src/src/hash.h

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