diff --git a/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp b/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp
index 829780d..f154d03 100644
--- a/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp
+++ b/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp
@@ -169,6 +169,7 @@
             provisionable_ = IRemotelyProvisionedComponent::fromBinder(binder);
         }
         ASSERT_NE(provisionable_, nullptr);
+        ASSERT_TRUE(provisionable_->getHardwareInfo(&rpcHardwareInfo).isOk());
     }
 
     static vector<string> build_params() {
@@ -178,6 +179,7 @@
 
   protected:
     std::shared_ptr<IRemotelyProvisionedComponent> provisionable_;
+    RpcHardwareInfo rpcHardwareInfo;
 };
 
 /**
@@ -341,11 +343,10 @@
 class CertificateRequestTest : public VtsRemotelyProvisionedComponentTests {
   protected:
     CertificateRequestTest() : eekId_(string_to_bytevec("eekid")), challenge_(randomBytes(32)) {
-        generateTestEekChain(3);
     }
 
     void generateTestEekChain(size_t eekLength) {
-        auto chain = generateEekChain(eekLength, eekId_);
+        auto chain = generateEekChain(rpcHardwareInfo.supportedEekCurve, eekLength, eekId_);
         EXPECT_TRUE(chain) << chain.message();
         if (chain) testEekChain_ = chain.moveValue();
         testEekLength_ = eekLength;
@@ -366,6 +367,17 @@
         }
     }
 
+    ErrMsgOr<bytevec> getSessionKey(ErrMsgOr<std::pair<bytevec, bytevec>>& senderPubkey) {
+        if (rpcHardwareInfo.supportedEekCurve == RpcHardwareInfo::CURVE_25519 ||
+            rpcHardwareInfo.supportedEekCurve == RpcHardwareInfo::CURVE_NONE) {
+            return x25519_HKDF_DeriveKey(testEekChain_.last_pubkey, testEekChain_.last_privkey,
+                                         senderPubkey->first, false /* senderIsA */);
+        } else {
+            return ECDH_HKDF_DeriveKey(testEekChain_.last_pubkey, testEekChain_.last_privkey,
+                                       senderPubkey->first, false /* senderIsA */);
+        }
+    }
+
     void checkProtectedData(const DeviceInfo& deviceInfo, const cppbor::Array& keysToSign,
                             const bytevec& keysToSignMac, const ProtectedData& protectedData,
                             std::vector<BccEntryData>* bccOutput = nullptr) {
@@ -378,9 +390,7 @@
         ASSERT_TRUE(senderPubkey) << senderPubkey.message();
         EXPECT_EQ(senderPubkey->second, eekId_);
 
-        auto sessionKey =
-                x25519_HKDF_DeriveKey(testEekChain_.last_pubkey, testEekChain_.last_privkey,
-                                      senderPubkey->first, false /* senderIsA */);
+        auto sessionKey = getSessionKey(senderPubkey);
         ASSERT_TRUE(sessionKey) << sessionKey.message();
 
         auto protectedDataPayload =
@@ -390,7 +400,8 @@
         auto [parsedPayload, __, payloadErrMsg] = cppbor::parse(*protectedDataPayload);
         ASSERT_TRUE(parsedPayload) << "Failed to parse payload: " << payloadErrMsg;
         ASSERT_TRUE(parsedPayload->asArray());
-        EXPECT_EQ(parsedPayload->asArray()->size(), 2U);
+        // Strongbox may contain additional certificate chain.
+        EXPECT_LE(parsedPayload->asArray()->size(), 3U);
 
         auto& signedMac = parsedPayload->asArray()->get(0);
         auto& bcc = parsedPayload->asArray()->get(1);
@@ -474,6 +485,7 @@
     bytevec keysToSignMac;
     DeviceInfo deviceInfo;
     ProtectedData protectedData;
+    generateTestEekChain(3);
     auto status = provisionable_->generateCertificateRequest(
             testMode, {} /* keysToSign */, testEekChain_.chain, challenge_, &deviceInfo,
             &protectedData, &keysToSignMac);
@@ -513,8 +525,8 @@
     DeviceInfo deviceInfo;
     ProtectedData protectedData;
     auto status = provisionable_->generateCertificateRequest(
-            testMode, {} /* keysToSign */, getProdEekChain(), challenge_, &deviceInfo,
-            &protectedData, &keysToSignMac);
+            testMode, {} /* keysToSign */, getProdEekChain(rpcHardwareInfo.supportedEekCurve),
+            challenge_, &deviceInfo, &protectedData, &keysToSignMac);
     EXPECT_TRUE(status.isOk());
 }
 
@@ -554,8 +566,8 @@
     DeviceInfo deviceInfo;
     ProtectedData protectedData;
     auto status = provisionable_->generateCertificateRequest(
-            testMode, keysToSign_, getProdEekChain(), challenge_, &deviceInfo, &protectedData,
-            &keysToSignMac);
+            testMode, keysToSign_, getProdEekChain(rpcHardwareInfo.supportedEekCurve), challenge_,
+            &deviceInfo, &protectedData, &keysToSignMac);
     EXPECT_TRUE(status.isOk());
 }
 
