Add OpenSSL BIO method that writes to a std::string.

crypto/crypto.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'crypto.gypi',
@@ skipping 114 matching lines @@
               'third_party/nss/rsawrapr.c',
               'third_party/nss/secsign.cc',
               'third_party/nss/sha512.cc',
             ],
           }, {
             'sources!': [
               'ec_private_key_openssl.cc',
               'ec_signature_creator_openssl.cc',
               'encryptor_openssl.cc',
               'hmac_openssl.cc',
+              'openssl_bio_string.cc',
+              'openssl_bio_string.h',
               'openssl_util.cc',
               'openssl_util.h',
               'rsa_private_key_openssl.cc',
               'secure_hash_openssl.cc',
               'signature_creator_openssl.cc',
               'signature_verifier_openssl.cc',
               'symmetric_key_openssl.cc',
             ],
         },],
       ],
       'sources': [
         '<@(crypto_sources)',
       ],
     },
     {
       'target_name': 'crypto_unittests',
       'type': 'executable',
       'sources': [
         'curve25519_unittest.cc',
         'ec_private_key_unittest.cc',
         'ec_signature_creator_unittest.cc',
         'encryptor_unittest.cc',
         'ghash_unittest.cc',
         'hkdf_unittest.cc',
         'hmac_unittest.cc',
         'nss_util_unittest.cc',
+        'openssl_bio_string_unittest.cc',
         'p224_unittest.cc',
         'p224_spake_unittest.cc',
         'random_unittest.cc',
         'rsa_private_key_unittest.cc',
         'rsa_private_key_nss_unittest.cc',
         'secure_hash_unittest.cc',
         'sha2_unittest.cc',
         'signature_creator_unittest.cc',
         'signature_verifier_unittest.cc',
         'symmetric_key_unittest.cc',
@@ skipping 31 matching lines @@
         }],
         [ 'OS == "win"', {
           # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
           'msvs_disabled_warnings': [4267, ],
         }],
         [ 'use_openssl==1', {
           'sources!': [
             'nss_util_unittest.cc',
             'rsa_private_key_nss_unittest.cc',
           ],
+        }, {
+          'sources!': [
+            'openssl_bio_string_unittest.cc',
+          ],
         }],
       ],
     },
   ],
   'conditions': [
     ['OS == "win" and target_arch=="ia32"', {
       'targets': [
         {
           'target_name': 'crypto_nacl_win64',
           # We do not want nacl_helper to depend on NSS because this would
@@ skipping 17 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }