c94e531293732fa4a36080893054bf8533869b37
[exim.git] / 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-only
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 */