@@ -570,6 +582,7 @@
     bytevec keysToSignMac;
     DeviceInfo deviceInfo;
     ProtectedData protectedData;
+    generateTestEekChain(3);
     auto status = provisionable_->generateCertificateRequest(
             testMode, {keyWithCorruptMac}, testEekChain_.chain, challenge_, &deviceInfo,
             &protectedData, &keysToSignMac);
@@ -589,8 +602,8 @@
     DeviceInfo deviceInfo;
     ProtectedData protectedData;
     auto status = provisionable_->generateCertificateRequest(
-            testMode, {keyWithCorruptMac}, getProdEekChain(), challenge_, &deviceInfo,
-            &protectedData, &keysToSignMac);
+            testMode, {keyWithCorruptMac}, getProdEekChain(rpcHardwareInfo.supportedEekCurve),
+            challenge_, &deviceInfo, &protectedData, &keysToSignMac);
     ASSERT_FALSE(status.isOk()) << status.getMessage();
     EXPECT_EQ(status.getServiceSpecificError(), BnRemotelyProvisionedComponent::STATUS_INVALID_MAC);
 }
@@ -603,7 +616,7 @@
     bool testMode = false;
     generateKeys(testMode, 4 /* numKeys */);
 
-    auto prodEekChain = getProdEekChain();
+    auto prodEekChain = getProdEekChain(rpcHardwareInfo.supportedEekCurve);
     auto [parsedChain, _, parseErr] = cppbor::parse(prodEekChain);
     ASSERT_NE(parsedChain, nullptr) << parseErr;
     ASSERT_NE(parsedChain->asArray(), nullptr);
@@ -634,7 +647,7 @@
 
     // Build an EEK chain that omits the first self-signed cert.
     auto truncatedChain = cppbor::Array();
-    auto [chain, _, parseErr] = cppbor::parse(getProdEekChain());
+    auto [chain, _, parseErr] = cppbor::parse(getProdEekChain(rpcHardwareInfo.supportedEekCurve));
     ASSERT_TRUE(chain);
     auto eekChain = chain->asArray();
     ASSERT_NE(eekChain, nullptr);
@@ -662,6 +675,7 @@
     bytevec keysToSignMac;
     DeviceInfo deviceInfo;
     ProtectedData protectedData;
+    generateTestEekChain(3);
     auto status = provisionable_->generateCertificateRequest(
             true /* testMode */, keysToSign_, testEekChain_.chain, challenge_, &deviceInfo,
             &protectedData, &keysToSignMac);
@@ -680,6 +694,7 @@
     bytevec keysToSignMac;
     DeviceInfo deviceInfo;
     ProtectedData protectedData;
+    generateTestEekChain(3);
     auto status = provisionable_->generateCertificateRequest(
             false /* testMode */, keysToSign_, testEekChain_.chain, challenge_, &deviceInfo,
             &protectedData, &keysToSignMac);
diff --git a/security/keymint/support/Android.bp b/security/keymint/support/Android.bp
index 36969bb..bf2ab02 100644
--- a/security/keymint/support/Android.bp
+++ b/security/keymint/support/Android.bp
@@ -60,11 +60,15 @@
     export_include_dirs: [
         "include",
     ],
+    defaults: [
+        "keymint_use_latest_hal_aidl_ndk_shared",
+    ],
     shared_libs: [
         "libbase",
         "libcppbor_external",
         "libcppcose_rkp",
         "libcrypto",
+        "libkeymaster_portable",
         "libjsoncpp",
     ],
 }
@@ -76,6 +80,9 @@
         "libgmock",
         "libgtest_main",
     ],
+    defaults: [
+        "keymint_use_latest_hal_aidl_ndk_shared",
+    ],
     shared_libs: [
         "libbase",
         "libcppbor_external",
diff --git a/security/keymint/support/include/remote_prov/remote_prov_utils.h b/security/keymint/support/include/remote_prov/remote_prov_utils.h
index 406b7a9..1d3abe5 100644
--- a/security/keymint/support/include/remote_prov/remote_prov_utils.h
+++ b/security/keymint/support/include/remote_prov/remote_prov_utils.h
@@ -52,6 +52,34 @@
         0x31, 0xbf, 0x6b, 0xe8, 0x1e, 0x35, 0xe2, 0xf0, 0x2d, 0xce, 0x6c, 0x2f, 0x4f, 0xf2,
         0xf5, 0x4f, 0xa5, 0xd4, 0x83, 0xad, 0x96, 0xa2, 0xf1, 0x87, 0x58, 0x04};
 
