internal.h revision 1e4884f615b20946411a74e41eb9c6aa65e2d5f3 
1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#ifndef OPENSSL_HEADER_DIGEST_INTERNAL_H
58#define OPENSSL_HEADER_DIGEST_INTERNAL_H
59
60#include <openssl/base.h>
61
62#if defined(__cplusplus)
63extern "C" {
64#endif
65
66
67struct env_md_st {
68  /* type contains a NID identifing the digest function. (For example,
69   * NID_md5.) */
70  int type;
71
72  /* md_size contains the size, in bytes, of the resulting digest. */
73  unsigned md_size;
74
75  /* flags contains the OR of |EVP_MD_FLAG_*| values. */
76  uint32_t flags;
77
78  /* init initialises the state in |ctx->md_data|. */
79  void (*init)(EVP_MD_CTX *ctx);
80
81  /* update hashes |len| bytes of |data| into the state in |ctx->md_data|. */
82  void (*update)(EVP_MD_CTX *ctx, const void *data, size_t count);
83
84  /* final completes the hash and writes |md_size| bytes of digest to |out|. */
85  void (*final)(EVP_MD_CTX *ctx, uint8_t *out);
86
87  /* block_size contains the hash's native block size. */
88  unsigned block_size;
89
90  /* ctx_size contains the size, in bytes, of the state of the hash function. */
91  unsigned ctx_size;
92};
93
94/* evp_md_pctx_ops contains function pointers to allow the |pctx| member of
95 * |EVP_MD_CTX| to be manipulated without breaking layering by calling EVP
96 * functions. */
97struct evp_md_pctx_ops {
98  /* free is called when an |EVP_MD_CTX| is being freed and the |pctx| also
99   * needs to be freed. */
100  void (*free) (EVP_PKEY_CTX *pctx);
101
102  /* dup is called when an |EVP_MD_CTX| is copied and so the |pctx| also needs
103   * to be copied. */
104  EVP_PKEY_CTX* (*dup) (EVP_PKEY_CTX *pctx);
105};
106
107
108#if defined(__cplusplus)
109}  /* extern C */
110#endif
111
112#endif  /* OPENSSL_HEADER_DIGEST_INTERNAL */
113