Identity Credential: Switch default implementation to use libeic.
Introduce platform-neutral C library ("libeic") which can be used to
implement an Identity Credential Trusted Application/Applet in Secure
Hardware.
The libeic library is intentionally low-level, has no dependencies
(not even libc), uses very little run-time memory (less than 500 bytes
during a provisioning or presentation session), and doesn't
dynamically allocate any memory. Crypto routines are provided by the
library user through a simple crypto interface defined in EicOps.
Also provide an Android-side HAL implementation designed to
communicate with libeic running in Secure Hardware outside
Android. Abstract out communications between HAL and TA in a couple of
SecureHardwareProxy* classes which mimic libeic 1:1.
The default implementation of the HAL is a combination of the
aforementioned HAL using libeic in-process backed by BoringSSL for the
crypto bits.
Test: atest VtsHalIdentityTargetTest
Test: atest android.security.identity.cts
Bug: 170146643
Change-Id: I3bf43fa7fd9362f94023052591801f2094a04607
diff --git a/identity/aidl/default/libeic/EicProvisioning.h b/identity/aidl/default/libeic/EicProvisioning.h
new file mode 100644
index 0000000..836d16e
--- /dev/null
+++ b/identity/aidl/default/libeic/EicProvisioning.h
@@ -0,0 +1,123 @@
+/*
+ * Copyright 2020, 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.
+ */
+
+#if !defined(EIC_INSIDE_LIBEIC_H) && !defined(EIC_COMPILATION)
+#error "Never include this file directly, include libeic.h instead."
+#endif
+
+#ifndef ANDROID_HARDWARE_IDENTITY_EIC_PROVISIONING_H
+#define ANDROID_HARDWARE_IDENTITY_EIC_PROVISIONING_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "EicCbor.h"
+
+#define EIC_MAX_NUM_NAMESPACES 32
+#define EIC_MAX_NUM_ACCESS_CONTROL_PROFILE_IDS 32
+
+typedef struct {
+ // Set by eicCreateCredentialKey.
+ uint8_t credentialPrivateKey[EIC_P256_PRIV_KEY_SIZE];
+
+ int numEntryCounts;
+ uint8_t entryCounts[EIC_MAX_NUM_NAMESPACES];
+
+ int curNamespace;
+ int curNamespaceNumProcessed;
+
+ size_t curEntrySize;
+ size_t curEntryNumBytesReceived;
+
+ uint8_t storageKey[EIC_AES_128_KEY_SIZE];
+
+ size_t expectedCborSizeAtEnd;
+
+ // SHA-256 for AdditionalData, updated for each entry.
+ uint8_t additionalDataSha256[EIC_SHA256_DIGEST_SIZE];
+
+ EicCbor cbor;
+
+ bool testCredential;
+} EicProvisioning;
+
+bool eicProvisioningInit(EicProvisioning* ctx, bool testCredential);
+
+bool eicProvisioningCreateCredentialKey(EicProvisioning* ctx, const uint8_t* challenge,
+ size_t challengeSize, const uint8_t* applicationId,
+ size_t applicationIdSize, uint8_t* publicKeyCert,
+ size_t* publicKeyCertSize);
+
+bool eicProvisioningStartPersonalization(EicProvisioning* ctx, int accessControlProfileCount,
+ const int* entryCounts, size_t numEntryCounts,
+ const char* docType,
+ size_t expectedProofOfProvisioningingSize);
+
+bool eicProvisioningAddAccessControlProfile(EicProvisioning* ctx, int id,
+ const uint8_t* readerCertificate,
+ size_t readerCertificateSize,
+ bool userAuthenticationRequired, uint64_t timeoutMillis,
+ uint64_t secureUserId, uint8_t outMac[28]);
+
+// The scratchSpace should be set to a buffer at least 512 bytes. It's done this way to
+// avoid allocating stack space.
+//
+bool eicProvisioningBeginAddEntry(EicProvisioning* ctx, const int* accessControlProfileIds,
+ size_t numAccessControlProfileIds, const char* nameSpace,
+ const char* name, uint64_t entrySize, uint8_t* scratchSpace,
+ size_t scratchSpaceSize);
+
+// The outEncryptedContent array must be contentSize + 28 bytes long.
+//
+// The scratchSpace should be set to a buffer at least 512 bytes. It's done this way to
+// avoid allocating stack space.
+//
+bool eicProvisioningAddEntryValue(EicProvisioning* ctx, const int* accessControlProfileIds,
+ size_t numAccessControlProfileIds, const char* nameSpace,
+ const char* name, const uint8_t* content, size_t contentSize,
+ uint8_t* outEncryptedContent, uint8_t* scratchSpace,
+ size_t scratchSpaceSize);
+
+// The data returned in |signatureOfToBeSigned| contains the ECDSA signature of
+// the ToBeSigned CBOR from RFC 8051 "4.4. Signing and Verification Process"
+// where content is set to the ProofOfProvisioninging CBOR.
+//
+bool eicProvisioningFinishAddingEntries(
+ EicProvisioning* ctx, uint8_t signatureOfToBeSigned[EIC_ECDSA_P256_SIGNATURE_SIZE]);
+
+//
+//
+// The |encryptedCredentialKeys| array is set to AES-GCM-ENC(HBK, R, CredentialKeys, docType)
+// where
+//
+// CredentialKeys = [
+// bstr, ; storageKey, a 128-bit AES key
+// bstr ; credentialPrivKey, the private key for credentialKey
+// ]
+//
+// Since |storageKey| is 16 bytes and |credentialPrivKey| is 32 bytes, the
+// encoded CBOR for CredentialKeys is 52 bytes and consequently
+// |encryptedCredentialKeys| will be 52 + 28 = 80 bytes.
+//
+bool eicProvisioningFinishGetCredentialData(EicProvisioning* ctx, const char* docType,
+ uint8_t encryptedCredentialKeys[80]);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // ANDROID_HARDWARE_IDENTITY_EIC_PROVISIONING_H