CODEWITHSUNDEEP
java
user3243499
user3243499

Reputation: 3161

SHA1 hashing not working as expected in Java

I am trying to write a small Java code to see how to properly use SHA1.

Following is the code snippet I came up with:

package dummyJavaExp;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Exp1 {

    public static void main(String[] args) throws NoSuchAlgorithmException {
        // TODO Auto-generated method stub
        String str = "Hello there";
        String hashstr = new String(MessageDigest.getInstance("SHA1").digest(str.getBytes()));
        System.out.println("Encrypted value of " + str + " is: " + hashstr);
    }

}

But the above code gives some weird characters as shown in the following output message when I run the above code:

Encrypted value of Hello there is: rlvU>?Þ¢‘4ónjòêì\Î

I thought the encrypted message will be some alphanumeric string.

Am I missing something in my code?

Upvotes: 0

Views: 1229

Answers (1)

EMEM
EMEM

Reputation: 3148

When you use String sample = new String(byte[] bytes) it will create a string with platform's default charset, your digest bytes may not have alphanumeric representation in that charset.

Try to use Base64 or HexString to display digest message.

For example in JAVA8:

You can encode your digest bytes to string with:

String hashstr = Base64.getEncoder().encodeToString(MessageDigest.getInstance("SHA1").digest(str.getBytes("UTF-8")));

You can decode your Base64 with:

byte [] digest = Base64.getDecoder().decode(hashstr);

Upvotes: 2

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