| /* |
| * Copyright 2020 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 <crypto_utils/android_pubkey.h> |
| #include <fuzzer/FuzzedDataProvider.h> |
| #include <string.h> |
| #include <memory> |
| #include <openssl/obj_mac.h> |
| #include <openssl/rsa.h> |
| #include <cstdio> |
| |
| #define ANDROID_PUBKEY_MODULUS_SIZE_WORDS (ANDROID_PUBKEY_MODULUS_SIZE / 4) |
| |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, std::size_t size) { |
| if (size < 2050) { |
| return 0; |
| } |
| |
| FuzzedDataProvider fdp(data, size); |
| |
| uint8_t buffer[ANDROID_PUBKEY_ENCODED_SIZE]; |
| uint32_t modulus_size_words = ANDROID_PUBKEY_MODULUS_SIZE_WORDS; |
| memcpy(buffer, &modulus_size_words, sizeof(uint32_t)); |
| |
| uint32_t n0inv = fdp.ConsumeIntegralInRange<uint32_t>(0,2^32); |
| memcpy(buffer+sizeof(uint32_t), &n0inv, sizeof(uint32_t)); |
| |
| std::string s = fdp.ConsumeBytesAsString(ANDROID_PUBKEY_MODULUS_SIZE); |
| uint8_t* modulus = (uint8_t*)s.c_str(); |
| memcpy(buffer+sizeof(uint32_t)*2, modulus, |
| sizeof(uint8_t)*ANDROID_PUBKEY_MODULUS_SIZE); |
| |
| std::string ss = fdp.ConsumeBytesAsString(ANDROID_PUBKEY_MODULUS_SIZE); |
| uint8_t* rr = (uint8_t*)ss.c_str(); |
| memcpy(buffer+sizeof(uint32_t)*2+ANDROID_PUBKEY_MODULUS_SIZE, rr, |
| sizeof(uint8_t)*ANDROID_PUBKEY_MODULUS_SIZE); |
| |
| int flip = fdp.ConsumeIntegralInRange<uint32_t>(0,1); |
| buffer[ANDROID_PUBKEY_ENCODED_SIZE-1] = (uint8_t)(flip == 0 ? 3 : 65537); |
| |
| RSA* new_key = nullptr; |
| android_pubkey_decode(buffer, sizeof(uint8_t)*ANDROID_PUBKEY_ENCODED_SIZE, &new_key); |
| |
| uint8_t key_data[ANDROID_PUBKEY_ENCODED_SIZE]; |
| android_pubkey_encode(new_key, key_data, sizeof(key_data)); |
| |
| assert(0 == memcmp(buffer, key_data, sizeof(buffer))); |
| |
| RSA_free(new_key); |
| |
| return 0; |
| } |