Merge "Identity Credential: Switch default implementation to use libeic." am: 8f4cc703f9 (c0d021c5) · Commits · e / os / android_hardware_interfaces

identity/aidl/default/Android.bp

+78 −7

Original line number	Diff line number	Diff line
		cc_library_static {
		name: "android.hardware.identity-libeic-hal-common",
		vendor_available: true,
		srcs: [
		"common/IdentityCredential.cpp",
		"common/IdentityCredentialStore.cpp",
		"common/WritableIdentityCredential.cpp",
		],
		export_include_dirs: [
		"common",
		],
		cflags: [
		"-Wall",
		"-Wextra",
		],
		shared_libs: [
		"liblog",
		"libcrypto",
		"libbinder_ndk",
		"libkeymaster_messages",
		],
		static_libs: [
		"libbase",
		"libcppbor",
		"libutils",
		"libsoft_attestation_cert",
		"libkeymaster_portable",
		"libsoft_attestation_cert",
		"libpuresoftkeymasterdevice",
		"android.hardware.identity-support-lib",
		"android.hardware.identity-ndk_platform",
		"android.hardware.keymaster-ndk_platform",
		],
		}

		cc_library_static {
		name: "android.hardware.identity-libeic-library",
		vendor_available: true,
		srcs: [
		"libeic/EicCbor.c",
		"libeic/EicPresentation.c",
		"libeic/EicProvisioning.c",
		"EicOpsImpl.cc",
		],
		export_include_dirs: [
		"libeic",
		],
		cflags: [
		"-DEIC_COMPILATION",
		"-Wall",
		"-Wextra",
		"-DEIC_DEBUG",
		// Allow using C2x extensions such as omitting parameter names
		"-Wno-c2x-extensions",
		],
		shared_libs: [
		"libbase",
		"libcrypto",
		],
		static_libs: [
		"android.hardware.identity-support-lib",
		],
		}

		cc_binary {
		name: "android.hardware.identity-service.example",
		relative_install_path: "hw",
		@@ -7,23 +71,30 @@ cc_binary {
		cflags: [
		"-Wall",
		"-Wextra",
		"-g",
		],
		shared_libs: [
		"libbase",
		"liblog",
		"libcrypto",
		"libbinder_ndk",
		"libkeymaster_messages",
		],
		static_libs: [
		"libbase",
		"libcppbor",
		"libcrypto",
		"liblog",
		"libutils",
		"libsoft_attestation_cert",
		"libkeymaster_portable",
		"libsoft_attestation_cert",
		"libpuresoftkeymasterdevice",
		"android.hardware.identity-support-lib",
		"android.hardware.identity-ndk_platform",
		"android.hardware.keymaster-ndk_platform",
		"android.hardware.identity-libeic-hal-common",
		"android.hardware.identity-libeic-library",
		],
		srcs: [
		"IdentityCredential.cpp",
		"IdentityCredentialStore.cpp",
		"WritableIdentityCredential.cpp",
		"Util.cpp",
		"service.cpp",
		"FakeSecureHardwareProxy.cpp",
		],
		}

identity/aidl/default/EicOpsImpl.cc

0 → 100644

+506 −0

Original line number	Diff line number	Diff line
		/*
		* 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.
		*/

		#define LOG_TAG "EicOpsImpl"

		#include <optional>
		#include <tuple>
		#include <vector>

		#include <android-base/logging.h>
		#include <android-base/stringprintf.h>
		#include <string.h>

		#include <android/hardware/identity/support/IdentityCredentialSupport.h>

		#include <openssl/sha.h>

		#include <openssl/aes.h>
		#include <openssl/bn.h>
		#include <openssl/crypto.h>
		#include <openssl/ec.h>
		#include <openssl/err.h>
		#include <openssl/evp.h>
		#include <openssl/hkdf.h>
		#include <openssl/hmac.h>
		#include <openssl/objects.h>
		#include <openssl/pem.h>
		#include <openssl/pkcs12.h>
		#include <openssl/rand.h>
		#include <openssl/x509.h>
		#include <openssl/x509_vfy.h>

