| /* |
| * Copyright 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <keymaster/android_keymaster_utils.h> |
| |
| #include <keymaster/new> |
| |
| namespace keymaster { |
| |
| // Keymaster never manages enormous buffers, so anything particularly large is bad data or the |
| // result of a bug. We arbitrarily set a 16 MiB limit. |
| const size_t kMaxDupBufferSize = 16 * 1024 * 1024; |
| |
| uint8_t* dup_buffer(const void* buf, size_t size) { |
| if (size >= kMaxDupBufferSize) |
| return nullptr; |
| uint8_t* retval = new (std::nothrow) uint8_t[size]; |
| if (retval) |
| memcpy(retval, buf, size); |
| return retval; |
| } |
| |
| int memcmp_s(const void* p1, const void* p2, size_t length) { |
| const uint8_t* s1 = static_cast<const uint8_t*>(p1); |
| const uint8_t* s2 = static_cast<const uint8_t*>(p2); |
| uint8_t result = 0; |
| for (; length > 0; length--) |
| result |= *s1++ ^ *s2++; |
| return result == 0 ? 0 : 1; |
| } |
| |
| keymaster_error_t EcKeySizeToCurve(uint32_t key_size_bits, keymaster_ec_curve_t* curve) { |
| switch (key_size_bits) { |
| default: |
| return KM_ERROR_UNSUPPORTED_KEY_SIZE; |
| |
| case 224: |
| *curve = KM_EC_CURVE_P_224; |
| break; |
| |
| case 256: |
| *curve = KM_EC_CURVE_P_256; |
| break; |
| |
| case 384: |
| *curve = KM_EC_CURVE_P_384; |
| break; |
| |
| case 521: |
| *curve = KM_EC_CURVE_P_521; |
| break; |
| } |
| |
| return KM_ERROR_OK; |
| } |
| |
| keymaster_error_t EcCurveToKeySize(keymaster_ec_curve_t curve, uint32_t* key_size_bits) { |
| switch (curve) { |
| default: |
| return KM_ERROR_UNSUPPORTED_EC_CURVE; |
| |
| case KM_EC_CURVE_P_224: |
| *key_size_bits = 224; |
| break; |
| |
| case KM_EC_CURVE_P_256: |
| *key_size_bits = 256; |
| break; |
| |
| case KM_EC_CURVE_P_384: |
| *key_size_bits = 384; |
| break; |
| |
| case KM_EC_CURVE_P_521: |
| *key_size_bits = 521; |
| break; |
| } |
| |
| return KM_ERROR_OK; |
| } |
| |
| } // namespace keymaster |