diff --git a/libs/bssl/error/src/lib.rs b/libs/bssl/error/src/lib.rs
index 7f01c6c..82a2d5e 100644
--- a/libs/bssl/error/src/lib.rs
+++ b/libs/bssl/error/src/lib.rs
@@ -91,6 +91,7 @@
     ECDSA_sign,
     ECDSA_size,
     ECDSA_verify,
+    ED25519_verify,
     EVP_AEAD_CTX_new,
     EVP_AEAD_CTX_open,
     EVP_AEAD_CTX_seal,
diff --git a/libs/bssl/src/curve25519.rs b/libs/bssl/src/curve25519.rs
new file mode 100644
index 0000000..499a3d0
--- /dev/null
+++ b/libs/bssl/src/curve25519.rs
@@ -0,0 +1,39 @@
+// Copyright 2023, 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.
+
+//! Wrappers of the Curve25519 related functions in BoringSSL curve25519.h.
+
+use crate::util::check_int_result;
+use bssl_avf_error::{ApiName, Result};
+
+const ED25519_PUBLIC_KEY_LEN: usize = bssl_ffi::ED25519_PUBLIC_KEY_LEN as usize;
+const ED25519_SIGNATURE_LEN: usize = bssl_ffi::ED25519_SIGNATURE_LEN as usize;
+
+/// Verifies the signature of a message with the given ED25519 public key.
+pub fn ed25519_verify(
+    message: &[u8],
+    signature: &[u8; ED25519_SIGNATURE_LEN],
+    public_key: &[u8; ED25519_PUBLIC_KEY_LEN],
+) -> Result<()> {
+    // SAFETY: The function only reads the parameters within their bounds.
+    let ret = unsafe {
+        bssl_ffi::ED25519_verify(
+            message.as_ptr(),
+            message.len(),
+            signature.as_ptr(),
+            public_key.as_ptr(),
+        )
+    };
+    check_int_result(ret, ApiName::ED25519_verify)
+}
diff --git a/libs/bssl/src/lib.rs b/libs/bssl/src/lib.rs
index a420168..ad51b61 100644
--- a/libs/bssl/src/lib.rs
+++ b/libs/bssl/src/lib.rs
@@ -21,6 +21,7 @@
 mod aead;
 mod cbb;
 mod cbs;
+mod curve25519;
 mod digest;
 mod ec_key;
 mod err;
@@ -36,6 +37,7 @@
 pub use aead::{Aead, AeadContext, AES_GCM_NONCE_LENGTH};
 pub use cbb::CbbFixed;
 pub use cbs::Cbs;
+pub use curve25519::ed25519_verify;
 pub use digest::Digester;
 pub use ec_key::{EcKey, ZVec};
 pub use evp::{PKey, PKeyType};
diff --git a/service_vm/fake_chain/Android.bp b/service_vm/fake_chain/Android.bp
index ebc185d..2bc7b4e 100644
--- a/service_vm/fake_chain/Android.bp
+++ b/service_vm/fake_chain/Android.bp
@@ -24,6 +24,7 @@
     visibility: [
         "//packages/modules/Virtualization/rialto:__subpackages__",
     ],
+    prefer_rlib: true,
     rustlibs: [
         "libcstr",
     ],
@@ -40,6 +41,7 @@
         "libcoset",
         "libdiced_open_dice",
         "liblog_rust",
+        "libmicrodroid_kernel_hashes",
     ],
 }
 
diff --git a/service_vm/fake_chain/src/client_vm.rs b/service_vm/fake_chain/src/client_vm.rs
index eb8654b..44ea898 100644
--- a/service_vm/fake_chain/src/client_vm.rs
+++ b/service_vm/fake_chain/src/client_vm.rs
@@ -24,21 +24,16 @@
 use coset::CborSerializable;
 use cstr::cstr;
 use diced_open_dice::{
-    retry_bcc_format_config_descriptor, retry_bcc_main_flow, Config, DiceArtifacts,
+    hash, retry_bcc_format_config_descriptor, retry_bcc_main_flow, Config, DiceArtifacts,
     DiceConfigValues, DiceError, DiceMode, InputValues, OwnedDiceArtifacts, Result, HASH_SIZE,
     HIDDEN_SIZE,
 };
 use log::error;
+use microdroid_kernel_hashes::{INITRD_DEBUG_HASH, KERNEL_HASH};
 
 type CborResult<T> = result::Result<T, ciborium::value::Error>;
 
