upload android base code part6

android/system/keymaster/openssl_utils.cpp

@@ -0,0 +1,136 @@
+/*
+ * Copyright 2015 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 "openssl_utils.h"
+
+#include <keymaster/android_keymaster_utils.h>
+
+#include "openssl_err.h"
+
+namespace keymaster {
+
+keymaster_error_t ec_get_group_size(const EC_GROUP* group, size_t* key_size_bits) {
+    switch (EC_GROUP_get_curve_name(group)) {
+    case NID_secp224r1:
+        *key_size_bits = 224;
+        break;
+    case NID_X9_62_prime256v1:
+        *key_size_bits = 256;
+        break;
+    case NID_secp384r1:
+        *key_size_bits = 384;
+        break;
+    case NID_secp521r1:
+        *key_size_bits = 521;
+        break;
+    default:
+        return KM_ERROR_UNSUPPORTED_EC_FIELD;
+    }
+    return KM_ERROR_OK;
+}
+
+EC_GROUP* ec_get_group(keymaster_ec_curve_t curve) {
+    switch (curve) {
+    case KM_EC_CURVE_P_224:
+        return EC_GROUP_new_by_curve_name(NID_secp224r1);
+        break;
+    case KM_EC_CURVE_P_256:
+        return EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1);
+        break;
+    case KM_EC_CURVE_P_384:
+        return EC_GROUP_new_by_curve_name(NID_secp384r1);
+        break;
+    case KM_EC_CURVE_P_521:
+        return EC_GROUP_new_by_curve_name(NID_secp521r1);
+        break;
+    default:
+        return nullptr;
+        break;
+    }
+}
+
+static int convert_to_evp(keymaster_algorithm_t algorithm) {
+    switch (algorithm) {
+    case KM_ALGORITHM_RSA:
+        return EVP_PKEY_RSA;
+    case KM_ALGORITHM_EC:
+        return EVP_PKEY_EC;
+    default:
+        return -1;
+    };
+}
+
+keymaster_error_t convert_pkcs8_blob_to_evp(const uint8_t* key_data, size_t key_length,
+                                            keymaster_algorithm_t expected_algorithm,
+                                            UniquePtr<EVP_PKEY, EVP_PKEY_Delete>* pkey) {
+    if (key_data == NULL || key_length <= 0)
+        return KM_ERROR_INVALID_KEY_BLOB;
+
+    UniquePtr<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_Delete> pkcs8(
+        d2i_PKCS8_PRIV_KEY_INFO(NULL, &key_data, key_length));
+    if (pkcs8.get() == NULL)
+        return TranslateLastOpenSslError(true /* log_message */);
+
+    pkey->reset(EVP_PKCS82PKEY(pkcs8.get()));
+    if (!pkey->get())
+        return TranslateLastOpenSslError(true /* log_message */);
+
+    if (EVP_PKEY_type((*pkey)->type) != convert_to_evp(expected_algorithm)) {
+        LOG_E("EVP key algorithm was %d, not the expected %d", EVP_PKEY_type((*pkey)->type),
+              convert_to_evp(expected_algorithm));
+        return KM_ERROR_INVALID_KEY_BLOB;
+    }
+
+    return KM_ERROR_OK;
+}
+
+keymaster_error_t KeyMaterialToEvpKey(keymaster_key_format_t key_format,
+                                      const KeymasterKeyBlob& key_material,
+                                      keymaster_algorithm_t expected_algorithm,
+                                      UniquePtr<EVP_PKEY, EVP_PKEY_Delete>* pkey) {
+    if (key_format != KM_KEY_FORMAT_PKCS8)
+        return KM_ERROR_UNSUPPORTED_KEY_FORMAT;
+
+    return convert_pkcs8_blob_to_evp(key_material.key_material, key_material.key_material_size,
+                                     expected_algorithm, pkey);
+}
+
+keymaster_error_t EvpKeyToKeyMaterial(const EVP_PKEY* pkey, KeymasterKeyBlob* key_blob) {
+    int key_data_size = i2d_PrivateKey(pkey, NULL /* key_data*/);
+    if (key_data_size <= 0)
+        return TranslateLastOpenSslError();
+
+    if (!key_blob->Reset(key_data_size))
+        return KM_ERROR_MEMORY_ALLOCATION_FAILED;
+
+    uint8_t* tmp = key_blob->writable_data();
+    i2d_PrivateKey(pkey, &tmp);
+
+    return KM_ERROR_OK;
+}
+
+size_t ec_group_size_bits(EC_KEY* ec_key) {
+    const EC_GROUP* group = EC_KEY_get0_group(ec_key);
+    UniquePtr<BN_CTX, BN_CTX_Delete> bn_ctx(BN_CTX_new());
+    UniquePtr<BIGNUM, BIGNUM_Delete> order(BN_new());
+    if (!EC_GROUP_get_order(group, order.get(), bn_ctx.get())) {
+        LOG_E("Failed to get EC group order", 0);
+        return 0;
+    }
+    return BN_num_bits(order.get());
+}
+
+}  // namespace keymaster