Shawn Willden | 0a4df7e | 2014-08-28 16:09:05 -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 | |
| 17 | #include <openssl/x509.h> |
| 18 | |
| 19 | #include <keymaster/key_blob.h> |
| 20 | |
| 21 | #include "asymmetric_key.h" |
| 22 | #include "openssl_utils.h" |
| 23 | |
| 24 | #include "key.h" |
| 25 | |
| 26 | namespace keymaster { |
| 27 | |
| 28 | struct PKCS8_PRIV_KEY_INFO_Delete { |
| 29 | void operator()(PKCS8_PRIV_KEY_INFO* p) const { PKCS8_PRIV_KEY_INFO_free(p); } |
| 30 | }; |
| 31 | |
| 32 | Key::Key(const KeyBlob& blob, const Logger& logger) : logger_(logger) { |
| 33 | authorizations_.push_back(blob.unenforced()); |
| 34 | authorizations_.push_back(blob.enforced()); |
| 35 | } |
| 36 | |
| 37 | /* static */ |
| 38 | Key* Key::CreateKey(const KeyBlob& blob, const Logger& logger, keymaster_error_t* error) { |
| 39 | switch (blob.algorithm()) { |
| 40 | case KM_ALGORITHM_RSA: |
| 41 | return new RsaKey(blob, logger, error); |
| 42 | case KM_ALGORITHM_DSA: |
| 43 | return new DsaKey(blob, logger, error); |
| 44 | case KM_ALGORITHM_ECDSA: |
| 45 | return new EcdsaKey(blob, logger, error); |
| 46 | default: |
| 47 | *error = KM_ERROR_UNSUPPORTED_ALGORITHM; |
| 48 | return NULL; |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | /* static */ |
| 53 | Key* Key::GenerateKey(const AuthorizationSet& key_description, const Logger& logger, |
| 54 | keymaster_error_t* error) { |
| 55 | keymaster_algorithm_t algorithm; |
| 56 | if (!key_description.GetTagValue(TAG_ALGORITHM, &algorithm)) { |
| 57 | *error = KM_ERROR_UNSUPPORTED_ALGORITHM; |
| 58 | return NULL; |
| 59 | } |
| 60 | |
| 61 | switch (algorithm) { |
| 62 | case KM_ALGORITHM_RSA: |
| 63 | return RsaKey::GenerateKey(key_description, logger, error); |
| 64 | case KM_ALGORITHM_DSA: |
| 65 | return DsaKey::GenerateKey(key_description, logger, error); |
| 66 | case KM_ALGORITHM_ECDSA: |
| 67 | return EcdsaKey::GenerateKey(key_description, logger, error); |
| 68 | default: |
| 69 | *error = KM_ERROR_UNSUPPORTED_ALGORITHM; |
| 70 | return NULL; |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | /* static */ |
| 75 | Key* Key::ImportKey(const AuthorizationSet& key_description, keymaster_key_format_t key_format, |
| 76 | const uint8_t* key_data, size_t key_data_length, const Logger& logger, |
| 77 | keymaster_error_t* error) { |
| 78 | *error = KM_ERROR_OK; |
| 79 | |
| 80 | if (key_data == NULL || key_data_length <= 0) { |
| 81 | *error = KM_ERROR_INVALID_KEY_BLOB; |
| 82 | return NULL; |
| 83 | } |
| 84 | |
| 85 | if (key_format != KM_KEY_FORMAT_PKCS8) { |
| 86 | *error = KM_ERROR_UNSUPPORTED_KEY_FORMAT; |
| 87 | return NULL; |
| 88 | } |
| 89 | |
| 90 | UniquePtr<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_Delete> pkcs8( |
| 91 | d2i_PKCS8_PRIV_KEY_INFO(NULL, &key_data, key_data_length)); |
| 92 | if (pkcs8.get() == NULL) { |
| 93 | *error = KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| 94 | return NULL; |
| 95 | } |
| 96 | |
| 97 | UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey(EVP_PKCS82PKEY(pkcs8.get())); |
| 98 | if (pkey.get() == NULL) { |
| 99 | *error = KM_ERROR_INVALID_KEY_BLOB; |
| 100 | return NULL; |
| 101 | } |
| 102 | |
| 103 | UniquePtr<Key> key; |
| 104 | switch (EVP_PKEY_type(pkey->type)) { |
| 105 | case EVP_PKEY_RSA: |
| 106 | return RsaKey::ImportKey(key_description, pkey.get(), logger, error); |
| 107 | case EVP_PKEY_DSA: |
| 108 | return DsaKey::ImportKey(key_description, pkey.get(), logger, error); |
| 109 | case EVP_PKEY_EC: |
| 110 | return EcdsaKey::ImportKey(key_description, pkey.get(), logger, error); |
| 111 | default: |
| 112 | *error = KM_ERROR_UNSUPPORTED_ALGORITHM; |
| 113 | return NULL; |
| 114 | } |
| 115 | |
| 116 | *error = KM_ERROR_UNIMPLEMENTED; |
| 117 | return NULL; |
| 118 | } |
| 119 | |
| 120 | } // namespace keymaster |