		#include "EicOps.h"

		using ::std::optional;
		using ::std::string;
		using ::std::tuple;
		using ::std::vector;

		void* eicMemSet(void* s, int c, size_t n) {
		return memset(s, c, n);
		}

		void* eicMemCpy(void* dest, const void* src, size_t n) {
		return memcpy(dest, src, n);
		}

		size_t eicStrLen(const char* s) {
		return strlen(s);
		}

		int eicCryptoMemCmp(const void* s1, const void* s2, size_t n) {
		return CRYPTO_memcmp(s1, s2, n);
		}

		void eicOpsHmacSha256Init(EicHmacSha256Ctx* ctx, const uint8_t* key, size_t keySize) {
		HMAC_CTX* realCtx = (HMAC_CTX*)ctx;
		HMAC_CTX_init(realCtx);
		if (HMAC_Init_ex(realCtx, key, keySize, EVP_sha256(), nullptr /* impl */) != 1) {
		LOG(ERROR) << "Error initializing HMAC_CTX";
		}
		}

		void eicOpsHmacSha256Update(EicHmacSha256Ctx* ctx, const uint8_t* data, size_t len) {
		HMAC_CTX* realCtx = (HMAC_CTX*)ctx;
		if (HMAC_Update(realCtx, data, len) != 1) {
		LOG(ERROR) << "Error updating HMAC_CTX";
		}
		}

		void eicOpsHmacSha256Final(EicHmacSha256Ctx* ctx, uint8_t digest[EIC_SHA256_DIGEST_SIZE]) {
		HMAC_CTX* realCtx = (HMAC_CTX*)ctx;
		unsigned int size = 0;
		if (HMAC_Final(realCtx, digest, &size) != 1) {
		LOG(ERROR) << "Error finalizing HMAC_CTX";
		}
		if (size != EIC_SHA256_DIGEST_SIZE) {
		LOG(ERROR) << "Expected 32 bytes from HMAC_Final, got " << size;
		}
		}

		void eicOpsSha256Init(EicSha256Ctx* ctx) {
		SHA256_CTX* realCtx = (SHA256_CTX*)ctx;
		SHA256_Init(realCtx);
		}

		void eicOpsSha256Update(EicSha256Ctx* ctx, const uint8_t* data, size_t len) {
		SHA256_CTX* realCtx = (SHA256_CTX*)ctx;
		SHA256_Update(realCtx, data, len);
		}

		void eicOpsSha256Final(EicSha256Ctx* ctx, uint8_t digest[EIC_SHA256_DIGEST_SIZE]) {
		SHA256_CTX* realCtx = (SHA256_CTX*)ctx;
		SHA256_Final(digest, realCtx);
		}

		bool eicOpsRandom(uint8_t* buf, size_t numBytes) {
		optional<vector<uint8_t>> bytes = ::android::hardware::identity::support::getRandom(numBytes);
		if (!bytes.has_value()) {
		return false;
		}
		memcpy(buf, bytes.value().data(), numBytes);
		return true;
		}

		bool eicOpsEncryptAes128Gcm(
		const uint8_t* key, // Must be 16 bytes
		const uint8_t* nonce, // Must be 12 bytes
		const uint8_t* data, // May be NULL if size is 0
		size_t dataSize,
		const uint8_t* additionalAuthenticationData, // May be NULL if size is 0
		size_t additionalAuthenticationDataSize, uint8_t* encryptedData) {
		vector<uint8_t> cppKey;
		cppKey.resize(16);
		memcpy(cppKey.data(), key, 16);

		vector<uint8_t> cppData;
		cppData.resize(dataSize);
		if (dataSize > 0) {
		memcpy(cppData.data(), data, dataSize);
		}

		vector<uint8_t> cppAAD;
		cppAAD.resize(additionalAuthenticationDataSize);
		if (additionalAuthenticationDataSize > 0) {
		memcpy(cppAAD.data(), additionalAuthenticationData, additionalAuthenticationDataSize);
		}

		vector<uint8_t> cppNonce;
		cppNonce.resize(12);
		memcpy(cppNonce.data(), nonce, 12);

		optional<vector<uint8_t>> cppEncryptedData =
		android::hardware::identity::support::encryptAes128Gcm(cppKey, cppNonce, cppData,
		cppAAD);
		if (!cppEncryptedData.has_value()) {
		return false;
		}

		memcpy(encryptedData, cppEncryptedData.value().data(), cppEncryptedData.value().size());
		return true;
		}

