1 /* 2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #ifndef OPENSSL_HEADER_DIGEST_INTERNAL_H 11 #define OPENSSL_HEADER_DIGEST_INTERNAL_H 12 13 #include <openssl/base.h> 14 15 #if defined(__cplusplus) 16 extern "C" { 17 #endif 18 19 20 struct env_md_st { 21 // type contains a NID identifing the digest function. (For example, 22 // NID_md5.) 23 int type; 24 25 // md_size contains the size, in bytes, of the resulting digest. 26 unsigned md_size; 27 28 // flags contains the OR of |EVP_MD_FLAG_*| values. 29 uint32_t flags; 30 31 // init initialises the state in |ctx->md_data|. 32 void (*init)(EVP_MD_CTX *ctx); 33 34 // update hashes |len| bytes of |data| into the state in |ctx->md_data|. 35 void (*update)(EVP_MD_CTX *ctx, const void *data, size_t count); 36 37 // final completes the hash and writes |md_size| bytes of digest to |out|. 38 void (*final)(EVP_MD_CTX *ctx, uint8_t *out); 39 40 // block_size contains the hash's native block size. 41 unsigned block_size; 42 43 // ctx_size contains the size, in bytes, of the state of the hash function. 44 unsigned ctx_size; 45 }; 46 47 // evp_md_pctx_ops contains function pointers to allow the |pctx| member of 48 // |EVP_MD_CTX| to be manipulated without breaking layering by calling EVP 49 // functions. 50 struct evp_md_pctx_ops { 51 // free is called when an |EVP_MD_CTX| is being freed and the |pctx| also 52 // needs to be freed. 53 void (*free) (EVP_PKEY_CTX *pctx); 54 55 // dup is called when an |EVP_MD_CTX| is copied and so the |pctx| also needs 56 // to be copied. 57 EVP_PKEY_CTX* (*dup) (EVP_PKEY_CTX *pctx); 58 }; 59 60 61 #if defined(__cplusplus) 62 } // extern C 63 #endif 64 65 #endif // OPENSSL_HEADER_DIGEST_INTERNAL 66