+// The Google ECDSA P256 root key for the Endpoint Encryption Key chain, encoded as COSE_Sign1
+inline constexpr uint8_t kCoseEncodedEcdsa256RootCert[] = {
+    0x84, 0x43, 0xa1, 0x01, 0x26, 0xa0, 0x58, 0x4d, 0xa5, 0x01, 0x02, 0x03, 0x26, 0x20, 0x01, 0x21,
+    0x58, 0x20, 0xf7, 0x14, 0x8a, 0xdb, 0x97, 0xf4, 0xcc, 0x53, 0xef, 0xd2, 0x64, 0x11, 0xc4, 0xe3,
+    0x75, 0x1f, 0x66, 0x1f, 0xa4, 0x71, 0x0c, 0x6c, 0xcf, 0xfa, 0x09, 0x46, 0x80, 0x74, 0x87, 0x54,
+    0xf2, 0xad, 0x22, 0x58, 0x20, 0x5e, 0x7f, 0x5b, 0xf6, 0xec, 0xe4, 0xf6, 0x19, 0xcc, 0xff, 0x13,
+    0x37, 0xfd, 0x0f, 0xa1, 0xc8, 0x93, 0xdb, 0x18, 0x06, 0x76, 0xc4, 0x5d, 0xe6, 0xd7, 0x6a, 0x77,
+    0x86, 0xc3, 0x2d, 0xaf, 0x8f, 0x58, 0x40, 0x2f, 0x97, 0x8e, 0x42, 0xfb, 0xbe, 0x07, 0x2d, 0x95,
+    0x47, 0x85, 0x47, 0x93, 0x40, 0xb0, 0x1f, 0xd4, 0x9b, 0x47, 0xa4, 0xc4, 0x44, 0xa9, 0xf2, 0xa1,
+    0x07, 0x87, 0x10, 0xc7, 0x9f, 0xcb, 0x11, 0xf4, 0xbf, 0x9f, 0xe8, 0x3b, 0xe0, 0xe7, 0x34, 0x4c,
+    0x15, 0xfc, 0x7b, 0xc3, 0x7e, 0x33, 0x05, 0xf4, 0xd1, 0x34, 0x3c, 0xed, 0x02, 0x04, 0x60, 0x7a,
+    0x15, 0xe0, 0x79, 0xd3, 0x8a, 0xff, 0x24};
+
+// The Google ECDSA P256 Endpoint Encryption Key certificate, encoded as COSE_Sign1
+inline constexpr uint8_t kCoseEncodedEcdsa256GeekCert[] = {
+    0x84, 0x43, 0xa1, 0x01, 0x26, 0xa0, 0x58, 0x71, 0xa6, 0x01, 0x02, 0x02, 0x58, 0x20, 0x35, 0x73,
+    0xb7, 0x3f, 0xa0, 0x8a, 0x80, 0x89, 0xb1, 0x26, 0x67, 0xe9, 0xcb, 0x7c, 0x75, 0xa1, 0xaf, 0x02,
+    0x61, 0xfc, 0x6e, 0x65, 0x03, 0x91, 0x3b, 0xd3, 0x4b, 0x7d, 0x14, 0x94, 0x3e, 0x46, 0x03, 0x38,
+    0x18, 0x20, 0x01, 0x21, 0x58, 0x20, 0xe0, 0x41, 0xcf, 0x2f, 0x0f, 0x34, 0x0f, 0x1c, 0x33, 0x2c,
+    0x41, 0xb0, 0xcf, 0xd7, 0x0c, 0x30, 0x55, 0x35, 0xd2, 0x1e, 0x6a, 0x47, 0x13, 0x4b, 0x2e, 0xd1,
+    0x48, 0x96, 0x7e, 0x24, 0x9c, 0x68, 0x22, 0x58, 0x20, 0x1f, 0xce, 0x45, 0xc5, 0xfb, 0x61, 0xba,
+    0x81, 0x21, 0xf9, 0xe5, 0x05, 0x9b, 0x9b, 0x39, 0x0e, 0x76, 0x86, 0x86, 0x47, 0xb8, 0x1e, 0x2f,
+    0x45, 0xf1, 0xce, 0xaf, 0xda, 0x3f, 0x80, 0x68, 0xdb, 0x58, 0x40, 0x8c, 0xb3, 0xba, 0x7e, 0x20,
+    0x3e, 0x32, 0xb0, 0x68, 0xdf, 0x60, 0xd1, 0x1d, 0x7d, 0xf0, 0xac, 0x38, 0x8e, 0x51, 0xbc, 0xff,
+    0x6c, 0xe1, 0x67, 0x3b, 0x4a, 0x79, 0xbc, 0x56, 0x78, 0xb3, 0x99, 0xd8, 0x7c, 0x8a, 0x07, 0xd8,
+    0xda, 0xb5, 0xb5, 0x7f, 0x71, 0xf4, 0xd8, 0x6b, 0xdf, 0x33, 0x27, 0x34, 0x7b, 0x65, 0xd1, 0x2a,
+    0xeb, 0x86, 0x99, 0x98, 0xab, 0x3a, 0xb4, 0x80, 0xaa, 0xbd, 0x50};
+
 /**
  * Generates random bytes.
  */
@@ -64,15 +92,15 @@
 };
 
 /**
- * Generates an X25518 EEK with the specified eekId and an Ed25519 chain of the
- * specified length. All keys are generated randomly.
+ * Based on the supportedEekCurve, Generates an X25519/ECDH with the specified eekId
+ * and an Ed25519/ECDSA chain of the specified length. All keys are generated randomly.
  */
-ErrMsgOr<EekChain> generateEekChain(size_t length, const bytevec& eekId);
+ErrMsgOr<EekChain> generateEekChain(int32_t supportedEekCurve, size_t length, const bytevec& eekId);
 
 /**
  * Returns the CBOR-encoded, production Google Endpoint Encryption Key chain.
  */
-bytevec getProdEekChain();
+bytevec getProdEekChain(int32_t supportedEekCurve);
 
 struct BccEntryData {
     bytevec pubKey;
diff --git a/security/keymint/support/remote_prov_utils.cpp b/security/keymint/support/remote_prov_utils.cpp
index 35cb891..0776282 100644
--- a/security/keymint/support/remote_prov_utils.cpp
+++ b/security/keymint/support/remote_prov_utils.cpp
@@ -17,10 +17,16 @@
 #include <iterator>
 #include <tuple>
 
+#include <aidl/android/hardware/security/keymint/RpcHardwareInfo.h>
 #include <android-base/properties.h>
 #include <cppbor.h>
 #include <json/json.h>
+#include <keymaster/km_openssl/ec_key.h>
+#include <keymaster/km_openssl/ecdsa_operation.h>
+#include <keymaster/km_openssl/openssl_err.h>
+#include <keymaster/km_openssl/openssl_utils.h>
 #include <openssl/base64.h>
+#include <openssl/evp.h>
 #include <openssl/rand.h>
 #include <remote_prov/remote_prov_utils.h>
 
