_CTX_cleanup(&(b->cipher));
4579924b	135	OPENSSL_cleanse(a->ptr,sizeof(BIO_ENC_CTX));
26a3a48d	136	OPENSSL_free(a->ptr);
d02b48c6 RE	137	a->ptr=NULL;
	138	a->init=0;
	139	a->flags=0;
	140	return(1);
	141	}
	142
6b691a5c	143	static int enc_read(BIO b, char out, int outl)
d02b48c6 RE	144	{
	145	int ret=0,i;
	146	BIO_ENC_CTX *ctx;
	147
	148	if (out == NULL) return(0);
	149	ctx=(BIO_ENC_CTX *)b->ptr;
	150
	151	if ((ctx == NULL) \|\| (b->next_bio == NULL)) return(0);
	152
	153	/* First check if there are bytes decoded/encoded */
	154	if (ctx->buf_len > 0)
	155	{
	156	i=ctx->buf_len-ctx->buf_off;
	157	if (i > outl) i=outl;
	158	memcpy(out,&(ctx->buf[ctx->buf_off]),i);
	159	ret=i;
	160	out+=i;
	161	outl-=i;
	162	ctx->buf_off+=i;
	163	if (ctx->buf_len == ctx->buf_off)
	164	{
	165	ctx->buf_len=0;
	166	ctx->buf_off=0;
	167	}
	168	}
	169
	170	/* At this point, we have room of outl bytes and an empty
	171	* buffer, so we should read in some more. */
	172
	173	while (outl > 0)
	174	{
	175	if (ctx->cont <= 0) break;
	176
1a095560	177	/* read in at IV offset, read the EVP_Cipher
d02b48c6	178	* documentation about why */
757e392d	179	i=BIO_read(b->next_bio,&(ctx->buf[BUF_OFFSET]),ENC_BLOCK_SIZE);
d02b48c6 RE	180
	181	if (i <= 0)
	182	{
	183	/* Should be continue next time we are called? */
	184	if (!BIO_should_retry(b->next_bio))
	185	{
	186	ctx->cont=i;
581f1c84	187	i=EVP_CipherFinal_ex(&(ctx->cipher),
d02b48c6 RE	188	(unsigned char *)ctx->buf,
	189	&(ctx->buf_len));
	190	ctx->ok=i;
	191	ctx->buf_off=0;
	192	}
7b65c329 DSH	193	else
7b65c329 DSH	194	{
d02b48c6	195	ret=(ret == 0)?i:ret;
7b65c329 DSH	196	break;
7b65c329 DSH	197	}
d02b48c6 RE	198	}
	199	else
	200	{
b6dcdbfc	201	if (!EVP_CipherUpdate(&(ctx->cipher),
d02b48c6	202	(unsigned char *)ctx->buf,&ctx->buf_len,
b6dcdbfc DSH	203	(unsigned char *)&(ctx->buf[BUF_OFFSET]),i))
	204	{
	205	BIO_clear_retry_flags(b);
	206	return 0;
	207	}
d02b48c6	208	ctx->cont=1;
7b65c329 DSH	209	/* Note: it is possible for EVP_CipherUpdate to
	210	* decrypt zero bytes because this is or looks like
	211	* the final block: if this happens we should retry
	212	* and either read more data or decrypt the final
	213	* block
	214	*/
	215	if(ctx->buf_len == 0) continue;
d02b48c6 RE	216	}
	217
	218	if (ctx->buf_len <= outl)
	219	i=ctx->buf_len;
	220	else
	221	i=outl;
d02b48c6 RE	222	if (i <= 0) break;
	223	memcpy(out,ctx->buf,i);
	224	ret+=i;
	225	ctx->buf_off=i;
	226	outl-=i;
	227	out+=i;
	228	}
	229
	230	BIO_clear_retry_flags(b);
	231	BIO_copy_next_retry(b);
	232	return((ret == 0)?ctx->cont:ret);
	233	}
	234
0e1c0612	235	static int enc_write(BIO b, const char in, int inl)
d02b48c6 RE	236	{
	237	int ret=0,n,i;
	238	BIO_ENC_CTX *ctx;
	239
	240	ctx=(BIO_ENC_CTX *)b->ptr;
	241	ret=inl;
	242
	243	BIO_clear_retry_flags(b);
	244	n=ctx->buf_len-ctx->buf_off;
	245	while (n > 0)
	246	{
	247	i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
	248	if (i <= 0)
	249	{
	250	BIO_copy_next_retry(b);
	251	return(i);
	252	}
	253	ctx->buf_off+=i;
	254	n-=i;
	255	}
	256	/* at this point all pending data has been written */
	257
	258	if ((in == NULL) \|\| (inl <= 0)) return(0);
	259
	260	ctx->buf_off=0;
	261	while (inl > 0)
	262	{
	263	n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl;
b6dcdbfc	264	if (!EVP_CipherUpdate(&(ctx->cipher),
d02b48c6	265	(unsigned char *)ctx->buf,&ctx->buf_len,
b6dcdbfc DSH	266	(unsigned char *)in,n))
	267	{
	268	BIO_clear_retry_flags(b);
	269	return 0;
	270	}
d02b48c6 RE	271	inl-=n;
	272	in+=n;
	273
	274	ctx->buf_off=0;
	275	n=ctx->buf_len;
	276	while (n > 0)
	277	{
	278	i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
	279	if (i <= 0)
	280	{
	281	BIO_copy_next_retry(b);
b8dc9693	282	return (ret == inl) ? i : ret - inl;
d02b48c6 RE	283	}
	284	n-=i;
	285	ctx->buf_off+=i;
	286	}
	287	ctx->buf_len=0;
	288	ctx->buf_off=0;
	289	}
	290	BIO_copy_next_retry(b);
	291	return(ret);
	292	}
	293
