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1KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
2        keyGenerator.init(256, new SecureRandom());
3        SecretKey secretKey = keyGenerator.generateKey();
4        String secretKeyString = Base64.getEncoder().encodeToString(secretKey.getEncoded());
5
6        MessageDigest md5 = MessageDigest.getInstance("MD5");
7        md5.update(secretKey.getEncoded());
8        byte[] digest = md5.digest();
9        String md5String = Base64.getEncoder().encodeToString(digest);
10
11        S3Client client = S3Client.builder().region(Region.AP_SOUTHEAST_2).build();
12
13        PutObjectRequest putRequest = PutObjectRequest.builder()
14                .bucket("my-encrypted-bucket-ssec")
15                .key("my-file.png")
16                .sseCustomerAlgorithm("AES256")
17                .sseCustomerKey(secretKeyString)
18                .sseCustomerKeyMD5(md5String)
19                .build();
20        client.putObject(putRequest, Paths.get("my-file.png"));
21
22        GetObjectRequest getRequest = GetObjectRequest.builder()
23                .bucket("my-encrypted-bucket-ssec")
24                .key("my-file.png")
25                .sseCustomerAlgorithm("AES256")
26                .sseCustomerKey(secretKeyString)
27                .sseCustomerKeyMD5(md5String)
28                .build();
29        client.getObject(getRequest, Paths.get("my-file-copy.png"));