		// Decrypts \|encryptedData\| using \|key\| and \|additionalAuthenticatedData\|,
		// returns resulting plaintext in \|data\| must be of size \|encryptedDataSize\| - 28.
		//
		// The format of \|encryptedData\| must be as specified in the
		// encryptAes128Gcm() function.
		bool eicOpsDecryptAes128Gcm(const uint8_t* key, // Must be 16 bytes
		const uint8_t* encryptedData, size_t encryptedDataSize,
		const uint8_t* additionalAuthenticationData,
		size_t additionalAuthenticationDataSize, uint8_t* data) {
		vector<uint8_t> keyVec;
		keyVec.resize(16);
		memcpy(keyVec.data(), key, 16);

		vector<uint8_t> encryptedDataVec;
		encryptedDataVec.resize(encryptedDataSize);
		if (encryptedDataSize > 0) {
		memcpy(encryptedDataVec.data(), encryptedData, encryptedDataSize);
		}

		vector<uint8_t> aadVec;
		aadVec.resize(additionalAuthenticationDataSize);
		if (additionalAuthenticationDataSize > 0) {
		memcpy(aadVec.data(), additionalAuthenticationData, additionalAuthenticationDataSize);
		}

		optional<vector<uint8_t>> decryptedDataVec =
		android::hardware::identity::support::decryptAes128Gcm(keyVec, encryptedDataVec,
		aadVec);
		if (!decryptedDataVec.has_value()) {
		eicDebug("Error decrypting data");
		return false;
		}
		if (decryptedDataVec.value().size() != encryptedDataSize - 28) {
		eicDebug("Decrypted data is size %zd, expected %zd", decryptedDataVec.value().size(),
		encryptedDataSize - 28);
		return false;
		}

		if (decryptedDataVec.value().size() > 0) {
		memcpy(data, decryptedDataVec.value().data(), decryptedDataVec.value().size());
		}
		return true;
		}

		bool eicOpsCreateEcKey(uint8_t privateKey[EIC_P256_PRIV_KEY_SIZE],
		uint8_t publicKey[EIC_P256_PUB_KEY_SIZE]) {
		optional<vector<uint8_t>> keyPair = android::hardware::identity::support::createEcKeyPair();
		if (!keyPair) {
		eicDebug("Error creating EC keypair");
		return false;
		}
		optional<vector<uint8_t>> privKey =
		android::hardware::identity::support::ecKeyPairGetPrivateKey(keyPair.value());
		if (!privKey) {
		eicDebug("Error extracting private key");
		return false;
		}
		if (privKey.value().size() != EIC_P256_PRIV_KEY_SIZE) {
		eicDebug("Private key is not %zd bytes long as expected", (size_t)EIC_P256_PRIV_KEY_SIZE);
		return false;
		}

		optional<vector<uint8_t>> pubKey =
		android::hardware::identity::support::ecKeyPairGetPublicKey(keyPair.value());
		if (!pubKey) {
		eicDebug("Error extracting public key");
		return false;
		}
		// ecKeyPairGetPublicKey() returns 0x04 \| x \| y, we don't want the leading 0x04.
		if (pubKey.value().size() != EIC_P256_PUB_KEY_SIZE + 1) {
		eicDebug("Private key is %zd bytes long, expected %zd", pubKey.value().size(),
		(size_t)EIC_P256_PRIV_KEY_SIZE + 1);
		return false;
		}

		memcpy(privateKey, privKey.value().data(), EIC_P256_PRIV_KEY_SIZE);
		memcpy(publicKey, pubKey.value().data() + 1, EIC_P256_PUB_KEY_SIZE);

		return true;
		}

		bool eicOpsCreateCredentialKey(uint8_t privateKey[EIC_P256_PRIV_KEY_SIZE], const uint8_t* challenge,
		size_t challengeSize, const uint8_t* applicationId,
		size_t applicationIdSize, bool testCredential, uint8_t* cert,
		size_t* certSize) {
		vector<uint8_t> challengeVec(challengeSize);
		memcpy(challengeVec.data(), challenge, challengeSize);

		vector<uint8_t> applicationIdVec(applicationIdSize);
		memcpy(applicationIdVec.data(), applicationId, applicationIdSize);

		optional<std::pair<vector<uint8_t>, vector<vector<uint8_t>>>> ret =
		android::hardware::identity::support::createEcKeyPairAndAttestation(
		challengeVec, applicationIdVec, testCredential);
		if (!ret) {
		eicDebug("Error generating CredentialKey and attestation");
		return false;
		}

