Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 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 | |
Shawn Willden | a278f61 | 2014-12-23 11:22:21 -0700 | [diff] [blame] | 17 | #include "asymmetric_key.h" |
| 18 | |
Shawn Willden | f268d74 | 2014-08-19 15:36:26 -0600 | [diff] [blame] | 19 | #include <openssl/x509.h> |
| 20 | |
Shawn Willden | b9d584d | 2015-01-22 16:35:00 -0700 | [diff] [blame] | 21 | #include <hardware/keymaster_defs.h> |
Shawn Willden | 98d9b92 | 2014-08-26 08:14:10 -0600 | [diff] [blame] | 22 | |
Thai Duong | f862a76 | 2015-03-18 14:10:56 -0700 | [diff] [blame] | 23 | #include "ec_key.h" |
Shawn Willden | 567a4a0 | 2014-12-31 12:14:46 -0700 | [diff] [blame] | 24 | #include "openssl_err.h" |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 25 | #include "openssl_utils.h" |
Shawn Willden | a278f61 | 2014-12-23 11:22:21 -0700 | [diff] [blame] | 26 | #include "rsa_key.h" |
Shawn Willden | 72014ad | 2014-09-17 13:04:10 -0600 | [diff] [blame] | 27 | #include "unencrypted_key_blob.h" |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 28 | |
| 29 | namespace keymaster { |
| 30 | |
Shawn Willden | a278f61 | 2014-12-23 11:22:21 -0700 | [diff] [blame] | 31 | EVP_PKEY* AsymmetricKeyFactory::ExtractEvpKey(keymaster_key_format_t key_format, |
| 32 | keymaster_algorithm_t expected_algorithm, |
| 33 | const uint8_t* key_data, size_t key_data_length, |
| 34 | keymaster_error_t* error) { |
Shawn Willden | 4d306ec | 2015-03-04 07:29:49 -0700 | [diff] [blame] | 35 | *error = KM_ERROR_UNSUPPORTED_KEY_FORMAT; |
| 36 | if (key_format != KM_KEY_FORMAT_PKCS8) |
Shawn Willden | a278f61 | 2014-12-23 11:22:21 -0700 | [diff] [blame] | 37 | return NULL; |
Shawn Willden | a278f61 | 2014-12-23 11:22:21 -0700 | [diff] [blame] | 38 | |
Shawn Willden | 4d306ec | 2015-03-04 07:29:49 -0700 | [diff] [blame] | 39 | UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey; |
| 40 | *error = convert_pkcs8_blob_to_evp(key_data, key_data_length, expected_algorithm, &pkey); |
| 41 | if (*error != KM_ERROR_OK) |
Shawn Willden | a278f61 | 2014-12-23 11:22:21 -0700 | [diff] [blame] | 42 | return NULL; |
Shawn Willden | a278f61 | 2014-12-23 11:22:21 -0700 | [diff] [blame] | 43 | |
| 44 | return pkey.release(); |
| 45 | } |
| 46 | |
| 47 | static const keymaster_key_format_t supported_import_formats[] = {KM_KEY_FORMAT_PKCS8}; |
| 48 | const keymaster_key_format_t* AsymmetricKeyFactory::SupportedImportFormats(size_t* format_count) { |
| 49 | *format_count = array_length(supported_import_formats); |
| 50 | return supported_import_formats; |
| 51 | } |
| 52 | |
| 53 | static const keymaster_key_format_t supported_export_formats[] = {KM_KEY_FORMAT_X509}; |
| 54 | const keymaster_key_format_t* AsymmetricKeyFactory::SupportedExportFormats(size_t* format_count) { |
| 55 | *format_count = array_length(supported_export_formats); |
| 56 | return supported_export_formats; |
| 57 | } |
| 58 | |
Shawn Willden | 72014ad | 2014-09-17 13:04:10 -0600 | [diff] [blame] | 59 | keymaster_error_t AsymmetricKey::LoadKey(const UnencryptedKeyBlob& blob) { |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 60 | UniquePtr<EVP_PKEY, EVP_PKEY_Delete> evp_key(EVP_PKEY_new()); |
| 61 | if (evp_key.get() == NULL) |
| 62 | return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| 63 | |
| 64 | EVP_PKEY* tmp_pkey = evp_key.get(); |
Shawn Willden | 72014ad | 2014-09-17 13:04:10 -0600 | [diff] [blame] | 65 | const uint8_t* key_material = blob.unencrypted_key_material(); |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 66 | if (d2i_PrivateKey(evp_key_type(), &tmp_pkey, &key_material, blob.key_material_length()) == |
