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      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
    121