release/src/router/tinc/src/openssl/rsa.c

   1 /*
   2     rsa.c -- RSA key handling
   3     Copyright (C) 2007-2013 Guus Sliepen <guus@tinc-vpn.org>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "../system.h"
  21
  22 #include <openssl/pem.h>
  23 #include <openssl/err.h>
  24
  25 #define __TINC_RSA_INTERNAL__
  26 typedef RSA rsa_t;
  27
  28 #include "../logger.h"
  29 #include "../rsa.h"
  30
  31 // Set RSA keys
  32
  33 rsa_t *rsa_set_hex_public_key(char *n, char *e) {
  34         rsa_t *rsa = RSA_new();
  35         if(!rsa)
  36                 return NULL;
  37
  38         if(BN_hex2bn(&rsa->n, n) != strlen(n) || BN_hex2bn(&rsa->e, e) != strlen(e)) {
  39                 RSA_free(rsa);
  40                 return false;
  41         }
  42
  43         return rsa;
  44 }
  45
  46 rsa_t *rsa_set_hex_private_key(char *n, char *e, char *d) {
  47         rsa_t *rsa = RSA_new();
  48         if(!rsa)
  49                 return NULL;
  50
  51         if(BN_hex2bn(&rsa->n, n) != strlen(n) || BN_hex2bn(&rsa->e, e) != strlen(e) || BN_hex2bn(&rsa->d, d) != strlen(d)) {
  52                 RSA_free(rsa);
  53                 return false;
  54         }
  55
  56         return rsa;
  57 }
  58
  59 // Read PEM RSA keys
  60
  61 rsa_t *rsa_read_pem_public_key(FILE *fp) {
  62         rsa_t *rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL);
  63
  64         if(!rsa)
  65                 rsa = PEM_read_RSA_PUBKEY(fp, NULL, NULL, NULL);
  66
  67         if(!rsa)
  68                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to read RSA public key: %s", ERR_error_string(ERR_get_error(), NULL));
  69
  70         return rsa;
  71 }
  72
  73 rsa_t *rsa_read_pem_private_key(FILE *fp) {
  74         rsa_t *rsa = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
  75
  76         if(!rsa)
  77                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to read RSA private key: %s", ERR_error_string(ERR_get_error(), NULL));
  78
  79         return rsa;
  80 }
  81
  82 size_t rsa_size(rsa_t *rsa) {
  83         return RSA_size(rsa);
  84 }
  85
  86 bool rsa_public_encrypt(rsa_t *rsa, void *in, size_t len, void *out) {
  87         if(RSA_public_encrypt(len, in, out, rsa, RSA_NO_PADDING) == len)
  88                 return true;
  89
  90         logger(DEBUG_ALWAYS, LOG_ERR, "Unable to perform RSA encryption: %s", ERR_error_string(ERR_get_error(), NULL));
  91         return false;
  92 }
  93
  94 bool rsa_private_decrypt(rsa_t *rsa, void *in, size_t len, void *out) {
  95         if(RSA_private_decrypt(len, in, out, rsa, RSA_NO_PADDING) == len)
  96                 return true;
  97
  98         logger(DEBUG_ALWAYS, LOG_ERR, "Unable to perform RSA decryption: %s", ERR_error_string(ERR_get_error(), NULL));
  99         return false;
 100 }
 101
 102 bool rsa_active(rsa_t *rsa) {
 103         return rsa;
 104 }
 105
 106 void rsa_free(rsa_t *rsa) {
 107         if(rsa)
 108                 RSA_free(rsa);
 109 }