 /// All the following data are generated with urandom.
-const CODE_HASH_KERNEL: [u8; HASH_SIZE] = [
-    0xc8, 0x54, 0x6c, 0xad, 0x9d, 0xe7, 0x25, 0xc7, 0x2b, 0xed, 0x07, 0xe1, 0xe9, 0x1a, 0xb0, 0xd0,
-    0xa7, 0x7f, 0x43, 0xb9, 0xe4, 0x56, 0x79, 0x0d, 0x7d, 0xd8, 0xc5, 0xdd, 0xad, 0x0d, 0x31, 0x85,
-    0xaf, 0x94, 0x02, 0xd8, 0x9d, 0x70, 0xab, 0xba, 0xac, 0xc7, 0x12, 0x80, 0xec, 0x7b, 0x9b, 0x65,
-    0xec, 0x6b, 0xdd, 0x64, 0x94, 0xd0, 0x9a, 0x3a, 0x09, 0xf2, 0x49, 0xdb, 0x60, 0x3c, 0x50, 0x30,
-];
 const CODE_HASH_PAYLOAD: [u8; HASH_SIZE] = [
     0x08, 0x78, 0xc2, 0x5b, 0xe7, 0xea, 0x3d, 0x62, 0x70, 0x22, 0xd9, 0x1c, 0x4f, 0x3c, 0x2e, 0x2f,
     0x0f, 0x97, 0xa4, 0x6f, 0x6d, 0xd5, 0xe6, 0x4a, 0x6d, 0xbe, 0x34, 0x2e, 0x56, 0x04, 0xaf, 0xef,
@@ -111,7 +106,7 @@
     // so the authority hash is the same.
     let authority_hash = service_vm::AUTHORITY_HASH_SERVICE_VM;
     let input_values = InputValues::new(
-        CODE_HASH_KERNEL,
+        kernel_code_hash()?,
         Config::Descriptor(config_descriptor.as_slice()),
         authority_hash,
         DiceMode::kDiceModeDebug,
@@ -179,3 +174,8 @@
         },
     ]
 }
+
+fn kernel_code_hash() -> Result<[u8; HASH_SIZE]> {
+    let code_hash = [KERNEL_HASH, INITRD_DEBUG_HASH].concat();
+    hash(&code_hash)
+}
diff --git a/service_vm/kernel/Android.bp b/service_vm/kernel/Android.bp
new file mode 100644
index 0000000..79158e6
--- /dev/null
+++ b/service_vm/kernel/Android.bp
@@ -0,0 +1,31 @@
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+python_binary_host {
+    name: "extract_microdroid_kernel_hashes",
+    srcs: ["extract_microdroid_kernel_hashes.py"],
+}
+
+genrule {
+    name: "microdroid_kernel_hashes_rs",
+    srcs: [":microdroid_kernel"],
+    out: ["lib.rs"],
+    tools: [
+        "extract_microdroid_kernel_hashes",
+        "avbtool",
+    ],
+    cmd: "$(location extract_microdroid_kernel_hashes) $(location avbtool) $(in) > $(out)",
+}
+
+rust_library_rlib {
+    name: "libmicrodroid_kernel_hashes",
+    srcs: [":microdroid_kernel_hashes_rs"],
+    crate_name: "microdroid_kernel_hashes",
+    prefer_rlib: true,
+    no_stdlibs: true,
+    stdlibs: [
+        "libcompiler_builtins.rust_sysroot",
+        "libcore.rust_sysroot",
+    ],
+}
diff --git a/service_vm/kernel/extract_microdroid_kernel_hashes.py b/service_vm/kernel/extract_microdroid_kernel_hashes.py
new file mode 100644
index 0000000..148e8be
--- /dev/null
+++ b/service_vm/kernel/extract_microdroid_kernel_hashes.py
@@ -0,0 +1,73 @@
+"""Extracts the following hashes from the AVB footer of Microdroid's kernel:
+
+- kernel hash
+- initrd_normal hash
+- initrd_debug hash
+
+The hashes are written to stdout as a Rust file.
+
+In unsupportive environments such as x86, when the kernel is just an empty file,
+the output Rust file has the same hash constant fields for compatibility
+reasons, but all of them are empty.
+"""
+#!/usr/bin/env python3
+
+import sys
+import subprocess
+from typing import Dict
+
+PARTITION_NAME_BOOT = 'boot'
+PARTITION_NAME_INITRD_NORMAL = 'initrd_normal'
