src/src/pdkim/signing.h

   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 */