1/* crypto/evp/bio_md.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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"
62#include <openssl/buffer.h>
63#include <openssl/evp.h>
64
65/* BIO_put and BIO_get both add to the digest,
66 * BIO_gets returns the digest */
67
68static int md_write(BIO *h, char const *buf, int num);
69static int md_read(BIO *h, char *buf, int size);
70/*static int md_puts(BIO *h, const char *str); */
71static int md_gets(BIO *h, char *str, int size);
72static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);
73static int md_new(BIO *h);
74static int md_free(BIO *data);
75static long md_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);
76
77static BIO_METHOD methods_md=
78	{
79	BIO_TYPE_MD,"message digest",
80	md_write,
81	md_read,
82	NULL, /* md_puts, */
83	md_gets,
84	md_ctrl,
85	md_new,
86	md_free,
87	md_callback_ctrl,
88	};
89
90BIO_METHOD *BIO_f_md(void)
91	{
92	return(&methods_md);
93	}
94
95static int md_new(BIO *bi)
96	{
97	EVP_MD_CTX *ctx;
98
99	ctx=EVP_MD_CTX_create();
100	if (ctx == NULL) return(0);
101
102	bi->init=0;
103	bi->ptr=(char *)ctx;
104	bi->flags=0;
105	return(1);
106	}
107
108static int md_free(BIO *a)
109	{
110	if (a == NULL) return(0);
111	EVP_MD_CTX_destroy(a->ptr);
112	a->ptr=NULL;
113	a->init=0;
114	a->flags=0;
115	return(1);
116	}
117
118static int md_read(BIO *b, char *out, int outl)
119	{
120	int ret=0;
121	EVP_MD_CTX *ctx;
122
123	if (out == NULL) return(0);
124	ctx=b->ptr;
125
126	if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
127
128	ret=BIO_read(b->next_bio,out,outl);
129	if (b->init)
130		{
131		if (ret > 0)
132			{
133			if (EVP_DigestUpdate(ctx,(unsigned char *)out,
134				(unsigned int)ret)<=0) return (-1);
135			}
136		}
137	BIO_clear_retry_flags(b);
138	BIO_copy_next_retry(b);
139	return(ret);
140	}
141
142static int md_write(BIO *b, const char *in, int inl)
143	{
144	int ret=0;
145	EVP_MD_CTX *ctx;
146
147	if ((in == NULL) || (inl <= 0)) return(0);
148	ctx=b->ptr;
149
150	if ((ctx != NULL) && (b->next_bio != NULL))
151		ret=BIO_write(b->next_bio,in,inl);
152	if (b->init)
153		{
154		if (ret > 0)
155			{
156			if (!EVP_DigestUpdate(ctx,(const unsigned char *)in,
157				(unsigned int)ret))
158				{
159				BIO_clear_retry_flags(b);
160				return 0;
161				}
162			}
163		}
164	if(b->next_bio != NULL)
165		{
166		BIO_clear_retry_flags(b);
167		BIO_copy_next_retry(b);
168		}
169	return(ret);
170	}
171
172static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
173	{
174	EVP_MD_CTX *ctx,*dctx,**pctx;
175	const EVP_MD **ppmd;
176	EVP_MD *md;
177	long ret=1;
178	BIO *dbio;
179
180	ctx=b->ptr;
181
182	switch (cmd)
183		{
184	case BIO_CTRL_RESET:
185		if (b->init)
186			ret = EVP_DigestInit_ex(ctx,ctx->digest, NULL);
187		else
188			ret=0;
189		if (ret > 0)
190			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
191		break;
192	case BIO_C_GET_MD:
193		if (b->init)
194			{
195			ppmd=ptr;
196			*ppmd=ctx->digest;
197			}
198		else
199			ret=0;
200		break;
201	case BIO_C_GET_MD_CTX:
202		pctx=ptr;
203		*pctx=ctx;
204		b->init = 1;
205		break;
206	case BIO_C_SET_MD_CTX:
207		if (b->init)
208			b->ptr=ptr;
209		else
210			ret=0;
211		break;
212	case BIO_C_DO_STATE_MACHINE:
213		BIO_clear_retry_flags(b);
214		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
215		BIO_copy_next_retry(b);
216		break;
217
218	case BIO_C_SET_MD:
219		md=ptr;
220		ret = EVP_DigestInit_ex(ctx,md, NULL);
221		if (ret > 0)
222			b->init=1;
223		break;
224	case BIO_CTRL_DUP:
225		dbio=ptr;
226		dctx=dbio->ptr;
227		if (!EVP_MD_CTX_copy_ex(dctx,ctx))
228			return 0;
229		b->init=1;
230		break;
231	default:
232		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
233		break;
234		}
235	return(ret);
236	}
237
238static long md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
239	{
240	long ret=1;
241
242	if (b->next_bio == NULL) return(0);
243	switch (cmd)
244		{
245	default:
246		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
247		break;
248		}
249	return(ret);
250	}
251
252static int md_gets(BIO *bp, char *buf, int size)
253	{
254	EVP_MD_CTX *ctx;
255	unsigned int ret;
256
257
258	ctx=bp->ptr;
259	if (size < ctx->digest->md_size)
260		return(0);
261	if (EVP_DigestFinal_ex(ctx,(unsigned char *)buf,&ret)<=0)
262		return -1;
263
264	return((int)ret);
265	}
266
267/*
268static int md_puts(bp,str)
269BIO *bp;
270char *str;
271	{
272	return(-1);
273	}
274*/
275
276