src/src/hash.h

   1 /*
   2  *  Exim - an Internet mail transport agent
   3  *  Copyright (c) The Exim Maintainers 1995 - 2022
   4  *  SPDX-License-Identifier: GPL-2.0-or-later
   5  *
   6  *  Hash interface functions
   7  */
   8
   9 #include "exim.h"
  10
  11 #if !defined(HASH_H)    /* entire file */
  12 #define HASH_H
  13
  14 #include "sha_ver.h"
  15
  16 #ifdef SHA_OPENSSL
  17 # include <openssl/sha.h>
  18 #elif defined SHA_GNUTLS
  19 # include <gnutls/crypto.h>
  20 #elif defined(SHA_GCRYPT)
  21 # include <gcrypt.h>
  22 #elif defined(SHA_POLARSSL)
  23 # include "pdkim/pdkim.h"               /*XXX ugly */
  24 # include "pdkim/polarssl/sha1.h"
  25 # include "pdkim/polarssl/sha2.h"
  26 #endif
  27
  28
  29 /* Hash context for the exim_sha_* routines */
  30
  31 typedef enum hashmethod {
  32   HASH_BADTYPE,
  33   HASH_NULL,
  34   HASH_SHA1,
  35
  36   HASH_SHA2_256,
  37   HASH_SHA2_384,
  38   HASH_SHA2_512,
  39
  40   HASH_SHA3_224,
  41   HASH_SHA3_256,
  42   HASH_SHA3_384,
  43   HASH_SHA3_512,
  44 } hashmethod;
  45
  46 typedef struct {
  47   hashmethod    method;
  48   int           hashlen;
  49
  50 #ifdef SHA_OPENSSL
  51   union {
  52     SHA_CTX      sha1;       /* SHA1 block                                */
  53     SHA256_CTX   sha2_256;   /* SHA256 or 224 block                       */
  54     SHA512_CTX   sha2_512;   /* SHA512 or 384 block                       */
  55 #ifdef EXIM_HAVE_SHA3
  56     EVP_MD_CTX * mctx;       /* SHA3 block                                */
  57 #endif
  58   } u;
  59
  60 #elif defined(SHA_GNUTLS)
  61   gnutls_hash_hd_t sha;      /* Either SHA1 or SHA256 block               */
  62
  63 #elif defined(SHA_GCRYPT)
  64   gcry_md_hd_t sha;          /* Either SHA1 or SHA256 block               */
  65
  66 #elif defined(SHA_POLARSSL)
  67   union {
  68     sha1_context sha1;       /* SHA1 block                                */
  69     sha2_context sha2;       /* SHA256 block                              */
  70   } u;
  71
  72 #elif defined(SHA_NATIVE)
  73   sha1 sha1;
  74 #endif
  75
  76 } hctx;
  77
  78 extern BOOL     exim_sha_init(hctx *, hashmethod);
  79 extern void     exim_sha_update(hctx *, const uschar *a, int);
  80 extern void     exim_sha_update_string(hctx *, const uschar *a);
  81 extern void     exim_sha_finish(hctx *, blob *);
  82
  83 #endif
  84 /* End of File */