Creating a Base64 encoded SHA-256 hash in Java [closed]

Question

We need to read the file contents and convert it into SHA256 and then convert it into Base64.

Any pointer or sample code will suffice , as I am new to this encryption mechanism.

Thanks in advance.

Sounds like you want to do this stackoverflow.com/questions/3103652/… and then this stackoverflow.com/questions/13109588/base64-encoding-in-java — domsson
– domsson, Commented Feb 27, 2017 at 13:15
To convert to SHA256 : stackoverflow.com/questions/5531455/… To convert to Base64 : stackoverflow.com/questions/19743851/… — yalpsid eman
– yalpsid eman, Commented Feb 27, 2017 at 13:27

lbndev · Accepted Answer · 2017-02-27 14:34:34Z

With Java 8 :

public static String fileSha256ToBase64(File file) throws NoSuchAlgorithmException, IOException { byte[] data = Files.readAllBytes(file.toPath()); MessageDigest digester = MessageDigest.getInstance("SHA-256"); digester.update(data); return Base64.getEncoder().encodeToString(digester.digest()); }

BTW : SHA256 is not encryption, it's hashing. Hashing doesn't need a key, encryption does. Encryption can be reversed (using the key), hashing can't. More on Wikipedia : https://en.wikipedia.org/wiki/Hash_function

Florent Bayle · Accepted Answer · 2017-02-27 13:27:28Z

6

You can use MessageDigest to convert to SHA256, and Base64 to convert it to Base64:

public static String encode(final String clearText) throws NoSuchAlgorithmException { return new String( Base64.getEncoder().encode(MessageDigest.getInstance("SHA-256").digest(clearText.getBytes(StandardCharsets.UTF_8)))); }

answered Feb 27, 2017 at 13:27

Florent Bayle

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4 Comments

zaph Over a year ago

Better terminology would be creating a Base64 encoded SHA-256 hash. This does not answer the question: "read the file contents and convert it into SHA256 and then convert it into Base64".

Mayank Tiwary Over a year ago

Hi, Thanks for the response. I am trying to read a file content through Java program excluding the last record of the file.The content of the file, except the last record should be encrypted to Sha256 and later i am changing it to base64 (excluding carriage returns and new line feed). But when I am comparing the value returned from Java and to the online tool (hash.online-convert.com/sha256-generator) for instance , the character length is coming proper but the value is differing. Please suggest does the hashing and encryption values the one generated in Java and Oracle11g differs?

Mayank Tiwary Over a year ago

If required will post the code, as I am not getting the clue.

Mayank Tiwary Over a year ago

Thanks to all ..I have solved the problem .. :)

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