		// Extract certificate chain.
		vector<uint8_t> flatChain =
		android::hardware::identity::support::certificateChainJoin(ret.value().second);
		if (*certSize < flatChain.size()) {
		eicDebug("Buffer for certificate is only %zd bytes long, need %zd bytes", *certSize,
		flatChain.size());
		return false;
		}
		memcpy(cert, flatChain.data(), flatChain.size());
		*certSize = flatChain.size();

		// Extract private key.
		optional<vector<uint8_t>> privKey =
		android::hardware::identity::support::ecKeyPairGetPrivateKey(ret.value().first);
		if (!privKey) {
		eicDebug("Error extracting private key");
		return false;
		}
		if (privKey.value().size() != EIC_P256_PRIV_KEY_SIZE) {
		eicDebug("Private key is not %zd bytes long as expected", (size_t)EIC_P256_PRIV_KEY_SIZE);
		return false;
		}

		memcpy(privateKey, privKey.value().data(), EIC_P256_PRIV_KEY_SIZE);

		return true;
		}

		bool eicOpsSignEcKey(const uint8_t publicKey[EIC_P256_PUB_KEY_SIZE],
		const uint8_t signingKey[EIC_P256_PRIV_KEY_SIZE], unsigned int serial,
		const char* issuerName, const char* subjectName, time_t validityNotBefore,
		time_t validityNotAfter, uint8_t* cert,
		size_t* certSize) { // inout
		vector<uint8_t> signingKeyVec(EIC_P256_PRIV_KEY_SIZE);
		memcpy(signingKeyVec.data(), signingKey, EIC_P256_PRIV_KEY_SIZE);

		vector<uint8_t> pubKeyVec(EIC_P256_PUB_KEY_SIZE + 1);
		pubKeyVec[0] = 0x04;
		memcpy(pubKeyVec.data() + 1, publicKey, EIC_P256_PUB_KEY_SIZE);

		std::string serialDecimal = android::base::StringPrintf("%d", serial);

		optional<vector<uint8_t>> certVec =
		android::hardware::identity::support::ecPublicKeyGenerateCertificate(
		pubKeyVec, signingKeyVec, serialDecimal, issuerName, subjectName,
		validityNotBefore, validityNotAfter);
		if (!certVec) {
		eicDebug("Error generating certificate");
		return false;
		}

		if (*certSize < certVec.value().size()) {
		eicDebug("Buffer for certificate is only %zd bytes long, need %zd bytes", *certSize,
		certVec.value().size());
		return false;
		}
		memcpy(cert, certVec.value().data(), certVec.value().size());
		*certSize = certVec.value().size();

		return true;
		}

		bool eicOpsEcDsa(const uint8_t privateKey[EIC_P256_PRIV_KEY_SIZE],
		const uint8_t digestOfData[EIC_SHA256_DIGEST_SIZE],
		uint8_t signature[EIC_ECDSA_P256_SIGNATURE_SIZE]) {
		vector<uint8_t> privKeyVec(EIC_P256_PRIV_KEY_SIZE);
		memcpy(privKeyVec.data(), privateKey, EIC_P256_PRIV_KEY_SIZE);

		vector<uint8_t> digestVec(EIC_SHA256_DIGEST_SIZE);
		memcpy(digestVec.data(), digestOfData, EIC_SHA256_DIGEST_SIZE);

		optional<vector<uint8_t>> derSignature =
		android::hardware::identity::support::signEcDsaDigest(privKeyVec, digestVec);
		if (!derSignature) {
		eicDebug("Error signing data");
		return false;
		}