+PARTITION_NAME_INITRD_DEBUG = 'initrd_debug'
+
+def main(args):
+    """Main function."""
+    avbtool = args[0]
+    kernel_image_path = args[1]
+    hashes = collect_hashes(avbtool, kernel_image_path)
+
+    print("//! This file is generated by extract_microdroid_kernel_hashes.py.")
+    print("//! It contains the hashes of the kernel and initrds.\n")
+    print("#![no_std]\n#![allow(missing_docs)]\n")
+
+    # Microdroid's kernel is just an empty file in unsupportive environments
+    # such as x86, in this case the hashes should be empty.
+    if hashes.keys() != {PARTITION_NAME_BOOT,
+                         PARTITION_NAME_INITRD_NORMAL,
+                         PARTITION_NAME_INITRD_DEBUG}:
+        print("/// The kernel is empty, no hashes are available.")
+        hashes[PARTITION_NAME_BOOT] = ""
+        hashes[PARTITION_NAME_INITRD_NORMAL] = ""
+        hashes[PARTITION_NAME_INITRD_DEBUG] = ""
+
+    print("pub const KERNEL_HASH: &[u8] = &["
+          f"{format_hex_string(hashes[PARTITION_NAME_BOOT])}];\n")
+    print("pub const INITRD_NORMAL_HASH: &[u8] = &["
+          f"{format_hex_string(hashes[PARTITION_NAME_INITRD_NORMAL])}];\n")
+    print("pub const INITRD_DEBUG_HASH: &[u8] = &["
+          f"{format_hex_string(hashes[PARTITION_NAME_INITRD_DEBUG])}];")
+
+def collect_hashes(avbtool: str, kernel_image_path: str) -> Dict[str, str]:
+    """Collects the hashes from the AVB footer of the kernel image."""
+    hashes = {}
+    with subprocess.Popen(
+        [avbtool, 'print_partition_digests', '--image', kernel_image_path],
+        stdout=subprocess.PIPE, stderr=subprocess.STDOUT) as proc:
+        stdout, _ = proc.communicate()
+        for line in stdout.decode("utf-8").split("\n"):
+            line = line.replace(" ", "").split(":")
+            if len(line) == 2:
+                partition_name, hash_ = line
+                hashes[partition_name] = hash_
+    return hashes
+
+def format_hex_string(hex_string: str) -> str:
+    """Formats a hex string into a Rust array."""
+    assert len(hex_string) % 2 == 0, \
+          "Hex string must have even length: " + hex_string
+    return ", ".join(["\n0x" + hex_string[i:i+2] if i % 32 == 0
+                       else "0x" + hex_string[i:i+2]
+                       for i in range(0, len(hex_string), 2)])
+
+if __name__ == '__main__':
+    main(sys.argv[1:])
diff --git a/service_vm/requests/Android.bp b/service_vm/requests/Android.bp
index 52b54b4..57da012 100644
--- a/service_vm/requests/Android.bp
+++ b/service_vm/requests/Android.bp
@@ -24,6 +24,7 @@
         "libder_nostd",
         "libdiced_open_dice_nostd",
         "liblog_rust_nostd",
+        "libmicrodroid_kernel_hashes",
         "libserde_nostd",
         "libservice_vm_comm_nostd",
         "libspki_nostd",
diff --git a/service_vm/requests/src/client_vm.rs b/service_vm/requests/src/client_vm.rs
index cfdac2d..c2f39e7 100644
--- a/service_vm/requests/src/client_vm.rs
+++ b/service_vm/requests/src/client_vm.rs
@@ -16,20 +16,26 @@
 //! client VM.
 