@@ -30,6 +36,166 @@
 constexpr uint32_t kBccPayloadSubject = 2;
 constexpr int32_t kBccPayloadSubjPubKey = -4670552;
 constexpr int32_t kBccPayloadKeyUsage = -4670553;
+constexpr int kP256AffinePointSize = 32;
+
+using EC_KEY_Ptr = bssl::UniquePtr<EC_KEY>;
+using EVP_PKEY_Ptr = bssl::UniquePtr<EVP_PKEY>;
+using EVP_PKEY_CTX_Ptr = bssl::UniquePtr<EVP_PKEY_CTX>;
+
+ErrMsgOr<bytevec> ecKeyGetPrivateKey(const EC_KEY* ecKey) {
+    // Extract private key.
+    const BIGNUM* bignum = EC_KEY_get0_private_key(ecKey);
+    if (bignum == nullptr) {
+        return "Error getting bignum from private key";
+    }
+    // Pad with zeros in case the length is lesser than 32.
+    bytevec privKey(32, 0);
+    BN_bn2binpad(bignum, privKey.data(), privKey.size());
+    return privKey;
+}
+
+ErrMsgOr<bytevec> ecKeyGetPublicKey(const EC_KEY* ecKey) {
+    // Extract public key.
+    auto group = EC_GROUP_Ptr(EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1));
+    if (group.get() == nullptr) {
+        return "Error creating EC group by curve name";
+    }
+    const EC_POINT* point = EC_KEY_get0_public_key(ecKey);
+    if (point == nullptr) return "Error getting ecpoint from public key";
+
+    int size =
+        EC_POINT_point2oct(group.get(), point, POINT_CONVERSION_UNCOMPRESSED, nullptr, 0, nullptr);
+    if (size == 0) {
+        return "Error generating public key encoding";
+    }
+
+    bytevec publicKey;
+    publicKey.resize(size);
+    EC_POINT_point2oct(group.get(), point, POINT_CONVERSION_UNCOMPRESSED, publicKey.data(),
+                       publicKey.size(), nullptr);
+    return publicKey;
+}
+
+ErrMsgOr<std::tuple<bytevec, bytevec>> getAffineCoordinates(const bytevec& pubKey) {
+    auto group = EC_GROUP_Ptr(EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1));
+    if (group.get() == nullptr) {
+        return "Error creating EC group by curve name";
+    }
+    auto point = EC_POINT_Ptr(EC_POINT_new(group.get()));
+    if (EC_POINT_oct2point(group.get(), point.get(), pubKey.data(), pubKey.size(), nullptr) != 1) {
+        return "Error decoding publicKey";
+    }
+    BIGNUM_Ptr x(BN_new());
+    BIGNUM_Ptr y(BN_new());
+    BN_CTX_Ptr ctx(BN_CTX_new());
+    if (!ctx.get()) return "Failed to create BN_CTX instance";
+
+    if (!EC_POINT_get_affine_coordinates_GFp(group.get(), point.get(), x.get(), y.get(),
+                                             ctx.get())) {
+        return "Failed to get affine coordinates from ECPoint";
+    }
+    bytevec pubX(kP256AffinePointSize);
+    bytevec pubY(kP256AffinePointSize);
+    if (BN_bn2binpad(x.get(), pubX.data(), kP256AffinePointSize) != kP256AffinePointSize) {
+        return "Error in converting absolute value of x coordinate to big-endian";
+    }
+    if (BN_bn2binpad(y.get(), pubY.data(), kP256AffinePointSize) != kP256AffinePointSize) {
+        return "Error in converting absolute value of y coordinate to big-endian";
+    }
+    return std::make_tuple(std::move(pubX), std::move(pubY));
+}
+
+ErrMsgOr<std::tuple<bytevec, bytevec>> generateEc256KeyPair() {
+    auto ec_key = EC_KEY_Ptr(EC_KEY_new());
+    if (ec_key.get() == nullptr) {
+        return "Failed to allocate ec key";
+    }
+
+    auto group = EC_GROUP_Ptr(EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1));
+    if (group.get() == nullptr) {
+        return "Error creating EC group by curve name";
+    }
+
+    if (EC_KEY_set_group(ec_key.get(), group.get()) != 1 ||
+        EC_KEY_generate_key(ec_key.get()) != 1 || EC_KEY_check_key(ec_key.get()) < 0) {
+        return "Error generating key";
+    }
+
+    auto privKey = ecKeyGetPrivateKey(ec_key.get());
+    if (!privKey) return privKey.moveMessage();
+
+    auto pubKey = ecKeyGetPublicKey(ec_key.get());
+    if (!pubKey) return pubKey.moveMessage();
+
+    return std::make_tuple(pubKey.moveValue(), privKey.moveValue());
+}
+
+ErrMsgOr<std::tuple<bytevec, bytevec>> generateX25519KeyPair() {
+    /* Generate X25519 key pair */
+    bytevec pubKey(X25519_PUBLIC_VALUE_LEN);
+    bytevec privKey(X25519_PRIVATE_KEY_LEN);
+    X25519_keypair(pubKey.data(), privKey.data());
+    return std::make_tuple(std::move(pubKey), std::move(privKey));
+}
+
+ErrMsgOr<std::tuple<bytevec, bytevec>> generateED25519KeyPair() {
+    /* Generate ED25519 key pair */
+    bytevec pubKey(ED25519_PUBLIC_KEY_LEN);
+    bytevec privKey(ED25519_PRIVATE_KEY_LEN);
+    ED25519_keypair(pubKey.data(), privKey.data());
+    return std::make_tuple(std::move(pubKey), std::move(privKey));
+}
+
+ErrMsgOr<std::tuple<bytevec, bytevec>> generateKeyPair(int32_t supportedEekCurve, bool isEek) {
+    switch (supportedEekCurve) {
+    case RpcHardwareInfo::CURVE_25519:
+        if (isEek) {
+            return generateX25519KeyPair();
+        }
+        return generateED25519KeyPair();
+    case RpcHardwareInfo::CURVE_P256:
+        return generateEc256KeyPair();
+    default:
+        return "Unknown EEK Curve.";
+    }
+}
+
+ErrMsgOr<bytevec> constructCoseKey(int32_t supportedEekCurve, const bytevec& eekId,
+                                   const bytevec& pubKey) {
+    CoseKeyType keyType;
+    CoseKeyAlgorithm algorithm;
+    CoseKeyCurve curve;
+    bytevec pubX;
+    bytevec pubY;
+    switch (supportedEekCurve) {
+    case RpcHardwareInfo::CURVE_25519:
+        keyType = OCTET_KEY_PAIR;
+        algorithm = (eekId.empty()) ? EDDSA : ECDH_ES_HKDF_256;
+        curve = (eekId.empty()) ? ED25519 : cppcose::X25519;
+        pubX = pubKey;
+        break;
+    case RpcHardwareInfo::CURVE_P256: {
+        keyType = EC2;
+        algorithm = (eekId.empty()) ? ES256 : ECDH_ES_HKDF_256;
+        curve = P256;
+        auto affineCoordinates = getAffineCoordinates(pubKey);
+        if (!affineCoordinates) return affineCoordinates.moveMessage();
+        std::tie(pubX, pubY) = affineCoordinates.moveValue();
+    } break;
+    default:
+        return "Unknown EEK Curve.";
+    }
+    cppbor::Map coseKey = cppbor::Map()
+                              .add(CoseKey::KEY_TYPE, keyType)
+                              .add(CoseKey::ALGORITHM, algorithm)
+                              .add(CoseKey::CURVE, curve)
+                              .add(CoseKey::PUBKEY_X, pubX);
+
+    if (!pubY.empty()) coseKey.add(CoseKey::PUBKEY_Y, pubY);
+    if (!eekId.empty()) coseKey.add(CoseKey::KEY_ID, eekId);
+
+    return coseKey.canonicalize().encode();
+}
 