0e1c0612	294	static long enc_ctrl(BIO b, int cmd, long num, void ptr)
d02b48c6 RE	295	{
	296	BIO *dbio;
	297	BIO_ENC_CTX ctx,dctx;
	298	long ret=1;
	299	int i;
dfeab068	300	EVP_CIPHER_CTX **c_ctx;
d02b48c6 RE	301
	302	ctx=(BIO_ENC_CTX *)b->ptr;
	303
	304	switch (cmd)
	305	{
	306	case BIO_CTRL_RESET:
	307	ctx->ok=1;
	308	ctx->finished=0;
b6dcdbfc DSH	309	if (!EVP_CipherInit_ex(&(ctx->cipher),NULL,NULL,NULL,NULL,
	310	ctx->cipher.encrypt))
	311	return 0;
d02b48c6 RE	312	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	313	break;
	314	case BIO_CTRL_EOF: /* More to read */
	315	if (ctx->cont <= 0)
	316	ret=1;
	317	else
	318	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	319	break;
	320	case BIO_CTRL_WPENDING:
	321	ret=ctx->buf_len-ctx->buf_off;
	322	if (ret <= 0)
	323	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	324	break;
	325	case BIO_CTRL_PENDING: /* More to read in buffer */
	326	ret=ctx->buf_len-ctx->buf_off;
	327	if (ret <= 0)
	328	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	329	break;
	330	case BIO_CTRL_FLUSH:
	331	/* do a final write */
	332	again:
	333	while (ctx->buf_len != ctx->buf_off)
	334	{
	335	i=enc_write(b,NULL,0);
	336	if (i < 0)
b8dc9693	337	return i;
d02b48c6 RE	338	}
	339
	340	if (!ctx->finished)
	341	{
	342	ctx->finished=1;
	343	ctx->buf_off=0;
581f1c84	344	ret=EVP_CipherFinal_ex(&(ctx->cipher),
d02b48c6 RE	345	(unsigned char *)ctx->buf,
	346	&(ctx->buf_len));
	347	ctx->ok=(int)ret;
	348	if (ret <= 0) break;
	349
	350	/* push out the bytes */
	351	goto again;
	352	}
	353
	354	/* Finally flush the underlying BIO */
	355	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	356	break;
	357	case BIO_C_GET_CIPHER_STATUS:
	358	ret=(long)ctx->ok;
	359	break;
	360	case BIO_C_DO_STATE_MACHINE:
	361	BIO_clear_retry_flags(b);
	362	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	363	BIO_copy_next_retry(b);
	364	break;
dfeab068 RE	365	case BIO_C_GET_CIPHER_CTX:
	366	c_ctx=(EVP_CIPHER_CTX **)ptr;
	367	(*c_ctx)= &(ctx->cipher);
	368	b->init=1;
	369	break;
d02b48c6 RE	370	case BIO_CTRL_DUP:
	371	dbio=(BIO *)ptr;
	372	dctx=(BIO_ENC_CTX *)dbio->ptr;
c2bf7208 DSH	373	EVP_CIPHER_CTX_init(&dctx->cipher);
	374	ret = EVP_CIPHER_CTX_copy(&dctx->cipher,&ctx->cipher);
	375	if (ret)
	376	dbio->init=1;
d02b48c6 RE	377	break;
	378	default:
	379	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	380	break;
	381	}
	382	return(ret);
	383	}
	384
13083215	385	static long enc_callback_ctrl(BIO b, int cmd, bio_info_cb fp)
d3442bc7 RL	386	{
	387	long ret=1;
	388
	389	if (b->next_bio == NULL) return(0);
	390	switch (cmd)
	391	{
	392	default:
	393	ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
	394	break;
	395	}
	396	return(ret);
	397	}
	398
58964a49 RE	399	/*
	400	void BIO_set_cipher_ctx(b,c)
	401	BIO *b;
	402	EVP_CIPHER_ctx *c;
	403	{
	404	if (b == NULL) return;
	405
	406	if ((b->callback != NULL) &&
	407	(b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
	408	return;
	409
	410	b->init=1;
	411	ctx=(BIO_ENC_CTX *)b->ptr;
	412	memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
	413
	414	if (b->callback != NULL)
	415	b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
	416	}
	417	*/
	418
b6dcdbfc	419	int BIO_set_cipher(BIO b, const EVP_CIPHER c, const unsigned char *k,
875a644a	420	const unsigned char *i, int e)
d02b48c6 RE	421	{
	422	BIO_ENC_CTX *ctx;
	423
b6dcdbfc	424	if (b == NULL) return 0;
d02b48c6 RE	425
d02b48c6 RE	426	if ((b->callback != NULL) &&
e778802f	427	(b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,0L) <= 0))
b6dcdbfc	428	return 0;
d02b48c6 RE	429
	430	b->init=1;
	431	ctx=(BIO_ENC_CTX *)b->ptr;
b6dcdbfc DSH	432	if (!EVP_CipherInit_ex(&(ctx->cipher),c,NULL, k,i,e))
b6dcdbfc DSH	433	return 0;
d02b48c6 RE	434
d02b48c6 RE	435	if (b->callback != NULL)
b6dcdbfc DSH	436	return b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,1L);
b6dcdbfc DSH	437	return 1;
d02b48c6 RE	438	}
d02b48c6 RE	439