 use crate::cert;
-use crate::dice::{validate_client_vm_dice_chain_prefix_match, ClientVmDiceChain};
+use crate::dice::{
+    validate_client_vm_dice_chain_prefix_match, ClientVmDiceChain, DiceChainEntryPayload,
+};
 use crate::keyblob::decrypt_private_key;
 use alloc::vec::Vec;
-use bssl_avf::{rand_bytes, sha256, EcKey, PKey};
+use bssl_avf::{rand_bytes, sha256, Digester, EcKey, PKey};
+use cbor_util::value_to_array;
+use ciborium::value::Value;
 use core::result;
-use coset::{CborSerializable, CoseSign};
+use coset::{AsCborValue, CborSerializable, CoseSign, CoseSign1};
 use der::{Decode, Encode};
-use diced_open_dice::DiceArtifacts;
+use diced_open_dice::{DiceArtifacts, HASH_SIZE};
 use log::error;
+use microdroid_kernel_hashes::{INITRD_DEBUG_HASH, INITRD_NORMAL_HASH, KERNEL_HASH};
 use service_vm_comm::{ClientVmAttestationParams, Csr, CsrPayload, RequestProcessingError};
 use x509_cert::{certificate::Certificate, name::Name};
 
 type Result<T> = result::Result<T, RequestProcessingError>;
 
+const DICE_CDI_LEAF_SIGNATURE_INDEX: usize = 0;
 const ATTESTATION_KEY_SIGNATURE_INDEX: usize = 1;
 
 pub(super) fn request_attestation(
@@ -47,19 +53,29 @@
     // Validates the prefix of the Client VM DICE chain in the CSR.
     let service_vm_dice_chain =
         dice_artifacts.bcc().ok_or(RequestProcessingError::MissingDiceChain)?;
+    let service_vm_dice_chain =
+        value_to_array(Value::from_slice(service_vm_dice_chain)?, "service_vm_dice_chain")?;
     let client_vm_dice_chain =
-        validate_client_vm_dice_chain_prefix_match(&csr.dice_cert_chain, service_vm_dice_chain)?;
+        value_to_array(Value::from_slice(&csr.dice_cert_chain)?, "client_vm_dice_chain")?;
+    validate_client_vm_dice_chain_prefix_match(&client_vm_dice_chain, &service_vm_dice_chain)?;
     // Validates the signatures in the Client VM DICE chain and extracts the partially decoded
     // DiceChainEntryPayloads.
     let client_vm_dice_chain =
         ClientVmDiceChain::validate_signatures_and_parse_dice_chain(client_vm_dice_chain)?;
 
+    // The last entry in the service VM DICE chain describes the service VM, which should
+    // be signed with the same key as the kernel image.
+    let service_vm_entry = service_vm_dice_chain.last().unwrap();
+    validate_kernel_authority_hash(client_vm_dice_chain.microdroid_kernel(), service_vm_entry)?;
+    validate_kernel_code_hash(&client_vm_dice_chain)?;
+
     // AAD is empty as defined in service_vm/comm/client_vm_csr.cddl.
     let aad = &[];
 
     // Verifies the first signature with the leaf private key in the DICE chain.
-    // TODO(b/310931749): Verify the first signature with CDI_Leaf_Pub of
-    // the DICE chain in `cose_sign`.
+    cose_sign.verify_signature(DICE_CDI_LEAF_SIGNATURE_INDEX, aad, |signature, message| {
+        client_vm_dice_chain.microdroid_payload().subject_public_key.verify(signature, message)
+    })?;
 