 bytevec kTestMacKey(32 /* count */, 0 /* byte value */);
 
@@ -39,7 +205,17 @@
     return retval;
 }
 
-ErrMsgOr<EekChain> generateEekChain(size_t length, const bytevec& eekId) {
+ErrMsgOr<cppbor::Array> constructCoseSign1(int32_t supportedEekCurve, const bytevec& key,
+                                           const bytevec& payload, const bytevec& aad) {
+    if (supportedEekCurve == RpcHardwareInfo::CURVE_P256) {
+        return constructECDSACoseSign1(key, {} /* protectedParams */, payload, aad);
+    } else {
+        return cppcose::constructCoseSign1(key, payload, aad);
+    }
+}
+
+ErrMsgOr<EekChain> generateEekChain(int32_t supportedEekCurve, size_t length,
+                                    const bytevec& eekId) {
     if (length < 2) {
         return "EEK chain must contain at least 2 certs.";
     }
@@ -48,59 +224,62 @@
 
     bytevec prev_priv_key;
     for (size_t i = 0; i < length - 1; ++i) {
-        bytevec pub_key(ED25519_PUBLIC_KEY_LEN);
-        bytevec priv_key(ED25519_PRIVATE_KEY_LEN);
-
-        ED25519_keypair(pub_key.data(), priv_key.data());
+        auto keyPair = generateKeyPair(supportedEekCurve, false);
+        if (!keyPair) keyPair.moveMessage();
+        auto [pub_key, priv_key] = keyPair.moveValue();
 
         // The first signing key is self-signed.
         if (prev_priv_key.empty()) prev_priv_key = priv_key;
 
-        auto coseSign1 = constructCoseSign1(prev_priv_key,
-                                            cppbor::Map() /* payload CoseKey */
-                                                    .add(CoseKey::KEY_TYPE, OCTET_KEY_PAIR)
-                                                    .add(CoseKey::ALGORITHM, EDDSA)
-                                                    .add(CoseKey::CURVE, ED25519)
-                                                    .add(CoseKey::PUBKEY_X, pub_key)
-                                                    .canonicalize()
-                                                    .encode(),
-                                            {} /* AAD */);
+        auto coseKey = constructCoseKey(supportedEekCurve, {}, pub_key);
+        if (!coseKey) return coseKey.moveMessage();
+
+        auto coseSign1 =
+            constructCoseSign1(supportedEekCurve, prev_priv_key, coseKey.moveValue(), {} /* AAD */);
         if (!coseSign1) return coseSign1.moveMessage();
         eekChain.add(coseSign1.moveValue());
 
         prev_priv_key = priv_key;
     }
+    auto keyPair = generateKeyPair(supportedEekCurve, true);
+    if (!keyPair) keyPair.moveMessage();
+    auto [pub_key, priv_key] = keyPair.moveValue();
 
-    bytevec pub_key(X25519_PUBLIC_VALUE_LEN);
-    bytevec priv_key(X25519_PRIVATE_KEY_LEN);
-    X25519_keypair(pub_key.data(), priv_key.data());
+    auto coseKey = constructCoseKey(supportedEekCurve, eekId, pub_key);
+    if (!coseKey) return coseKey.moveMessage();
 
-    auto coseSign1 = constructCoseSign1(prev_priv_key,
-                                        cppbor::Map() /* payload CoseKey */
-                                                .add(CoseKey::KEY_TYPE, OCTET_KEY_PAIR)
-                                                .add(CoseKey::KEY_ID, eekId)
-                                                .add(CoseKey::ALGORITHM, ECDH_ES_HKDF_256)
-                                                .add(CoseKey::CURVE, cppcose::X25519)
-                                                .add(CoseKey::PUBKEY_X, pub_key)
-                                                .canonicalize()
-                                                .encode(),
-                                        {} /* AAD */);
+    auto coseSign1 =
+        constructCoseSign1(supportedEekCurve, prev_priv_key, coseKey.moveValue(), {} /* AAD */);
     if (!coseSign1) return coseSign1.moveMessage();
     eekChain.add(coseSign1.moveValue());
 
