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      1 /*
      2  * libjingle
      3  * Copyright 2012, Google Inc.
      4  * Copyright 2012, RTFM Inc.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions are met:
      8  *
      9  *  1. Redistributions of source code must retain the above copyright notice,
     10  *     this list of conditions and the following disclaimer.
     11  *  2. Redistributions in binary form must reproduce the above copyright notice,
     12  *     this list of conditions and the following disclaimer in the documentation
     13  *     and/or other materials provided with the distribution.
     14  *  3. The name of the author may not be used to endorse or promote products
     15  *     derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     18  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     20  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     23  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     25  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     26  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef TALK_BASE_SSLFINGERPRINT_H_
     30 #define TALK_BASE_SSLFINGERPRINT_H_
     31 
     32 #include <ctype.h>
     33 #include <string>
     34 
     35 #include "talk/base/buffer.h"
     36 #include "talk/base/helpers.h"
     37 #include "talk/base/messagedigest.h"
     38 #include "talk/base/sslidentity.h"
     39 #include "talk/base/stringencode.h"
     40 
     41 namespace talk_base {
     42 
     43 struct SSLFingerprint {
     44   static SSLFingerprint* Create(const std::string& algorithm,
     45                                 const talk_base::SSLIdentity* identity) {
     46     if (!identity) {
     47       return NULL;
     48     }
     49 
     50     return Create(algorithm, &(identity->certificate()));
     51   }
     52 
     53   static SSLFingerprint* Create(const std::string& algorithm,
     54                                 const talk_base::SSLCertificate* cert) {
     55     uint8 digest_val[64];
     56     size_t digest_len;
     57     bool ret = cert->ComputeDigest(
     58         algorithm, digest_val, sizeof(digest_val), &digest_len);
     59     if (!ret) {
     60       return NULL;
     61     }
     62 
     63     return new SSLFingerprint(algorithm, digest_val, digest_len);
     64   }
     65 
     66   static SSLFingerprint* CreateFromRfc4572(const std::string& algorithm,
     67                                            const std::string& fingerprint) {
     68     if (algorithm.empty())
     69       return NULL;
     70 
     71     if (fingerprint.empty())
     72       return NULL;
     73 
     74     size_t value_len;
     75     char value[talk_base::MessageDigest::kMaxSize];
     76     value_len = talk_base::hex_decode_with_delimiter(value, sizeof(value),
     77                                                      fingerprint.c_str(),
     78                                                      fingerprint.length(),
     79                                                      ':');
     80     if (!value_len)
     81       return NULL;
     82 
     83     return new SSLFingerprint(algorithm,
     84                               reinterpret_cast<uint8*>(value),
     85                               value_len);
     86   }
     87 
     88   SSLFingerprint(const std::string& algorithm, const uint8* digest_in,
     89                  size_t digest_len) : algorithm(algorithm) {
     90     digest.SetData(digest_in, digest_len);
     91   }
     92   SSLFingerprint(const SSLFingerprint& from)
     93       : algorithm(from.algorithm), digest(from.digest) {}
     94   bool operator==(const SSLFingerprint& other) const {
     95     return algorithm == other.algorithm &&
     96            digest == other.digest;
     97   }
     98 
     99   std::string GetRfc4572Fingerprint() const {
    100     std::string fingerprint =
    101         talk_base::hex_encode_with_delimiter(
    102             digest.data(), digest.length(), ':');
    103     std::transform(fingerprint.begin(), fingerprint.end(),
    104                    fingerprint.begin(), ::toupper);
    105     return fingerprint;
    106   }
    107 
    108   std::string algorithm;
    109   talk_base::Buffer digest;
    110 };
    111 
    112 }  // namespace talk_base
    113 
    114 #endif  // TALK_BASE_SSLFINGERPRINT_H_
    115