     // Verifies the second signature with the public key in the CSR payload.
     let ec_public_key = EcKey::from_cose_public_key_slice(&csr_payload.public_key)?;
@@ -121,3 +137,60 @@
     let digest = sha256(message)?;
     key.ecdsa_sign(&digest)
 }
+
+/// Validates that the authority hash of the Microdroid kernel in the Client VM DICE chain
+/// matches the authority hash of the service VM entry in the service VM DICE chain, because
+/// the Microdroid kernel is signed with the same key as the one used for the service VM.
+fn validate_kernel_authority_hash(
+    kernel: &DiceChainEntryPayload,
+    service_vm_entry: &Value,
+) -> Result<()> {
+    if expected_kernel_authority_hash(service_vm_entry)? == kernel.authority_hash {
+        Ok(())
+    } else {
+        error!("The authority hash of the Microdroid kernel does not match the expected value");
+        Err(RequestProcessingError::InvalidDiceChain)
+    }
+}
+
+/// Validates that the kernel code hash in the Client VM DICE chain matches the code hashes
+/// embedded during the build time.
+fn validate_kernel_code_hash(dice_chain: &ClientVmDiceChain) -> Result<()> {
+    let kernel = dice_chain.microdroid_kernel();
+    if expected_kernel_code_hash_normal()? == kernel.code_hash {
+        return Ok(());
+    }
+    if expected_kernel_code_hash_debug()? == kernel.code_hash {
+        if dice_chain.all_entries_are_secure() {
+            error!("The Microdroid kernel has debug initrd but the DICE chain is secure");
+            return Err(RequestProcessingError::InvalidDiceChain);
+        }
+        return Ok(());
+    }
+    error!("The kernel code hash in the Client VM DICE chain does not match any expected values");
+    Err(RequestProcessingError::InvalidDiceChain)
+}
+
+fn expected_kernel_code_hash_normal() -> bssl_avf::Result<Vec<u8>> {
+    let mut code_hash = [0u8; 64];
+    code_hash[0..32].copy_from_slice(KERNEL_HASH);
+    code_hash[32..].copy_from_slice(INITRD_NORMAL_HASH);
+    Digester::sha512().digest(&code_hash)
+}
+
+fn expected_kernel_code_hash_debug() -> bssl_avf::Result<Vec<u8>> {
+    let mut code_hash = [0u8; 64];
+    code_hash[0..32].copy_from_slice(KERNEL_HASH);
+    code_hash[32..].copy_from_slice(INITRD_DEBUG_HASH);
+    Digester::sha512().digest(&code_hash)
+}
+
+fn expected_kernel_authority_hash(service_vm_entry: &Value) -> Result<[u8; HASH_SIZE]> {
+    let cose_sign1 = CoseSign1::from_cbor_value(service_vm_entry.clone())?;
+    let payload = cose_sign1.payload.ok_or_else(|| {
+        error!("No payload found in the service VM DICE chain entry");
+        RequestProcessingError::InternalError
+    })?;
+    let service_vm = DiceChainEntryPayload::from_slice(&payload)?;
+    Ok(service_vm.authority_hash)
+}
diff --git a/service_vm/requests/src/dice.rs b/service_vm/requests/src/dice.rs
index 557b678..657e482 100644
--- a/service_vm/requests/src/dice.rs
+++ b/service_vm/requests/src/dice.rs
@@ -16,15 +16,19 @@
 
 use alloc::string::String;
 use alloc::vec::Vec;
+use bssl_avf::{ed25519_verify, Digester, EcKey};
 use cbor_util::{
-    cbor_value_type, value_to_array, value_to_byte_array, value_to_bytes, value_to_map,
-    value_to_num, value_to_text,
+    cbor_value_type, get_label_value, get_label_value_as_bytes, value_to_array,
+    value_to_byte_array, value_to_bytes, value_to_map, value_to_num, value_to_text,
 };
 use ciborium::value::Value;
 use core::cell::OnceCell;
 use core::result;
 use coset::{
-    self, iana, AsCborValue, CborSerializable, CoseError, CoseKey, CoseSign1, KeyOperation,
+    self,
+    iana::{self, EnumI64},
+    Algorithm, AsCborValue, CborSerializable, CoseError, CoseKey, CoseSign1, KeyOperation, KeyType,
+    Label,
 };
 use diced_open_dice::{DiceMode, HASH_SIZE};
 use log::error;
@@ -58,7 +62,7 @@
 /// ]
 #[derive(Debug, Clone)]
 pub(crate) struct ClientVmDiceChain {
-    pub(crate) payloads: Vec<DiceChainEntryPayload>,
+    payloads: Vec<DiceChainEntryPayload>,
 }
 
 impl ClientVmDiceChain {
@@ -126,11 +130,11 @@
         Ok(())
     }
 
-    fn microdroid_kernel(&self) -> &DiceChainEntryPayload {
+    pub(crate) fn microdroid_kernel(&self) -> &DiceChainEntryPayload {
         &self.payloads[self.payloads.len() - 2]
     }
 
-    fn microdroid_payload(&self) -> &DiceChainEntryPayload {
+    pub(crate) fn microdroid_payload(&self) -> &DiceChainEntryPayload {
         &self.payloads[self.payloads.len() - 1]
     }
 