Shawn Willden | f01329d | 2015-03-11 21:51:38 -0600 | [diff] [blame^] | 67 | NULL) |
| 68 | return TranslateLastOpenSslError(); |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 69 | if (!EvpToInternal(evp_key.get())) |
Shawn Willden | 567a4a0 | 2014-12-31 12:14:46 -0700 | [diff] [blame] | 70 | return TranslateLastOpenSslError(); |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 71 | |
| 72 | return KM_ERROR_OK; |
| 73 | } |
| 74 | |
| 75 | keymaster_error_t AsymmetricKey::key_material(UniquePtr<uint8_t[]>* material, size_t* size) const { |
| 76 | if (material == NULL || size == NULL) |
| 77 | return KM_ERROR_OUTPUT_PARAMETER_NULL; |
| 78 | |
| 79 | UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey(EVP_PKEY_new()); |
| 80 | if (pkey.get() == NULL) |
| 81 | return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| 82 | |
| 83 | if (!InternalToEvp(pkey.get())) |
Shawn Willden | 567a4a0 | 2014-12-31 12:14:46 -0700 | [diff] [blame] | 84 | return TranslateLastOpenSslError(); |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 85 | |
| 86 | *size = i2d_PrivateKey(pkey.get(), NULL /* key_data*/); |
| 87 | if (*size <= 0) |
Shawn Willden | 567a4a0 | 2014-12-31 12:14:46 -0700 | [diff] [blame] | 88 | return TranslateLastOpenSslError(); |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 89 | |
| 90 | material->reset(new uint8_t[*size]); |
| 91 | uint8_t* tmp = material->get(); |
| 92 | i2d_PrivateKey(pkey.get(), &tmp); |
| 93 | |
| 94 | return KM_ERROR_OK; |
| 95 | } |
| 96 | |
Shawn Willden | f268d74 | 2014-08-19 15:36:26 -0600 | [diff] [blame] | 97 | keymaster_error_t AsymmetricKey::formatted_key_material(keymaster_key_format_t format, |
| 98 | UniquePtr<uint8_t[]>* material, |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 99 | size_t* size) const { |
Shawn Willden | f268d74 | 2014-08-19 15:36:26 -0600 | [diff] [blame] | 100 | if (format != KM_KEY_FORMAT_X509) |
| 101 | return KM_ERROR_UNSUPPORTED_KEY_FORMAT; |
| 102 | |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 103 | if (material == NULL || size == NULL) |
| 104 | return KM_ERROR_OUTPUT_PARAMETER_NULL; |
| 105 | |
Shawn Willden | f268d74 | 2014-08-19 15:36:26 -0600 | [diff] [blame] | 106 | UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey(EVP_PKEY_new()); |
| 107 | if (!InternalToEvp(pkey.get())) |
Shawn Willden | 567a4a0 | 2014-12-31 12:14:46 -0700 | [diff] [blame] | 108 | return TranslateLastOpenSslError(); |
Shawn Willden | f268d74 | 2014-08-19 15:36:26 -0600 | [diff] [blame] | 109 | |
| 110 | int key_data_length = i2d_PUBKEY(pkey.get(), NULL); |
| 111 | if (key_data_length <= 0) |
Shawn Willden | 567a4a0 | 2014-12-31 12:14:46 -0700 | [diff] [blame] | 112 | return TranslateLastOpenSslError(); |
Shawn Willden | f268d74 | 2014-08-19 15:36:26 -0600 | [diff] [blame] | 113 | |
| 114 | material->reset(new uint8_t[key_data_length]); |
| 115 | if (material->get() == NULL) |
| 116 | return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| 117 | |
| 118 | uint8_t* tmp = material->get(); |
| 119 | if (i2d_PUBKEY(pkey.get(), &tmp) != key_data_length) { |
| 120 | material->reset(); |
Shawn Willden | 567a4a0 | 2014-12-31 12:14:46 -0700 | [diff] [blame] | 121 | return TranslateLastOpenSslError(); |
Shawn Willden | f268d74 | 2014-08-19 15:36:26 -0600 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | *size = key_data_length; |
| 125 | return KM_ERROR_OK; |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 126 | } |
| 127 | |
Shawn Willden | d67afae | 2014-08-19 12:36:27 -0600 | [diff] [blame] | 128 | } // namespace keymaster |