Compute Sha256 array using JDK libs [duplicate]

Question

I have some code that computes a hash of a byte array using Guava's Hashing class

private String getShaForFile(byte[] bytes) {
    return Hashing.sha256().hashBytes(bytes).toString();
}

However, a linting tool is complaining that this class is unstable, so I'd like to replace this implementation with one that uses the JDK classes (I'd rather not add a dependency like Bouncy Castle just for the sake of this one method).

Please add the warning/error you get regards the unstable class. — Boris
– Boris, Commented Jan 31, 2020 at 16:18

Govinda Sakhare · Accepted Answer · 2020-01-31 16:29:58Z

0

You can pass algorithm to MessageDigest.instance

 MessageDigest.getInstance(algorithm);

Code would be something around the lines as below:

MessageDigest md = MessageDigest.getInstance("SHA-256");
byte[] hash = md.digest(
  originalString.getBytes(StandardCharsets.UTF_8));
String sha256 = new String(Hex.encode(hash));

You can also use Apache common's API

String sha256hex = DigestUtils.sha256Hex(originalString);

edited Jan 31, 2020 at 16:29

answered Jan 31, 2020 at 16:20

Govinda Sakhare

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