+    if (supportedEekCurve == RpcHardwareInfo::CURVE_P256) {
+        // convert ec public key to x and y co-ordinates.
+        auto affineCoordinates = getAffineCoordinates(pub_key);
+        if (!affineCoordinates) return affineCoordinates.moveMessage();
+        auto [pubX, pubY] = affineCoordinates.moveValue();
+        pub_key.clear();
+        pub_key.insert(pub_key.begin(), pubX.begin(), pubX.end());
+        pub_key.insert(pub_key.end(), pubY.begin(), pubY.end());
+    }
+
     return EekChain{eekChain.encode(), pub_key, priv_key};
 }
 
-bytevec getProdEekChain() {
-    bytevec prodEek;
-    prodEek.reserve(1 + sizeof(kCoseEncodedRootCert) + sizeof(kCoseEncodedGeekCert));
-
-    // In CBOR encoding, 0x82 indicates an array of two items
-    prodEek.push_back(0x82);
-    prodEek.insert(prodEek.end(), std::begin(kCoseEncodedRootCert), std::end(kCoseEncodedRootCert));
-    prodEek.insert(prodEek.end(), std::begin(kCoseEncodedGeekCert), std::end(kCoseEncodedGeekCert));
-
-    return prodEek;
+bytevec getProdEekChain(int32_t supportedEekCurve) {
+    cppbor::Array chain;
+    if (supportedEekCurve == RpcHardwareInfo::CURVE_P256) {
+        chain.add(cppbor::EncodedItem(bytevec(std::begin(kCoseEncodedEcdsa256RootCert),
+                                              std::end(kCoseEncodedEcdsa256RootCert))));
+        chain.add(cppbor::EncodedItem(bytevec(std::begin(kCoseEncodedEcdsa256GeekCert),
+                                              std::end(kCoseEncodedEcdsa256GeekCert))));
+    } else {
+        chain.add(cppbor::EncodedItem(
+            bytevec(std::begin(kCoseEncodedRootCert), std::end(kCoseEncodedRootCert))));
+        chain.add(cppbor::EncodedItem(
+            bytevec(std::begin(kCoseEncodedGeekCert), std::end(kCoseEncodedGeekCert))));
+    }
+    return chain.encode();
 }
 
 ErrMsgOr<bytevec> validatePayloadAndFetchPubKey(const cppbor::Map* payload) {
@@ -139,7 +318,8 @@
     }
 
     auto& algorithm = parsedProtParams->asMap()->get(ALGORITHM);
-    if (!algorithm || !algorithm->asInt() || algorithm->asInt()->value() != EDDSA) {
+    if (!algorithm || !algorithm->asInt() ||
+        (algorithm->asInt()->value() != EDDSA && algorithm->asInt()->value() != ES256)) {
         return "Unsupported signature algorithm";
     }
 
@@ -152,15 +332,36 @@
     }
 
     bool selfSigned = signingCoseKey.empty();
-    auto key = CoseKey::parseEd25519(selfSigned ? *serializedKey : signingCoseKey);
-    if (!key) return "Bad signing key: " + key.moveMessage();
-
     bytevec signatureInput =
-            cppbor::Array().add("Signature1").add(*protectedParams).add(aad).add(*payload).encode();
+        cppbor::Array().add("Signature1").add(*protectedParams).add(aad).add(*payload).encode();
 
-    if (!ED25519_verify(signatureInput.data(), signatureInput.size(), signature->value().data(),
-                        key->getBstrValue(CoseKey::PUBKEY_X)->data())) {
-        return "Signature verification failed";
+    if (algorithm->asInt()->value() == EDDSA) {
+        auto key = CoseKey::parseEd25519(selfSigned ? *serializedKey : signingCoseKey);
+
+        if (!key) return "Bad signing key: " + key.moveMessage();
+
+        if (!ED25519_verify(signatureInput.data(), signatureInput.size(), signature->value().data(),
+                            key->getBstrValue(CoseKey::PUBKEY_X)->data())) {
+            return "Signature verification failed";
+        }
+    } else {  // P256
+        auto key = CoseKey::parseP256(selfSigned ? *serializedKey : signingCoseKey);
+        if (!key || key->getBstrValue(CoseKey::PUBKEY_X)->empty() ||
+            key->getBstrValue(CoseKey::PUBKEY_Y)->empty()) {
+            return "Bad signing key: " + key.moveMessage();
+        }
+        auto publicKey = key->getEcPublicKey();
+        if (!publicKey) return publicKey.moveMessage();
+
+        auto ecdsaDerSignature = ecdsaCoseSignatureToDer(signature->value());
+        if (!ecdsaDerSignature) return ecdsaDerSignature.moveMessage();
+
+        // convert public key to uncompressed form.
+        publicKey->insert(publicKey->begin(), 0x04);
+
+        if (!verifyEcdsaDigest(publicKey.moveValue(), sha256(signatureInput), *ecdsaDerSignature)) {
+            return "Signature verification failed";
+        }
     }
 
     return serializedKey.moveValue();
diff --git a/security/keymint/support/remote_prov_utils_test.cpp b/security/keymint/support/remote_prov_utils_test.cpp
index 8697c51..e1c4467 100644
--- a/security/keymint/support/remote_prov_utils_test.cpp
+++ b/security/keymint/support/remote_prov_utils_test.cpp
@@ -14,8 +14,12 @@
  * limitations under the License.
  */
 
