1 /* 2 * Copyright 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <keymaster/android_keymaster_utils.h> 18 19 #include <new> 20 21 namespace keymaster { 22 23 // Keymaster never manages enormous buffers, so anything particularly large is bad data or the 24 // result of a bug. We arbitrarily set a 16 MiB limit. 25 const size_t kMaxDupBufferSize = 16 * 1024 * 1024; 26 27 uint8_t* dup_buffer(const void* buf, size_t size) { 28 if (size >= kMaxDupBufferSize) 29 return nullptr; 30 uint8_t* retval = new (std::nothrow) uint8_t[size]; 31 if (retval) 32 memcpy(retval, buf, size); 33 return retval; 34 } 35 36 int memcmp_s(const void* p1, const void* p2, size_t length) { 37 const uint8_t* s1 = static_cast<const uint8_t*>(p1); 38 const uint8_t* s2 = static_cast<const uint8_t*>(p2); 39 uint8_t result = 0; 40 while (length-- > 0) 41 result |= *s1++ ^ *s2++; 42 return result == 0 ? 0 : 1; 43 } 44 45 } // namespace keymaster 46