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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)
63 extern "C" {
64 #endif
65 
66 
67 struct 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.
97 struct 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