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_BADTYPE,
  34   HASH_SHA1,
  35   HASH_SHA256,
  36   HASH_SHA3_224,
  37   HASH_SHA3_256,
  38   HASH_SHA3_384,
  39   HASH_SHA3_512,
  40 } hashmethod;
  41
  42 typedef struct {
  43   hashmethod    method;
  44   int           hashlen;
  45
  46 #ifdef SHA_OPENSSL
  47   union {
  48     SHA_CTX      sha1;       /* SHA1 block                                */
  49     SHA256_CTX   sha2;       /* SHA256 block                              */
  50   } u;
  51
  52 #elif defined(SHA_GNUTLS)
  53   gnutls_hash_hd_t sha;      /* Either SHA1 or SHA256 block               */
  54
  55 #elif defined(SHA_GCRYPT)
  56   gcry_md_hd_t sha;          /* Either SHA1 or SHA256 block               */
  57
  58 #elif defined(SHA_POLARSSL)
  59   union {
  60     sha1_context sha1;       /* SHA1 block                                */
  61     sha2_context sha2;       /* SHA256 block                              */
  62   } u;
  63
  64 #elif defined(SHA_NATIVE)
  65   sha1 sha1;
  66 #endif
  67
  68 } hctx;
  69
  70 extern void     exim_sha_init(hctx *, hashmethod);
  71 extern void     exim_sha_update(hctx *, const uschar *a, int);
  72 extern void     exim_sha_finish(hctx *, blob *);
  73 extern int      exim_sha_hashlen(hctx *);
  74
  75 #endif
  76 /* End of File */