+#include "cppbor.h"
+#include "keymaster/cppcose/cppcose.h"
+#include <aidl/android/hardware/security/keymint/RpcHardwareInfo.h>
 #include <android-base/properties.h>
 #include <cppbor_parse.h>
+#include <cstdint>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 #include <keymaster/android_keymaster_utils.h>
@@ -23,25 +27,120 @@
 #include <keymaster/remote_provisioning_utils.h>
 #include <openssl/curve25519.h>
 #include <remote_prov/remote_prov_utils.h>
-#include <cstdint>
-#include "cppbor.h"
-#include "keymaster/cppcose/cppcose.h"
 
 namespace aidl::android::hardware::security::keymint::remote_prov {
 namespace {
 
 using ::keymaster::KeymasterBlob;
-using ::keymaster::validateAndExtractEekPubAndId;
+using ::keymaster::kStatusFailed;
+using ::keymaster::kStatusInvalidEek;
+using ::keymaster::StatusOr;
 using ::testing::ElementsAreArray;
+using byte_view = std::basic_string_view<uint8_t>;
+
+struct KeyInfoEcdsa {
+    CoseKeyCurve curve;
+    byte_view pubKeyX;
+    byte_view pubKeyY;
+
+    bool operator==(const KeyInfoEcdsa& other) const {
+        return curve == other.curve && pubKeyX == other.pubKeyX && pubKeyY == other.pubKeyY;
+    }
+};
+
+// The production root signing key for Google ECDSA P256 Endpoint Encryption Key cert chains.
+inline constexpr uint8_t kEcdsa256GeekRootX[] = {
+    0xf7, 0x14, 0x8a, 0xdb, 0x97, 0xf4, 0xcc, 0x53, 0xef, 0xd2, 0x64, 0x11, 0xc4, 0xe3, 0x75, 0x1f,
+    0x66, 0x1f, 0xa4, 0x71, 0x0c, 0x6c, 0xcf, 0xfa, 0x09, 0x46, 0x80, 0x74, 0x87, 0x54, 0xf2, 0xad};
+
+inline constexpr uint8_t kEcdsa256GeekRootY[] = {
+    0x5e, 0x7f, 0x5b, 0xf6, 0xec, 0xe4, 0xf6, 0x19, 0xcc, 0xff, 0x13, 0x37, 0xfd, 0x0f, 0xa1, 0xc8,
+    0x93, 0xdb, 0x18, 0x06, 0x76, 0xc4, 0x5d, 0xe6, 0xd7, 0x6a, 0x77, 0x86, 0xc3, 0x2d, 0xaf, 0x8f};
+
+// Hard-coded set of acceptable public COSE_Keys that can act as roots of EEK chains.
+inline constexpr KeyInfoEcdsa kAuthorizedEcdsa256EekRoots[] = {
+    {CoseKeyCurve::P256, byte_view(kEcdsa256GeekRootX, sizeof(kEcdsa256GeekRootX)),
+     byte_view(kEcdsa256GeekRootY, sizeof(kEcdsa256GeekRootY))},
+};
+
+static ErrMsgOr<CoseKey> parseEcdh256(const bytevec& coseKey) {
+    auto key = CoseKey::parse(coseKey, EC2, ECDH_ES_HKDF_256, P256);
+    if (!key) return key;
+
+    auto& pubkey_x = key->getMap().get(cppcose::CoseKey::PUBKEY_X);
+    auto& pubkey_y = key->getMap().get(cppcose::CoseKey::PUBKEY_Y);
+    if (!pubkey_x || !pubkey_y || !pubkey_x->asBstr() || !pubkey_y->asBstr() ||
+        pubkey_x->asBstr()->value().size() != 32 || pubkey_y->asBstr()->value().size() != 32) {
+        return "Invalid P256 public key";
+    }
+
+    return key;
+}
+
+StatusOr<std::tuple<std::vector<uint8_t> /* EEK pubX */, std::vector<uint8_t> /* EEK pubY */,
+                    std::vector<uint8_t> /* EEK ID */>>
+validateAndExtractEcdsa256EekPubAndId(bool testMode,
+                                      const KeymasterBlob& endpointEncryptionCertChain) {
+    auto [item, newPos, errMsg] =
+        cppbor::parse(endpointEncryptionCertChain.begin(), endpointEncryptionCertChain.end());
+    if (!item || !item->asArray()) {
+        return kStatusFailed;
+    }
+    const cppbor::Array* certArr = item->asArray();
+    std::vector<uint8_t> lastPubKey;
+    for (size_t i = 0; i < certArr->size(); ++i) {
+        auto cosePubKey =
+            verifyAndParseCoseSign1(certArr->get(i)->asArray(), lastPubKey, {} /* AAD */);
+        if (!cosePubKey) {
+            return kStatusInvalidEek;
+        }
+        lastPubKey = *std::move(cosePubKey);
+
+        // In prod mode the first pubkey should match a well-known Google public key.
+        if (!testMode && i == 0) {
+            auto parsedPubKey = CoseKey::parse(lastPubKey);
+            if (!parsedPubKey) {
+                return kStatusFailed;
+            }
+            auto curve = parsedPubKey->getIntValue(CoseKey::CURVE);
+            if (!curve) {
+                return kStatusInvalidEek;
+            }
+            auto rawPubX = parsedPubKey->getBstrValue(CoseKey::PUBKEY_X);
+            if (!rawPubX) {
+                return kStatusInvalidEek;
+            }
+            auto rawPubY = parsedPubKey->getBstrValue(CoseKey::PUBKEY_Y);
+            if (!rawPubY) {
+                return kStatusInvalidEek;
+            }
+            KeyInfoEcdsa matcher = {static_cast<CoseKeyCurve>(*curve),
+                                    byte_view(rawPubX->data(), rawPubX->size()),
+                                    byte_view(rawPubY->data(), rawPubY->size())};
+            if (std::find(std::begin(kAuthorizedEcdsa256EekRoots),
+                          std::end(kAuthorizedEcdsa256EekRoots),
+                          matcher) == std::end(kAuthorizedEcdsa256EekRoots)) {
+                return kStatusInvalidEek;
+            }
+        }
+    }
+    auto eek = parseEcdh256(lastPubKey);
+    if (!eek) {
+        return kStatusInvalidEek;
+    }
+    return std::make_tuple(eek->getBstrValue(CoseKey::PUBKEY_X).value(),
+                           eek->getBstrValue(CoseKey::PUBKEY_Y).value(),
+                           eek->getBstrValue(CoseKey::KEY_ID).value());
+}
 
