_ Git - BearSSL/blob - src/ssl/ssl_ccert_single_rsa.c

   1 /*
   2  * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #include "inner.h"
  26
  27 static void
  28 cc_none0(const br_ssl_client_certificate_class **pctx)
  29 {
  30         (void)pctx;
  31 }
  32
  33 static void
  34 cc_none1(const br_ssl_client_certificate_class **pctx, size_t len)
  35 {
  36         (void)pctx;
  37         (void)len;
  38 }
  39
  40 static void
  41 cc_none2(const br_ssl_client_certificate_class **pctx,
  42         const unsigned char *data, size_t len)
  43 {
  44         (void)pctx;
  45         (void)data;
  46         (void)len;
  47 }
  48
  49 static void
  50 cc_choose(const br_ssl_client_certificate_class **pctx,
  51         const br_ssl_client_context *cc, uint32_t auth_types,
  52         br_ssl_client_certificate *choices)
  53 {
  54         br_ssl_client_certificate_rsa_context *zc;
  55         int x;
  56
  57         (void)cc;
  58         zc = (br_ssl_client_certificate_rsa_context *)pctx;
  59         x = br_ssl_choose_hash((unsigned)auth_types);
  60         if (x == 0 && (auth_types & 1) == 0) {
  61                 memset(choices, 0, sizeof *choices);
  62         }
  63         choices->auth_type = BR_AUTH_RSA;
  64         choices->hash_id = x;
  65         choices->chain = zc->chain;
  66         choices->chain_len = zc->chain_len;
  67 }
  68
  69 /*
  70  * OID for hash functions in RSA signatures.
  71  */
  72 static const unsigned char HASH_OID_SHA1[] = {
  73         0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A
  74 };
  75
  76 static const unsigned char HASH_OID_SHA224[] = {
  77         0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04
  78 };
  79
  80 static const unsigned char HASH_OID_SHA256[] = {
  81         0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01
  82 };
  83
  84 static const unsigned char HASH_OID_SHA384[] = {
  85         0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02
  86 };
  87
  88 static const unsigned char HASH_OID_SHA512[] = {
  89         0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03
  90 };
  91
  92 static const unsigned char *HASH_OID[] = {
  93         HASH_OID_SHA1,
  94         HASH_OID_SHA224,
  95         HASH_OID_SHA256,
  96         HASH_OID_SHA384,
  97         HASH_OID_SHA512
  98 };
  99
 100 static size_t
 101 cc_do_sign(const br_ssl_client_certificate_class **pctx,
 102         int hash_id, size_t hv_len, unsigned char *data, size_t len)
 103 {
 104         br_ssl_client_certificate_rsa_context *zc;
 105         unsigned char hv[64];
 106         const unsigned char *hash_oid;
 107         size_t sig_len;
 108
 109         zc = (br_ssl_client_certificate_rsa_context *)pctx;
 110         memcpy(hv, data, hv_len);
 111         if (hash_id == 0) {
 112                 hash_oid = NULL;
 113         } else if (hash_id >= 2 && hash_id <= 6) {
 114                 hash_oid = HASH_OID[hash_id - 2];
 115         } else {
 116                 return 0;
 117         }
 118         sig_len = (zc->sk->n_bitlen + 7) >> 3;
 119         if (len < sig_len) {
 120                 return 0;
 121         }
 122         return zc->irsasign(hash_oid, hv, hv_len, zc->sk, data) ? sig_len : 0;
 123 }
 124
 125 static const br_ssl_client_certificate_class ccert_vtable = {
 126         sizeof(br_ssl_client_certificate_rsa_context),
 127         cc_none0, /* start_name_list */
 128         cc_none1, /* start_name */
 129         cc_none2, /* append_name */
 130         cc_none0, /* end_name */
 131         cc_none0, /* end_name_list */
 132         cc_choose,
 133         0,
 134         cc_do_sign
 135 };
 136
 137 /* see bearssl_ssl.h */
 138 void
 139 br_ssl_client_set_single_rsa(br_ssl_client_context *cc,
 140         const br_x509_certificate *chain, size_t chain_len,
 141         const br_rsa_private_key *sk, br_rsa_pkcs1_sign irsasign)
 142 {
 143         cc->client_auth.single_rsa.vtable = &ccert_vtable;
 144         cc->client_auth.single_rsa.chain = chain;
 145         cc->client_auth.single_rsa.chain_len = chain_len;
 146         cc->client_auth.single_rsa.sk = sk;
 147         cc->client_auth.single_rsa.irsasign = irsasign;
 148         cc->client_auth_vtable = &cc->client_auth.single_rsa.vtable;
 149 }