diff --git a/core/java/android/net/vcn/persistablebundleutils/ChildSaProposalUtils.java b/core/java/android/net/vcn/persistablebundleutils/ChildSaProposalUtils.java
new file mode 100644
index 0000000000000..ce5ec75f01a2e
--- /dev/null
+++ b/core/java/android/net/vcn/persistablebundleutils/ChildSaProposalUtils.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+
+package android.net.vcn.persistablebundleutils;
+
+import static com.android.internal.annotations.VisibleForTesting.Visibility;
+
+import android.annotation.NonNull;
+import android.net.ipsec.ike.ChildSaProposal;
+import android.os.PersistableBundle;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.server.vcn.util.PersistableBundleUtils;
+
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * Provides utility methods to convert ChildSaProposal to/from PersistableBundle.
+ *
+ * @hide
+ */
+@VisibleForTesting(visibility = Visibility.PRIVATE)
+public final class ChildSaProposalUtils extends SaProposalUtilsBase {
+    /** Serializes a ChildSaProposal to a PersistableBundle. */
+    @NonNull
+    public static PersistableBundle toPersistableBundle(ChildSaProposal proposal) {
+        return SaProposalUtilsBase.toPersistableBundle(proposal);
+    }
+
+    /** Constructs a ChildSaProposal by deserializing a PersistableBundle. */
+    @NonNull
+    public static ChildSaProposal fromPersistableBundle(@NonNull PersistableBundle in) {
+        Objects.requireNonNull(in, "PersistableBundle was null");
+
+        final ChildSaProposal.Builder builder = new ChildSaProposal.Builder();
+
+        final PersistableBundle encryptionBundle = in.getPersistableBundle(ENCRYPT_ALGO_KEY);
+        Objects.requireNonNull(encryptionBundle, "Encryption algo bundle was null");
+        final List<EncryptionAlgoKeyLenPair> encryptList =
+                PersistableBundleUtils.toList(encryptionBundle, EncryptionAlgoKeyLenPair::new);
+        for (EncryptionAlgoKeyLenPair t : encryptList) {
+            builder.addEncryptionAlgorithm(t.encryptionAlgo, t.keyLen);
+        }
+
+        final int[] integrityAlgoIdArray = in.getIntArray(INTEGRITY_ALGO_KEY);
+        Objects.requireNonNull(integrityAlgoIdArray, "Integrity algo array was null");
+        for (int algo : integrityAlgoIdArray) {
+            builder.addIntegrityAlgorithm(algo);
+        }
+
+        final int[] dhGroupArray = in.getIntArray(DH_GROUP_KEY);
+        Objects.requireNonNull(dhGroupArray, "DH Group array was null");
+        for (int dh : dhGroupArray) {
+            builder.addDhGroup(dh);
+        }
+
+        return builder.build();
+    }
+}
diff --git a/tests/vcn/java/android/net/vcn/persistablebundleutils/SaProposalUtilsTest.java b/tests/vcn/java/android/net/vcn/persistablebundleutils/SaProposalUtilsTest.java
index d3d3a2c5c8a25..e9e8e2444d5f4 100644
--- a/tests/vcn/java/android/net/vcn/persistablebundleutils/SaProposalUtilsTest.java
+++ b/tests/vcn/java/android/net/vcn/persistablebundleutils/SaProposalUtilsTest.java
@@ -18,6 +18,7 @@ package android.net.vcn.persistablebundleutils;
 
 import static org.junit.Assert.assertEquals;
 
+import android.net.ipsec.ike.ChildSaProposal;
 import android.net.ipsec.ike.IkeSaProposal;
 import android.net.ipsec.ike.SaProposal;
 import android.os.PersistableBundle;
@@ -52,4 +53,24 @@ public class SaProposalUtilsTest {
 
         assertEquals(proposal, resultProposal);
     }
+
+    @Test
+    public void testPersistableBundleEncodeDecodeIsLosslessChildProposal() throws Exception {
+        final ChildSaProposal proposal =
+                new ChildSaProposal.Builder()
+                        .addEncryptionAlgorithm(
+                                SaProposal.ENCRYPTION_ALGORITHM_AES_GCM_12,
+                                SaProposal.KEY_LEN_AES_128)
+                        .addEncryptionAlgorithm(
+                                SaProposal.ENCRYPTION_ALGORITHM_AES_GCM_12,
+                                SaProposal.KEY_LEN_AES_192)
+                        .addDhGroup(SaProposal.DH_GROUP_1024_BIT_MODP)
+                        .addDhGroup(SaProposal.DH_GROUP_4096_BIT_MODP)
+                        .build();
+
+        final PersistableBundle bundle = ChildSaProposalUtils.toPersistableBundle(proposal);
+        final SaProposal resultProposal = ChildSaProposalUtils.fromPersistableBundle(bundle);
+
+        assertEquals(proposal, resultProposal);
+    }
 }