@@ -147,15 +151,11 @@
 /// Validates that the `client_vm_dice_chain` matches the `service_vm_dice_chain` up to the pvmfw
 /// entry.
 ///
-/// Returns a CBOR value array of the client VM's DICE chain if the verification succeeds.
+/// Returns `Ok(())` if the verification succeeds.
 pub(crate) fn validate_client_vm_dice_chain_prefix_match(
-    client_vm_dice_chain: &[u8],
-    service_vm_dice_chain: &[u8],
-) -> Result<Vec<Value>> {
-    let client_vm_dice_chain =
-        value_to_array(Value::from_slice(client_vm_dice_chain)?, "client_vm_dice_chain")?;
-    let service_vm_dice_chain =
-        value_to_array(Value::from_slice(service_vm_dice_chain)?, "service_vm_dice_chain")?;
+    client_vm_dice_chain: &[Value],
+    service_vm_dice_chain: &[Value],
+) -> Result<()> {
     if service_vm_dice_chain.len() < 3 {
         // The service VM's DICE chain must contain the root key and at least two other entries
         // that describe:
@@ -180,7 +180,7 @@
         );
         return Err(RequestProcessingError::InvalidDiceChain);
     }
-    Ok(client_vm_dice_chain)
+    Ok(())
 }
 
 #[derive(Debug, Clone)]
@@ -198,21 +198,72 @@
     }
 }
 
+impl PublicKey {
+    /// Verifies the signature of the provided message with the public key.
+    ///
+    /// This function supports the following key/algorithm types as specified in
+    /// hardware/interfaces/security/rkp/aidl/android/hardware/security/keymint/
+    /// generateCertificateRequestV2.cddl:
+    ///
+    /// PubKeyEd25519 / PubKeyECDSA256 / PubKeyECDSA384
+    pub(crate) fn verify(&self, signature: &[u8], message: &[u8]) -> Result<()> {
+        match &self.0.kty {
+            KeyType::Assigned(iana::KeyType::EC2) => {
+                let public_key = EcKey::from_cose_public_key(&self.0)?;
+                let Some(Algorithm::Assigned(alg)) = self.0.alg else {
+                    error!("Invalid algorithm in COSE key {:?}", self.0.alg);
+                    return Err(RequestProcessingError::InvalidDiceChain);
+                };
+                let digester = match alg {
+                    iana::Algorithm::ES256 => Digester::sha256(),
+                    iana::Algorithm::ES384 => Digester::sha384(),
+                    _ => {
+                        error!("Unsupported algorithm in EC2 key: {:?}", alg);
+                        return Err(RequestProcessingError::InvalidDiceChain);
+                    }
+                };
+                let digest = digester.digest(message)?;
+                Ok(public_key.ecdsa_verify(signature, &digest)?)
+            }
+            KeyType::Assigned(iana::KeyType::OKP) => {
+                let curve_type =
+                    get_label_value(&self.0, Label::Int(iana::OkpKeyParameter::Crv.to_i64()))?;
+                if curve_type != &Value::from(iana::EllipticCurve::Ed25519.to_i64()) {
+                    error!("Unsupported curve type in OKP COSE key: {:?}", curve_type);
+                    return Err(RequestProcessingError::OperationUnimplemented);
+                }
+                let x = get_label_value_as_bytes(
+                    &self.0,
+                    Label::Int(iana::OkpKeyParameter::X.to_i64()),
+                )?;
+                let public_key = x.try_into().map_err(|_| {
+                    error!("Invalid ED25519 public key size: {}", x.len());
+                    RequestProcessingError::InvalidDiceChain
+                })?;
+                let signature = signature.try_into().map_err(|_| {
+                    error!("Invalid ED25519 signature size: {}", signature.len());
+                    RequestProcessingError::InvalidDiceChain
+                })?;
+                Ok(ed25519_verify(message, signature, public_key)?)
+            }
+            kty => {
+                error!("Unsupported key type in COSE key: {:?}", kty);
+                Err(RequestProcessingError::OperationUnimplemented)
+            }
+        }
+    }
+}
+
 /// Represents a partially decoded `DiceChainEntryPayload`. The whole payload is defined in:
 ///
 /// hardware/interfaces/security/rkp/aidl/android/hardware/security/keymint/
 /// generateCertificateRequestV2.cddl
 #[derive(Debug, Clone)]
 pub(crate) struct DiceChainEntryPayload {
-    /// TODO(b/310931749): Verify the DICE chain entry using the subject public key.
-    #[allow(dead_code)]
-    subject_public_key: PublicKey,
+    pub(crate) subject_public_key: PublicKey,
     mode: DiceMode,
-    /// TODO(b/271275206): Verify Microdroid kernel authority and code hashes.
-    #[allow(dead_code)]
-    code_hash: [u8; HASH_SIZE],
-    #[allow(dead_code)]
-    authority_hash: [u8; HASH_SIZE],
+    pub(crate) code_hash: [u8; HASH_SIZE],
+    pub(crate) authority_hash: [u8; HASH_SIZE],
     config_descriptor: ConfigDescriptor,
 }
 
