1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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