		ECDSA_SIG* sig;
		const unsigned char* p = derSignature.value().data();
		sig = d2i_ECDSA_SIG(nullptr, &p, derSignature.value().size());
		if (sig == nullptr) {
		eicDebug("Error decoding DER signature");
		return false;
		}

		if (BN_bn2binpad(sig->r, signature, 32) != 32) {
		eicDebug("Error encoding r");
		return false;
		}
		if (BN_bn2binpad(sig->s, signature + 32, 32) != 32) {
		eicDebug("Error encoding s");
		return false;
		}

		return true;
		}

		static const uint8_t hbkTest[16] = {0};
		static const uint8_t hbkReal[16] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};

		const uint8_t* eicOpsGetHardwareBoundKey(bool testCredential) {
		if (testCredential) {
		return hbkTest;
		}
		return hbkReal;
		}

		bool eicOpsValidateAuthToken(uint64_t /* challenge /, uint64_t / secureUserId */,
		uint64_t /* authenticatorId /, int / hardwareAuthenticatorType */,
		uint64_t /* timeStamp /, const uint8_t /* mac */,
		size_t /* macSize /, uint64_t / verificationTokenChallenge */,
		uint64_t /* verificationTokenTimeStamp */,
		int /* verificationTokenSecurityLevel */,
		const uint8_t* /* verificationTokenMac */,
		size_t /* verificationTokenMacSize */) {
		// Here's where we would validate the passed-in \|authToken\| to assure ourselves
		// that it comes from the e.g. biometric hardware and wasn't made up by an attacker.
		//
		// However this involves calculating the MAC which requires access to the to
		// a pre-shared key which we don't have...
		//
		return true;
		}

		bool eicOpsX509GetPublicKey(const uint8_t* x509Cert, size_t x509CertSize, uint8_t* publicKey,
		size_t* publicKeySize) {
		vector<uint8_t> chain;
		chain.resize(x509CertSize);
		memcpy(chain.data(), x509Cert, x509CertSize);
		optional<vector<uint8_t>> res =
		android::hardware::identity::support::certificateChainGetTopMostKey(chain);
		if (!res) {
		return false;
		}
		if (res.value().size() > *publicKeySize) {
		eicDebug("Public key size is %zd but buffer only has room for %zd bytes",
		res.value().size(), *publicKeySize);
		return false;
		}
		*publicKeySize = res.value().size();
		memcpy(publicKey, res.value().data(), *publicKeySize);
		eicDebug("Extracted %zd bytes public key from %zd bytes X.509 cert", *publicKeySize,
		x509CertSize);
		return true;
		}

		bool eicOpsX509CertSignedByPublicKey(const uint8_t* x509Cert, size_t x509CertSize,
		const uint8_t* publicKey, size_t publicKeySize) {
		vector<uint8_t> certVec(x509Cert, x509Cert + x509CertSize);
		vector<uint8_t> publicKeyVec(publicKey, publicKey + publicKeySize);
		return android::hardware::identity::support::certificateSignedByPublicKey(certVec,
		publicKeyVec);
		}

		bool eicOpsEcDsaVerifyWithPublicKey(const uint8_t* digest, size_t digestSize,
		const uint8_t* signature, size_t signatureSize,
		const uint8_t* publicKey, size_t publicKeySize) {
		vector<uint8_t> digestVec(digest, digest + digestSize);
		vector<uint8_t> signatureVec(signature, signature + signatureSize);
		vector<uint8_t> publicKeyVec(publicKey, publicKey + publicKeySize);

		vector<uint8_t> derSignature;
		if (!android::hardware::identity::support::ecdsaSignatureCoseToDer(signatureVec,
		derSignature)) {
		LOG(ERROR) << "Error convering signature to DER format";
		return false;
		}

		if (!android::hardware::identity::support::checkEcDsaSignature(digestVec, derSignature,
		publicKeyVec)) {
		LOG(ERROR) << "Signature check failed";
		return false;
		}
		return true;
		}

		bool eicOpsEcdh(const uint8_t publicKey[EIC_P256_PUB_KEY_SIZE],
		const uint8_t privateKey[EIC_P256_PUB_KEY_SIZE],
		uint8_t sharedSecret[EIC_P256_COORDINATE_SIZE]) {
		vector<uint8_t> pubKeyVec(EIC_P256_PUB_KEY_SIZE + 1);
		pubKeyVec[0] = 0x04;
		memcpy(pubKeyVec.data() + 1, publicKey, EIC_P256_PUB_KEY_SIZE);

