src/src/hash.h

   1 /*
   2  *  Exim - an Internet mail transport agent
   3  *
   4  *  Copyright (C) 2016  Exim maintainers
   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 #include "blob.h"
  16
  17 #ifdef SHA_OPENSSL
  18 # include <openssl/sha.h>
  19 #elif defined SHA_GNUTLS
  20 # include <gnutls/crypto.h>
  21 #elif defined(SHA_GCRYPT)
  22 # include <gcrypt.h>
  23 #elif defined(SHA_POLARSSL)
  24 # include "pdkim/pdkim.h"               /*XXX ugly */
  25 # include "pdkim/polarssl/sha1.h"
  26 # include "pdkim/polarssl/sha2.h"
  27 #endif
  28
  29
  30 /* Hash context for the exim_sha_* routines */
  31
  32 typedef enum hashmethod {
  33   HASH_SHA1,
  34   HASH_SHA256,
  35   HASH_SHA3
  36 } hashmethod;
  37
  38 typedef struct {
  39   hashmethod    method;
  40   int           hashlen;
  41
  42 #ifdef SHA_OPENSSL
  43   union {
  44     SHA_CTX      sha1;       /* SHA1 block                                */
  45     SHA256_CTX   sha2;       /* SHA256 block                              */
  46   } u;
  47
  48 #elif defined(SHA_GNUTLS)
  49   gnutls_hash_hd_t sha;      /* Either SHA1 or SHA256 block               */
  50
  51 #elif defined(SHA_GCRYPT)
  52   gcry_md_hd_t sha;          /* Either SHA1 or SHA256 block               */
  53
  54 #elif defined(SHA_POLARSSL)
  55   union {
  56     sha1_context sha1;       /* SHA1 block                                */
  57     sha2_context sha2;       /* SHA256 block                              */
  58   } u;
  59
  60 #elif defined(SHA_NATIVE)
  61   sha1 sha1;
  62 #endif
  63
  64 } hctx;
  65
  66 extern void     exim_sha_init(hctx *, hashmethod);
  67 extern void     exim_sha_update(hctx *, const uschar *a, int);
  68 extern void     exim_sha_finish(hctx *, blob *);
  69 extern int      exim_sha_hashlen(hctx *);
  70
  71 #endif
  72 /* End of File */