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