 TEST(RemoteProvUtilsTest, GenerateEekChainInvalidLength) {
-    ASSERT_FALSE(generateEekChain(1, /*eekId=*/{}));
+    ASSERT_FALSE(generateEekChain(RpcHardwareInfo::CURVE_25519, 1, /*eekId=*/{}));
 }
 
 TEST(RemoteProvUtilsTest, GenerateEekChain) {
     bytevec kTestEekId = {'t', 'e', 's', 't', 'I', 'd', 0};
     for (size_t length : {2, 3, 31}) {
-        auto get_eek_result = generateEekChain(length, kTestEekId);
+        auto get_eek_result = generateEekChain(RpcHardwareInfo::CURVE_25519, length, kTestEekId);
         ASSERT_TRUE(get_eek_result) << get_eek_result.message();
 
         auto& [chain, pubkey, privkey] = *get_eek_result;
@@ -57,7 +156,7 @@
 }
 
 TEST(RemoteProvUtilsTest, GetProdEekChain) {
-    auto chain = getProdEekChain();
+    auto chain = getProdEekChain(RpcHardwareInfo::CURVE_25519);
 
     auto validation_result = validateAndExtractEekPubAndId(
             /*testMode=*/false, KeymasterBlob(chain.data(), chain.size()));
@@ -97,5 +196,57 @@
     ASSERT_EQ(json, expected);
 }
 
+TEST(RemoteProvUtilsTest, GenerateEcdsaEekChainInvalidLength) {
+    ASSERT_FALSE(generateEekChain(RpcHardwareInfo::CURVE_P256, 1, /*eekId=*/{}));
+}
+
+TEST(RemoteProvUtilsTest, GenerateEcdsaEekChain) {
+    bytevec kTestEekId = {'t', 'e', 's', 't', 'I', 'd', 0};
+    for (size_t length : {2, 3, 31}) {
+        auto get_eek_result = generateEekChain(RpcHardwareInfo::CURVE_P256, length, kTestEekId);
+        ASSERT_TRUE(get_eek_result) << get_eek_result.message();
+
+        auto& [chain, pubkey, privkey] = *get_eek_result;
+
+        auto validation_result = validateAndExtractEcdsa256EekPubAndId(
+            /*testMode=*/true, KeymasterBlob(chain.data(), chain.size()));
+        ASSERT_TRUE(validation_result.isOk());
+
+        auto& [eekPubX, eekPubY, eekId] = *validation_result;
+        bytevec eekPub;
+        eekPub.insert(eekPub.begin(), eekPubX.begin(), eekPubX.end());
+        eekPub.insert(eekPub.end(), eekPubY.begin(), eekPubY.end());
+        EXPECT_THAT(eekId, ElementsAreArray(kTestEekId));
+        EXPECT_THAT(eekPub, ElementsAreArray(pubkey));
+    }
+}
+
+TEST(RemoteProvUtilsTest, GetProdEcdsaEekChain) {
+    auto chain = getProdEekChain(RpcHardwareInfo::CURVE_P256);
+
+    auto validation_result = validateAndExtractEcdsa256EekPubAndId(
+        /*testMode=*/false, KeymasterBlob(chain.data(), chain.size()));
+    ASSERT_TRUE(validation_result.isOk()) << "Error: " << validation_result.moveError();
+
+    auto& [eekPubX, eekPubY, eekId] = *validation_result;
+
+    auto [geekCert, ignoredNewPos, error] =
+        cppbor::parse(kCoseEncodedEcdsa256GeekCert, sizeof(kCoseEncodedEcdsa256GeekCert));
+    ASSERT_NE(geekCert, nullptr) << "Error: " << error;
+    ASSERT_NE(geekCert->asArray(), nullptr);
+
+    auto& encodedGeekCoseKey = geekCert->asArray()->get(kCoseSign1Payload);
+    ASSERT_NE(encodedGeekCoseKey, nullptr);
+    ASSERT_NE(encodedGeekCoseKey->asBstr(), nullptr);
+
+    auto geek = CoseKey::parse(encodedGeekCoseKey->asBstr()->value());
+    ASSERT_TRUE(geek) << "Error: " << geek.message();
+
+    const std::vector<uint8_t> empty;
+    EXPECT_THAT(eekId, ElementsAreArray(geek->getBstrValue(CoseKey::KEY_ID).value_or(empty)));
+    EXPECT_THAT(eekPubX, ElementsAreArray(geek->getBstrValue(CoseKey::PUBKEY_X).value_or(empty)));
+    EXPECT_THAT(eekPubY, ElementsAreArray(geek->getBstrValue(CoseKey::PUBKEY_Y).value_or(empty)));
+}
+
 }  // namespace
 }  // namespace aidl::android::hardware::security::keymint::remote_prov