		vector<uint8_t> privKeyVec(EIC_P256_PRIV_KEY_SIZE);
		memcpy(privKeyVec.data(), privateKey, EIC_P256_PRIV_KEY_SIZE);

		optional<vector<uint8_t>> shared =
		android::hardware::identity::support::ecdh(pubKeyVec, privKeyVec);
		if (!shared) {
		LOG(ERROR) << "Error performing ECDH";
		return false;
		}
		if (shared.value().size() != EIC_P256_COORDINATE_SIZE) {
		LOG(ERROR) << "Unexpected size of shared secret " << shared.value().size() << " expected "
		<< EIC_P256_COORDINATE_SIZE << " bytes";
		return false;
		}
		memcpy(sharedSecret, shared.value().data(), EIC_P256_COORDINATE_SIZE);
		return true;
		}

		bool eicOpsHkdf(const uint8_t* sharedSecret, size_t sharedSecretSize, const uint8_t* salt,
		size_t saltSize, const uint8_t* info, size_t infoSize, uint8_t* output,
		size_t outputSize) {
		vector<uint8_t> sharedSecretVec(sharedSecretSize);
		memcpy(sharedSecretVec.data(), sharedSecret, sharedSecretSize);
		vector<uint8_t> saltVec(saltSize);
		memcpy(saltVec.data(), salt, saltSize);
		vector<uint8_t> infoVec(infoSize);
		memcpy(infoVec.data(), info, infoSize);

		optional<vector<uint8_t>> result = android::hardware::identity::support::hkdf(
		sharedSecretVec, saltVec, infoVec, outputSize);
		if (!result) {
		LOG(ERROR) << "Error performing HKDF";
		return false;
		}
		if (result.value().size() != outputSize) {
		LOG(ERROR) << "Unexpected size of HKDF " << result.value().size() << " expected "
		<< outputSize;
		return false;
		}
		memcpy(output, result.value().data(), outputSize);
		return true;
		}

		#ifdef EIC_DEBUG

		void eicPrint(const char* format, ...) {
		va_list args;
		va_start(args, format);
		vfprintf(stderr, format, args);
		va_end(args);
		}

		void eicHexdump(const char* message, const uint8_t* data, size_t dataSize) {
		vector<uint8_t> dataVec(dataSize);
		memcpy(dataVec.data(), data, dataSize);
		android::hardware::identity::support::hexdump(message, dataVec);
		}

		void eicCborPrettyPrint(const uint8_t* cborData, size_t cborDataSize, size_t maxBStrSize) {
		vector<uint8_t> cborDataVec(cborDataSize);
		memcpy(cborDataVec.data(), cborData, cborDataSize);
		string str =
		android::hardware::identity::support::cborPrettyPrint(cborDataVec, maxBStrSize, {});
		fprintf(stderr, "%s\n", str.c_str());
		}

		#endif // EIC_DEBUG

identity/aidl/default/EicOpsImpl.h

0 → 100644

+46 −0

Original line number	Diff line number	Diff line
		/*
		* 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.
		*/

		#ifndef ANDROID_HARDWARE_IDENTITY_EIC_OPS_IMPL_H
		#define ANDROID_HARDWARE_IDENTITY_EIC_OPS_IMPL_H

		#include <stdbool.h>
		#include <stddef.h>
		#include <stdlib.h>

		// Add whatever includes are needed for definitions below.
		//

		#include <openssl/hmac.h>
		#include <openssl/sha.h>

		#ifdef __cplusplus
		extern "C" {
		#endif

		// Set the following defines to match the implementation of the supplied
		// eicOps*() operations. See EicOps.h for details.
		//

		#define EIC_SHA256_CONTEXT_SIZE sizeof(SHA256_CTX)

		#define EIC_HMAC_SHA256_CONTEXT_SIZE sizeof(HMAC_CTX)

		#ifdef __cplusplus
		}
		#endif

		#endif // ANDROID_HARDWARE_IDENTITY_EMBEDDED_IC_H

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