1 /*
2  *  PDKIM - a RFC4871 (DKIM) implementation
3  *
4  *  Copyright (C) 1995 - 2020  Exim maintainers
5  *
6  *  RSA signing/verification interface
7  */
8 
9 #include "../exim.h"
10 
11 #ifndef DISABLE_DKIM	/* entire file */
12 
13 #include "crypt_ver.h"
14 
15 #ifdef SIGN_OPENSSL
16 # include <openssl/rsa.h>
17 # include <openssl/ssl.h>
18 # include <openssl/err.h>
19 #elif defined(SIGN_GNUTLS)
20 # include <gnutls/gnutls.h>
21 # include <gnutls/x509.h>
22 # include <gnutls/abstract.h>
23 #elif defined(SIGN_GCRYPT)
24 # include <gcrypt.h>
25 # include <libtasn1.h>
26 #endif
27 
28 #include "../blob.h"
29 
30 typedef enum {
31   KEYTYPE_RSA,
32   KEYTYPE_ED25519
33 } keytype;
34 
35 typedef enum {
36   KEYFMT_DER,		/* an asn.1 structure */
37   KEYFMT_ED25519_BARE	/* just the key */
38 } keyformat;
39 
40 
41 #ifdef SIGN_OPENSSL
42 
43 typedef struct {
44   keytype	keytype;
45   EVP_PKEY *	key;
46 } es_ctx;
47 
48 typedef struct {
49   keytype	keytype;
50   EVP_PKEY *	key;
51 } ev_ctx;
52 
53 #elif defined(SIGN_GNUTLS)
54 
55 typedef struct {
56   keytype	keytype;
57   gnutls_privkey_t key;
58 } es_ctx;
59 
60 typedef struct {
61   keytype	keytype;
62   gnutls_pubkey_t key;
63 } ev_ctx;
64 
65 #elif defined(SIGN_GCRYPT)
66 
67 typedef struct {
68   keytype	keytype;
69   gcry_mpi_t n;
70   gcry_mpi_t e;
71   gcry_mpi_t d;
72   gcry_mpi_t p;
73   gcry_mpi_t q;
74   gcry_mpi_t dp;
75   gcry_mpi_t dq;
76   gcry_mpi_t qp;
77 } es_ctx;
78 
79 typedef struct {
80   keytype	keytype;
81   gcry_mpi_t n;
82   gcry_mpi_t e;
83 } ev_ctx;
84 
85 #endif
86 
87 
88 extern void exim_dkim_init(void);
89 extern gstring * exim_dkim_data_append(gstring *, uschar *);
90 
91 extern const uschar * exim_dkim_signing_init(const uschar *, es_ctx *);
92 extern const uschar * exim_dkim_sign(es_ctx *, hashmethod, blob *, blob *);
93 extern const uschar * exim_dkim_verify_init(blob *, keyformat, ev_ctx *, unsigned *);
94 extern const uschar * exim_dkim_verify(ev_ctx *, hashmethod, blob *, blob *);
95 
96 #endif	/*DISABLE_DKIM*/
97 /* End of File */
98