test(examples): Instruction Files

src/examples/java/software/amazon/encryption/s3/examples/InstructionFileExample.java

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+package software.amazon.encryption.s3.examples;
+
+import java.security.NoSuchAlgorithmException;
+
+import software.amazon.awssdk.core.ResponseBytes;
+import software.amazon.awssdk.core.sync.RequestBody;
+import software.amazon.awssdk.services.kms.KmsClient;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.model.GetObjectResponse;
+import software.amazon.encryption.s3.S3EncryptionClient;
+import software.amazon.encryption.s3.S3EncryptionClientException;
+import software.amazon.encryption.s3.internal.InstructionFileConfig;
+import software.amazon.encryption.s3.materials.KmsKeyring;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static software.amazon.encryption.s3.utils.S3EncryptionClientTestResources.appendTestSuffix;
+import static software.amazon.encryption.s3.utils.S3EncryptionClientTestResources.deleteObject;
+
+public class InstructionFileExample {
+
+    public static void main(final String[] args) throws NoSuchAlgorithmException {
+        final String bucket = args[0];
+        final String kmsKeyId = args.length > 1 ? args[1] : null;
+
+        if (kmsKeyId != null) {
+            InstructionFileExample.simpleKmsKeyringUseInstructionFile(bucket, kmsKeyId);
+        }
+    }
+    /**
+     * This example demonstrates using Instruction Files.
+     *
+     * @param bucket      The name of the Amazon S3 bucket to perform operations on.
+     * @param kmsKeyId    The KMS key ID used for encryption
+     */
+    public static void simpleKmsKeyringUseInstructionFile(
+        final String bucket,
+        final String kmsKeyId
+    ) {
+        // Set up the S3 object key and content to be encrypted
+        final String objectKey = appendTestSuffix(
+            "kms-instruction-file-test"
+        );
+        final String input =
+            "Testing encryption of instruction file with KMS Keyring";
+
+        // Create a KMS client for key operations
+        KmsClient kmsClient = KmsClient.create();
+
+        // Create the original KMS keyring with the first KMS key
+        KmsKeyring originalKeyring = KmsKeyring
+            .builder()
+            .kmsClient(kmsClient)
+            .wrappingKeyId(kmsKeyId)
+            .build();
+
+        // Create a default S3 client for instruction file operations
+        S3Client wrappedClient = S3Client.create();
+
+        // Create the S3 Encryption Client with instruction file support enabled
+        // The client can perform both putObject and getObject operations using the KMS key
+        ResponseBytes<GetObjectResponse> decryptedObject;
+        try (S3EncryptionClient s3ec = S3EncryptionClient
+            .builderV4()
+            .keyring(originalKeyring)
+            .instructionFileConfig(
+                InstructionFileConfig
+                    .builder()
+                    .instructionFileClient(wrappedClient)
+                    .enableInstructionFilePutObject(true)
+                    .build()
+            ).build()) {
+
+            // Upload both the encrypted object and instruction file to the specified bucket in S3
+            s3ec.putObject(
+                builder -> builder.bucket(bucket).key(objectKey).build(),
+                RequestBody.fromString(input)
+            );
+
+            // Verify that the client can successfully decrypt the object
+            decryptedObject = s3ec.getObjectAsBytes(builder ->
+                builder.bucket(bucket).key(objectKey).build()
+            );
+            // Assert that the decrypted object's content matches the original input
+            assertEquals(input, decryptedObject.asUtf8String());
+
+            // Call deleteObject to delete the object and instruction file
+            // from given S3 Bucket
+            deleteObject(bucket, objectKey, s3ec);
+        }
+    }
+}

src/test/java/software/amazon/encryption/s3/examples/InstructionFileExampleTest.java

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+package software.amazon.encryption.s3.examples;
+
+import org.junit.jupiter.api.Test;
+import software.amazon.encryption.s3.utils.S3EncryptionClientTestResources;
+
+import static org.junit.jupiter.api.Assertions.fail;
+
+public class InstructionFileExampleTest {
+
+    @Test
+    public void testInstructionFileExample() {
+        final String bucket = S3EncryptionClientTestResources.BUCKET;
+        final String kmsKeyId = S3EncryptionClientTestResources.KMS_KEY_ID;
+        try {
+            InstructionFileExample.simpleKmsKeyringUseInstructionFile(bucket, kmsKeyId);
+        } catch (Throwable exception) {
+            exception.printStackTrace();
+            fail("Instruction File Example Test Failed!!", exception);
+        }
+    }
+}

src/test/java/software/amazon/encryption/s3/examples/ReEncryptInstructionFileExampleTest.java

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+package software.amazon.encryption.s3.examples;
+
+import org.junit.jupiter.api.Test;
+import software.amazon.encryption.s3.utils.S3EncryptionClientTestResources;
+
+import static org.junit.jupiter.api.Assertions.fail;
+
+public class ReEncryptInstructionFileExampleTest {
+
+    @Test
+    public void testSimpleAesKeyringReEncryptInstructionFile() {
+        final String bucket = S3EncryptionClientTestResources.BUCKET;
+        try {
+            ReEncryptInstructionFileExample.simpleAesKeyringReEncryptInstructionFile(bucket);
+        } catch (Throwable exception) {
+            exception.printStackTrace();
+            fail("AES Keyring ReEncrypt Instruction File Test Failed!!", exception);
+        }
+    }
+
+    @Test
+    public void testSimpleRsaKeyringReEncryptInstructionFile() {
+        final String bucket = S3EncryptionClientTestResources.BUCKET;
+        try {
+            ReEncryptInstructionFileExample.simpleRsaKeyringReEncryptInstructionFile(bucket);
+        } catch (Throwable exception) {
+            exception.printStackTrace();
+            fail("RSA Keyring ReEncrypt Instruction File Test Failed!!", exception);
+        }
+    }
+
+    @Test
+    public void testSimpleRsaKeyringReEncryptInstructionFileWithCustomSuffix() {
+        final String bucket = S3EncryptionClientTestResources.BUCKET;
+        try {
+            ReEncryptInstructionFileExample.simpleRsaKeyringReEncryptInstructionFileWithCustomSuffix(bucket);
+        } catch (Throwable exception) {
+            exception.printStackTrace();
+            fail("RSA Keyring ReEncrypt Instruction File With Custom Suffix Test Failed!!", exception);
+        }
+    }
+}