@@ -221,51 +272,54 @@
     /// extracts payload from the value.
     fn validate_cose_signature_and_extract_payload(
         value: Value,
-        _authority_public_key: &PublicKey,
+        authority_public_key: &PublicKey,
     ) -> Result<Self> {
         let cose_sign1 = CoseSign1::from_cbor_value(value)?;
-        // TODO(b/310931749): Verify the DICE chain entry using `authority_public_key`.
+        let aad = &[]; // AAD is not used in DICE chain entry.
+        cose_sign1.verify_signature(aad, |signature, message| {
+            authority_public_key.verify(signature, message)
+        })?;
 
         let payload = cose_sign1.payload.ok_or_else(|| {
             error!("No payload found in the DICE chain entry");
             RequestProcessingError::InvalidDiceChain
         })?;
-        let entries = value_to_map(Value::from_slice(&payload)?, "DiceChainEntryPayload")?;
-        build_payload(entries)
+        Self::from_slice(&payload)
     }
-}
 
-fn build_payload(entries: Vec<(Value, Value)>) -> Result<DiceChainEntryPayload> {
-    let mut builder = PayloadBuilder::default();
-    for (key, value) in entries.into_iter() {
-        let key: i64 = value_to_num(key, "DiceChainEntryPayload key")?;
-        match key {
-            SUBJECT_PUBLIC_KEY => {
-                let subject_public_key = value_to_bytes(value, "subject_public_key")?;
-                let subject_public_key = CoseKey::from_slice(&subject_public_key)?.try_into()?;
-                builder.subject_public_key(subject_public_key)?;
+    pub(crate) fn from_slice(data: &[u8]) -> Result<Self> {
+        let entries = value_to_map(Value::from_slice(data)?, "DiceChainEntryPayload")?;
+        let mut builder = PayloadBuilder::default();
+        for (key, value) in entries.into_iter() {
+            let key: i64 = value_to_num(key, "DiceChainEntryPayload key")?;
+            match key {
+                SUBJECT_PUBLIC_KEY => {
+                    let subject_public_key = value_to_bytes(value, "subject_public_key")?;
+                    let subject_public_key =
+                        CoseKey::from_slice(&subject_public_key)?.try_into()?;
+                    builder.subject_public_key(subject_public_key)?;
+                }
+                MODE => builder.mode(to_mode(value)?)?,
+                CODE_HASH => {
+                    let code_hash = value_to_byte_array(value, "DiceChainEntryPayload code_hash")?;
+                    builder.code_hash(code_hash)?;
+                }
+                AUTHORITY_HASH => {
+                    let authority_hash =
+                        value_to_byte_array(value, "DiceChainEntryPayload authority_hash")?;
+                    builder.authority_hash(authority_hash)?;
+                }
+                CONFIG_DESC => {
+                    let config_descriptor = value_to_bytes(value, "config_descriptor")?;
+                    let config_descriptor = ConfigDescriptor::from_slice(&config_descriptor)?;
+                    builder.config_descriptor(config_descriptor)?;
+                }
+                _ => {}
             }
-            MODE => builder.mode(to_mode(value)?)?,
-            CODE_HASH => {
-                let code_hash = value_to_byte_array(value, "DiceChainEntryPayload code_hash")?;
-                builder.code_hash(code_hash)?;
-            }
-            AUTHORITY_HASH => {
-                let authority_hash =
-                    value_to_byte_array(value, "DiceChainEntryPayload authority_hash")?;
-                builder.authority_hash(authority_hash)?;
-            }
-            CONFIG_DESC => {
-                let config_descriptor = value_to_bytes(value, "config_descriptor")?;
-                let config_descriptor = ConfigDescriptor::from_slice(&config_descriptor)?;
-                builder.config_descriptor(config_descriptor)?;
-            }
-            _ => {}
         }
+        builder.build()
     }
-    builder.build()
 }
-
 /// Represents a partially decoded `ConfigurationDescriptor`.
 ///
 /// The whole `ConfigurationDescriptor` is defined in: