upload android base code part6

android/system/keymaster/rsa_key.cpp

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2014 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 "rsa_key.h"
+
+#include <keymaster/keymaster_context.h>
+
+#include "openssl_err.h"
+#include "openssl_utils.h"
+#include "rsa_operation.h"
+
+namespace keymaster {
+
+bool RsaKey::EvpToInternal(const EVP_PKEY* pkey) {
+    rsa_key_.reset(EVP_PKEY_get1_RSA(const_cast<EVP_PKEY*>(pkey)));
+    return rsa_key_.get() != NULL;
+}
+
+bool RsaKey::InternalToEvp(EVP_PKEY* pkey) const {
+    return EVP_PKEY_set1_RSA(pkey, rsa_key_.get()) == 1;
+}
+
+bool RsaKey::SupportedMode(keymaster_purpose_t purpose, keymaster_padding_t padding) {
+    switch (purpose) {
+    case KM_PURPOSE_SIGN:
+    case KM_PURPOSE_VERIFY:
+        return padding == KM_PAD_NONE || padding == KM_PAD_RSA_PSS ||
+               padding == KM_PAD_RSA_PKCS1_1_5_SIGN;
+
+    case KM_PURPOSE_ENCRYPT:
+    case KM_PURPOSE_DECRYPT:
+        return padding == KM_PAD_RSA_OAEP || padding == KM_PAD_RSA_PKCS1_1_5_ENCRYPT;
+
+    case KM_PURPOSE_DERIVE_KEY:
+        return false;
+    };
+    return false;
+}
+
+bool RsaKey::SupportedMode(keymaster_purpose_t purpose, keymaster_digest_t digest) {
+    switch (purpose) {
+    case KM_PURPOSE_SIGN:
+    case KM_PURPOSE_VERIFY:
+        return digest == KM_DIGEST_NONE || digest == KM_DIGEST_SHA_2_256;
+
+    case KM_PURPOSE_ENCRYPT:
+    case KM_PURPOSE_DECRYPT:
+        /* Don't care */
+        break;
+
+    case KM_PURPOSE_DERIVE_KEY:
+        return false;
+    };
+    return true;
+}
+
+}  // namespace keymaster